/* $OpenBSD: e_aes.c,v 1.54 2023/09/28 11:29:10 tb Exp $ */
/* ====================================================================
 * Copyright (c) 2001-2011 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 */

#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_AES
#include <openssl/aes.h>
#include <openssl/err.h>
#include <openssl/evp.h>

#include "evp_local.h"
#include "modes_local.h"

typedef struct {
	AES_KEY ks;
	block128_f block;
	union {
		cbc128_f cbc;
		ctr128_f ctr;
	} stream;
} EVP_AES_KEY;

typedef struct {
	AES_KEY ks;		/* AES key schedule to use */
	int key_set;		/* Set if key initialised */
	int iv_set;		/* Set if an iv is set */
	GCM128_CONTEXT gcm;
	unsigned char *iv;	/* Temporary IV store */
	int ivlen;		/* IV length */
	int taglen;
	int iv_gen;		/* It is OK to generate IVs */
	int tls_aad_len;	/* TLS AAD length */
	ctr128_f ctr;
} EVP_AES_GCM_CTX;

typedef struct {
	AES_KEY ks1, ks2;	/* AES key schedules to use */
	XTS128_CONTEXT xts;
	void (*stream)(const unsigned char *in, unsigned char *out,
	    size_t length, const AES_KEY *key1, const AES_KEY *key2,
	    const unsigned char iv[16]);
} EVP_AES_XTS_CTX;

typedef struct {
	AES_KEY ks;		/* AES key schedule to use */
	int key_set;		/* Set if key initialised */
	int iv_set;		/* Set if an iv is set */
	int tag_set;		/* Set if tag is valid */
	int len_set;		/* Set if message length set */
	int L, M;		/* L and M parameters from RFC3610 */
	CCM128_CONTEXT ccm;
	ccm128_f str;
} EVP_AES_CCM_CTX;

#define MAXBITCHUNK	((size_t)1<<(sizeof(size_t)*8-4))

#ifdef VPAES_ASM
int vpaes_set_encrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);
int vpaes_set_decrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);

void vpaes_encrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);
void vpaes_decrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);

void vpaes_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char *ivec, int enc);
#endif
#ifdef BSAES_ASM
void bsaes_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char ivec[16], int enc);
void bsaes_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
    size_t len, const AES_KEY *key, const unsigned char ivec[16]);
void bsaes_xts_encrypt(const unsigned char *inp, unsigned char *out,
    size_t len, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);
void bsaes_xts_decrypt(const unsigned char *inp, unsigned char *out,
    size_t len, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);
#endif
#ifdef AES_CTR_ASM
void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
    size_t blocks, const AES_KEY *key,
    const unsigned char ivec[AES_BLOCK_SIZE]);
#endif
#ifdef AES_XTS_ASM
void AES_xts_encrypt(const char *inp, char *out, size_t len,
    const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]);
void AES_xts_decrypt(const char *inp, char *out, size_t len,
    const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]);
#endif

#if	defined(AES_ASM) &&				(  \
	((defined(__i386)	|| defined(__i386__)	|| \
	  defined(_M_IX86)) && defined(OPENSSL_IA32_SSE2))|| \
	defined(__x86_64)	|| defined(__x86_64__)	|| \
	defined(_M_AMD64)	|| defined(_M_X64)	|| \
	defined(__INTEL__)				)

#include "x86_arch.h"

#ifdef VPAES_ASM
#define VPAES_CAPABLE	(OPENSSL_cpu_caps() & CPUCAP_MASK_SSSE3)
#endif
#ifdef BSAES_ASM
#define BSAES_CAPABLE	VPAES_CAPABLE
#endif
/*
 * AES-NI section
 */
#define	AESNI_CAPABLE	(OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI)

int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);
int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);

void aesni_encrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);
void aesni_decrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);

void aesni_ecb_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, int enc);
void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char *ivec, int enc);

void aesni_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char *ivec);

void aesni_xts_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);

void aesni_xts_decrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);

void aesni_ccm64_encrypt_blocks (const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char ivec[16],
    unsigned char cmac[16]);

void aesni_ccm64_decrypt_blocks (const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char ivec[16],
    unsigned char cmac[16]);

static int
aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	int ret, mode;
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	mode = ctx->cipher->flags & EVP_CIPH_MODE;
	if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) &&
	    !enc) {
		ret = aesni_set_decrypt_key(key, ctx->key_len * 8,
		    ctx->cipher_data);
		dat->block = (block128_f)aesni_decrypt;
		dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
		    (cbc128_f)aesni_cbc_encrypt : NULL;
	} else {
		ret = aesni_set_encrypt_key(key, ctx->key_len * 8,
		    ctx->cipher_data);
		dat->block = (block128_f)aesni_encrypt;
		if (mode == EVP_CIPH_CBC_MODE)
			dat->stream.cbc = (cbc128_f)aesni_cbc_encrypt;
		else if (mode == EVP_CIPH_CTR_MODE)
			dat->stream.ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
		else
			dat->stream.cbc = NULL;
	}

	if (ret < 0) {
		EVPerror(EVP_R_AES_KEY_SETUP_FAILED);
		return 0;
	}

	return 1;
}

static int
aesni_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	aesni_cbc_encrypt(in, out, len, ctx->cipher_data, ctx->iv,
	    ctx->encrypt);

	return 1;
}

static int
aesni_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	size_t	bl = ctx->cipher->block_size;

	if (len < bl)
		return 1;

	aesni_ecb_encrypt(in, out, len, ctx->cipher_data, ctx->encrypt);

	return 1;
}

static int
aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;
	if (key) {
		aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
		CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
		    (block128_f)aesni_encrypt);
		gctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
		/* If we have an iv can set it directly, otherwise use
		 * saved IV.
		 */
		if (iv == NULL && gctx->iv_set)
			iv = gctx->iv;
		if (iv) {
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
			gctx->iv_set = 1;
		}
		gctx->key_set = 1;
	} else {
		/* If key set use IV, otherwise copy */
		if (gctx->key_set)
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
		else
			memcpy(gctx->iv, iv, gctx->ivlen);
		gctx->iv_set = 1;
		gctx->iv_gen = 0;
	}
	return 1;
}

static int
aesni_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;

	if (key) {
		/* key_len is two AES keys */
		if (enc) {
			aesni_set_encrypt_key(key, ctx->key_len * 4,
			    &xctx->ks1);
			xctx->xts.block1 = (block128_f)aesni_encrypt;
			xctx->stream = aesni_xts_encrypt;
		} else {
			aesni_set_decrypt_key(key, ctx->key_len * 4,
			    &xctx->ks1);
			xctx->xts.block1 = (block128_f)aesni_decrypt;
			xctx->stream = aesni_xts_decrypt;
		}

		aesni_set_encrypt_key(key + ctx->key_len / 2,
		    ctx->key_len * 4, &xctx->ks2);
		xctx->xts.block2 = (block128_f)aesni_encrypt;

		xctx->xts.key1 = &xctx->ks1;
	}

	if (iv) {
		xctx->xts.key2 = &xctx->ks2;
		memcpy(ctx->iv, iv, 16);
	}

	return 1;
}

static int
aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;
	if (key) {
		aesni_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
		CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
		    &cctx->ks, (block128_f)aesni_encrypt);
		cctx->str = enc ? (ccm128_f)aesni_ccm64_encrypt_blocks :
		    (ccm128_f)aesni_ccm64_decrypt_blocks;
		cctx->key_set = 1;
	}
	if (iv) {
		memcpy(ctx->iv, iv, 15 - cctx->L);
		cctx->iv_set = 1;
	}
	return 1;
}

#endif

static int
aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	int ret, mode;
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	mode = ctx->cipher->flags & EVP_CIPH_MODE;
	if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) &&
	    !enc)
#ifdef BSAES_CAPABLE
		if (BSAES_CAPABLE && mode == EVP_CIPH_CBC_MODE) {
			ret = AES_set_decrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)AES_decrypt;
			dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt;
		} else
#endif
#ifdef VPAES_CAPABLE
		if (VPAES_CAPABLE) {
			ret = vpaes_set_decrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)vpaes_decrypt;
			dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
			    (cbc128_f)vpaes_cbc_encrypt : NULL;
		} else
#endif
		{
			ret = AES_set_decrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)AES_decrypt;
			dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
			    (cbc128_f)AES_cbc_encrypt : NULL;
		} else
#ifdef BSAES_CAPABLE
		if (BSAES_CAPABLE && mode == EVP_CIPH_CTR_MODE) {
			ret = AES_set_encrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)AES_encrypt;
			dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks;
		} else
#endif
#ifdef VPAES_CAPABLE
		if (VPAES_CAPABLE) {
			ret = vpaes_set_encrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)vpaes_encrypt;
			dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
			    (cbc128_f)vpaes_cbc_encrypt : NULL;
		} else
#endif
		{
			ret = AES_set_encrypt_key(key, ctx->key_len * 8,
			    &dat->ks);
			dat->block = (block128_f)AES_encrypt;
			dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
			    (cbc128_f)AES_cbc_encrypt : NULL;
#ifdef AES_CTR_ASM
			if (mode == EVP_CIPH_CTR_MODE)
				dat->stream.ctr = (ctr128_f)AES_ctr32_encrypt;
#endif
		}

	if (ret < 0) {
		EVPerror(EVP_R_AES_KEY_SETUP_FAILED);
		return 0;
	}

	return 1;
}

static int
aes_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	if (dat->stream.cbc)
		(*dat->stream.cbc)(in, out, len, &dat->ks, ctx->iv,
		    ctx->encrypt);
	else if (ctx->encrypt)
		CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv,
		    dat->block);
	else
		CRYPTO_cbc128_decrypt(in, out, len, &dat->ks, ctx->iv,
		    dat->block);

	return 1;
}

static int
aes_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	size_t	bl = ctx->cipher->block_size;
	size_t	i;
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	if (len < bl)
		return 1;

	for (i = 0, len -= bl; i <= len; i += bl)
		(*dat->block)(in + i, out + i, &dat->ks);

	return 1;
}

static int
aes_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
	    dat->block);
	return 1;
}

static int
aes_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	CRYPTO_cfb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
	    ctx->encrypt, dat->block);
	return 1;
}

static int
aes_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	CRYPTO_cfb128_8_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
	    ctx->encrypt, dat->block);
	return 1;
}

static int
aes_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
		CRYPTO_cfb128_1_encrypt(in, out, len, &dat->ks, ctx->iv,
		    &ctx->num, ctx->encrypt, dat->block);
		return 1;
	}

	while (len >= MAXBITCHUNK) {
		CRYPTO_cfb128_1_encrypt(in, out, MAXBITCHUNK*8, &dat->ks,
		    ctx->iv, &ctx->num, ctx->encrypt, dat->block);
		len -= MAXBITCHUNK;
		in += MAXBITCHUNK;
		out += MAXBITCHUNK;
	}
	if (len)
		CRYPTO_cfb128_1_encrypt(in, out, len*8, &dat->ks,
		    ctx->iv, &ctx->num, ctx->encrypt, dat->block);

	return 1;
}

static int
aes_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	unsigned int num = ctx->num;
	EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

	if (dat->stream.ctr)
		CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks,
		    ctx->iv, ctx->buf, &num, dat->stream.ctr);
	else
		CRYPTO_ctr128_encrypt(in, out, len, &dat->ks,
		    ctx->iv, ctx->buf, &num, dat->block);
	ctx->num = (size_t)num;
	return 1;
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cbc = {
	.nid = NID_aes_128_cbc,
	.block_size = 16,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cbc = {
	.nid = NID_aes_128_cbc,
	.block_size = 16,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cbc(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_cbc : &aes_128_cbc;
#else
	return &aes_128_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ecb = {
	.nid = NID_aes_128_ecb,
	.block_size = 16,
	.key_len = 16,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ecb = {
	.nid = NID_aes_128_ecb,
	.block_size = 16,
	.key_len = 16,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ecb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_ecb : &aes_128_ecb;
#else
	return &aes_128_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ofb = {
	.nid = NID_aes_128_ofb128,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ofb = {
	.nid = NID_aes_128_ofb128,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ofb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_ofb : &aes_128_ofb;
#else
	return &aes_128_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb = {
	.nid = NID_aes_128_cfb128,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb = {
	.nid = NID_aes_128_cfb128,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_cfb : &aes_128_cfb;
#else
	return &aes_128_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb1 = {
	.nid = NID_aes_128_cfb1,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb1 = {
	.nid = NID_aes_128_cfb1,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb1(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_cfb1 : &aes_128_cfb1;
#else
	return &aes_128_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb8 = {
	.nid = NID_aes_128_cfb8,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb8 = {
	.nid = NID_aes_128_cfb8,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb8(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_cfb8 : &aes_128_cfb8;
#else
	return &aes_128_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ctr = {
	.nid = NID_aes_128_ctr,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ctr = {
	.nid = NID_aes_128_ctr,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ctr(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_ctr : &aes_128_ctr;
#else
	return &aes_128_ctr;
#endif
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cbc = {
	.nid = NID_aes_192_cbc,
	.block_size = 16,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cbc = {
	.nid = NID_aes_192_cbc,
	.block_size = 16,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cbc(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_cbc : &aes_192_cbc;
#else
	return &aes_192_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ecb = {
	.nid = NID_aes_192_ecb,
	.block_size = 16,
	.key_len = 24,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ecb = {
	.nid = NID_aes_192_ecb,
	.block_size = 16,
	.key_len = 24,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ecb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_ecb : &aes_192_ecb;
#else
	return &aes_192_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ofb = {
	.nid = NID_aes_192_ofb128,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ofb = {
	.nid = NID_aes_192_ofb128,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ofb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_ofb : &aes_192_ofb;
#else
	return &aes_192_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb = {
	.nid = NID_aes_192_cfb128,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb = {
	.nid = NID_aes_192_cfb128,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_cfb : &aes_192_cfb;
#else
	return &aes_192_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb1 = {
	.nid = NID_aes_192_cfb1,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb1 = {
	.nid = NID_aes_192_cfb1,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb1(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_cfb1 : &aes_192_cfb1;
#else
	return &aes_192_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb8 = {
	.nid = NID_aes_192_cfb8,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb8 = {
	.nid = NID_aes_192_cfb8,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb8(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_cfb8 : &aes_192_cfb8;
#else
	return &aes_192_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ctr = {
	.nid = NID_aes_192_ctr,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ctr = {
	.nid = NID_aes_192_ctr,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ctr(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_ctr : &aes_192_ctr;
#else
	return &aes_192_ctr;
#endif
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cbc = {
	.nid = NID_aes_256_cbc,
	.block_size = 16,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cbc = {
	.nid = NID_aes_256_cbc,
	.block_size = 16,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cbc_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cbc(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_cbc : &aes_256_cbc;
#else
	return &aes_256_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ecb = {
	.nid = NID_aes_256_ecb,
	.block_size = 16,
	.key_len = 32,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aesni_init_key,
	.do_cipher = aesni_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ecb = {
	.nid = NID_aes_256_ecb,
	.block_size = 16,
	.key_len = 32,
	.iv_len = 0,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ecb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ecb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_ecb : &aes_256_ecb;
#else
	return &aes_256_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ofb = {
	.nid = NID_aes_256_ofb128,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ofb = {
	.nid = NID_aes_256_ofb128,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ofb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ofb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_ofb : &aes_256_ofb;
#else
	return &aes_256_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb = {
	.nid = NID_aes_256_cfb128,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb = {
	.nid = NID_aes_256_cfb128,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_cfb : &aes_256_cfb;
#else
	return &aes_256_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb1 = {
	.nid = NID_aes_256_cfb1,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb1 = {
	.nid = NID_aes_256_cfb1,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb1_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb1(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_cfb1 : &aes_256_cfb1;
#else
	return &aes_256_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb8 = {
	.nid = NID_aes_256_cfb8,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb8 = {
	.nid = NID_aes_256_cfb8,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CFB_MODE,
	.init = aes_init_key,
	.do_cipher = aes_cfb8_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb8(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_cfb8 : &aes_256_cfb8;
#else
	return &aes_256_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ctr = {
	.nid = NID_aes_256_ctr,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aesni_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ctr = {
	.nid = NID_aes_256_ctr,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 16,
	.flags = EVP_CIPH_CTR_MODE,
	.init = aes_init_key,
	.do_cipher = aes_ctr_cipher,
	.ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ctr(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_ctr : &aes_256_ctr;
#else
	return &aes_256_ctr;
#endif
}

static int
aes_gcm_cleanup(EVP_CIPHER_CTX *c)
{
	EVP_AES_GCM_CTX *gctx = c->cipher_data;

	if (gctx->iv != c->iv)
		free(gctx->iv);

	explicit_bzero(gctx, sizeof(*gctx));

	return 1;
}

/* increment counter (64-bit int) by 1 */
static void
ctr64_inc(unsigned char *counter)
{
	int n = 8;
	unsigned char  c;

	do {
		--n;
		c = counter[n];
		++c;
		counter[n] = c;
		if (c)
			return;
	} while (n);
}

static int
aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
	EVP_AES_GCM_CTX *gctx = c->cipher_data;

	switch (type) {
	case EVP_CTRL_INIT:
		gctx->key_set = 0;
		gctx->iv_set = 0;
		if (c->cipher->iv_len == 0) {
			EVPerror(EVP_R_INVALID_IV_LENGTH);
			return 0;
		}
		gctx->ivlen = c->cipher->iv_len;
		gctx->iv = c->iv;
		gctx->taglen = -1;
		gctx->iv_gen = 0;
		gctx->tls_aad_len = -1;
		return 1;

	case EVP_CTRL_AEAD_GET_IVLEN:
		*(int *)ptr = gctx->ivlen;
		return 1;

	case EVP_CTRL_AEAD_SET_IVLEN:
		if (arg <= 0)
			return 0;
		/* Allocate memory for IV if needed */
		if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen)) {
			if (gctx->iv != c->iv)
				free(gctx->iv);
			gctx->iv = malloc(arg);
			if (!gctx->iv)
				return 0;
		}
		gctx->ivlen = arg;
		return 1;

	case EVP_CTRL_GCM_SET_TAG:
		if (arg <= 0 || arg > 16 || c->encrypt)
			return 0;
		memcpy(c->buf, ptr, arg);
		gctx->taglen = arg;
		return 1;

	case EVP_CTRL_GCM_GET_TAG:
		if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
			return 0;
		memcpy(ptr, c->buf, arg);
		return 1;

	case EVP_CTRL_GCM_SET_IV_FIXED:
		/* Special case: -1 length restores whole IV */
		if (arg == -1) {
			memcpy(gctx->iv, ptr, gctx->ivlen);
			gctx->iv_gen = 1;
			return 1;
		}
		/* Fixed field must be at least 4 bytes and invocation field
		 * at least 8.
		 */
		if ((arg < 4) || (gctx->ivlen - arg) < 8)
			return 0;
		if (arg)
			memcpy(gctx->iv, ptr, arg);
		if (c->encrypt)
			arc4random_buf(gctx->iv + arg, gctx->ivlen - arg);
		gctx->iv_gen = 1;
		return 1;

	case EVP_CTRL_GCM_IV_GEN:
		if (gctx->iv_gen == 0 || gctx->key_set == 0)
			return 0;
		CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
		if (arg <= 0 || arg > gctx->ivlen)
			arg = gctx->ivlen;
		memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
		/* Invocation field will be at least 8 bytes in size and
		 * so no need to check wrap around or increment more than
		 * last 8 bytes.
		 */
		ctr64_inc(gctx->iv + gctx->ivlen - 8);
		gctx->iv_set = 1;
		return 1;

	case EVP_CTRL_GCM_SET_IV_INV:
		if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt)
			return 0;
		memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
		CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
		gctx->iv_set = 1;
		return 1;

	case EVP_CTRL_AEAD_TLS1_AAD:
		/* Save the AAD for later use */
		if (arg != 13)
			return 0;
		memcpy(c->buf, ptr, arg);
		gctx->tls_aad_len = arg;
		{
			unsigned int len = c->buf[arg - 2] << 8 |
			    c->buf[arg - 1];

			/* Correct length for explicit IV */
			if (len < EVP_GCM_TLS_EXPLICIT_IV_LEN)
				return 0;
			len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;

			/* If decrypting correct for tag too */
			if (!c->encrypt) {
				if (len < EVP_GCM_TLS_TAG_LEN)
					return 0;
				len -= EVP_GCM_TLS_TAG_LEN;
			}
			c->buf[arg - 2] = len >> 8;
			c->buf[arg - 1] = len & 0xff;
		}
		/* Extra padding: tag appended to record */
		return EVP_GCM_TLS_TAG_LEN;

	case EVP_CTRL_COPY:
	    {
		EVP_CIPHER_CTX *out = ptr;
		EVP_AES_GCM_CTX *gctx_out = out->cipher_data;

		if (gctx->gcm.key) {
			if (gctx->gcm.key != &gctx->ks)
				return 0;
			gctx_out->gcm.key = &gctx_out->ks;
		}

		if (gctx->iv == c->iv) {
			gctx_out->iv = out->iv;
		} else {
			if ((gctx_out->iv = calloc(1, gctx->ivlen)) == NULL)
				return 0;
			memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
		}
		return 1;
	    }

	default:
		return -1;

	}
}

static ctr128_f
aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx,
    const unsigned char *key, size_t key_len)
{
#ifdef BSAES_CAPABLE
	if (BSAES_CAPABLE) {
		AES_set_encrypt_key(key, key_len * 8, aes_key);
		CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
		return (ctr128_f)bsaes_ctr32_encrypt_blocks;
	} else
#endif
#ifdef VPAES_CAPABLE
	if (VPAES_CAPABLE) {
		vpaes_set_encrypt_key(key, key_len * 8, aes_key);
		CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt);
		return NULL;
	} else
#endif
		(void)0; /* terminate potentially open 'else' */

	AES_set_encrypt_key(key, key_len * 8, aes_key);
	CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
#ifdef AES_CTR_ASM
	return (ctr128_f)AES_ctr32_encrypt;
#else
	return NULL;
#endif
}

static int
aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;
	if (key) {
		gctx->ctr = aes_gcm_set_key(&gctx->ks, &gctx->gcm,
		    key, ctx->key_len);

		/* If we have an iv can set it directly, otherwise use
		 * saved IV.
		 */
		if (iv == NULL && gctx->iv_set)
			iv = gctx->iv;
		if (iv) {
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
			gctx->iv_set = 1;
		}
		gctx->key_set = 1;
	} else {
		/* If key set use IV, otherwise copy */
		if (gctx->key_set)
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
		else
			memcpy(gctx->iv, iv, gctx->ivlen);
		gctx->iv_set = 1;
		gctx->iv_gen = 0;
	}
	return 1;
}

/* Handle TLS GCM packet format. This consists of the last portion of the IV
 * followed by the payload and finally the tag. On encrypt generate IV,
 * encrypt payload and write the tag. On verify retrieve IV, decrypt payload
 * and verify tag.
 */

static int
aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	int rv = -1;

	/* Encrypt/decrypt must be performed in place */
	if (out != in ||
	    len < (EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN))
		return -1;

	/* Set IV from start of buffer or generate IV and write to start
	 * of buffer.
	 */
	if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ?
	    EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV,
	    EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
		goto err;

	/* Use saved AAD */
	if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len))
		goto err;

	/* Fix buffer and length to point to payload */
	in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
	out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
	len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
	if (ctx->encrypt) {
		/* Encrypt payload */
		if (gctx->ctr) {
			if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in, out,
			    len, gctx->ctr))
				goto err;
		} else {
			if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
				goto err;
		}
		out += len;

		/* Finally write tag */
		CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN);
		rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
	} else {
		/* Decrypt */
		if (gctx->ctr) {
			if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in, out,
			    len, gctx->ctr))
				goto err;
		} else {
			if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
				goto err;
		}
		/* Retrieve tag */
		CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, EVP_GCM_TLS_TAG_LEN);

		/* If tag mismatch wipe buffer */
		if (memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN)) {
			explicit_bzero(out, len);
			goto err;
		}
		rv = len;
	}

err:
	gctx->iv_set = 0;
	gctx->tls_aad_len = -1;
	return rv;
}

static int
aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

	/* If not set up, return error */
	if (!gctx->key_set)
		return -1;

	if (gctx->tls_aad_len >= 0)
		return aes_gcm_tls_cipher(ctx, out, in, len);

	if (!gctx->iv_set)
		return -1;

	if (in) {
		if (out == NULL) {
			if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
				return -1;
		} else if (ctx->encrypt) {
			if (gctx->ctr) {
				if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm,
				    in, out, len, gctx->ctr))
					return -1;
			} else {
				if (CRYPTO_gcm128_encrypt(&gctx->gcm,
				    in, out, len))
					return -1;
			}
		} else {
			if (gctx->ctr) {
				if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm,
				    in, out, len, gctx->ctr))
					return -1;
			} else {
				if (CRYPTO_gcm128_decrypt(&gctx->gcm,
				    in, out, len))
					return -1;
			}
		}
		return len;
	} else {
		if (!ctx->encrypt) {
			if (gctx->taglen < 0)
				return -1;
			if (CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf,
			    gctx->taglen) != 0)
				return -1;
			gctx->iv_set = 0;
			return 0;
		}
		CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
		gctx->taglen = 16;

		/* Don't reuse the IV */
		gctx->iv_set = 0;
		return 0;
	}

}

#define CUSTOM_FLAGS \
    ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \
      EVP_CIPH_FLAG_CUSTOM_IV_LENGTH | \
      EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_ALWAYS_CALL_INIT | \
      EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY )


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_gcm = {
	.nid = NID_aes_128_gcm,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aesni_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_128_gcm = {
	.nid = NID_aes_128_gcm,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aes_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_gcm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_gcm : &aes_128_gcm;
#else
	return &aes_128_gcm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_gcm = {
	.nid = NID_aes_192_gcm,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aesni_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_192_gcm = {
	.nid = NID_aes_192_gcm,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aes_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_192_gcm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_gcm : &aes_192_gcm;
#else
	return &aes_192_gcm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_gcm = {
	.nid = NID_aes_256_gcm,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aesni_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_256_gcm = {
	.nid = NID_aes_256_gcm,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 12,
	.flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
	.init = aes_gcm_init_key,
	.do_cipher = aes_gcm_cipher,
	.cleanup = aes_gcm_cleanup,
	.ctx_size = sizeof(EVP_AES_GCM_CTX),
	.ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_gcm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_gcm : &aes_256_gcm;
#else
	return &aes_256_gcm;
#endif
}

static int
aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
	EVP_AES_XTS_CTX *xctx = c->cipher_data;

	switch (type) {
	case EVP_CTRL_INIT:
		/*
		 * key1 and key2 are used as an indicator both key and IV
		 * are set
		 */
		xctx->xts.key1 = NULL;
		xctx->xts.key2 = NULL;
		return 1;

	case EVP_CTRL_COPY:
	    {
		EVP_CIPHER_CTX *out = ptr;
		EVP_AES_XTS_CTX *xctx_out = out->cipher_data;

		if (xctx->xts.key1) {
			if (xctx->xts.key1 != &xctx->ks1)
				return 0;
			xctx_out->xts.key1 = &xctx_out->ks1;
		}
		if (xctx->xts.key2) {
			if (xctx->xts.key2 != &xctx->ks2)
				return 0;
			xctx_out->xts.key2 = &xctx_out->ks2;
		}
		return 1;
	    }
	}
	return -1;
}

static int
aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;

	if (key) do {
#ifdef AES_XTS_ASM
		xctx->stream = enc ? AES_xts_encrypt : AES_xts_decrypt;
#else
		xctx->stream = NULL;
#endif
		/* key_len is two AES keys */
#ifdef BSAES_CAPABLE
		if (BSAES_CAPABLE)
			xctx->stream = enc ? bsaes_xts_encrypt :
			    bsaes_xts_decrypt;
		else
#endif
#ifdef VPAES_CAPABLE
		if (VPAES_CAPABLE) {
			if (enc) {
				vpaes_set_encrypt_key(key, ctx->key_len * 4,
				    &xctx->ks1);
				xctx->xts.block1 = (block128_f)vpaes_encrypt;
			} else {
				vpaes_set_decrypt_key(key, ctx->key_len * 4,
				    &xctx->ks1);
				xctx->xts.block1 = (block128_f)vpaes_decrypt;
			}

			vpaes_set_encrypt_key(key + ctx->key_len / 2,
			    ctx->key_len * 4, &xctx->ks2);
			xctx->xts.block2 = (block128_f)vpaes_encrypt;

			xctx->xts.key1 = &xctx->ks1;
			break;
		} else
#endif
			(void)0;	/* terminate potentially open 'else' */

		if (enc) {
			AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)AES_encrypt;
		} else {
			AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)AES_decrypt;
		}

		AES_set_encrypt_key(key + ctx->key_len / 2,
		    ctx->key_len * 4, &xctx->ks2);
		xctx->xts.block2 = (block128_f)AES_encrypt;

		xctx->xts.key1 = &xctx->ks1;
	} while (0);

	if (iv) {
		xctx->xts.key2 = &xctx->ks2;
		memcpy(ctx->iv, iv, 16);
	}

	return 1;
}

static int
aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

	if (!xctx->xts.key1 || !xctx->xts.key2)
		return 0;
	if (!out || !in || len < AES_BLOCK_SIZE)
		return 0;

	if (xctx->stream)
		(*xctx->stream)(in, out, len, xctx->xts.key1, xctx->xts.key2,
		    ctx->iv);
	else if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len,
	    ctx->encrypt))
		return 0;
	return 1;
}

#define XTS_FLAGS \
    ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \
      EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY )


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_xts = {
	.nid = NID_aes_128_xts,
	.block_size = 1,
	.key_len = 2 * 16,
	.iv_len = 16,
	.flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
	.init = aesni_xts_init_key,
	.do_cipher = aes_xts_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_XTS_CTX),
	.ctrl = aes_xts_ctrl,
};
#endif

static const EVP_CIPHER aes_128_xts = {
	.nid = NID_aes_128_xts,
	.block_size = 1,
	.key_len = 2 * 16,
	.iv_len = 16,
	.flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
	.init = aes_xts_init_key,
	.do_cipher = aes_xts_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_XTS_CTX),
	.ctrl = aes_xts_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_xts(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_xts : &aes_128_xts;
#else
	return &aes_128_xts;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_xts = {
	.nid = NID_aes_256_xts,
	.block_size = 1,
	.key_len = 2 * 32,
	.iv_len = 16,
	.flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
	.init = aesni_xts_init_key,
	.do_cipher = aes_xts_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_XTS_CTX),
	.ctrl = aes_xts_ctrl,
};
#endif

static const EVP_CIPHER aes_256_xts = {
	.nid = NID_aes_256_xts,
	.block_size = 1,
	.key_len = 2 * 32,
	.iv_len = 16,
	.flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
	.init = aes_xts_init_key,
	.do_cipher = aes_xts_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_XTS_CTX),
	.ctrl = aes_xts_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_xts(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_xts : &aes_256_xts;
#else
	return &aes_256_xts;
#endif
}

static int
aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
	EVP_AES_CCM_CTX *cctx = c->cipher_data;

	switch (type) {
	case EVP_CTRL_INIT:
		cctx->key_set = 0;
		cctx->iv_set = 0;
		cctx->L = 8;
		cctx->M = 12;
		cctx->tag_set = 0;
		cctx->len_set = 0;
		return 1;

	case EVP_CTRL_AEAD_GET_IVLEN:
		*(int *)ptr = 15 - cctx->L;
		return 1;

	case EVP_CTRL_AEAD_SET_IVLEN:
		arg = 15 - arg;

	case EVP_CTRL_CCM_SET_L:
		if (arg < 2 || arg > 8)
			return 0;
		cctx->L = arg;
		return 1;

	case EVP_CTRL_CCM_SET_TAG:
		if ((arg & 1) || arg < 4 || arg > 16)
			return 0;
		if ((c->encrypt && ptr) || (!c->encrypt && !ptr))
			return 0;
		if (ptr) {
			cctx->tag_set = 1;
			memcpy(c->buf, ptr, arg);
		}
		cctx->M = arg;
		return 1;

	case EVP_CTRL_CCM_GET_TAG:
		if (!c->encrypt || !cctx->tag_set)
			return 0;
		if (!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg))
			return 0;
		cctx->tag_set = 0;
		cctx->iv_set = 0;
		cctx->len_set = 0;
		return 1;

	case EVP_CTRL_COPY:
	    {
		EVP_CIPHER_CTX *out = ptr;
		EVP_AES_CCM_CTX *cctx_out = out->cipher_data;

		if (cctx->ccm.key) {
			if (cctx->ccm.key != &cctx->ks)
				return 0;
			cctx_out->ccm.key = &cctx_out->ks;
		}
		return 1;
	    }

	default:
		return -1;
	}
}

static int
aes_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;

	if (!iv && !key)
		return 1;
	if (key) do {
#ifdef VPAES_CAPABLE
		if (VPAES_CAPABLE) {
			vpaes_set_encrypt_key(key, ctx->key_len*8, &cctx->ks);
			CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
			    &cctx->ks, (block128_f)vpaes_encrypt);
			cctx->str = NULL;
			cctx->key_set = 1;
			break;
		}
#endif
		AES_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
		CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
		    &cctx->ks, (block128_f)AES_encrypt);
		cctx->str = NULL;
		cctx->key_set = 1;
	} while (0);
	if (iv) {
		memcpy(ctx->iv, iv, 15 - cctx->L);
		cctx->iv_set = 1;
	}
	return 1;
}

static int
aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
	CCM128_CONTEXT *ccm = &cctx->ccm;

	/* If not set up, return error */
	if (!cctx->iv_set && !cctx->key_set)
		return -1;
	if (!ctx->encrypt && !cctx->tag_set)
		return -1;

	if (!out) {
		if (!in) {
			if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,
			    len))
				return -1;
			cctx->len_set = 1;
			return len;
		}
		/* If have AAD need message length */
		if (!cctx->len_set && len)
			return -1;
		CRYPTO_ccm128_aad(ccm, in, len);
		return len;
	}
	/* EVP_*Final() doesn't return any data */
	if (!in)
		return 0;
	/* If not set length yet do it */
	if (!cctx->len_set) {
		if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
			return -1;
		cctx->len_set = 1;
	}
	if (ctx->encrypt) {
		if (cctx->str ? CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len,
		    cctx->str) : CRYPTO_ccm128_encrypt(ccm, in, out, len))
			return -1;
		cctx->tag_set = 1;
		return len;
	} else {
		int rv = -1;
		if (cctx->str ? !CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len,
		    cctx->str) : !CRYPTO_ccm128_decrypt(ccm, in, out, len)) {
			unsigned char tag[16];
			if (CRYPTO_ccm128_tag(ccm, tag, cctx->M)) {
				if (!memcmp(tag, ctx->buf, cctx->M))
					rv = len;
			}
		}
		if (rv == -1)
			explicit_bzero(out, len);
		cctx->iv_set = 0;
		cctx->tag_set = 0;
		cctx->len_set = 0;
		return rv;
	}

}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ccm = {
	.nid = NID_aes_128_ccm,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aesni_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_128_ccm = {
	.nid = NID_aes_128_ccm,
	.block_size = 1,
	.key_len = 16,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aes_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_ccm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_128_ccm : &aes_128_ccm;
#else
	return &aes_128_ccm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ccm = {
	.nid = NID_aes_192_ccm,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aesni_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_192_ccm = {
	.nid = NID_aes_192_ccm,
	.block_size = 1,
	.key_len = 24,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aes_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_192_ccm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_192_ccm : &aes_192_ccm;
#else
	return &aes_192_ccm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ccm = {
	.nid = NID_aes_256_ccm,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aesni_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_256_ccm = {
	.nid = NID_aes_256_ccm,
	.block_size = 1,
	.key_len = 32,
	.iv_len = 12,
	.flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
	.init = aes_ccm_init_key,
	.do_cipher = aes_ccm_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_CCM_CTX),
	.ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_ccm(void)
{
#ifdef AESNI_CAPABLE
	return AESNI_CAPABLE ? &aesni_256_ccm : &aes_256_ccm;
#else
	return &aes_256_ccm;
#endif
}

#define EVP_AEAD_AES_GCM_TAG_LEN 16

struct aead_aes_gcm_ctx {
	union {
		double align;
		AES_KEY ks;
	} ks;
	GCM128_CONTEXT gcm;
	ctr128_f ctr;
	unsigned char tag_len;
};

static int
aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len,
    size_t tag_len)
{
	struct aead_aes_gcm_ctx *gcm_ctx;
	const size_t key_bits = key_len * 8;

	/* EVP_AEAD_CTX_init should catch this. */
	if (key_bits != 128 && key_bits != 256) {
		EVPerror(EVP_R_BAD_KEY_LENGTH);
		return 0;
	}

	if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH)
		tag_len = EVP_AEAD_AES_GCM_TAG_LEN;

	if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) {
		EVPerror(EVP_R_TAG_TOO_LARGE);
		return 0;
	}

	if ((gcm_ctx = calloc(1, sizeof(struct aead_aes_gcm_ctx))) == NULL)
		return 0;

#ifdef AESNI_CAPABLE
	if (AESNI_CAPABLE) {
		aesni_set_encrypt_key(key, key_bits, &gcm_ctx->ks.ks);
		CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks,
		    (block128_f)aesni_encrypt);
		gcm_ctx->ctr = (ctr128_f) aesni_ctr32_encrypt_blocks;
	} else
#endif
	{
		gcm_ctx->ctr = aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm,
		    key, key_len);
	}
	gcm_ctx->tag_len = tag_len;
	ctx->aead_state = gcm_ctx;

	return 1;
}

static void
aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx)
{
	struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;

	freezero(gcm_ctx, sizeof(*gcm_ctx));
}

static int
aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
	const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
	GCM128_CONTEXT gcm;
	size_t bulk = 0;

	if (max_out_len < in_len + gcm_ctx->tag_len) {
		EVPerror(EVP_R_BUFFER_TOO_SMALL);
		return 0;
	}

	memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));

	if (nonce_len == 0) {
		EVPerror(EVP_R_INVALID_IV_LENGTH);
		return 0;
	}
	CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len);

	if (ad_len > 0 && CRYPTO_gcm128_aad(&gcm, ad, ad_len))
		return 0;

	if (gcm_ctx->ctr) {
		if (CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk,
		    in_len - bulk, gcm_ctx->ctr))
			return 0;
	} else {
		if (CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk,
		    in_len - bulk))
			return 0;
	}

	CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len);
	*out_len = in_len + gcm_ctx->tag_len;

	return 1;
}

static int
aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
	const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
	unsigned char tag[EVP_AEAD_AES_GCM_TAG_LEN];
	GCM128_CONTEXT gcm;
	size_t plaintext_len;
	size_t bulk = 0;

	if (in_len < gcm_ctx->tag_len) {
		EVPerror(EVP_R_BAD_DECRYPT);
		return 0;
	}

	plaintext_len = in_len - gcm_ctx->tag_len;

	if (max_out_len < plaintext_len) {
		EVPerror(EVP_R_BUFFER_TOO_SMALL);
		return 0;
	}

	memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));

	if (nonce_len == 0) {
		EVPerror(EVP_R_INVALID_IV_LENGTH);
		return 0;
	}
	CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len);

	if (CRYPTO_gcm128_aad(&gcm, ad, ad_len))
		return 0;

	if (gcm_ctx->ctr) {
		if (CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk,
		    in_len - bulk - gcm_ctx->tag_len, gcm_ctx->ctr))
			return 0;
	} else {
		if (CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk,
		    in_len - bulk - gcm_ctx->tag_len))
			return 0;
	}

	CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len);
	if (timingsafe_memcmp(tag, in + plaintext_len, gcm_ctx->tag_len) != 0) {
		EVPerror(EVP_R_BAD_DECRYPT);
		return 0;
	}

	*out_len = plaintext_len;

	return 1;
}

static const EVP_AEAD aead_aes_128_gcm = {
	.key_len = 16,
	.nonce_len = 12,
	.overhead = EVP_AEAD_AES_GCM_TAG_LEN,
	.max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN,

	.init = aead_aes_gcm_init,
	.cleanup = aead_aes_gcm_cleanup,
	.seal = aead_aes_gcm_seal,
	.open = aead_aes_gcm_open,
};

static const EVP_AEAD aead_aes_256_gcm = {
	.key_len = 32,
	.nonce_len = 12,
	.overhead = EVP_AEAD_AES_GCM_TAG_LEN,
	.max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN,

	.init = aead_aes_gcm_init,
	.cleanup = aead_aes_gcm_cleanup,
	.seal = aead_aes_gcm_seal,
	.open = aead_aes_gcm_open,
};

const EVP_AEAD *
EVP_aead_aes_128_gcm(void)
{
	return &aead_aes_128_gcm;
}

const EVP_AEAD *
EVP_aead_aes_256_gcm(void)
{
	return &aead_aes_256_gcm;
}

typedef struct {
	union {
		double align;
		AES_KEY ks;
	} ks;
	unsigned char *iv;
} EVP_AES_WRAP_CTX;

static int
aes_wrap_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
	EVP_AES_WRAP_CTX *wctx = (EVP_AES_WRAP_CTX *)ctx->cipher_data;

	if (iv == NULL && key == NULL)
		return 1;

	if (key != NULL) {
		if (ctx->encrypt)
			AES_set_encrypt_key(key, 8 * ctx->key_len,
			    &wctx->ks.ks);
		else
			AES_set_decrypt_key(key, 8 * ctx->key_len,
			    &wctx->ks.ks);

		if (iv == NULL)
			wctx->iv = NULL;
	}

	if (iv != NULL) {
		memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
		wctx->iv = ctx->iv;
	}

	return 1;
}

static int
aes_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inlen)
{
	EVP_AES_WRAP_CTX *wctx = ctx->cipher_data;
	int ret;

	if (in == NULL)
		return 0;

	if (inlen % 8 != 0)
		return -1;
	if (ctx->encrypt && inlen < 8)
		return -1;
	if (!ctx->encrypt && inlen < 16)
		return -1;
	if (inlen > INT_MAX)
		return -1;

	if (out == NULL) {
		if (ctx->encrypt)
			return inlen + 8;
		else
			return inlen - 8;
	}

	if (ctx->encrypt)
		ret = AES_wrap_key(&wctx->ks.ks, wctx->iv, out, in,
		    (unsigned int)inlen);
	else
		ret = AES_unwrap_key(&wctx->ks.ks, wctx->iv, out, in,
		    (unsigned int)inlen);

	return ret != 0 ? ret : -1;
}

static int
aes_wrap_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
	EVP_AES_WRAP_CTX *wctx = c->cipher_data;

	switch (type) {
	case EVP_CTRL_COPY:
	    {
		EVP_CIPHER_CTX *out = ptr;
		EVP_AES_WRAP_CTX *wctx_out = out->cipher_data;

		if (wctx->iv != NULL) {
			if (c->iv != wctx->iv)
				return 0;

			wctx_out->iv = out->iv;
		}

		return 1;
	    }
	}

	return -1;
}

#define WRAP_FLAGS \
    ( EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | \
      EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_FLAG_DEFAULT_ASN1 | \
      EVP_CIPH_CUSTOM_COPY )

static const EVP_CIPHER aes_128_wrap = {
	.nid = NID_id_aes128_wrap,
	.block_size = 8,
	.key_len = 16,
	.iv_len = 8,
	.flags = WRAP_FLAGS,
	.init = aes_wrap_init_key,
	.do_cipher = aes_wrap_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_WRAP_CTX),
	.set_asn1_parameters = NULL,
	.get_asn1_parameters = NULL,
	.ctrl = aes_wrap_ctrl,
	.app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_128_wrap(void)
{
	return &aes_128_wrap;
}

static const EVP_CIPHER aes_192_wrap = {
	.nid = NID_id_aes192_wrap,
	.block_size = 8,
	.key_len = 24,
	.iv_len = 8,
	.flags = WRAP_FLAGS,
	.init = aes_wrap_init_key,
	.do_cipher = aes_wrap_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_WRAP_CTX),
	.set_asn1_parameters = NULL,
	.get_asn1_parameters = NULL,
	.ctrl = aes_wrap_ctrl,
	.app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_192_wrap(void)
{
	return &aes_192_wrap;
}

static const EVP_CIPHER aes_256_wrap = {
	.nid = NID_id_aes256_wrap,
	.block_size = 8,
	.key_len = 32,
	.iv_len = 8,
	.flags = WRAP_FLAGS,
	.init = aes_wrap_init_key,
	.do_cipher = aes_wrap_cipher,
	.cleanup = NULL,
	.ctx_size = sizeof(EVP_AES_WRAP_CTX),
	.set_asn1_parameters = NULL,
	.get_asn1_parameters = NULL,
	.ctrl = aes_wrap_ctrl,
	.app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_256_wrap(void)
{
	return &aes_256_wrap;
}

#endif
