/* $OpenBSD: evp_lib.c,v 1.28 2023/09/28 11:29:10 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>

#include "asn1_local.h"
#include "evp_local.h"

int
EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
	int ret;

	if (c->cipher->set_asn1_parameters != NULL)
		ret = c->cipher->set_asn1_parameters(c, type);
	else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)
		ret = EVP_CIPHER_set_asn1_iv(c, type);
	else
		ret = -1;
	return (ret);
}

int
EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
	int ret;

	if (c->cipher->get_asn1_parameters != NULL)
		ret = c->cipher->get_asn1_parameters(c, type);
	else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)
		ret = EVP_CIPHER_get_asn1_iv(c, type);
	else
		ret = -1;
	return (ret);
}

int
EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
	int i = 0;
	unsigned int l;

	if (type != NULL) {
		l = EVP_CIPHER_CTX_iv_length(c);
		if (l > sizeof(c->iv)) {
			EVPerror(EVP_R_IV_TOO_LARGE);
			return 0;
		}
		i = ASN1_TYPE_get_octetstring(type, c->oiv, l);
		if (i != (int)l)
			return (-1);
		else if (i > 0)
			memcpy(c->iv, c->oiv, l);
	}
	return (i);
}

int
EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
{
	int i = 0;
	unsigned int j;

	if (type != NULL) {
		j = EVP_CIPHER_CTX_iv_length(c);
		if (j > sizeof(c->iv)) {
			EVPerror(EVP_R_IV_TOO_LARGE);
			return 0;
		}
		i = ASN1_TYPE_set_octetstring(type, c->oiv, j);
	}
	return (i);
}

/* Convert the various cipher NIDs and dummies to a proper OID NID */
int
EVP_CIPHER_type(const EVP_CIPHER *ctx)
{
	int nid;
	ASN1_OBJECT *otmp;
	nid = EVP_CIPHER_nid(ctx);

	switch (nid) {
	case NID_rc2_cbc:
	case NID_rc2_64_cbc:
	case NID_rc2_40_cbc:
		return NID_rc2_cbc;

	case NID_rc4:
	case NID_rc4_40:
		return NID_rc4;

	case NID_aes_128_cfb128:
	case NID_aes_128_cfb8:
	case NID_aes_128_cfb1:
		return NID_aes_128_cfb128;

	case NID_aes_192_cfb128:
	case NID_aes_192_cfb8:
	case NID_aes_192_cfb1:
		return NID_aes_192_cfb128;

	case NID_aes_256_cfb128:
	case NID_aes_256_cfb8:
	case NID_aes_256_cfb1:
		return NID_aes_256_cfb128;

	case NID_des_cfb64:
	case NID_des_cfb8:
	case NID_des_cfb1:
		return NID_des_cfb64;

	case NID_des_ede3_cfb64:
	case NID_des_ede3_cfb8:
	case NID_des_ede3_cfb1:
		return NID_des_cfb64;

	default:
		/* Check it has an OID and it is valid */
		otmp = OBJ_nid2obj(nid);
		if (!otmp || !otmp->data)
			nid = NID_undef;
		ASN1_OBJECT_free(otmp);
		return nid;
	}
}

int
EVP_CIPHER_block_size(const EVP_CIPHER *e)
{
	return e->block_size;
}

int
EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)
{
	return ctx->cipher->block_size;
}

int
EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,
    unsigned int inl)
{
	return ctx->cipher->do_cipher(ctx, out, in, inl);
}

const EVP_CIPHER *
EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)
{
	return ctx->cipher;
}

int
EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)
{
	return ctx->encrypt;
}

unsigned long
EVP_CIPHER_flags(const EVP_CIPHER *cipher)
{
	return cipher->flags;
}

unsigned long
EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
{
	return ctx->cipher->flags;
}

void *
EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)
{
	return ctx->app_data;
}

void
EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)
{
	ctx->app_data = data;
}

void *
EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)
{
	return ctx->cipher_data;
}

void *
EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)
{
	void *old_cipher_data;

	old_cipher_data = ctx->cipher_data;
	ctx->cipher_data = cipher_data;

	return old_cipher_data;
}

int
EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)
{
	return cipher->iv_len;
}

int
EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
{
	int iv_length = 0;

	if ((ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_IV_LENGTH) == 0)
		return ctx->cipher->iv_len;

	/*
	 * XXX - sanity would suggest to pass the size of the pointer along,
	 * but unfortunately we have to match the other crowd.
	 */
	if (EVP_CIPHER_CTX_ctrl((EVP_CIPHER_CTX *)ctx, EVP_CTRL_GET_IVLEN, 0,
	    &iv_length) != 1)
		return -1;

	return iv_length;
}

unsigned char *
EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)
{
	return ctx->buf;
}

int
EVP_CIPHER_key_length(const EVP_CIPHER *cipher)
{
	return cipher->key_len;
}

int
EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)
{
	return ctx->key_len;
}

int
EVP_CIPHER_nid(const EVP_CIPHER *cipher)
{
	return cipher->nid;
}

int
EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
{
	return ctx->cipher->nid;
}

int
EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx, unsigned char *iv, size_t len)
{
	if (ctx == NULL || len != EVP_CIPHER_CTX_iv_length(ctx))
		return 0;
	if (len > EVP_MAX_IV_LENGTH)
		return 0; /* sanity check; shouldn't happen */
	/*
	 * Skip the memcpy entirely when the requested IV length is zero,
	 * since the iv pointer may be NULL or invalid.
	 */
	if (len != 0) {
		if (iv == NULL)
			return 0;
		memcpy(iv, ctx->iv, len);
	}
	return 1;
}

int
EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx, const unsigned char *iv, size_t len)
{
	if (ctx == NULL || len != EVP_CIPHER_CTX_iv_length(ctx))
		return 0;
	if (len > EVP_MAX_IV_LENGTH)
		return 0; /* sanity check; shouldn't happen */
	/*
	 * Skip the memcpy entirely when the requested IV length is zero,
	 * since the iv pointer may be NULL or invalid.
	 */
	if (len != 0) {
		if (iv == NULL)
			return 0;
		memcpy(ctx->iv, iv, len);
	}
	return 1;
}

int
EVP_MD_block_size(const EVP_MD *md)
{
	return md->block_size;
}

int
EVP_MD_type(const EVP_MD *md)
{
	return md->type;
}

int
EVP_MD_pkey_type(const EVP_MD *md)
{
	return md->pkey_type;
}

int
EVP_MD_size(const EVP_MD *md)
{
	if (!md) {
		EVPerror(EVP_R_MESSAGE_DIGEST_IS_NULL);
		return -1;
	}
	return md->md_size;
}

unsigned long
EVP_MD_flags(const EVP_MD *md)
{
	return md->flags;
}

EVP_MD *
EVP_MD_meth_new(int md_type, int pkey_type)
{
	EVP_MD *md;

	if ((md = calloc(1, sizeof(*md))) == NULL)
		return NULL;

	md->type = md_type;
	md->pkey_type = pkey_type;

	return md;
}

EVP_MD *
EVP_MD_meth_dup(const EVP_MD *md)
{
	EVP_MD *to;

	if ((to = EVP_MD_meth_new(md->type, md->pkey_type)) == NULL)
		return NULL;

	memcpy(to, md, sizeof(*to));

	return to;
}

void
EVP_MD_meth_free(EVP_MD *md)
{
	freezero(md, sizeof(*md));
}

int
EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)
{
	md->block_size = blocksize;
	return 1;
}

int
EVP_MD_meth_set_result_size(EVP_MD *md, int result_size)
{
	md->md_size = result_size;
	return 1;
}

int
EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)
{
	md->ctx_size = datasize;
	return 1;
}

int
EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)
{
	md->flags = flags;
	return 1;
}

int
EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))
{
	md->init = init;
	return 1;
}

int
EVP_MD_meth_set_update(EVP_MD *md,
    int (*update)(EVP_MD_CTX *ctx, const void *data, size_t count))
{
	md->update = update;
	return 1;
}

int
EVP_MD_meth_set_final(EVP_MD *md,
    int (*final)(EVP_MD_CTX *ctx, unsigned char *md))
{
	md->final = final;
	return 1;
}

int
EVP_MD_meth_set_copy(EVP_MD *md,
    int (*copy)(EVP_MD_CTX *to, const EVP_MD_CTX *from))
{
	md->copy = copy;
	return 1;
}

int
EVP_MD_meth_set_cleanup(EVP_MD *md,
    int (*cleanup)(EVP_MD_CTX *ctx))
{
	md->cleanup = cleanup;
	return 1;
}

int
EVP_MD_meth_set_ctrl(EVP_MD *md,
    int (*ctrl)(EVP_MD_CTX *ctx, int cmd, int p1, void *p2))
{
	md->md_ctrl = ctrl;
	return 1;
}

const EVP_MD *
EVP_MD_CTX_md(const EVP_MD_CTX *ctx)
{
	if (!ctx)
		return NULL;
	return ctx->digest;
}

void *
EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)
{
	return ctx->md_data;
}

EVP_PKEY_CTX *
EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)
{
	return ctx->pctx;
}

void
EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)
{
	if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) {
		EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
	} else {
		EVP_PKEY_CTX_free(ctx->pctx);
	}

	ctx->pctx = pctx;

	if (pctx != NULL) {
		/*
		 * For unclear reasons it was decided that the caller keeps
		 * ownership of pctx. So a flag was invented to make sure we
		 * don't free it in EVP_MD_CTX_cleanup(). We also need to
		 * unset it in EVP_MD_CTX_copy_ex(). Fortunately, the flag
		 * isn't public...
		 */
		EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
	}
}

void
EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)
{
	ctx->flags |= flags;
}

void
EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)
{
	ctx->flags &= ~flags;
}

int
EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)
{
	return (ctx->flags & flags);
}

void
EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)
{
	ctx->flags |= flags;
}

void
EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)
{
	ctx->flags &= ~flags;
}

int
EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)
{
	return (ctx->flags & flags);
}
