/*
 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/* Dispatch functions for RC5 cipher modes ecb, cbc, ofb, cfb */

/*
 * RC5 low level APIs are deprecated for public use, but still ok for internal
 * use.
 */
#include "internal/deprecated.h"

#include <openssl/proverr.h>
#include "cipher_rc5.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"

#define RC5_FLAGS PROV_CIPHER_FLAG_VARIABLE_LENGTH

static OSSL_FUNC_cipher_encrypt_init_fn rc5_einit;
static OSSL_FUNC_cipher_decrypt_init_fn rc5_dinit;
static OSSL_FUNC_cipher_freectx_fn rc5_freectx;
static OSSL_FUNC_cipher_dupctx_fn rc5_dupctx;
OSSL_FUNC_cipher_gettable_ctx_params_fn rc5_gettable_ctx_params;
OSSL_FUNC_cipher_settable_ctx_params_fn rc5_settable_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn rc5_set_ctx_params;

static void rc5_freectx(void *vctx)
{
    PROV_RC5_CTX *ctx = (PROV_RC5_CTX *)vctx;

    ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
    OPENSSL_clear_free(ctx, sizeof(*ctx));
}

static void *rc5_dupctx(void *ctx)
{
    PROV_RC5_CTX *in = (PROV_RC5_CTX *)ctx;
    PROV_RC5_CTX *ret;

    if (!ossl_prov_is_running())
        return NULL;

    ret = OPENSSL_malloc(sizeof(*ret));
    if (ret == NULL) {
        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    *ret = *in;

    return ret;
}

static int rc5_einit(void *ctx, const unsigned char *key, size_t keylen,
    const unsigned char *iv, size_t ivlen,
    const OSSL_PARAM params[])
{
    if (!ossl_cipher_generic_einit(ctx, key, keylen, iv, ivlen, NULL))
        return 0;
    return rc5_set_ctx_params(ctx, params);
}

static int rc5_dinit(void *ctx, const unsigned char *key, size_t keylen,
    const unsigned char *iv, size_t ivlen,
    const OSSL_PARAM params[])
{
    if (!ossl_cipher_generic_dinit(ctx, key, keylen, iv, ivlen, NULL))
        return 0;
    return rc5_set_ctx_params(ctx, params);
}

static int rc5_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    PROV_RC5_CTX *ctx = (PROV_RC5_CTX *)vctx;
    const OSSL_PARAM *p;

    if (params == NULL)
        return 1;

    if (!ossl_cipher_var_keylen_set_ctx_params(vctx, params))
        return 0;

    p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_ROUNDS);
    if (p != NULL) {
        unsigned int rounds;

        if (!OSSL_PARAM_get_uint(p, &rounds)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
            return 0;
        }
        if (rounds != RC5_8_ROUNDS
            && rounds != RC5_12_ROUNDS
            && rounds != RC5_16_ROUNDS) {
            ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_NUMBER_OF_ROUNDS);
            return 0;
        }
        ctx->rounds = rounds;
    }
    return 1;
}

CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(rc5)
OSSL_PARAM_uint(OSSL_CIPHER_PARAM_ROUNDS, NULL),
    CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(rc5)

        CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(rc5)
            OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
    OSSL_PARAM_uint(OSSL_CIPHER_PARAM_ROUNDS, NULL),
    CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(rc5)

        static int rc5_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
    PROV_RC5_CTX *ctx = (PROV_RC5_CTX *)vctx;
    OSSL_PARAM *p;

    if (!ossl_cipher_generic_get_ctx_params(vctx, params))
        return 0;
    p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_ROUNDS);
    if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->rounds)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
        return 0;
    }
    return 1;
}

#define IMPLEMENT_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits,                       \
    blkbits, ivbits, typ)                                                                \
    static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params;         \
    static int alg##_##kbits##_##lcmode##_get_params(OSSL_PARAM params[])                \
    {                                                                                    \
        return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,          \
            flags, kbits, blkbits, ivbits);                                              \
    }                                                                                    \
    static OSSL_FUNC_cipher_newctx_fn alg##_##kbits##_##lcmode##_newctx;                 \
    static void *alg##_##kbits##_##lcmode##_newctx(void *provctx)                        \
    {                                                                                    \
        PROV_##UCALG##_CTX *ctx;                                                         \
        if (!ossl_prov_is_running())                                                     \
            return NULL;                                                                 \
        ctx = OPENSSL_zalloc(sizeof(*ctx));                                              \
        if (ctx != NULL) {                                                               \
            ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits,                     \
                EVP_CIPH_##UCMODE##_MODE, flags,                                         \
                ossl_prov_cipher_hw_##alg##_##lcmode(kbits),                             \
                NULL);                                                                   \
            ctx->rounds = RC5_12_ROUNDS;                                                 \
        }                                                                                \
        return ctx;                                                                      \
    }                                                                                    \
    const OSSL_DISPATCH ossl_##alg##kbits##lcmode##_functions[] = {                      \
        { OSSL_FUNC_CIPHER_NEWCTX,                                                       \
            (void (*)(void))alg##_##kbits##_##lcmode##_newctx },                         \
        { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))alg##_freectx },                     \
        { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))alg##_dupctx },                       \
        { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))rc5_einit },                    \
        { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))rc5_dinit },                    \
        { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))ossl_cipher_generic_##typ##_update }, \
        { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))ossl_cipher_generic_##typ##_final },   \
        { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher },         \
        { OSSL_FUNC_CIPHER_GET_PARAMS,                                                   \
            (void (*)(void))alg##_##kbits##_##lcmode##_get_params },                     \
        { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                              \
            (void (*)(void))ossl_cipher_generic_gettable_params },                       \
        { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                               \
            (void (*)(void))rc5_get_ctx_params },                                        \
        { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                          \
            (void (*)(void))rc5_gettable_ctx_params },                                   \
        { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                               \
            (void (*)(void))rc5_set_ctx_params },                                        \
        { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                          \
            (void (*)(void))rc5_settable_ctx_params },                                   \
        { 0, NULL }                                                                      \
    };

/* ossl_rc5128ecb_functions */
IMPLEMENT_cipher(rc5, RC5, ecb, ECB, RC5_FLAGS, 128, 64, 0, block)
/* ossl_rc5128cbc_functions */
IMPLEMENT_cipher(rc5, RC5, cbc, CBC, RC5_FLAGS, 128, 64, 64, block)
/* ossl_rc5128ofb64_functions */
IMPLEMENT_cipher(rc5, RC5, ofb64, OFB, RC5_FLAGS, 128, 8, 64, stream)
/* ossl_rc5128cfb64_functions */
IMPLEMENT_cipher(rc5, RC5, cfb64, CFB, RC5_FLAGS, 128, 8, 64, stream)
