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/*
* 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)
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)
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