Viewing file:  cipher_rc4.c (5.61 KB) -rw-r--r--
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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 RC4 ciphers */
/*
* RC4 low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include "cipher_rc4.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#define RC4_FLAGS PROV_CIPHER_FLAG_VARIABLE_LENGTH
static OSSL_FUNC_cipher_encrypt_init_fn rc4_einit;
static OSSL_FUNC_cipher_decrypt_init_fn rc4_dinit;
static OSSL_FUNC_cipher_freectx_fn rc4_freectx;
static OSSL_FUNC_cipher_dupctx_fn rc4_dupctx;
static void rc4_freectx(void *vctx)
{
PROV_RC4_CTX *ctx = (PROV_RC4_CTX *)vctx;
ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
static void *rc4_dupctx(void *ctx)
{
PROV_RC4_CTX *in = (PROV_RC4_CTX *)ctx;
PROV_RC4_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 rc4_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 ossl_cipher_var_keylen_set_ctx_params(ctx, params);
}
static int rc4_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 ossl_cipher_var_keylen_set_ctx_params(ctx, params);
}
#define IMPLEMENT_cipher(alg, UCALG, flags, kbits, blkbits, ivbits, typ) \
static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_get_params; \
static int alg##_##kbits##_get_params(OSSL_PARAM params[]) \
{ \
return ossl_cipher_generic_get_params(params, 0, flags, \
kbits, blkbits, ivbits); \
} \
static OSSL_FUNC_cipher_newctx_fn alg##_##kbits##_newctx; \
static void * alg##_##kbits##_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, 0, flags, \
ossl_prov_cipher_hw_##alg(kbits), NULL); \
} \
return ctx; \
} \
const OSSL_DISPATCH ossl_##alg##kbits##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void)) alg##_##kbits##_newctx }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))rc4_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))rc4_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##_get_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))ossl_cipher_generic_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))ossl_cipher_var_keylen_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))ossl_cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))ossl_cipher_generic_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))ossl_cipher_var_keylen_settable_ctx_params }, \
{ 0, NULL } \
};
/* ossl_rc440_functions */
IMPLEMENT_cipher(rc4, RC4, RC4_FLAGS, 40, 8, 0, stream)
/* ossl_rc4128_functions */
IMPLEMENT_cipher(rc4, RC4, RC4_FLAGS, 128, 8, 0, stream)
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