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/*
* Copyright 2020 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
*/
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include "prov/implementations.h"
#include "prov/ciphercommon.h"
#include "prov/providercommonerr.h"
static OSSL_FUNC_cipher_newctx_fn null_newctx;
static void *null_newctx(void *provctx)
{
static int dummy = 0;
return &dummy;
}
static OSSL_FUNC_cipher_freectx_fn null_freectx;
static void null_freectx(void *vctx)
{
}
static OSSL_FUNC_cipher_encrypt_init_fn null_init;
static int null_init(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
return 1;
}
static OSSL_FUNC_cipher_cipher_fn null_cipher;
static int null_cipher(void *vctx, unsigned char *out, size_t *outl,
size_t outsize, const unsigned char *in, size_t inl)
{
if (outsize < inl)
return 0;
if (in != out)
memcpy(out, in, inl);
*outl = inl;
return 1;
}
static OSSL_FUNC_cipher_final_fn null_final;
static int null_final(void *vctx, unsigned char *out, size_t *outl,
size_t outsize)
{
*outl = 0;
return 1;
}
static OSSL_FUNC_cipher_get_params_fn null_get_params;
static int null_get_params(OSSL_PARAM params[])
{
return cipher_generic_get_params(params, 0, 0, 0, 8, 0);
}
static const OSSL_PARAM null_known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
OSSL_PARAM_END
};
static OSSL_FUNC_cipher_gettable_ctx_params_fn null_gettable_ctx_params;
static const OSSL_PARAM *null_gettable_ctx_params(void)
{
return null_known_gettable_ctx_params;
}
static OSSL_FUNC_cipher_get_ctx_params_fn null_get_ctx_params;
static int null_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
return 1;
}
const OSSL_DISPATCH null_functions[] = {
{ OSSL_FUNC_CIPHER_NEWCTX,
(void (*)(void)) null_newctx },
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) null_freectx },
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) null_newctx },
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))null_init },
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))null_init },
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))null_cipher },
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))null_final },
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))null_cipher },
{ OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void)) null_get_params },
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
(void (*)(void))cipher_generic_gettable_params },
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))null_get_ctx_params },
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
(void (*)(void))null_gettable_ctx_params },
{ 0, NULL }
};
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