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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Package: noscrypt
* File: providers/openssl.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with noscrypt. If not, see http://www.gnu.org/licenses/.
*/
#include <openssl/crypto.h>
#include <openssl/evp.h>
#define OSSL_SHA256 "SHA2-256"
#define OSSL_HMAC "hmac"
#define ossl_evp_fetch_chacha20() EVP_CIPHER_fetch(NULL, "ChaCha20", NULL)
typedef enum {
EvpStateTypeDigest,
EvpStateTypeMac
} _evp_state_type;
struct ossl_evp_state {
void* _context;
void* _cipher;
OSSL_PARAM params[2];
_evp_state_type type;
cspan_t _prk;
};
_IMPLSTB EVP_MAC_CTX* _osslEvpGetMacContext(const struct ossl_evp_state* state)
{
DEBUG_ASSERT(state != NULL);
DEBUG_ASSERT(state->type == EvpStateTypeMac);
return (EVP_MAC_CTX*)state->_context;
}
_IMPLSTB EVP_MD_CTX* _osslEvpGetMdContext(const struct ossl_evp_state* state)
{
DEBUG_ASSERT(state != NULL);
DEBUG_ASSERT(state->type == EvpStateTypeDigest);
return (EVP_MD_CTX*)state->_context;
}
_IMPLSTB cspan_t _osslEvpGetPrk(const struct ossl_evp_state* state)
{
DEBUG_ASSERT(state != NULL);
return state->_prk;
}
_IMPLSTB void _osslEvpSetPrk(struct ossl_evp_state* state, cspan_t prk)
{
DEBUG_ASSERT(state != NULL);
state->_prk = prk;
}
_IMPLSTB cstatus_t _osslEvpUpdate(const struct ossl_evp_state* state, cspan_t data)
{
int result;
DEBUG_ASSERT(state != NULL);
result = 0;
switch (state->type)
{
case EvpStateTypeDigest:
result = EVP_DigestUpdate(
_osslEvpGetMdContext(state),
ncSpanGetOffsetC(data, 0),
ncSpanGetSizeC(data)
);
break;
case EvpStateTypeMac:
result = EVP_MAC_update(
_osslEvpGetMacContext(state),
ncSpanGetOffsetC(data, 0),
ncSpanGetSizeC(data)
);
break;
}
return (cstatus_t)(result != 0);
}
_IMPLSTB cstatus_t _osslEvpFinal(const struct ossl_evp_state* state, span_t out)
{
int result;
size_t hmacLen;
unsigned int mdLen;
DEBUG_ASSERT(state != NULL);
result = 0;
mdLen = hmacLen = ncSpanGetSize(out);
switch (state->type)
{
case EvpStateTypeDigest:
result = EVP_DigestFinal_ex(
_osslEvpGetMdContext(state),
ncSpanGetOffset(out, 0),
&mdLen
);
return (cstatus_t)(result != 0 && mdLen == ncSpanGetSize(out));
case EvpStateTypeMac:
result = EVP_MAC_final(
_osslEvpGetMacContext(state),
ncSpanGetOffset(out, 0),
&hmacLen,
hmacLen
);
return (cstatus_t)(result != 0 && hmacLen == ncSpanGetSize(out));
}
/*
* If the result is non-zero and the hash length is equal to the output
* buffer size, return success, otherwise return failure.
*/
return CSTATUS_FAIL;
}
_IMPLSTB cstatus_t _osslEvpMacInit(const struct ossl_evp_state* state)
{
int result;
DEBUG_ASSERT(state != NULL);
DEBUG_ASSERT(state->type == EvpStateTypeMac);
DEBUG_ASSERT(ncSpanIsValidC(state->_prk));
result = EVP_MAC_init(
_osslEvpGetMacContext(state),
ncSpanGetOffsetC(state->_prk, 0),
ncSpanGetSizeC(state->_prk),
state->params
);
return (cstatus_t)(result != 0);
}
_IMPLSTB void _osslEvpFree(struct ossl_evp_state* state)
{
DEBUG_ASSERT(state != NULL);
switch (state->type)
{
case EvpStateTypeDigest:
if (state->_context) EVP_MD_CTX_free(state->_context);
if (state->_cipher) EVP_MD_free(state->_cipher);
break;
case EvpStateTypeMac:
if (state->_context) EVP_MAC_CTX_free(state->_context);
if (state->_cipher) EVP_MAC_free(state->_cipher);
break;
}
}
_IMPLSTB cstatus_t _osslEvpInit(
struct ossl_evp_state* state,
_evp_state_type type,
const char* providerName
)
{
DEBUG_ASSERT(state != NULL);
DEBUG_ASSERT(providerName != NULL);
state->type = type;
switch (type)
{
case EvpStateTypeDigest:
state->_cipher = EVP_MD_fetch(NULL, providerName, NULL);
state->_context = EVP_MD_CTX_new();
break;
case EvpStateTypeMac:
state->_cipher = EVP_MAC_fetch(NULL, providerName, NULL);
if (state->_cipher)
{
state->_context = EVP_MAC_CTX_new((EVP_MAC*)(state->_cipher));
}
break;
default:
return CSTATUS_FAIL;
}
/*
* Ensure allocations succeded, otherwise free the context
* and return a failure status.
*/
if (state->_cipher == NULL || state->_context == NULL)
{
return CSTATUS_FAIL;
}
/*
* If the type is a digest, initialize the digest context
*/
if (type == EvpStateTypeDigest)
{
if (
!EVP_DigestInit_ex(
state->_context,
state->_cipher,
NULL
)
)
{
return CSTATUS_FAIL;
}
}
return CSTATUS_OK;
}
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