123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include "common/utils/assertions.h"
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#include "sha_256_hmac.h"
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#include <openssl/hmac.h>
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#if OPENSSL_VERSION_NUMBER >= 0x30000000L
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/* code for version 3.0 or greater */
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#include <openssl/core_names.h>
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void sha_256_hmac(const uint8_t key[32], byte_array_t data, size_t len, uint8_t out[len])
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{
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DevAssert(key != NULL);
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DevAssert(data.buf != NULL);
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DevAssert(data.len != 0);
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DevAssert(len != 0);
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OSSL_LIB_CTX* library_context = OSSL_LIB_CTX_new();
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DevAssert(library_context != NULL);
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// A property query used for selecting the MAC implementation.
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const char* propq = NULL;
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// Fetch the HMAC implementation
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EVP_MAC* mac = EVP_MAC_fetch(library_context, "HMAC", propq);
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DevAssert(mac != NULL);
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// Create a context for the HMAC operation
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EVP_MAC_CTX* mctx = EVP_MAC_CTX_new(mac);
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DevAssert(mctx != NULL);
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// The underlying digest to be used
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OSSL_PARAM params[2] = {0};
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char digest_name[] = "SHA2-256";
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params[0] = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, digest_name, sizeof(digest_name));
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params[1] = OSSL_PARAM_construct_end();
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// Initialise the HMAC operation
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int rc = EVP_MAC_init(mctx, key, 32, params);
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DevAssert(rc == 1);
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// Make one or more calls to process the data to be authenticated
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rc = EVP_MAC_update(mctx, data.buf, data.len);
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DevAssert(rc == 1);
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// Make one call to the final to get the MAC
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rc = EVP_MAC_final(mctx, out, &len, len);
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DevAssert(rc == 1);
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// OpenSSL free functions will ignore NULL arguments
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EVP_MAC_CTX_free(mctx);
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EVP_MAC_free(mac);
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OSSL_LIB_CTX_free(library_context);
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}
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#elif OPENSSL_VERSION_NUMBER >= 0x10100000L
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/* code for version >= 1.1.0 and < 3.0.0 */
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void sha_256_hmac(const uint8_t key[32], byte_array_t data, size_t len, uint8_t out[len])
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{
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DevAssert(key != NULL);
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DevAssert(data.buf != NULL);
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DevAssert(data.len != 0);
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DevAssert(len != 0);
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HMAC_CTX* ctx = HMAC_CTX_new();
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HMAC_Init_ex(ctx, key, 32, EVP_sha256(), NULL);
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HMAC_Update(ctx, data.buf, data.len);
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HMAC_Final(ctx, out, (uint32_t*)&len);
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HMAC_CTX_free(ctx);
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}
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#else
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/* code for version lower than 1.1.0 */
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void sha_256_hmac(const uint8_t key[32], byte_array_t data, size_t len, uint8_t out[len])
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{
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DevAssert(key != NULL);
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DevAssert(data.buf != NULL);
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DevAssert(data.len != 0);
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DevAssert(len != 0);
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HMAC_CTX ctx;
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HMAC_CTX_init(&ctx);
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HMAC_Init_ex(&ctx, key, 32, EVP_sha256(), NULL);
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HMAC_Update(&ctx, data.buf, data.len);
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HMAC_Final(&ctx, out, (uint32_t*)&len);
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HMAC_CTX_cleanup(&ctx);
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}
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#endif
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