diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/hkdf.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/hkdf.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/lib/mbedtls-2.27.0/library/hkdf.c b/lib/mbedtls-2.27.0/library/hkdf.c deleted file mode 100644 index 5013729..0000000 --- a/lib/mbedtls-2.27.0/library/hkdf.c +++ /dev/null @@ -1,189 +0,0 @@ -/* - * HKDF implementation -- RFC 5869 - * - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 - * - * Licensed under the Apache License, Version 2.0 (the "License"); you may - * not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT - * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ -#include "common.h" - -#if defined(MBEDTLS_HKDF_C) - -#include <string.h> -#include "mbedtls/hkdf.h" -#include "mbedtls/platform_util.h" -#include "mbedtls/error.h" - -int mbedtls_hkdf( const mbedtls_md_info_t *md, const unsigned char *salt, - size_t salt_len, const unsigned char *ikm, size_t ikm_len, - const unsigned char *info, size_t info_len, - unsigned char *okm, size_t okm_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char prk[MBEDTLS_MD_MAX_SIZE]; - - ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, prk ); - - if( ret == 0 ) - { - ret = mbedtls_hkdf_expand( md, prk, mbedtls_md_get_size( md ), - info, info_len, okm, okm_len ); - } - - mbedtls_platform_zeroize( prk, sizeof( prk ) ); - - return( ret ); -} - -int mbedtls_hkdf_extract( const mbedtls_md_info_t *md, - const unsigned char *salt, size_t salt_len, - const unsigned char *ikm, size_t ikm_len, - unsigned char *prk ) -{ - unsigned char null_salt[MBEDTLS_MD_MAX_SIZE] = { '\0' }; - - if( salt == NULL ) - { - size_t hash_len; - - if( salt_len != 0 ) - { - return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA; - } - - hash_len = mbedtls_md_get_size( md ); - - if( hash_len == 0 ) - { - return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA; - } - - salt = null_salt; - salt_len = hash_len; - } - - return( mbedtls_md_hmac( md, salt, salt_len, ikm, ikm_len, prk ) ); -} - -int mbedtls_hkdf_expand( const mbedtls_md_info_t *md, const unsigned char *prk, - size_t prk_len, const unsigned char *info, - size_t info_len, unsigned char *okm, size_t okm_len ) -{ - size_t hash_len; - size_t where = 0; - size_t n; - size_t t_len = 0; - size_t i; - int ret = 0; - mbedtls_md_context_t ctx; - unsigned char t[MBEDTLS_MD_MAX_SIZE]; - - if( okm == NULL ) - { - return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ); - } - - hash_len = mbedtls_md_get_size( md ); - - if( prk_len < hash_len || hash_len == 0 ) - { - return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ); - } - - if( info == NULL ) - { - info = (const unsigned char *) ""; - info_len = 0; - } - - n = okm_len / hash_len; - - if( okm_len % hash_len != 0 ) - { - n++; - } - - /* - * Per RFC 5869 Section 2.3, okm_len must not exceed - * 255 times the hash length - */ - if( n > 255 ) - { - return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA ); - } - - mbedtls_md_init( &ctx ); - - if( ( ret = mbedtls_md_setup( &ctx, md, 1 ) ) != 0 ) - { - goto exit; - } - - memset( t, 0, hash_len ); - - /* - * Compute T = T(1) | T(2) | T(3) | ... | T(N) - * Where T(N) is defined in RFC 5869 Section 2.3 - */ - for( i = 1; i <= n; i++ ) - { - size_t num_to_copy; - unsigned char c = i & 0xff; - - ret = mbedtls_md_hmac_starts( &ctx, prk, prk_len ); - if( ret != 0 ) - { - goto exit; - } - - ret = mbedtls_md_hmac_update( &ctx, t, t_len ); - if( ret != 0 ) - { - goto exit; - } - - ret = mbedtls_md_hmac_update( &ctx, info, info_len ); - if( ret != 0 ) - { - goto exit; - } - - /* The constant concatenated to the end of each T(n) is a single octet. - * */ - ret = mbedtls_md_hmac_update( &ctx, &c, 1 ); - if( ret != 0 ) - { - goto exit; - } - - ret = mbedtls_md_hmac_finish( &ctx, t ); - if( ret != 0 ) - { - goto exit; - } - - num_to_copy = i != n ? hash_len : okm_len - where; - memcpy( okm + where, t, num_to_copy ); - where += hash_len; - t_len = hash_len; - } - -exit: - mbedtls_md_free( &ctx ); - mbedtls_platform_zeroize( t, sizeof( t ) ); - - return( ret ); -} - -#endif /* MBEDTLS_HKDF_C */ |