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/*
* Copyright 1995-2022 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
*/
/*
* SHA-1 low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/crypto.h>
#include <openssl/opensslconf.h>
#include <openssl/opensslv.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
/* The implementation is in crypto/md32_common.h */
#include "sha_local.h"
#include "crypto/sha.h"
int ossl_sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms)
{
unsigned char padtmp[40];
unsigned char sha1tmp[SHA_DIGEST_LENGTH];
if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)
return -2;
if (sha1 == NULL)
return 0;
/* SSLv3 client auth handling: see RFC-6101 5.6.8 */
if (mslen != 48)
return 0;
/* At this point hash contains all handshake messages, update
* with master secret and pad_1.
*/
if (SHA1_Update(sha1, ms, mslen) <= 0)
return 0;
/* Set padtmp to pad_1 value */
memset(padtmp, 0x36, sizeof(padtmp));
if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
return 0;
if (!SHA1_Final(sha1tmp, sha1))
return 0;
/* Reinitialise context */
if (!SHA1_Init(sha1))
return 0;
if (SHA1_Update(sha1, ms, mslen) <= 0)
return 0;
/* Set padtmp to pad_2 value */
memset(padtmp, 0x5c, sizeof(padtmp));
if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
return 0;
if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp)))
return 0;
/* Now when ctx is finalised it will return the SSL v3 hash value */
OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));
return 1;
}
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