mirror of
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81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* SHA-1 low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <openssl/crypto.h>
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#include <openssl/opensslconf.h>
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#include <openssl/opensslv.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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/* The implementation is in crypto/md32_common.h */
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#include "sha_local.h"
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#include "crypto/sha.h"
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int ossl_sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms)
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{
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unsigned char padtmp[40];
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unsigned char sha1tmp[SHA_DIGEST_LENGTH];
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if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)
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return -2;
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if (sha1 == NULL)
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return 0;
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/* SSLv3 client auth handling: see RFC-6101 5.6.8 */
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if (mslen != 48)
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return 0;
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/* At this point hash contains all handshake messages, update
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* with master secret and pad_1.
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*/
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if (SHA1_Update(sha1, ms, mslen) <= 0)
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return 0;
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/* Set padtmp to pad_1 value */
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memset(padtmp, 0x36, sizeof(padtmp));
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if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
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return 0;
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if (!SHA1_Final(sha1tmp, sha1))
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return 0;
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/* Reinitialise context */
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if (!SHA1_Init(sha1))
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return 0;
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if (SHA1_Update(sha1, ms, mslen) <= 0)
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return 0;
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/* Set padtmp to pad_2 value */
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memset(padtmp, 0x5c, sizeof(padtmp));
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if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
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return 0;
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if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp)))
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return 0;
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/* Now when ctx is finalised it will return the SSL v3 hash value */
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OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));
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return 1;
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}
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