1 /* 2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* 11 * SHA-1 low level APIs are deprecated for public use, but still ok for 12 * internal use. 13 */ 14 #include "internal/deprecated.h" 15 16 #include <openssl/crypto.h> 17 #include <openssl/opensslconf.h> 18 19 #include <openssl/opensslv.h> 20 #include <openssl/evp.h> 21 #include <openssl/sha.h> 22 23 /* The implementation is in ../md32_common.h */ 24 25 #include "sha_local.h" 26 #include "crypto/sha.h" 27 28 int ossl_sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms) 29 { 30 unsigned char padtmp[40]; 31 unsigned char sha1tmp[SHA_DIGEST_LENGTH]; 32 33 if (cmd != EVP_CTRL_SSL3_MASTER_SECRET) 34 return -2; 35 36 if (sha1 == NULL) 37 return 0; 38 39 /* SSLv3 client auth handling: see RFC-6101 5.6.8 */ 40 if (mslen != 48) 41 return 0; 42 43 /* At this point hash contains all handshake messages, update 44 * with master secret and pad_1. 45 */ 46 47 if (SHA1_Update(sha1, ms, mslen) <= 0) 48 return 0; 49 50 /* Set padtmp to pad_1 value */ 51 memset(padtmp, 0x36, sizeof(padtmp)); 52 53 if (!SHA1_Update(sha1, padtmp, sizeof(padtmp))) 54 return 0; 55 56 if (!SHA1_Final(sha1tmp, sha1)) 57 return 0; 58 59 /* Reinitialise context */ 60 61 if (!SHA1_Init(sha1)) 62 return 0; 63 64 if (SHA1_Update(sha1, ms, mslen) <= 0) 65 return 0; 66 67 /* Set padtmp to pad_2 value */ 68 memset(padtmp, 0x5c, sizeof(padtmp)); 69 70 if (!SHA1_Update(sha1, padtmp, sizeof(padtmp))) 71 return 0; 72 73 if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp))) 74 return 0; 75 76 /* Now when ctx is finalised it will return the SSL v3 hash value */ 77 OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp)); 78 79 return 1; 80 } 81