[331] | 1 | /*
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| 2 | * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/opensslconf.h>
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include <string.h>
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| 14 |
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| 15 | #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
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| 16 |
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| 17 | # include <openssl/crypto.h>
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| 18 | # include <openssl/evp.h>
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| 19 | # include <openssl/objects.h>
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| 20 | # include <openssl/rc4.h>
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| 21 | # include <openssl/md5.h>
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| 22 | # include "internal/evp_int.h"
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| 23 |
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| 24 | typedef struct {
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| 25 | RC4_KEY ks;
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| 26 | MD5_CTX head, tail, md;
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| 27 | size_t payload_length;
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| 28 | } EVP_RC4_HMAC_MD5;
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| 29 |
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| 30 | # define NO_PAYLOAD_LENGTH ((size_t)-1)
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| 31 |
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| 32 | void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
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| 33 | MD5_CTX *ctx, const void *inp, size_t blocks);
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| 34 |
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| 35 | # define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))
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| 36 |
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| 37 | static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
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| 38 | const unsigned char *inkey,
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| 39 | const unsigned char *iv, int enc)
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| 40 | {
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| 41 | EVP_RC4_HMAC_MD5 *key = data(ctx);
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| 42 |
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| 43 | RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);
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| 44 |
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| 45 | MD5_Init(&key->head); /* handy when benchmarking */
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| 46 | key->tail = key->head;
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| 47 | key->md = key->head;
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| 48 |
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| 49 | key->payload_length = NO_PAYLOAD_LENGTH;
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| 50 |
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| 51 | return 1;
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| 52 | }
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| 53 |
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| 54 | # if defined(RC4_ASM) && defined(MD5_ASM) && ( \
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| 55 | defined(__x86_64) || defined(__x86_64__) || \
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| 56 | defined(_M_AMD64) || defined(_M_X64) )
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| 57 | # define STITCHED_CALL
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| 58 | # endif
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| 59 |
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| 60 | # if !defined(STITCHED_CALL)
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| 61 | # define rc4_off 0
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| 62 | # define md5_off 0
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| 63 | # endif
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| 64 |
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| 65 | static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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| 66 | const unsigned char *in, size_t len)
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| 67 | {
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| 68 | EVP_RC4_HMAC_MD5 *key = data(ctx);
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| 69 | # if defined(STITCHED_CALL)
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| 70 | size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
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| 71 | * rc4_md5-x86_64.pl */
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| 72 | md5_off = MD5_CBLOCK - key->md.num, blocks;
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| 73 | unsigned int l;
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| 74 | extern unsigned int OPENSSL_ia32cap_P[];
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| 75 | # endif
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| 76 | size_t plen = key->payload_length;
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| 77 |
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| 78 | if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
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| 79 | return 0;
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| 80 |
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| 81 | if (EVP_CIPHER_CTX_encrypting(ctx)) {
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| 82 | if (plen == NO_PAYLOAD_LENGTH)
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| 83 | plen = len;
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| 84 | # if defined(STITCHED_CALL)
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| 85 | /* cipher has to "fall behind" */
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| 86 | if (rc4_off > md5_off)
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| 87 | md5_off += MD5_CBLOCK;
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| 88 |
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| 89 | if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
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| 90 | (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
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| 91 | MD5_Update(&key->md, in, md5_off);
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| 92 | RC4(&key->ks, rc4_off, in, out);
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| 93 |
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| 94 | rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
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| 95 | &key->md, in + md5_off, blocks);
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| 96 | blocks *= MD5_CBLOCK;
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| 97 | rc4_off += blocks;
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| 98 | md5_off += blocks;
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| 99 | key->md.Nh += blocks >> 29;
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| 100 | key->md.Nl += blocks <<= 3;
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| 101 | if (key->md.Nl < (unsigned int)blocks)
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| 102 | key->md.Nh++;
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| 103 | } else {
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| 104 | rc4_off = 0;
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| 105 | md5_off = 0;
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| 106 | }
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| 107 | # endif
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| 108 | MD5_Update(&key->md, in + md5_off, plen - md5_off);
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| 109 |
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| 110 | if (plen != len) { /* "TLS" mode of operation */
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| 111 | if (in != out)
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| 112 | memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);
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| 113 |
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| 114 | /* calculate HMAC and append it to payload */
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| 115 | MD5_Final(out + plen, &key->md);
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| 116 | key->md = key->tail;
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| 117 | MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
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| 118 | MD5_Final(out + plen, &key->md);
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| 119 | /* encrypt HMAC at once */
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| 120 | RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
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| 121 | } else {
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| 122 | RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
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| 123 | }
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| 124 | } else {
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| 125 | unsigned char mac[MD5_DIGEST_LENGTH];
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| 126 | # if defined(STITCHED_CALL)
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| 127 | /* digest has to "fall behind" */
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| 128 | if (md5_off > rc4_off)
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| 129 | rc4_off += 2 * MD5_CBLOCK;
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| 130 | else
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| 131 | rc4_off += MD5_CBLOCK;
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| 132 |
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| 133 | if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
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| 134 | (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
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| 135 | RC4(&key->ks, rc4_off, in, out);
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| 136 | MD5_Update(&key->md, out, md5_off);
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| 137 |
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| 138 | rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
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| 139 | &key->md, out + md5_off, blocks);
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| 140 | blocks *= MD5_CBLOCK;
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| 141 | rc4_off += blocks;
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| 142 | md5_off += blocks;
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| 143 | l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
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| 144 | if (l < key->md.Nl)
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| 145 | key->md.Nh++;
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| 146 | key->md.Nl = l;
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| 147 | key->md.Nh += blocks >> 29;
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| 148 | } else {
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| 149 | md5_off = 0;
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| 150 | rc4_off = 0;
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| 151 | }
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| 152 | # endif
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| 153 | /* decrypt HMAC at once */
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| 154 | RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
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| 155 | if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
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| 156 | MD5_Update(&key->md, out + md5_off, plen - md5_off);
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| 157 |
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| 158 | /* calculate HMAC and verify it */
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| 159 | MD5_Final(mac, &key->md);
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| 160 | key->md = key->tail;
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| 161 | MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
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| 162 | MD5_Final(mac, &key->md);
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| 163 |
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| 164 | if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
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| 165 | return 0;
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| 166 | } else {
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| 167 | MD5_Update(&key->md, out + md5_off, len - md5_off);
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| 168 | }
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| 169 | }
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| 170 |
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| 171 | key->payload_length = NO_PAYLOAD_LENGTH;
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| 172 |
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| 173 | return 1;
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| 174 | }
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| 175 |
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| 176 | static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
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| 177 | void *ptr)
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| 178 | {
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| 179 | EVP_RC4_HMAC_MD5 *key = data(ctx);
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| 180 |
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| 181 | switch (type) {
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| 182 | case EVP_CTRL_AEAD_SET_MAC_KEY:
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| 183 | {
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| 184 | unsigned int i;
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| 185 | unsigned char hmac_key[64];
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| 186 |
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| 187 | memset(hmac_key, 0, sizeof(hmac_key));
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| 188 |
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| 189 | if (arg > (int)sizeof(hmac_key)) {
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| 190 | MD5_Init(&key->head);
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| 191 | MD5_Update(&key->head, ptr, arg);
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| 192 | MD5_Final(hmac_key, &key->head);
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| 193 | } else {
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| 194 | memcpy(hmac_key, ptr, arg);
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| 195 | }
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| 196 |
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| 197 | for (i = 0; i < sizeof(hmac_key); i++)
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| 198 | hmac_key[i] ^= 0x36; /* ipad */
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| 199 | MD5_Init(&key->head);
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| 200 | MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
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| 201 |
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| 202 | for (i = 0; i < sizeof(hmac_key); i++)
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| 203 | hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
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| 204 | MD5_Init(&key->tail);
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| 205 | MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
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| 206 |
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| 207 | OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
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| 208 |
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| 209 | return 1;
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| 210 | }
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| 211 | case EVP_CTRL_AEAD_TLS1_AAD:
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| 212 | {
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| 213 | unsigned char *p = ptr;
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| 214 | unsigned int len;
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| 215 |
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| 216 | if (arg != EVP_AEAD_TLS1_AAD_LEN)
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| 217 | return -1;
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| 218 |
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| 219 | len = p[arg - 2] << 8 | p[arg - 1];
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| 220 |
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| 221 | if (!EVP_CIPHER_CTX_encrypting(ctx)) {
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| 222 | if (len < MD5_DIGEST_LENGTH)
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| 223 | return -1;
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| 224 | len -= MD5_DIGEST_LENGTH;
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| 225 | p[arg - 2] = len >> 8;
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| 226 | p[arg - 1] = len;
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| 227 | }
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| 228 | key->payload_length = len;
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| 229 | key->md = key->head;
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| 230 | MD5_Update(&key->md, p, arg);
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| 231 |
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| 232 | return MD5_DIGEST_LENGTH;
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| 233 | }
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| 234 | default:
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| 235 | return -1;
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| 236 | }
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| 237 | }
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| 238 |
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| 239 | static EVP_CIPHER r4_hmac_md5_cipher = {
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| 240 | # ifdef NID_rc4_hmac_md5
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| 241 | NID_rc4_hmac_md5,
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| 242 | # else
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| 243 | NID_undef,
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| 244 | # endif
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| 245 | 1, EVP_RC4_KEY_SIZE, 0,
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| 246 | EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
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| 247 | EVP_CIPH_FLAG_AEAD_CIPHER,
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| 248 | rc4_hmac_md5_init_key,
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| 249 | rc4_hmac_md5_cipher,
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| 250 | NULL,
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| 251 | sizeof(EVP_RC4_HMAC_MD5),
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| 252 | NULL,
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| 253 | NULL,
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| 254 | rc4_hmac_md5_ctrl,
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| 255 | NULL
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| 256 | };
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| 257 |
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| 258 | const EVP_CIPHER *EVP_rc4_hmac_md5(void)
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| 259 | {
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| 260 | return (&r4_hmac_md5_cipher);
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| 261 | }
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| 262 | #endif
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