1 /* 2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* Functions which are used by both single and triple DES enctypes */ 35 36 #include "krb5_locl.h" 37 38 /* 39 * A = A xor B. A & B are 8 bytes. 40 */ 41 42 void 43 _krb5_xor (DES_cblock *key, const unsigned char *b) 44 { 45 unsigned char *a = (unsigned char*)key; 46 a[0] ^= b[0]; 47 a[1] ^= b[1]; 48 a[2] ^= b[2]; 49 a[3] ^= b[3]; 50 a[4] ^= b[4]; 51 a[5] ^= b[5]; 52 a[6] ^= b[6]; 53 a[7] ^= b[7]; 54 } 55 56 #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO) 57 krb5_error_code 58 _krb5_des_checksum(krb5_context context, 59 const EVP_MD *evp_md, 60 struct _krb5_key_data *key, 61 const void *data, 62 size_t len, 63 Checksum *cksum) 64 { 65 struct _krb5_evp_schedule *ctx = key->schedule->data; 66 EVP_MD_CTX *m; 67 DES_cblock ivec; 68 unsigned char *p = cksum->checksum.data; 69 70 krb5_generate_random_block(p, 8); 71 72 m = EVP_MD_CTX_create(); 73 if (m == NULL) { 74 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); 75 return ENOMEM; 76 } 77 78 EVP_DigestInit_ex(m, evp_md, NULL); 79 EVP_DigestUpdate(m, p, 8); 80 EVP_DigestUpdate(m, data, len); 81 EVP_DigestFinal_ex (m, p + 8, NULL); 82 EVP_MD_CTX_destroy(m); 83 memset (&ivec, 0, sizeof(ivec)); 84 EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1); 85 EVP_Cipher(&ctx->ectx, p, p, 24); 86 87 return 0; 88 } 89 90 krb5_error_code 91 _krb5_des_verify(krb5_context context, 92 const EVP_MD *evp_md, 93 struct _krb5_key_data *key, 94 const void *data, 95 size_t len, 96 Checksum *C) 97 { 98 struct _krb5_evp_schedule *ctx = key->schedule->data; 99 EVP_MD_CTX *m; 100 unsigned char tmp[24]; 101 unsigned char res[16]; 102 DES_cblock ivec; 103 krb5_error_code ret = 0; 104 105 m = EVP_MD_CTX_create(); 106 if (m == NULL) { 107 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); 108 return ENOMEM; 109 } 110 111 memset(&ivec, 0, sizeof(ivec)); 112 EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1); 113 EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24); 114 115 EVP_DigestInit_ex(m, evp_md, NULL); 116 EVP_DigestUpdate(m, tmp, 8); /* confounder */ 117 EVP_DigestUpdate(m, data, len); 118 EVP_DigestFinal_ex (m, res, NULL); 119 EVP_MD_CTX_destroy(m); 120 if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) { 121 krb5_clear_error_message (context); 122 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 123 } 124 memset(tmp, 0, sizeof(tmp)); 125 memset(res, 0, sizeof(res)); 126 return ret; 127 } 128 129 #endif 130 131 static krb5_error_code 132 RSA_MD5_checksum(krb5_context context, 133 struct _krb5_key_data *key, 134 const void *data, 135 size_t len, 136 unsigned usage, 137 Checksum *C) 138 { 139 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1) 140 krb5_abortx(context, "md5 checksum failed"); 141 return 0; 142 } 143 144 struct _krb5_checksum_type _krb5_checksum_rsa_md5 = { 145 CKSUMTYPE_RSA_MD5, 146 "rsa-md5", 147 64, 148 16, 149 F_CPROOF, 150 RSA_MD5_checksum, 151 NULL 152 }; 153