1 /* $NetBSD: crypto-des-common.c,v 1.4 2019/12/15 22:50:50 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* Functions which are used by both single and triple DES enctypes */ 37 38 #include "krb5_locl.h" 39 40 /* 41 * A = A xor B. A & B are 8 bytes. 42 */ 43 44 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 45 _krb5_xor8(unsigned char *a, const unsigned char *b) 46 { 47 a[0] ^= b[0]; 48 a[1] ^= b[1]; 49 a[2] ^= b[2]; 50 a[3] ^= b[3]; 51 a[4] ^= b[4]; 52 a[5] ^= b[5]; 53 a[6] ^= b[6]; 54 a[7] ^= b[7]; 55 } 56 57 #if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO) 58 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 59 _krb5_des_checksum(krb5_context context, 60 const EVP_MD *evp_md, 61 struct _krb5_key_data *key, 62 const void *data, 63 size_t len, 64 Checksum *cksum) 65 { 66 struct _krb5_evp_schedule *ctx = key->schedule->data; 67 EVP_MD_CTX *m; 68 DES_cblock ivec; 69 unsigned char *p = cksum->checksum.data; 70 71 krb5_generate_random_block(p, 8); 72 73 m = EVP_MD_CTX_create(); 74 if (m == NULL) 75 return krb5_enomem(context); 76 77 EVP_DigestInit_ex(m, evp_md, NULL); 78 EVP_DigestUpdate(m, p, 8); 79 EVP_DigestUpdate(m, data, len); 80 EVP_DigestFinal_ex (m, p + 8, NULL); 81 EVP_MD_CTX_destroy(m); 82 memset_s (&ivec, sizeof(ivec), 0, sizeof(ivec)); 83 84 #if OPENSSL_VERSION_NUMBER < 0x10100000UL 85 ctx->ectx = malloc(sizeof(*ctx->ectx)); 86 EVP_CIPHER_CTX_init(ctx->ectx); 87 #else 88 ctx->ectx = EVP_CIPHER_CTX_new(); 89 #endif 90 91 EVP_CipherInit_ex(ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1); 92 EVP_Cipher(ctx->ectx, p, p, 24); 93 94 return 0; 95 } 96 97 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 98 _krb5_des_verify(krb5_context context, 99 const EVP_MD *evp_md, 100 struct _krb5_key_data *key, 101 const void *data, 102 size_t len, 103 Checksum *C) 104 { 105 struct _krb5_evp_schedule *ctx = key->schedule->data; 106 EVP_MD_CTX *m; 107 unsigned char tmp[24]; 108 unsigned char res[16]; 109 DES_cblock ivec; 110 krb5_error_code ret = 0; 111 112 m = EVP_MD_CTX_create(); 113 if (m == NULL) 114 return krb5_enomem(context); 115 116 memset_s (&ivec, sizeof(ivec), 0, sizeof(ivec)); 117 #if OPENSSL_VERSION_NUMBER < 0x10100000UL 118 ctx->dctx = malloc(sizeof(*ctx->dctx)); 119 EVP_CIPHER_CTX_init(ctx->dctx); 120 #else 121 ctx->dctx = EVP_CIPHER_CTX_new(); 122 #endif 123 EVP_CipherInit_ex(ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1); 124 EVP_Cipher(ctx->dctx, tmp, C->checksum.data, 24); 125 126 EVP_DigestInit_ex(m, evp_md, NULL); 127 EVP_DigestUpdate(m, tmp, 8); /* confounder */ 128 EVP_DigestUpdate(m, data, len); 129 EVP_DigestFinal_ex (m, res, NULL); 130 EVP_MD_CTX_destroy(m); 131 if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) { 132 krb5_clear_error_message (context); 133 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 134 } 135 memset_s (tmp, sizeof(tmp), 0, sizeof(tmp)); 136 memset_s (res, sizeof(res), 0, sizeof(res)); 137 return ret; 138 } 139 140 #endif 141 142 static krb5_error_code 143 RSA_MD5_checksum(krb5_context context, 144 struct _krb5_key_data *key, 145 const void *data, 146 size_t len, 147 unsigned usage, 148 Checksum *C) 149 { 150 if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1) 151 krb5_abortx(context, "md5 checksum failed"); 152 return 0; 153 } 154 155 struct _krb5_checksum_type _krb5_checksum_rsa_md5 = { 156 CKSUMTYPE_RSA_MD5, 157 "rsa-md5", 158 64, 159 16, 160 F_CPROOF, 161 RSA_MD5_checksum, 162 NULL 163 }; 164