1 /* $OpenBSD: des3.c,v 1.10 2021/12/13 16:56:49 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Markus Friedl. 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 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <openssl/des.h> 28 #include <err.h> 29 #include <fcntl.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <unistd.h> 34 35 /* Stubs */ 36 37 u_int32_t deflate_global(u_int8_t *, u_int32_t, int, u_int8_t **); 38 39 u_int32_t 40 deflate_global(u_int8_t *data, u_int32_t size, int comp, u_int8_t **out) 41 { 42 return 0; 43 } 44 45 void explicit_bzero(void *, size_t); 46 47 void 48 explicit_bzero(void *b, size_t len) 49 { 50 bzero(b, len); 51 } 52 53 54 /* Simulate CBC mode */ 55 56 static int 57 docrypt(const unsigned char *key, size_t klen, const unsigned char *iv0, 58 const unsigned char *in, unsigned char *out, size_t len, int encrypt) 59 { 60 u_int8_t block[8], iv[8], iv2[8], *ivp = iv, *nivp; 61 u_int8_t ctx[384]; 62 int i, j, error = 0; 63 64 memcpy(iv, iv0, 8); 65 memset(ctx, 0, sizeof(ctx)); 66 error = des3_setkey(ctx, key, klen); 67 if (error) 68 return -1; 69 for (i = 0; i < len / 8; i ++) { 70 bcopy(in, block, 8); 71 in += 8; 72 if (encrypt) { 73 for (j = 0; j < 8; j++) 74 block[j] ^= ivp[j]; 75 des3_encrypt(ctx, block); 76 memcpy(ivp, block, 8); 77 } else { 78 nivp = ivp == iv ? iv2 : iv; 79 memcpy(nivp, block, 8); 80 des3_decrypt(ctx, block); 81 for (j = 0; j < 8; j++) 82 block[j] ^= ivp[j]; 83 ivp = nivp; 84 } 85 bcopy(block, out, 8); 86 out += 8; 87 } 88 return 0; 89 } 90 91 static int 92 match(unsigned char *a, unsigned char *b, size_t len) 93 { 94 int i; 95 96 if (memcmp(a, b, len) == 0) 97 return (1); 98 99 warnx("decrypt/plaintext mismatch"); 100 101 for (i = 0; i < len; i++) 102 printf("%2.2x", a[i]); 103 printf("\n"); 104 for (i = 0; i < len; i++) 105 printf("%2.2x", b[i]); 106 printf("\n"); 107 108 return (0); 109 } 110 111 #define SZ 16 112 113 int 114 main(int argc, char **argv) 115 { 116 DES_key_schedule ks1, ks2, ks3; 117 unsigned char iv0[8], iv[8], key[24] = "012345670123456701234567"; 118 unsigned char b1[SZ], b2[SZ]; 119 int i, fail = 0; 120 u_int32_t rand = 0; 121 122 /* setup data and iv */ 123 for (i = 0; i < sizeof(b1); i++ ) { 124 if (i % 4 == 0) 125 rand = arc4random(); 126 b1[i] = rand; 127 rand >>= 8; 128 } 129 for (i = 0; i < sizeof(iv0); i++ ) { 130 if (i % 4 == 0) 131 rand = arc4random(); 132 iv0[i] = rand; 133 rand >>= 8; 134 } 135 memset(b2, 0, sizeof(b2)); 136 137 /* keysetup for software */ 138 DES_set_key((void *) key, &ks1); 139 DES_set_key((void *) (key+8), &ks2); 140 DES_set_key((void *) (key+16), &ks3); 141 142 /* encrypt with software, decrypt with /dev/crypto */ 143 memcpy(iv, iv0, sizeof(iv0)); 144 DES_ede3_cbc_encrypt((void *)b1, (void*)b2, sizeof(b1), &ks1, &ks2, 145 &ks3, (void*)iv, DES_ENCRYPT); 146 memcpy(iv, iv0, sizeof(iv0)); 147 if (docrypt(key, sizeof(key), iv, b2, b2, sizeof(b1), 0) < 0) { 148 warnx("decryption failed"); 149 fail++; 150 } 151 if (!match(b1, b2, sizeof(b1))) 152 fail++; 153 else 154 printf("ok, decrypted\n"); 155 156 /* encrypt with kernel functions, decrypt with openssl */ 157 memset(b2, 0, sizeof(b2)); 158 memcpy(iv, iv0, sizeof(iv0)); 159 if (docrypt(key, sizeof(key), iv, b1, b2, sizeof(b1), 1) < 0) { 160 warnx("encryption failed"); 161 fail++; 162 } 163 memcpy(iv, iv0, sizeof(iv0)); 164 DES_ede3_cbc_encrypt((void *)b2, (void*)b2, sizeof(b1), &ks1, &ks2, 165 &ks3, (void*)iv, DES_DECRYPT); 166 if (!match(b1, b2, sizeof(b1))) 167 fail++; 168 else 169 printf("ok, encrypted\n"); 170 171 exit((fail > 0) ? 1 : 0); 172 } 173