1 /* 2 * Copyright (c) 2010 3 * The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Nolan Lum <nol888@gmail.com> 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 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <string.h> 38 #include <sha256.h> 39 #include "crypt.h" 40 41 /* 42 * New password crypt. 43 */ 44 45 #define SHA256_SIZE 32 46 47 char* 48 crypt_deprecated_sha256(const char *pw, const char *salt) 49 { 50 static const char *magic = "$3$"; /* Magic string for this 51 * algorithm. Easier to change 52 * when factored as constant. 53 */ 54 static char passwd[120], *p; 55 static const char *sp, *ep; 56 unsigned char final[SHA256_SIZE]; 57 int sl; 58 SHA256_CTX ctx; 59 unsigned long l; 60 61 /* Refine the salt. */ 62 sp = salt; 63 64 /* If it starts with the magic string, then skip that. */ 65 if (!strncmp(sp, magic, strlen(magic))) 66 sp += strlen(magic); 67 68 /* Stop at the first '$', max 8 chars. */ 69 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++) 70 continue; 71 72 /* Get the actual salt length. */ 73 sl = ep - sp; 74 75 SHA256_Init(&ctx); 76 77 /* Hash in the password first. */ 78 SHA256_Update(&ctx, pw, strlen(pw)); 79 80 /* Then the magic string */ 81 SHA256_Update(&ctx, magic, sizeof(magic)); 82 83 /* Then the raw salt. */ 84 SHA256_Update(&ctx, sp, sl); 85 86 /* Finish and create the output string. */ 87 SHA256_Final(final, &ctx); 88 strcpy(passwd, magic); 89 strncat(passwd, sp, sl); 90 strcat(passwd, "$"); 91 92 p = passwd + strlen(passwd); 93 94 l = (final[ 0] << 16) | (final[11] << 8) | final[21]; 95 _crypt_to64(p, l, 4); p += 4; 96 l = (final[ 1] << 16) | (final[12] << 8) | final[22]; 97 _crypt_to64(p, l, 4); p += 4; 98 l = (final[ 2] << 16) | (final[13] << 8) | final[23]; 99 _crypt_to64(p, l, 4); p += 4; 100 l = (final[ 3] << 16) | (final[14] << 8) | final[24]; 101 _crypt_to64(p, l, 4); p += 4; 102 l = (final[ 4] << 16) | (final[15] << 8) | final[25]; 103 _crypt_to64(p, l, 4); p += 4; 104 l = (final[ 5] << 16) | (final[16] << 8) | final[26]; 105 _crypt_to64(p, l, 4); p += 4; 106 l = (final[ 6] << 16) | (final[17] << 8) | final[27]; 107 _crypt_to64(p, l, 4); p += 4; 108 l = (final[ 7] << 16) | (final[18] << 8) | final[28]; 109 _crypt_to64(p, l, 4); p += 4; 110 l = (final[ 8] << 16) | (final[19] << 8) | final[29]; 111 _crypt_to64(p, l, 4); p += 4; 112 l = (final[ 9] << 16) | (final[20] << 8) | final[30]; 113 _crypt_to64(p, l, 4); p += 4; 114 l = (final[10] << 16) | (final[31] << 8); 115 _crypt_to64(p, l, 4); p += 4; 116 *p = '\0'; 117 118 /* Clear memory. */ 119 memset(final, 0, sizeof(final)); 120 121 return (passwd); 122 } 123