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 <sha512.h> 39 #include "crypt.h" 40 41 /* 42 * New password crypt. 43 */ 44 45 char* 46 crypt_sha512(const char *pw, const char *salt) 47 { 48 static const char *magic = "$4$"; /* Magic string for this 49 * algorithm. Easier to change 50 * when factored as constant. 51 */ 52 static char passwd[120], *p; 53 static const char *sp, *ep; 54 unsigned char final[SHA512_SIZE]; 55 int sl, i; 56 SHA512_CTX ctx; 57 unsigned long l; 58 59 /* Refine the salt. */ 60 sp = salt; 61 62 /* If it starts with the magic string, then skip that. */ 63 if (!strncmp(sp, magic, strlen(magic))) 64 sp += strlen(magic); 65 66 /* Stop at the first '$', max 8 chars. */ 67 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++) 68 continue; 69 70 /* Get the actual salt length. */ 71 sl = ep - sp; 72 73 SHA512_Init(&ctx); 74 75 /* Hash in the password first. */ 76 SHA512_Update(&ctx, pw, strlen(pw)); 77 78 /* Then the magic string */ 79 SHA512_Update(&ctx, magic, sizeof(magic)); 80 81 /* Then the raw salt. */ 82 SHA512_Update(&ctx, sp, sl); 83 84 /* Finish and create the output string. */ 85 SHA512_Final(final, &ctx); 86 strcpy(passwd, magic); 87 strncat(passwd, sp, sl); 88 strcat(passwd, "$"); 89 90 p = passwd + strlen(passwd); 91 92 /* 93 * For-loop form of the algorithm in sha256.c; 94 * breaks the final output up into 3cols and then base64's each row. 95 */ 96 for (i = 0; i < 20; i++) { 97 l = (final[i] << 16) | (final[i + 21] << 8) | final[i + 42]; 98 _crypt_to64(p, l, 4); p += 4; 99 } 100 l = (final[20] << 16) | (final[41] << 8); 101 _crypt_to64(p, l, 4); p += 4; 102 *p = '\0'; 103 104 /* Clear memory. */ 105 memset(final, 0, sizeof(final)); 106 107 return (passwd); 108 } 109