md5crypt.c revision 1.4.2.2
1 1.4.2.2 he /* $NetBSD: md5crypt.c,v 1.4.2.2 2002/01/22 19:31:59 he Exp $ */ 2 1.4.2.2 he 3 1.4.2.2 he /* 4 1.4.2.2 he * ---------------------------------------------------------------------------- 5 1.4.2.2 he * "THE BEER-WARE LICENSE" (Revision 42): 6 1.4.2.2 he * <phk (at) login.dknet.dk> wrote this file. As long as you retain this notice you 7 1.4.2.2 he * can do whatever you want with this stuff. If we meet some day, and you think 8 1.4.2.2 he * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 9 1.4.2.2 he * ---------------------------------------------------------------------------- 10 1.4.2.2 he * 11 1.4.2.2 he * from FreeBSD: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp 12 1.4.2.2 he * via OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp 13 1.4.2.2 he * 14 1.4.2.2 he */ 15 1.4.2.2 he 16 1.4.2.2 he #include <sys/cdefs.h> 17 1.4.2.2 he #if !defined(lint) 18 1.4.2.2 he __RCSID("$NetBSD: md5crypt.c,v 1.4.2.2 2002/01/22 19:31:59 he Exp $"); 19 1.4.2.2 he #endif /* not lint */ 20 1.4.2.2 he 21 1.4.2.2 he #include <unistd.h> 22 1.4.2.2 he #include <stdio.h> 23 1.4.2.2 he #include <string.h> 24 1.4.2.2 he #include <md5.h> 25 1.4.2.2 he #include <string.h> 26 1.4.2.2 he 27 1.4.2.2 he #define MD5_MAGIC "$1$" 28 1.4.2.2 he #define MD5_MAGIC_LEN 3 29 1.4.2.2 he 30 1.4.2.2 he char *__md5crypt(const char *pw, const char *salt); /* XXX */ 31 1.4.2.2 he 32 1.4.2.2 he static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */ 33 1.4.2.2 he "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 34 1.4.2.2 he 35 1.4.2.2 he static void to64(char *, u_int32_t, int); 36 1.4.2.2 he 37 1.4.2.2 he static void 38 1.4.2.2 he to64(char *s, u_int32_t v, int n) 39 1.4.2.2 he { 40 1.4.2.2 he 41 1.4.2.2 he while (--n >= 0) { 42 1.4.2.2 he *s++ = itoa64[v & 0x3f]; 43 1.4.2.2 he v >>= 6; 44 1.4.2.2 he } 45 1.4.2.2 he } 46 1.4.2.2 he 47 1.4.2.2 he /* 48 1.4.2.2 he * MD5 password encryption. 49 1.4.2.2 he */ 50 1.4.2.2 he char * 51 1.4.2.2 he __md5crypt(const char *pw, const char *salt) 52 1.4.2.2 he { 53 1.4.2.2 he static char passwd[120], *p; 54 1.4.2.2 he const char *sp, *ep; 55 1.4.2.2 he unsigned char final[16]; 56 1.4.2.2 he unsigned int i, sl, pwl; 57 1.4.2.2 he MD5_CTX ctx, ctx1; 58 1.4.2.2 he u_int32_t l; 59 1.4.2.2 he int pl; 60 1.4.2.2 he 61 1.4.2.2 he pwl = strlen(pw); 62 1.4.2.2 he 63 1.4.2.2 he /* Refine the salt first */ 64 1.4.2.2 he sp = salt; 65 1.4.2.2 he 66 1.4.2.2 he /* If it starts with the magic string, then skip that */ 67 1.4.2.2 he if (strncmp(sp, MD5_MAGIC, MD5_MAGIC_LEN) == 0) 68 1.4.2.2 he sp += MD5_MAGIC_LEN; 69 1.4.2.2 he 70 1.4.2.2 he /* It stops at the first '$', max 8 chars */ 71 1.4.2.2 he for (ep = sp; *ep != '\0' && *ep != '$' && ep < (sp + 8); ep++) 72 1.4.2.2 he continue; 73 1.4.2.2 he 74 1.4.2.2 he /* get the length of the true salt */ 75 1.4.2.2 he sl = ep - sp; 76 1.4.2.2 he 77 1.4.2.2 he MD5Init(&ctx); 78 1.4.2.2 he 79 1.4.2.2 he /* The password first, since that is what is most unknown */ 80 1.4.2.2 he MD5Update(&ctx, (const unsigned char *)pw, pwl); 81 1.4.2.2 he 82 1.4.2.2 he /* Then our magic string */ 83 1.4.2.2 he MD5Update(&ctx, (const unsigned char *)MD5_MAGIC, MD5_MAGIC_LEN); 84 1.4.2.2 he 85 1.4.2.2 he /* Then the raw salt */ 86 1.4.2.2 he MD5Update(&ctx, (const unsigned char *)sp, sl); 87 1.4.2.2 he 88 1.4.2.2 he /* Then just as many characters of the MD5(pw,salt,pw) */ 89 1.4.2.2 he MD5Init(&ctx1); 90 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)pw, pwl); 91 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)sp, sl); 92 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)pw, pwl); 93 1.4.2.2 he MD5Final(final, &ctx1); 94 1.4.2.2 he 95 1.4.2.2 he for (pl = pwl; pl > 0; pl -= 16) 96 1.4.2.2 he MD5Update(&ctx, final, (unsigned int)(pl > 16 ? 16 : pl)); 97 1.4.2.2 he 98 1.4.2.2 he /* Don't leave anything around in vm they could use. */ 99 1.4.2.2 he memset(final, 0, sizeof(final)); 100 1.4.2.2 he 101 1.4.2.2 he /* Then something really weird... */ 102 1.4.2.2 he for (i = pwl; i != 0; i >>= 1) 103 1.4.2.2 he if ((i & 1) != 0) 104 1.4.2.2 he MD5Update(&ctx, final, 1); 105 1.4.2.2 he else 106 1.4.2.2 he MD5Update(&ctx, (const unsigned char *)pw, 1); 107 1.4.2.2 he 108 1.4.2.2 he /* Now make the output string */ 109 1.4.2.2 he memcpy(passwd, MD5_MAGIC, MD5_MAGIC_LEN); 110 1.4.2.2 he strlcpy(passwd + MD5_MAGIC_LEN, sp, sl + 1); 111 1.4.2.2 he strcat(passwd, "$"); 112 1.4.2.2 he 113 1.4.2.2 he MD5Final(final, &ctx); 114 1.4.2.2 he 115 1.4.2.2 he /* 116 1.4.2.2 he * And now, just to make sure things don't run too fast. On a 60 MHz 117 1.4.2.2 he * Pentium this takes 34 msec, so you would need 30 seconds to build 118 1.4.2.2 he * a 1000 entry dictionary... 119 1.4.2.2 he */ 120 1.4.2.2 he for (i = 0; i < 1000; i++) { 121 1.4.2.2 he MD5Init(&ctx1); 122 1.4.2.2 he 123 1.4.2.2 he if ((i & 1) != 0) 124 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)pw, pwl); 125 1.4.2.2 he else 126 1.4.2.2 he MD5Update(&ctx1, final, 16); 127 1.4.2.2 he 128 1.4.2.2 he if ((i % 3) != 0) 129 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)sp, sl); 130 1.4.2.2 he 131 1.4.2.2 he if ((i % 7) != 0) 132 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)pw, pwl); 133 1.4.2.2 he 134 1.4.2.2 he if ((i & 1) != 0) 135 1.4.2.2 he MD5Update(&ctx1, final, 16); 136 1.4.2.2 he else 137 1.4.2.2 he MD5Update(&ctx1, (const unsigned char *)pw, pwl); 138 1.4.2.2 he 139 1.4.2.2 he MD5Final(final, &ctx1); 140 1.4.2.2 he } 141 1.4.2.2 he 142 1.4.2.2 he p = passwd + sl + MD5_MAGIC_LEN + 1; 143 1.4.2.2 he 144 1.4.2.2 he l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4; 145 1.4.2.2 he l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4; 146 1.4.2.2 he l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4; 147 1.4.2.2 he l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4; 148 1.4.2.2 he l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4; 149 1.4.2.2 he l = final[11] ; to64(p,l,2); p += 2; 150 1.4.2.2 he *p = '\0'; 151 1.4.2.2 he 152 1.4.2.2 he /* Don't leave anything around in vm they could use. */ 153 1.4.2.2 he memset(final, 0, sizeof(final)); 154 1.4.2.2 he return (passwd); 155 1.4.2.2 he } 156
Indexes created Mon Sep 29 21:09:56 GMT 2025