Annotation of src/lib/libcrypt/md5crypt.c, Revision 1.8
1.8 ! sjg 1: /* $NetBSD: md5crypt.c,v 1.7 2003/08/06 08:37:19 jdolecek Exp $ */
1.1 ad 2:
3: /*
4: * ----------------------------------------------------------------------------
5: * "THE BEER-WARE LICENSE" (Revision 42):
6: * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
7: * can do whatever you want with this stuff. If we meet some day, and you think
8: * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
9: * ----------------------------------------------------------------------------
10: *
11: * from FreeBSD: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp
12: * via OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp
13: *
14: */
15:
16: #include <sys/cdefs.h>
17: #if !defined(lint)
1.8 ! sjg 18: __RCSID("$NetBSD: md5crypt.c,v 1.7 2003/08/06 08:37:19 jdolecek Exp $");
1.1 ad 19: #endif /* not lint */
20:
1.5 thorpej 21: /*
22: * NOTE: We are also built for inclusion in libcrypto; when built for that
23: * environment, use the libcrypto versions of the MD5 routines, so save
24: * having to pull two versions into the same program.
25: */
26:
1.1 ad 27: #include <unistd.h>
28: #include <stdio.h>
29: #include <string.h>
1.5 thorpej 30: #ifdef libcrypto
31: #include <openssl/md5.h>
32: #else
1.1 ad 33: #include <md5.h>
1.5 thorpej 34: #endif
1.1 ad 35: #include <string.h>
36:
1.8 ! sjg 37: #include "crypt.h"
! 38:
1.1 ad 39: #define MD5_MAGIC "$1$"
40: #define MD5_MAGIC_LEN 3
41:
1.5 thorpej 42: #ifdef libcrypto
43: #define INIT(x) MD5_Init((x))
44: #define UPDATE(x, b, l) MD5_Update((x), (b), (l))
45: #define FINAL(v, x) MD5_Final((v), (x))
46: #else
47: #define INIT(x) MD5Init((x))
48: #define UPDATE(x, b, l) MD5Update((x), (b), (l))
49: #define FINAL(v, x) MD5Final((v), (x))
50: #endif
1.1 ad 51:
52:
53: /*
54: * MD5 password encryption.
55: */
56: char *
57: __md5crypt(const char *pw, const char *salt)
58: {
59: static char passwd[120], *p;
60: const char *sp, *ep;
61: unsigned char final[16];
62: unsigned int i, sl, pwl;
63: MD5_CTX ctx, ctx1;
64: u_int32_t l;
65: int pl;
66:
67: pwl = strlen(pw);
68:
69: /* Refine the salt first */
70: sp = salt;
71:
72: /* If it starts with the magic string, then skip that */
1.2 ad 73: if (strncmp(sp, MD5_MAGIC, MD5_MAGIC_LEN) == 0)
1.1 ad 74: sp += MD5_MAGIC_LEN;
75:
76: /* It stops at the first '$', max 8 chars */
1.2 ad 77: for (ep = sp; *ep != '\0' && *ep != '$' && ep < (sp + 8); ep++)
1.1 ad 78: continue;
79:
80: /* get the length of the true salt */
81: sl = ep - sp;
82:
1.5 thorpej 83: INIT(&ctx);
1.1 ad 84:
85: /* The password first, since that is what is most unknown */
1.5 thorpej 86: UPDATE(&ctx, (const unsigned char *)pw, pwl);
1.1 ad 87:
88: /* Then our magic string */
1.5 thorpej 89: UPDATE(&ctx, (const unsigned char *)MD5_MAGIC, MD5_MAGIC_LEN);
1.1 ad 90:
91: /* Then the raw salt */
1.5 thorpej 92: UPDATE(&ctx, (const unsigned char *)sp, sl);
1.1 ad 93:
94: /* Then just as many characters of the MD5(pw,salt,pw) */
1.5 thorpej 95: INIT(&ctx1);
96: UPDATE(&ctx1, (const unsigned char *)pw, pwl);
97: UPDATE(&ctx1, (const unsigned char *)sp, sl);
98: UPDATE(&ctx1, (const unsigned char *)pw, pwl);
99: FINAL(final, &ctx1);
1.1 ad 100:
1.2 ad 101: for (pl = pwl; pl > 0; pl -= 16)
1.5 thorpej 102: UPDATE(&ctx, final, (unsigned int)(pl > 16 ? 16 : pl));
1.1 ad 103:
104: /* Don't leave anything around in vm they could use. */
105: memset(final, 0, sizeof(final));
106:
107: /* Then something really weird... */
108: for (i = pwl; i != 0; i >>= 1)
1.2 ad 109: if ((i & 1) != 0)
1.5 thorpej 110: UPDATE(&ctx, final, 1);
1.1 ad 111: else
1.5 thorpej 112: UPDATE(&ctx, (const unsigned char *)pw, 1);
1.1 ad 113:
114: /* Now make the output string */
115: memcpy(passwd, MD5_MAGIC, MD5_MAGIC_LEN);
1.4 ad 116: strlcpy(passwd + MD5_MAGIC_LEN, sp, sl + 1);
1.6 itojun 117: strlcat(passwd, "$", sizeof(passwd));
1.1 ad 118:
1.5 thorpej 119: FINAL(final, &ctx);
1.1 ad 120:
121: /*
122: * And now, just to make sure things don't run too fast. On a 60 MHz
123: * Pentium this takes 34 msec, so you would need 30 seconds to build
124: * a 1000 entry dictionary...
125: */
1.2 ad 126: for (i = 0; i < 1000; i++) {
1.5 thorpej 127: INIT(&ctx1);
1.1 ad 128:
1.2 ad 129: if ((i & 1) != 0)
1.5 thorpej 130: UPDATE(&ctx1, (const unsigned char *)pw, pwl);
1.1 ad 131: else
1.5 thorpej 132: UPDATE(&ctx1, final, 16);
1.1 ad 133:
1.2 ad 134: if ((i % 3) != 0)
1.5 thorpej 135: UPDATE(&ctx1, (const unsigned char *)sp, sl);
1.1 ad 136:
1.2 ad 137: if ((i % 7) != 0)
1.5 thorpej 138: UPDATE(&ctx1, (const unsigned char *)pw, pwl);
1.1 ad 139:
1.2 ad 140: if ((i & 1) != 0)
1.5 thorpej 141: UPDATE(&ctx1, final, 16);
1.1 ad 142: else
1.5 thorpej 143: UPDATE(&ctx1, (const unsigned char *)pw, pwl);
1.1 ad 144:
1.5 thorpej 145: FINAL(final, &ctx1);
1.1 ad 146: }
147:
148: p = passwd + sl + MD5_MAGIC_LEN + 1;
149:
1.8 ! sjg 150: l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; __crypt_to64(p,l,4); p += 4;
! 151: l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; __crypt_to64(p,l,4); p += 4;
! 152: l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; __crypt_to64(p,l,4); p += 4;
! 153: l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; __crypt_to64(p,l,4); p += 4;
! 154: l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; __crypt_to64(p,l,4); p += 4;
! 155: l = final[11] ; __crypt_to64(p,l,2); p += 2;
1.1 ad 156: *p = '\0';
157:
158: /* Don't leave anything around in vm they could use. */
159: memset(final, 0, sizeof(final));
160: return (passwd);
161: }
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