1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 /* static const uint8_t ascii64[] ALIGN1 =
12 * "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
15 static int i64c(int i)
25 return ('A' - 12 + i);
26 return ('a' - 38 + i);
29 int FAST_FUNC crypt_make_salt(char *p, int cnt /*, int x */)
32 unsigned x = getpid() + monotonic_us();
34 /* x = (x*1664525 + 1013904223) % 2^32 generator is lame
35 * (low-order bit is not "random", etc...),
36 * but for our purposes it is good enough */
37 x = x*1664525 + 1013904223;
38 /* BTW, Park and Miller's "minimal standard generator" is
39 * x = x*16807 % ((2^31)-1)
40 * It has no problem with visibly alternating lowest bit
41 * but is also weak in cryptographic sense + needs div,
42 * which needs more code (and slower) on many CPUs */
50 char* FAST_FUNC crypt_make_pw_salt(char salt[MAX_PW_SALT_LEN], const char *algo)
53 char *salt_ptr = salt;
55 /* Standard chpasswd uses uppercase algos ("MD5", not "md5").
56 * Need to be case-insensitive in the code below.
58 if ((algo[0]|0x20) != 'd') { /* not des */
59 len = 8/2; /* so far assuming md5 */
63 #if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
64 if ((algo[0]|0x20) == 's') { /* sha */
65 salt[1] = '5' + (strcasecmp(algo, "sha512") == 0);
70 crypt_make_salt(salt_ptr, len);
74 #if ENABLE_USE_BB_CRYPT
77 to64(char *s, unsigned v, int n)
80 /* *s++ = ascii64[v & 0x3f]; */
88 * DES and MD5 crypt implementations are taken from uclibc.
89 * They were modified to not use static buffers.
92 #include "pw_encrypt_des.c"
93 #include "pw_encrypt_md5.c"
94 #if ENABLE_USE_BB_CRYPT_SHA
95 #include "pw_encrypt_sha.c"
98 /* Other advanced crypt ids (TODO?): */
99 /* $2$ or $2a$: Blowfish */
101 static struct const_des_ctx *des_cctx;
102 static struct des_ctx *des_ctx;
104 /* my_crypt returns malloc'ed data */
105 static char *my_crypt(const char *key, const char *salt)
108 if (salt[0] == '$' && salt[1] && salt[2] == '$') {
110 return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
111 #if ENABLE_USE_BB_CRYPT_SHA
112 if (salt[1] == '5' || salt[1] == '6')
113 return sha_crypt((char*)key, (char*)salt);
118 des_cctx = const_des_init();
119 des_ctx = des_init(des_ctx, des_cctx);
120 return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
123 /* So far nobody wants to have it public */
124 static void my_crypt_cleanup(void)
132 char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
136 encrypted = my_crypt(clear, salt);
144 #else /* if !ENABLE_USE_BB_CRYPT */
146 char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
150 s = crypt(clear, salt);
152 * glibc used to return "" on malformed salts (for example, ""),
153 * but since 2.17 it returns NULL.
155 return xstrdup(s ? s : "");