Contents of /trunk/mkinitrd-magellan/busybox/libbb/pw_encrypt.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2814 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | |
12 | /* static const uint8_t ascii64[] = |
13 | * "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
14 | */ |
15 | |
16 | static int i64c(int i) |
17 | { |
18 | i &= 0x3f; |
19 | if (i == 0) |
20 | return '.'; |
21 | if (i == 1) |
22 | return '/'; |
23 | if (i < 12) |
24 | return ('0' - 2 + i); |
25 | if (i < 38) |
26 | return ('A' - 12 + i); |
27 | return ('a' - 38 + i); |
28 | } |
29 | |
30 | int FAST_FUNC crypt_make_salt(char *p, int cnt, int x) |
31 | { |
32 | x += getpid() + time(NULL); |
33 | do { |
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 */ |
43 | *p++ = i64c(x >> 16); |
44 | *p++ = i64c(x >> 22); |
45 | } while (--cnt); |
46 | *p = '\0'; |
47 | return x; |
48 | } |
49 | |
50 | #if ENABLE_USE_BB_CRYPT |
51 | |
52 | static char* |
53 | to64(char *s, unsigned v, int n) |
54 | { |
55 | while (--n >= 0) { |
56 | /* *s++ = ascii64[v & 0x3f]; */ |
57 | *s++ = i64c(v); |
58 | v >>= 6; |
59 | } |
60 | return s; |
61 | } |
62 | |
63 | /* |
64 | * DES and MD5 crypt implementations are taken from uclibc. |
65 | * They were modified to not use static buffers. |
66 | */ |
67 | |
68 | #include "pw_encrypt_des.c" |
69 | #include "pw_encrypt_md5.c" |
70 | #if ENABLE_USE_BB_CRYPT_SHA |
71 | #include "pw_encrypt_sha.c" |
72 | #endif |
73 | |
74 | /* Other advanced crypt ids (TODO?): */ |
75 | /* $2$ or $2a$: Blowfish */ |
76 | |
77 | static struct const_des_ctx *des_cctx; |
78 | static struct des_ctx *des_ctx; |
79 | |
80 | /* my_crypt returns malloc'ed data */ |
81 | static char *my_crypt(const char *key, const char *salt) |
82 | { |
83 | /* MD5 or SHA? */ |
84 | if (salt[0] == '$' && salt[1] && salt[2] == '$') { |
85 | if (salt[1] == '1') |
86 | return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt); |
87 | #if ENABLE_USE_BB_CRYPT_SHA |
88 | if (salt[1] == '5' || salt[1] == '6') |
89 | return sha_crypt((char*)key, (char*)salt); |
90 | #endif |
91 | } |
92 | |
93 | if (!des_cctx) |
94 | des_cctx = const_des_init(); |
95 | des_ctx = des_init(des_ctx, des_cctx); |
96 | return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt); |
97 | } |
98 | |
99 | /* So far nobody wants to have it public */ |
100 | static void my_crypt_cleanup(void) |
101 | { |
102 | free(des_cctx); |
103 | free(des_ctx); |
104 | des_cctx = NULL; |
105 | des_ctx = NULL; |
106 | } |
107 | |
108 | char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup) |
109 | { |
110 | char *encrypted; |
111 | |
112 | encrypted = my_crypt(clear, salt); |
113 | |
114 | if (cleanup) |
115 | my_crypt_cleanup(); |
116 | |
117 | return encrypted; |
118 | } |
119 | |
120 | #else /* if !ENABLE_USE_BB_CRYPT */ |
121 | |
122 | char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup) |
123 | { |
124 | return xstrdup(crypt(clear, salt)); |
125 | } |
126 | |
127 | #endif |