diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/libutil/crypt-md5.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/libutil/crypt-md5.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/libutil/crypt-md5.c b/contrib/syslinux-4.02/com32/libutil/crypt-md5.c new file mode 100644 index 0000000..49e9532 --- /dev/null +++ b/contrib/syslinux-4.02/com32/libutil/crypt-md5.c @@ -0,0 +1,173 @@ +/*- + * Copyright (c) 2003 Poul-Henning Kamp + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <inttypes.h> +#include <md5.h> +#include <string.h> + +/* + * UNIX password + */ + +static char *_crypt_to64(char *s, uint32_t v, int n) +{ + static const char itoa64[64] = "./0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + + while (--n >= 0) { + *s++ = itoa64[v & 0x3f]; + v >>= 6; + } + return s; +} + +char *crypt_md5(const char *pw, const char *salt) +{ + MD5_CTX ctx, ctx1; + unsigned long l; + int sl, pl; + uint32_t i; + uint8_t final[MD5_SIZE]; + const char *sp; + static char passwd[120]; /* Output buffer */ + static const char magic[] = "$1$"; + char *p; + const int magic_len = sizeof magic - 1; + int pwlen = strlen(pw); + + /* Refine the Salt first */ + sp = salt; + + /* If it starts with the magic string, then skip that */ + if (!strncmp(sp, magic, magic_len)) + sp += magic_len; + + /* Compute the salt length: + it stops at the first '$', max 8 chars */ + for (sl = 0; sl < 8 && sp[sl] && sp[sl] != '$'; sl++) ; + + MD5Init(&ctx); + + /* The password first, since that is what is most unknown */ + MD5Update(&ctx, pw, pwlen); + + /* Then our magic string */ + MD5Update(&ctx, magic, magic_len); + + /* Then the raw salt */ + MD5Update(&ctx, sp, sl); + + /* Then just as many characters of the MD5(pw,salt,pw) */ + MD5Init(&ctx1); + MD5Update(&ctx1, pw, pwlen); + MD5Update(&ctx1, sp, sl); + MD5Update(&ctx1, pw, pwlen); + MD5Final(final, &ctx1); + for (pl = pwlen; pl > 0; pl -= MD5_SIZE) + MD5Update(&ctx, final, pl > MD5_SIZE ? MD5_SIZE : pl); + + /* Don't leave anything around in vm they could use. */ + memset(final, 0, sizeof final); + + /* Then something really weird... */ + for (i = pwlen; i; i >>= 1) + if (i & 1) + MD5Update(&ctx, final, 1); + else + MD5Update(&ctx, pw, 1); + + /* Now make the output string */ + p = passwd; + + memcpy(p, magic, magic_len); + p += magic_len; + + memcpy(p, sp, sl); + p += sl; + + *p++ = '$'; + + MD5Final(final, &ctx); + + /* + * and now, just to make sure things don't run too fast + * On a 60 Mhz Pentium this takes 34 msec, so you would + * need 30 seconds to build a 1000 entry dictionary... + */ + for (i = 0; i < 1000; i++) { + MD5Init(&ctx1); + if (i & 1) + MD5Update(&ctx1, pw, pwlen); + else + MD5Update(&ctx1, final, MD5_SIZE); + + if (i % 3) + MD5Update(&ctx1, sp, sl); + + if (i % 7) + MD5Update(&ctx1, pw, pwlen); + + if (i & 1) + MD5Update(&ctx1, final, MD5_SIZE); + else + MD5Update(&ctx1, pw, pwlen); + MD5Final(final, &ctx1); + } + + l = (final[0] << 16) | (final[6] << 8) | final[12]; + p = _crypt_to64(p, l, 4); + l = (final[1] << 16) | (final[7] << 8) | final[13]; + p = _crypt_to64(p, l, 4); + l = (final[2] << 16) | (final[8] << 8) | final[14]; + p = _crypt_to64(p, l, 4); + l = (final[3] << 16) | (final[9] << 8) | final[15]; + p = _crypt_to64(p, l, 4); + l = (final[4] << 16) | (final[10] << 8) | final[5]; + p = _crypt_to64(p, l, 4); + l = final[11]; + p = _crypt_to64(p, l, 2); + *p = '\0'; + + /* Don't leave anything around in vm they could use. */ + memset(final, 0, sizeof final); + + return passwd; +} + +#ifdef TEST +#include <stdio.h> + +int main(int argc, char *argv[]) +{ + int i; + + for (i = 2; i < argc; i += 2) { + puts(crypt_md5(argv[i], argv[i - 1])); + } + return 0; +} + +#endif |