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157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD: src/lib/libcrypt/crypt-md5.c,v 1.5 1999/12/17 20:21:45 peter Exp $
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*
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*/
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/* $Id: crypt-md5.c,v 1.1 2001/08/21 01:32:01 momjian Exp $ */
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#include <postgres.h>
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#include "px.h"
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#include "px-crypt.h"
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#define MD5_SIZE 16
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/*
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* UNIX password
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*/
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char *
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px_crypt_md5(const char *pw, const char *salt, char *passwd, unsigned dstlen)
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{
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static char *magic = "$1$"; /*
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* This string is magic for
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* this algorithm. Having
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* it this way, we can get
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* get better later on
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*/
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static char *p;
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static const char *sp,
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*ep;
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unsigned char final[MD5_SIZE];
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int sl,
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pl,
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i;
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PX_MD *ctx,
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*ctx1;
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int err;
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unsigned long l;
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if (!passwd || dstlen < 120)
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return NULL;
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/* Refine the Salt first */
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sp = salt;
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/* If it starts with the magic string, then skip that */
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if (!strncmp(sp, magic, strlen(magic)))
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sp += strlen(magic);
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/* It stops at the first '$', max 8 chars */
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for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
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continue;
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/* get the length of the true salt */
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sl = ep - sp;
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/* */
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err = px_find_digest("md5", &ctx);
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if (err)
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return NULL;
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err = px_find_digest("md5", &ctx1);
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/* The password first, since that is what is most unknown */
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px_md_update(ctx, pw, strlen(pw));
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/* Then our magic string */
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px_md_update(ctx, magic, strlen(magic));
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/* Then the raw salt */
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px_md_update(ctx, sp, sl);
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/* Then just as many characters of the MD5(pw,salt,pw) */
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px_md_update(ctx1, pw, strlen(pw));
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px_md_update(ctx1, sp, sl);
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px_md_update(ctx1, pw, strlen(pw));
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px_md_finish(ctx1, final);
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for (pl = strlen(pw); pl > 0; pl -= MD5_SIZE)
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px_md_update(ctx, final, pl > MD5_SIZE ? MD5_SIZE : pl);
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/* Don't leave anything around in vm they could use. */
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memset(final, 0, sizeof final);
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/* Then something really weird... */
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for (i = strlen(pw); i; i >>= 1)
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if (i & 1)
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px_md_update(ctx, final, 1);
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else
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px_md_update(ctx, pw, 1);
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/* Now make the output string */
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strcpy(passwd, magic);
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strncat(passwd, sp, sl);
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strcat(passwd, "$");
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px_md_finish(ctx, final);
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/*
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* and now, just to make sure things don't run too fast
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* On a 60 Mhz Pentium this takes 34 msec, so you would
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* need 30 seconds to build a 1000 entry dictionary...
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*/
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for (i = 0; i < 1000; i++)
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{
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px_md_reset(ctx1);
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if (i & 1)
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px_md_update(ctx1, pw, strlen(pw));
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else
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px_md_update(ctx1, final, MD5_SIZE);
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if (i % 3)
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px_md_update(ctx1, sp, sl);
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if (i % 7)
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px_md_update(ctx1, pw, strlen(pw));
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if (i & 1)
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px_md_update(ctx1, final, MD5_SIZE);
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else
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px_md_update(ctx1, pw, strlen(pw));
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px_md_finish(ctx1, final);
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}
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p = passwd + strlen(passwd);
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l = (final[0] << 16) | (final[6] << 8) | final[12];
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_crypt_to64(p, l, 4);
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p += 4;
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l = (final[1] << 16) | (final[7] << 8) | final[13];
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_crypt_to64(p, l, 4);
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p += 4;
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l = (final[2] << 16) | (final[8] << 8) | final[14];
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_crypt_to64(p, l, 4);
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p += 4;
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l = (final[3] << 16) | (final[9] << 8) | final[15];
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_crypt_to64(p, l, 4);
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p += 4;
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l = (final[4] << 16) | (final[10] << 8) | final[5];
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_crypt_to64(p, l, 4);
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p += 4;
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l = final[11];
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_crypt_to64(p, l, 2);
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p += 2;
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*p = '\0';
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/* Don't leave anything around in vm they could use. */
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memset(final, 0, sizeof final);
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px_md_free(ctx1);
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px_md_free(ctx);
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return passwd;
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}
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