| /* |
| * File imported from FreeBSD, original by Poul-Henning Kamp. |
| * |
| * $FreeBSD: src/lib/libcrypt/crypt-md5.c,v 1.5 1999/12/17 20:21:45 peter Exp $ |
| * |
| * contrib/pgcrypto/crypt-md5.c |
| */ |
| |
| #include "postgres.h" |
| |
| #include "px.h" |
| #include "px-crypt.h" |
| |
| #define MD5_SIZE 16 |
| |
| static const char _crypt_a64[] = |
| "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
| |
| static void |
| _crypt_to64(char *s, unsigned long v, int n) |
| { |
| while (--n >= 0) |
| { |
| *s++ = _crypt_a64[v & 0x3f]; |
| v >>= 6; |
| } |
| } |
| |
| /* |
| * UNIX password |
| */ |
| |
| char * |
| px_crypt_md5(const char *pw, const char *salt, char *passwd, unsigned dstlen) |
| { |
| static char *magic = "$1$"; /* This string is magic for this algorithm. |
| * Having it this way, we can get better |
| * later on */ |
| static char *p; |
| static const char *sp, |
| *ep; |
| unsigned char final[MD5_SIZE]; |
| int sl, |
| pl, |
| i; |
| PX_MD *ctx, |
| *ctx1; |
| int err; |
| unsigned long l; |
| |
| if (!passwd || dstlen < 120) |
| return NULL; |
| |
| /* Refine the Salt first */ |
| sp = salt; |
| |
| /* If it starts with the magic string, then skip that */ |
| if (strncmp(sp, magic, strlen(magic)) == 0) |
| sp += strlen(magic); |
| |
| /* It stops at the first '$', max 8 chars */ |
| for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++) |
| continue; |
| |
| /* get the length of the true salt */ |
| sl = ep - sp; |
| |
| /* */ |
| err = px_find_digest("md5", &ctx); |
| if (err) |
| return NULL; |
| err = px_find_digest("md5", &ctx1); |
| |
| /* The password first, since that is what is most unknown */ |
| px_md_update(ctx, (const uint8 *) pw, strlen(pw)); |
| |
| /* Then our magic string */ |
| px_md_update(ctx, (uint8 *) magic, strlen(magic)); |
| |
| /* Then the raw salt */ |
| px_md_update(ctx, (const uint8 *) sp, sl); |
| |
| /* Then just as many characters of the MD5(pw,salt,pw) */ |
| px_md_update(ctx1, (const uint8 *) pw, strlen(pw)); |
| px_md_update(ctx1, (const uint8 *) sp, sl); |
| px_md_update(ctx1, (const uint8 *) pw, strlen(pw)); |
| px_md_finish(ctx1, final); |
| for (pl = strlen(pw); pl > 0; pl -= MD5_SIZE) |
| px_md_update(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 = strlen(pw); i; i >>= 1) |
| if (i & 1) |
| px_md_update(ctx, final, 1); |
| else |
| px_md_update(ctx, (const uint8 *) pw, 1); |
| |
| /* Now make the output string */ |
| strcpy(passwd, magic); |
| strncat(passwd, sp, sl); |
| strcat(passwd, "$"); |
| |
| px_md_finish(ctx, final); |
| |
| /* |
| * 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++) |
| { |
| px_md_reset(ctx1); |
| if (i & 1) |
| px_md_update(ctx1, (const uint8 *) pw, strlen(pw)); |
| else |
| px_md_update(ctx1, final, MD5_SIZE); |
| |
| if (i % 3) |
| px_md_update(ctx1, (const uint8 *) sp, sl); |
| |
| if (i % 7) |
| px_md_update(ctx1, (const uint8 *) pw, strlen(pw)); |
| |
| if (i & 1) |
| px_md_update(ctx1, final, MD5_SIZE); |
| else |
| px_md_update(ctx1, (const uint8 *) pw, strlen(pw)); |
| px_md_finish(ctx1, final); |
| } |
| |
| p = passwd + strlen(passwd); |
| |
| l = (final[0] << 16) | (final[6] << 8) | final[12]; |
| _crypt_to64(p, l, 4); |
| p += 4; |
| l = (final[1] << 16) | (final[7] << 8) | final[13]; |
| _crypt_to64(p, l, 4); |
| p += 4; |
| l = (final[2] << 16) | (final[8] << 8) | final[14]; |
| _crypt_to64(p, l, 4); |
| p += 4; |
| l = (final[3] << 16) | (final[9] << 8) | final[15]; |
| _crypt_to64(p, l, 4); |
| p += 4; |
| l = (final[4] << 16) | (final[10] << 8) | final[5]; |
| _crypt_to64(p, l, 4); |
| p += 4; |
| l = final[11]; |
| _crypt_to64(p, l, 2); |
| p += 2; |
| *p = '\0'; |
| |
| /* Don't leave anything around in vm they could use. */ |
| memset(final, 0, sizeof final); |
| |
| px_md_free(ctx1); |
| px_md_free(ctx); |
| |
| return passwd; |
| } |