da5c7089a3
Secure Hashing Algorithm - 1 (SHA-1), along with the further
refinement of what $x$salt$hash means. With this new crypt the
following are all acceptable:
$1$
$MD5$
$SHA1$
Note: $2$ is used by OpenBSD's Blowfish, which I considered adding
as $BF$, but there is no actual need for it with SHA-1. However,
somebody wishing to add OpenBSD password support could easilly add
it in now.
There is also a malloc_crypt() available in the library now, which
behaves exactly the same as crypt(), but it uses a malloced buffer
instead of a static buffer. However, this is not standard so will
likely not be used much (at all).
Also, for those interested I did a brief speed test Pentium 166/MMX,
which shows the DES crypt to do approximately 2640 crypts a CPU second,
MD5 to do about 62 crypts a CPU second and SHA1 to do about 18 crypts
a CPU second.
Reviewed by: Mark Murray
121 lines
3.0 KiB
C
121 lines
3.0 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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* $FreeBSD$
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*
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*/
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/*
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// Modularized by Brandon Gillespie
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char rcsid[] = "$Header: /home/ncvs/src/lib/libcrypt/crypt.c,v 1.4 1996/07/12 18:56:01 jkh Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "crypt.h"
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char *
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crypt_md5(pw, pl, sp, sl, passwd, token)
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register const unsigned char *pw;
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const unsigned int pl;
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register const unsigned char *sp;
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const unsigned int sl;
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char * passwd;
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char * token;
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{
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char *p;
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unsigned char final[_MD5_SIZE];
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int i,j;
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MD5_CTX ctx,ctx1;
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unsigned long l;
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MD5Init(&ctx);
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/* The password first, since that is what is most unknown */
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MD5Update(&ctx,pw,pl);
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/* Then our magic string */
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MD5Update(&ctx,(unsigned char *)token,strlen(token));
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/* Then the raw salt */
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MD5Update(&ctx,sp,sl);
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/* Then just as many characters of the MD5(pw,salt,pw) */
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MD5Init(&ctx1);
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MD5Update(&ctx1,pw,pl);
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MD5Update(&ctx1,sp,sl);
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MD5Update(&ctx1,pw,pl);
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MD5Final(final,&ctx1);
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for(i = pl; i > 0; i -= 16)
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MD5Update(&ctx,final,i>16 ? 16 : i);
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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 (j=0,i = pl; i ; i >>= 1)
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if(i&1)
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MD5Update(&ctx, final+j, 1);
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else
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MD5Update(&ctx, pw+j, 1);
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/* Now make the output string */
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strcpy(passwd, token);
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strncat(passwd, (char *)sp, (int)sl);
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strcat(passwd, "$");
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MD5Final(final,&ctx);
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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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MD5Init(&ctx1);
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if(i & 1)
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MD5Update(&ctx1,pw,pl);
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else
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MD5Update(&ctx1,final,_MD5_SIZE);
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if(i % 3)
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MD5Update(&ctx1,sp,sl);
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if(i % 7)
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MD5Update(&ctx1,pw,pl);
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if(i & 1)
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MD5Update(&ctx1,final,_MD5_SIZE);
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else
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MD5Update(&ctx1,pw,pl);
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MD5Final(final,&ctx1);
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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]; to64(p,l,4); p += 4;
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l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
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l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
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l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
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l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
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l = final[11] ; to64(p,l,2); 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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return passwd;
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}
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