diff options
Diffstat (limited to 'lib/libcrypt/crypt-md5.c')
-rw-r--r-- | lib/libcrypt/crypt-md5.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/lib/libcrypt/crypt-md5.c b/lib/libcrypt/crypt-md5.c new file mode 100644 index 0000000..ba48583 --- /dev/null +++ b/lib/libcrypt/crypt-md5.c @@ -0,0 +1,120 @@ +/* + * ---------------------------------------------------------------------------- + * "THE BEER-WARE LICENSE" (Revision 42): + * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you + * can do whatever you want with this stuff. If we meet some day, and you think + * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp + * ---------------------------------------------------------------------------- + * + * $FreeBSD$ + * + */ + +/* +// Modularized by Brandon Gillespie +*/ + +#if defined(LIBC_SCCS) && !defined(lint) +static char rcsid[] = "$Header: /home/ncvs/src/lib/libcrypt/crypt.c,v 1.4 1996/07/12 18:56:01 jkh Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include "crypt.h" + +char * +crypt_md5(pw, pl, sp, sl, passwd, token) + register const unsigned char *pw; + const unsigned int pl; + register const unsigned char *sp; + const unsigned int sl; + char * passwd; + char * token; +{ + char *p; + unsigned char final[_MD5_SIZE]; + int i,j; + MD5_CTX ctx,ctx1; + unsigned long l; + + MD5Init(&ctx); + + /* The password first, since that is what is most unknown */ + MD5Update(&ctx,pw,pl); + + /* Then our magic string */ + MD5Update(&ctx,(unsigned char *)token,strlen(token)); + + /* Then the raw salt */ + MD5Update(&ctx,sp,sl); + + /* Then just as many characters of the MD5(pw,salt,pw) */ + MD5Init(&ctx1); + MD5Update(&ctx1,pw,pl); + MD5Update(&ctx1,sp,sl); + MD5Update(&ctx1,pw,pl); + MD5Final(final,&ctx1); + for(i = pl; i > 0; i -= 16) + MD5Update(&ctx,final,i>16 ? 16 : i); + + /* Don't leave anything around in vm they could use. */ + memset(final,0,sizeof final); + + /* Then something really weird... */ + for (j=0,i = pl; i ; i >>= 1) + if(i&1) + MD5Update(&ctx, final+j, 1); + else + MD5Update(&ctx, pw+j, 1); + + /* Now make the output string */ + strcpy(passwd, token); + strncat(passwd, (char *)sp, (int)sl); + strcat(passwd, "$"); + + 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,pl); + else + MD5Update(&ctx1,final,_MD5_SIZE); + + if(i % 3) + MD5Update(&ctx1,sp,sl); + + if(i % 7) + MD5Update(&ctx1,pw,pl); + + if(i & 1) + MD5Update(&ctx1,final,_MD5_SIZE); + else + MD5Update(&ctx1,pw,pl); + MD5Final(final,&ctx1); + } + + p = passwd + strlen(passwd); + + l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4; + l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4; + l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4; + l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4; + l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4; + l = final[11] ; to64(p,l,2); p += 2; + *p = '\0'; + + /* Don't leave anything around in vm they could use. */ + memset(final,0,sizeof final); + + return passwd; +} + |