diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libcrypt/md5crypt.c')
| -rw-r--r-- | mdk-stage1/dietlibc/libcrypt/md5crypt.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libcrypt/md5crypt.c b/mdk-stage1/dietlibc/libcrypt/md5crypt.c new file mode 100644 index 000000000..ebbb4be44 --- /dev/null +++ b/mdk-stage1/dietlibc/libcrypt/md5crypt.c @@ -0,0 +1,157 @@ +/* $OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp $ */ + +/* + * ---------------------------------------------------------------------------- + * "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: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp $ + * + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char rcsid[] = "$OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include <unistd.h> +#include <stdio.h> +#include <string.h> +#include <md5.h> + +static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */ + "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + +static void to64 (char *, uint32_t, int); + +static void +to64(s, v, n) + char *s; + uint32_t v; + int n; +{ + while (--n >= 0) { + *s++ = itoa64[v&0x3f]; + v >>= 6; + } +} + +/* + * UNIX password + * + * Use MD5 for what it is best at... + */ + +char * +md5crypt(pw, salt) + register const char *pw; + register const char *salt; +{ + /* + * This string is magic for this algorithm. Having + * it this way, we can get get better later on + */ + static unsigned char *magic = (unsigned char *)"$1$"; + + static char passwd[120], *p; + static const unsigned char *sp,*ep; + unsigned char final[16]; + int sl,pl,i; + MD5_CTX ctx,ctx1; + uint32_t l; + + /* Refine the Salt first */ + sp = (const unsigned char *)salt; + + /* If it starts with the magic string, then skip that */ + if(!strncmp((const char *)sp,(const char *)magic,strlen((const char *)magic))) + sp += strlen((const char *)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; + + MD5Init(&ctx); + + /* The password first, since that is what is most unknown */ + MD5Update(&ctx,(const unsigned char *)pw,strlen(pw)); + + /* Then our magic string */ + MD5Update(&ctx,magic,strlen((const char *)magic)); + + /* Then the raw salt */ + MD5Update(&ctx,sp,sl); + + /* Then just as many characters of the MD5(pw,salt,pw) */ + MD5Init(&ctx1); + MD5Update(&ctx1,(const unsigned char *)pw,strlen(pw)); + MD5Update(&ctx1,sp,sl); + MD5Update(&ctx1,(const unsigned char *)pw,strlen(pw)); + MD5Final(final,&ctx1); + for(pl = strlen(pw); pl > 0; pl -= 16) + MD5Update(&ctx,final,pl>16 ? 16 : 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) + MD5Update(&ctx, final, 1); + else + MD5Update(&ctx, (const unsigned char *)pw, 1); + + /* Now make the output string */ + strcpy(passwd,(const char *)magic); + memcpy(passwd+3,sp,sl); + passwd[sl+3]='$'; + passwd[sl+4]=0; + + 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,(const unsigned char *)pw,strlen(pw)); + else + MD5Update(&ctx1,final,16); + + if(i % 3) + MD5Update(&ctx1,sp,sl); + + if(i % 7) + MD5Update(&ctx1,(const unsigned char *)pw,strlen(pw)); + + if(i & 1) + MD5Update(&ctx1,final,16); + else + MD5Update(&ctx1,(const unsigned char *)pw,strlen(pw)); + 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; +} + |