1 files changed, 160 insertions, 0 deletions

diff --git a/src/lib/libc/crypt/md5crypt.c b/src/lib/libc/crypt/md5crypt.c
new file mode 100644
index 0000000000..a855835bcc
--- /dev/null
+++ b/src/lib/libc/crypt/md5crypt.c
@@ -0,0 +1,160 @@
+/*      $OpenBSD: md5crypt.c,v 1.17 2014/04/03 15:55:29 beck Exp $      */
+
+/*
+ * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * If we meet some day, and you think this stuff is worth it, you
+ * can buy me a beer in return. Poul-Henning Kamp
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <md5.h>
+#include <string.h>
+
+static unsigned char itoa64[] =         /* 0 ... 63 => ascii - 64 */
+        "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static void to64(char *, u_int32_t, int);
+
+static void
+to64(char *s, u_int32_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(const char *pw, const char *salt);
+
+char *
+md5crypt(const char *pw, const char *salt)
+{
+        /*
+         * This string is the magic for this algorithm.
+         * Having it this way, we can 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;
+        u_int32_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 */
+        snprintf(passwd, sizeof(passwd), "%s%.*s$", (char *)magic,
+            sl, (const char *)sp);
+
+        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...
+         * On a modern machine, with possible GPU optimization,
+         * this will run a lot faster than that.
+         */
+        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;
+}
+