Initial Commit

7 files changed, 1154 insertions, 0 deletions

diff --git a/crammd5/Makefile.am b/crammd5/Makefile.am
new file mode 100644
index 0000000..d209ae7
--- /dev/null
+++ b/crammd5/Makefile.am
@@ -0,0 +1,14 @@
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diff --git a/crammd5/Makefile.in b/crammd5/Makefile.in
new file mode 100644
index 0000000..73d2970
--- /dev/null
+++ b/crammd5/Makefile.in
@@ -0,0 +1,479 @@
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+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
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diff --git a/crammd5/client-crammd5.c b/crammd5/client-crammd5.c
new file mode 100644
index 0000000..02a5163
--- /dev/null
+++ b/crammd5/client-crammd5.c
@@ -0,0 +1,142 @@
+/*
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+#include <sys/types.h>
+#include "hmacmd5.h"
+#include "auth-client.h"
+#include "auth-plugin.h"
+
+#define NELT(x)		(sizeof x / sizeof x[0])
+
+static int crammd5_init (void *pctx);
+static void crammd5_destroy (void *ctx);
+static const char *crammd5_response (void *ctx,
+				     const char *challenge, int *len,
+				     auth_interact_t interact, void *arg);
+
+const struct auth_client_plugin sasl_client =
+  {
+  /* Plugin information */
+    "CRAM-MD5",
+    "Challenge-Response Authentication Mechanism (RFC 2195)",
+  /* Plugin instance */
+    crammd5_init,
+    crammd5_destroy,
+  /* Authentication */
+    crammd5_response,
+    0,
+  /* Security Layer */
+    0,
+    NULL,
+    NULL,
+  };
+
+static const struct auth_client_request client_request[] =
+  {
+    { "user",		AUTH_CLEARTEXT | AUTH_USER,	"User Name",	0, },
+    { "passphrase",	AUTH_PASS,			"Pass Phrase",	0, },
+  };
+
+struct crammd5_context
+  {
+    int state;
+    char *response;
+    int response_len;
+  };
+ 
+static int 
+crammd5_init (void *pctx)
+{
+  struct crammd5_context *context;
+
+  context = malloc (sizeof (struct crammd5_context));
+  memset (context, 0, sizeof (struct crammd5_context));
+
+  *(void **) pctx = context;
+  return 1;
+}
+
+static void
+crammd5_destroy (void *ctx)
+{
+  struct crammd5_context *context = ctx;
+
+  if (context->response != NULL)
+    {
+      memset (context->response, 0, context->response_len);
+      free (context->response);
+    }
+  free (context);
+}
+
+static const char *
+crammd5_response (void *ctx, const char *challenge, int *len,
+		  auth_interact_t interact, void *arg)
+{
+  struct crammd5_context *context = ctx;
+  char *result[NELT (client_request)];
+  unsigned char digest[16];
+  char *p, *response;
+  int response_len;
+  size_t i;
+  static const char hex[] = "0123456789abcdef";
+
+  switch (context->state)
+    {
+    case 0:	/* No initial response */
+      context->state = 1;
+      *len = 0;
+      return NULL;
+
+    case 1:	/* Digest the challenge and compute a response. */
+      if (!(*interact) (client_request, result, NELT (client_request), arg))
+        break;
+      hmac_md5 (challenge, *len, result[1], strlen (result[1]), digest);
+      response_len = strlen (result[0]) + 1 + 2 * sizeof digest;
+      response = malloc (response_len);
+      strcpy (response, result[0]);
+      strcat (response, " ");
+      p = strchr (response, '\0');
+      for (i = 0; i < sizeof digest; i++)
+        {
+          *p++ = hex[(digest[i] >> 4) & 0x0F];
+          *p++ = hex[digest[i] & 0x0F];
+        }
+      /* Note no \0 termination */
+      context->state = -1;
+      context->response = response;
+      context->response_len = response_len;
+      *len = response_len;
+      return response;
+    }
+  *len = 0;
+  return NULL;
+}
+
diff --git a/crammd5/hmacmd5.c b/crammd5/hmacmd5.c
new file mode 100644
index 0000000..80e2b33
--- /dev/null
+++ b/crammd5/hmacmd5.c
@@ -0,0 +1,120 @@
+/*
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <sys/types.h>
+#include "hmacmd5.h"
+
+#define PAD_SIZE	64
+
+/*
+ * the HMAC_MD5 transform looks like:
+ *
+ * MD5(K XOR opad, MD5(K XOR ipad, challenge))
+ *
+ * where K is an n byte secret
+ * ipad is the byte 0x36 repeated 64 times
+ * opad is the byte 0x5c repeated 64 times
+ * and challenge is the data being protected
+ */
+
+/* Precompute HMAC-MD5 contexts from a secret
+ */
+void
+hmac_md5_pre (const void *secret, size_t secret_len,
+              MD5_CTX *inner, MD5_CTX *outer)
+{
+  unsigned char ipad[PAD_SIZE];
+  unsigned char opad[PAD_SIZE];
+  unsigned char tk[16];
+  int i;
+
+  /* If secret is longer than 64 bytes reset it to secret = MD5 (secret)
+   */
+  if (secret_len > PAD_SIZE)
+    {
+      MD5_CTX tctx;
+
+      MD5_Init (&tctx);
+      MD5_Update (&tctx, secret, secret_len);
+      MD5_Final (tk, &tctx);
+      secret = tk;
+      secret_len = sizeof tk;
+    }
+
+  /* start out by storing secret in pads */
+  memcpy (ipad, secret, secret_len);
+  if (secret_len < sizeof ipad)
+    memset (ipad + secret_len, 0, sizeof ipad - secret_len);
+  memcpy (opad, secret, secret_len);
+  if (secret_len < sizeof opad)
+    memset (opad + secret_len, 0, sizeof opad - secret_len);
+
+  /* XOR secret with ipad and opad values */
+  for (i = 0; i < PAD_SIZE; i++)
+    {
+      ipad[i] ^= 0x36;
+      opad[i] ^= 0x5c;
+    }
+
+  /* perform inner MD5 */
+  MD5_Init (inner);
+  MD5_Update (inner, ipad, sizeof ipad);
+
+  /* perform outer MD5 */
+  MD5_Init (outer);
+  MD5_Update (outer, opad, sizeof opad);
+}
+
+/* Finalise HMAC-MD5 contexts from a challenge
+ */
+void
+hmac_md5_post (const void *challenge, size_t challenge_len,
+               MD5_CTX *inner, MD5_CTX *outer, unsigned char digest[16])
+{
+  unsigned char id[16];
+
+  /* perform inner MD5 */
+  MD5_Update (inner, challenge, challenge_len);
+  MD5_Final (id, inner);
+
+  /* perform outer MD5 */
+  MD5_Update (outer, id, sizeof id);
+  MD5_Final (digest, outer);
+}
+
+/* Digest a challenge and a secret.
+ */
+void
+hmac_md5 (const void *challenge, size_t challenge_len,
+	  const void *secret, size_t secret_len,
+	  unsigned char digest[16])
+{
+  MD5_CTX inner, outer;
+
+  hmac_md5_pre (secret, secret_len, &inner, &outer);
+  hmac_md5_post (challenge, challenge_len, &inner, &outer, digest);
+}
+
diff --git a/crammd5/hmacmd5.h b/crammd5/hmacmd5.h
new file mode 100644
index 0000000..2a46175
--- /dev/null
+++ b/crammd5/hmacmd5.h
@@ -0,0 +1,51 @@
+#ifndef _hmac_md5_h
+#define _hmac_md5_h
+/*
+ *  This file is part of libESMTP, a library for submission of RFC 2822
+ *  formatted electronic mail messages using the SMTP protocol described
+ *  in RFC 2821.
+ *
+ *  Copyright (C) 2001,2002  Brian Stafford  <brian@stafford.uklinux.net>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if HAVE_LIBCRYPTO
+
+#include <openssl/md5.h>
+
+#else
+
+#include "md5.h"
+
+#define MD5_CTX			MD5Context
+#define MD5_Init(c)		md5_init((c))
+#define MD5_Update(c,d,l)	md5_update((c),(d),(l))
+#define MD5_Final(md,c)		md5_final((c),(md))
+
+#endif
+
+/* Precompute HMAC-MD5 contexts from a secret. */
+void hmac_md5_pre (const void *secret, size_t secret_len,
+                   MD5_CTX *inner, MD5_CTX *outer);
+/* Finalise HMAC-MD5 contexts from a challenge.  */
+void hmac_md5_post (const void *challenge, size_t challenge_len,
+                    MD5_CTX *inner, MD5_CTX *outer, unsigned char digest[16]);
+/* Digest a challenge and a secret.  */
+void hmac_md5 (const void *challenge, size_t challenge_len,
+	       const void *secret, size_t secret_len,
+	       unsigned char digest[16]);
+
+#endif
diff --git a/crammd5/md5.c b/crammd5/md5.c
new file mode 100644
index 0000000..858a630
--- /dev/null
+++ b/crammd5/md5.c
@@ -0,0 +1,297 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to md5_init, call md5_update as
+ * needed on buffers full of bytes, and then call md5_Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+/* parts of this file are:
+ * Written March 1993 by Branko Lankester
+ * Modified June 1993 by Colin Plumb for altered md5.c.
+ * Modified October 1995 by Erik Troan for RPM
+ */
+
+/* Modified 2001 by Brian Stafford to use ISO C typedefs for various
+ * quantities.  Also eliminated convenience functions not needed for
+ * libESMTP.
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include "md5.h"
+
+static void md5_transform (unsigned32_t buf[4], const unsigned32_t in[16]);
+
+static unsigned32_t _ie = 0x44332211;
+static union _endian { unsigned32_t i; unsigned char b[4]; } *_endian = (union _endian *)&_ie;
+#define	IS_BIG_ENDIAN()		(_endian->b[0] == '\x44')
+#define	IS_LITTLE_ENDIAN()	(_endian->b[0] == '\x11')
+
+
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+static void 
+_byte_reverse (unsigned char *buf, unsigned32_t longs)
+{
+	unsigned32_t t;
+	do {
+		t = (unsigned32_t) ((unsigned32_t) buf[3] << 8 | buf[2]) << 16 |
+			((unsigned32_t) buf[1] << 8 | buf[0]);
+		*(unsigned32_t *) buf = t;
+		buf += 4;
+	} while (--longs);
+}
+
+
+/**
+ * md5_init: Initialise an md5 context object
+ * @ctx: md5 context 
+ * 
+ * Initialise an md5 buffer. 
+ *
+ **/
+void 
+md5_init (MD5Context *ctx)
+{
+	ctx->buf[0] = 0x67452301;
+	ctx->buf[1] = 0xefcdab89;
+	ctx->buf[2] = 0x98badcfe;
+	ctx->buf[3] = 0x10325476;
+	
+	ctx->bits[0] = 0;
+	ctx->bits[1] = 0;
+	
+	if (IS_BIG_ENDIAN())	
+		ctx->doByteReverse = 1;		
+	else 
+		ctx->doByteReverse = 0;	
+}
+
+
+/**
+ * md5_update: add a buffer to md5 hash computation
+ * @ctx: conetxt object used for md5 computaion
+ * @buf: buffer to add
+ * @len: buffer length
+ * 
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes. Use this to progressively construct an md5 hash.
+ **/
+void 
+md5_update (MD5Context *ctx, const void *buf, size_t len)
+{
+	unsigned32_t t;
+	const unsigned char *ucbuf = buf;
+	
+	/* Update bitcount */
+	t = ctx->bits[0];
+	if ((ctx->bits[0] = t + ((unsigned32_t) len << 3)) < t)
+		ctx->bits[1]++;		/* Carry from low to high */
+	ctx->bits[1] += len >> 29;
+	
+	t = (t >> 3) & 0x3f;	/* Bytes already in shsInfo->data */
+	
+	/* Handle any leading odd-sized chunks */
+	if (t) {
+		unsigned char *p = (unsigned char *) ctx->in + t;
+		
+		t = 64 - t;
+		if (len < t) {
+			memcpy (p, ucbuf, len);
+			return;
+		}
+		memcpy (p, ucbuf, t);
+		if (ctx->doByteReverse)
+			_byte_reverse (ctx->in, 16);
+		md5_transform (ctx->buf, (unsigned32_t *) ctx->in);
+		ucbuf += t;
+		len -= t;
+	}
+	
+	/* Process data in 64-byte chunks */
+	while (len >= 64) {
+		memcpy (ctx->in, ucbuf, 64);
+		if (ctx->doByteReverse)
+			_byte_reverse (ctx->in, 16);
+		md5_transform (ctx->buf, (unsigned32_t *) ctx->in);
+		ucbuf += 64;
+		len -= 64;
+	}
+	
+	/* Handle any remaining bytes of data. */
+	memcpy (ctx->in, ucbuf, len);
+}
+
+
+/*
+ * Final wrapup - pad to 64-byte boundary with the bit pattern 
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+/**
+ * md5_final: copy the final md5 hash to a bufer
+ * @digest: 16 bytes buffer
+ * @ctx: context containing the calculated md5
+ * 
+ * copy the final md5 hash to a bufer
+ **/
+void 
+md5_final (MD5Context *ctx, unsigned char digest[16])
+{
+	unsigned32_t count;
+	unsigned char *p;
+	
+	/* Compute number of bytes mod 64 */
+	count = (ctx->bits[0] >> 3) & 0x3F;
+	
+	/* Set the first char of padding to 0x80.  This is safe since there is
+	   always at least one byte free */
+	p = ctx->in + count;
+	*p++ = 0x80;
+	
+	/* Bytes of padding needed to make 64 bytes */
+	count = 64 - 1 - count;
+	
+	/* Pad out to 56 mod 64 */
+	if (count < 8) {
+		/* Two lots of padding:  Pad the first block to 64 bytes */
+		memset (p, 0, count);
+		if (ctx->doByteReverse)
+			_byte_reverse (ctx->in, 16);
+		md5_transform (ctx->buf, (unsigned32_t *) ctx->in);
+		
+		/* Now fill the next block with 56 bytes */
+		memset (ctx->in, 0, 56);
+	} else {
+		/* Pad block to 56 bytes */
+		memset (p, 0, count - 8);
+	}
+	if (ctx->doByteReverse)
+		_byte_reverse (ctx->in, 14);
+	
+	/* Append length in bits and transform */
+	((unsigned32_t *) ctx->in)[14] = ctx->bits[0];
+	((unsigned32_t *) ctx->in)[15] = ctx->bits[1];
+	
+	md5_transform (ctx->buf, (unsigned32_t *) ctx->in);
+	if (ctx->doByteReverse)
+		_byte_reverse ((unsigned char *) ctx->buf, 4);
+	memcpy (digest, ctx->buf, 16);
+}
+
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) \
+	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data.  md5_Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+static void 
+md5_transform (unsigned32_t buf[4], const unsigned32_t in[16])
+{
+	register unsigned32_t a, b, c, d;
+	
+	a = buf[0];
+	b = buf[1];
+	c = buf[2];
+	d = buf[3];
+	
+	MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+	MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+	MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
+	MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+	MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+	MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+	MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
+	MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
+	MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
+	MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+	MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+	MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+	MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
+	MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
+	MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
+	MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
+	
+	MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+	MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
+	MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+	MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+	MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+	MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
+	MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+	MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+	MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+	MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+	MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+	MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+	MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+	MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+	MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+	MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+	
+	MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+	MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
+	MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+	MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+	MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+	MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+	MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+	MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+	MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+	MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+	MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+	MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
+	MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+	MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+	MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+	MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+	
+	MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
+	MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
+	MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+	MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+	MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+	MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+	MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+	MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+	MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+	MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+	MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
+	MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+	MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+	MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+	MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+	MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+	
+	buf[0] += a;
+	buf[1] += b;
+	buf[2] += c;
+	buf[3] += d;
+}
diff --git a/crammd5/md5.h b/crammd5/md5.h
new file mode 100644
index 0000000..1274534
--- /dev/null
+++ b/crammd5/md5.h
@@ -0,0 +1,51 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+
+/* parts of this file are :
+ * Written March 1993 by Branko Lankester
+ * Modified June 1993 by Colin Plumb for altered md5.c.
+ * Modified October 1995 by Erik Troan for RPM
+ */
+#ifndef MD5_UTILS_H
+#define MD5_UTILS_H
+
+#if SIZEOF_UNSIGNED_INT == 32 / 8
+typedef	unsigned int unsigned32_t;
+#elif SIZEOF_UNSIGNED_LONG == 32 / 8
+typedef	unsigned long unsigned32_t;
+#else
+#include <sys/types.h>
+typedef	uint32 unsigned32_t;
+#endif
+
+#include <sys/types.h>
+
+typedef struct {
+	unsigned32_t buf[4];
+	unsigned32_t bits[2];
+	unsigned char in[64];
+	int doByteReverse;
+} MD5Context ;
+
+/* raw routines */
+void md5_init (MD5Context *ctx);
+void md5_update (MD5Context *ctx, const void *buf, size_t len);
+void md5_final (MD5Context *ctx, unsigned char digest[16]);
+
+
+#endif	/* MD5_UTILS_H */