/* $Id: md5.c,v 1.9.2.2 2005/01/12 02:25:46 horms Exp $ */
/*
* 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.
*
* Cleaned up by Mitja Sarp <mitja@lysator.liu.se> for heartbeat
*
*/
#include <portability.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h> /* for sprintf() */
#include <string.h> /* for memcpy() */
#include <sys/types.h> /* for stupid systems */
#include <netinet/in.h> /* for ntohl() */
#include <HBauth.h>
#define PIL_PLUGINTYPE HB_AUTH_TYPE
#define PIL_PLUGIN md5
#define PIL_PLUGINTYPE_S "HBauth"
#define PIL_PLUGIN_S "md5"
#define PIL_PLUGINLICENSE LICENSE_PUBDOM
#define PIL_PLUGINLICENSEURL URL_PUBDOM
#include <pils/plugin.h>
/* The Ops we export to the world... */
static int md5_auth_calc(const struct HBauth_info *t
, const void * text, size_t textlen ,char * result, int resultlen);
static int md5_auth_needskey(void);
/* Authentication plugin operations */
static struct HBAuthOps md5ops =
{ md5_auth_calc
, md5_auth_needskey
};
/*
* The following two functions are only exported to the plugin infrastructure.
*/
/*
* md5close is called as part of shutting down the md5 HBauth plugin.
* If there was any global data allocated, or file descriptors opened, etc.
* which is associated with the plugin, and not a single interface
* in particular, here's our chance to clean it up.
*/
static void md5closepi(PILPlugin* pi)
{
}
/*
* md5closeintf called as part of shutting down the md5 HBauth interface.
* If there was any global data allocated, or file descriptors opened, etc.
* which is associated with the md5 implementation, here's our chance
* to clean it up.
*/
static PIL_rc md5closeintf(PILInterface* pi, void* pd)
{
return PIL_OK;
}
PIL_PLUGIN_BOILERPLATE("1.0", Debug, md5closepi);
static const PILPluginImports* PluginImports;
static PILPlugin* OurPlugin;
static PILInterface* OurInterface;
static void* OurImports;
static void* interfprivate;
/*
*
* Our plugin initialization and registration function
* It gets called when the plugin gets loaded.
*/
PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports);
PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports)
{
/* Force the compiler to do a little type checking */
(void)(PILPluginInitFun)PIL_PLUGIN_INIT;
PluginImports = imports;
OurPlugin = us;
/* Register ourself as a plugin */
imports->register_plugin(us, &OurPIExports);
/* Register our interfaces */
return imports->register_interface(us, PIL_PLUGINTYPE_S, PIL_PLUGIN_S
, &md5ops
, md5closeintf /*close */
, &OurInterface
, &OurImports
, interfprivate);
}
/*
* Real work starts here ;-)
*/
#define MD5_DIGESTSIZE 16
#define MD5_BLOCKSIZE 64
typedef struct MD5Context_st {
uint32_t buf[4];
uint32_t bytes[2];
uint32_t in[16];
}MD5Context;
#define md5byte unsigned char
struct MD5Context {
uint32_t buf[4];
uint32_t bytes[2];
uint32_t in[16];
};
static void MD5Init(MD5Context *context);
static void MD5Update(MD5Context *context, md5byte const *buf, unsigned len);
static void MD5Final(unsigned char digest[16], MD5Context *context);
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]);
static int
md5_auth_needskey(void)
{
return 1; /* Yes, we require (need) a key */
}
#define byteSwap(buf,words)
/*
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
* initialization constants.
*/
static void
MD5Init(MD5Context *ctx)
{
ctx->buf[0] = 0x67452301ul;
ctx->buf[1] = 0xefcdab89ul;
ctx->buf[2] = 0x98badcfeul;
ctx->buf[3] = 0x10325476ul;
ctx->bytes[0] = 0;
ctx->bytes[1] = 0;
}
/*
* Update context to reflect the concatenation of another buffer full
* of bytes.
*/
static void
MD5Update(MD5Context *ctx, md5byte const *buf, unsigned len)
{
uint32_t t;
/* Update byte count */
t = ctx->bytes[0];
if ((ctx->bytes[0] = t + len) < t)
ctx->bytes[1]++; /* Carry from low to high */
t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */
if (t > len) {
memcpy((md5byte *)ctx->in + 64 - t, buf, len);
return;
}
/* First chunk is an odd size */
memcpy((md5byte *)ctx->in + 64 - t, buf, t);
byteSwap(ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
buf += t;
len -= t;
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteSwap(ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
buf += 64;
len -= 64;
}
/* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
}
/*
* Final wrapup - pad to 64-byte boundary with the bit pattern
* 1 0* (64-bit count of bits processed, MSB-first)
*/
static void
MD5Final(md5byte digest[16], MD5Context *ctx)
{
int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */
md5byte *p = (md5byte *)ctx->in + count;
/* Set the first char of padding to 0x80. There is always room. */
*p++ = 0x80;
/* Bytes of padding needed to make 56 bytes (-8..55) */
count = 56 - 1 - count;
if (count < 0) { /* Padding forces an extra block */
memset(p, 0, count + 8);
byteSwap(ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
p = (md5byte *)ctx->in;
count = 56;
}
memset(p, 0, count);
byteSwap(ctx->in, 14);
/* Append length in bits and transform */
ctx->in[14] = ctx->bytes[0] << 3;
ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
MD5Transform(ctx->buf, ctx->in);
byteSwap(ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
}
/* 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,in,s) \
(w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
/*
* The core of the MD5 algorithm, this alters an existing MD5 hash to
* reflect the addition of 16 longwords of new data. MD5Update blocks
* the data and converts bytes into longwords for this routine.
*/
static void
MD5Transform(uint32_t buf[4], uint32_t const in[16])
{
register uint32_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] + 0xd76aa478ul, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756ul, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070dbul, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceeeul, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faful, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62aul, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613ul, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501ul, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8ul, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7aful, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1ul, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7beul, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122ul, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193ul, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438eul, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821ul, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562ul, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340ul, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51ul, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aaul, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105dul, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453ul, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681ul, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8ul, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6ul, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6ul, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87ul, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14edul, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905ul, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8ul, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9ul, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8aul, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942ul, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681ul, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122ul, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380cul, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44ul, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9ul, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60ul, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70ul, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6ul, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127faul, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085ul, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05ul, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039ul, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5ul, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8ul, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665ul, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244ul, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97ul, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7ul, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039ul, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3ul, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92ul, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47dul, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1ul, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4ful, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0ul, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314ul, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1ul, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82ul, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235ul, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bbul, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391ul, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
static int
md5_auth_calc(const struct HBauth_info *t, const void * text
, size_t textlen, char * result, int resultlen)
{
MD5Context context;
unsigned char digest[MD5_DIGESTSIZE];
const char * key = t->key;
/* inner padding - key XORd with ipad */
unsigned char k_ipad[65];
/* outer padding - * key XORd with opad */
unsigned char k_opad[65];
unsigned char tk[MD5_DIGESTSIZE];
int i, key_len;
if (resultlen <= (MD5_DIGESTSIZE+1) *2) {
return 0;
}
key_len = strlen(key);
/* if key is longer than MD5_BLOCKSIZE bytes reset it to key=MD5(key) */
if (key_len > MD5_BLOCKSIZE) {
MD5Context tctx;
MD5Init(&tctx);
MD5Update(&tctx, (const unsigned char*) key, key_len);
MD5Final(tk, &tctx);
key = (char*) tk;
key_len = MD5_DIGESTSIZE;
}
/* start out by storing key in pads */
memset(k_ipad, 0, sizeof k_ipad);
memset(k_opad, 0, sizeof k_opad);
memcpy(k_ipad, key, key_len);
memcpy(k_opad, key, key_len);
/* XOR key with ipad and opad values */
for (i=0; i<MD5_BLOCKSIZE; i++) {
k_ipad[i] ^= 0x36;
k_opad[i] ^= 0x5c;
}
/* perform inner MD5 */
MD5Init(&context); /* init context for 1st pass */
MD5Update(&context, k_ipad, MD5_BLOCKSIZE); /* start with inner pad */
MD5Update(&context, text, textlen); /* then text of datagram */
MD5Final(digest, &context); /* finish up 1st pass */
/* perform outer MD5 */
MD5Init(&context); /* init context for 2nd pass */
MD5Update(&context, k_opad, MD5_BLOCKSIZE); /* start with outer pad */
MD5Update(&context, digest, MD5_DIGESTSIZE); /* then results of 1st hash */
MD5Final(digest, &context); /* finish up 2nd pass */
/* And show the result in human-readable form */
for (i = 0; i < MD5_DIGESTSIZE; i++) {
sprintf(result, "%02x", digest[i]);
result +=2;
}
return 1;
}
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