HGKeeper

* Original md4 taken from linux kernel

* MD4 Message Digest Algorithm (RFC1320).

* Implementation derived from Andrew Tridgell and Steve French's

* CIFS MD4 implementation, and the cryptoapi implementation

* originally based on the public domain implementation written

* by Colin Plumb in 1993.

* Copyright (c) Andrew Tridgell 1997-1998.

* Modified by Steve French (sfrench@us.ibm.com) 2002

* Copyright (c) Cryptoapi developers.

#include "internal.h"

#include "md4hash.h"

#include <string.h>

#define MD4_DIGEST_SIZE 16

#define MD4_BLOCK_WORDS 16

#define MD4_HASH_WORDS 4

#define PURPLE_MD4_HASH_GET_PRIVATE(obj) \

(G_TYPE_INSTANCE_GET_PRIVATE((obj), PURPLE_TYPE_MD4_HASH, PurpleMD4HashPrivate))

/******************************************************************************

* Structs

*****************************************************************************/

typedef struct {

guint32 hash[MD4_HASH_WORDS];

guint32 block[MD4_BLOCK_WORDS];

guint64 byte_count;

} PurpleMD4HashPrivate;

/******************************************************************************

* Globals

*****************************************************************************/

static GObjectClass *parent_class = NULL;

/******************************************************************************

* Helpers

*****************************************************************************/

#define ROUND1(a,b,c,d,k,s) \

(a = lshift(a + F(b,c,d) + k, s))

#define ROUND2(a,b,c,d,k,s) \

(a = lshift(a + G(b,c,d) + k + (guint32)0x5a827999,s))

#define ROUND3(a,b,c,d,k,s) \

(a = lshift(a + H(b,c,d) + k + (guint32)0x6ed9eba1,s))

static inline guint32

lshift(guint32 x, unsigned int s) {

x &= 0xffffffff;

return (((x << s) & 0xffffffff) | (x >> (32 - s)));

}

static inline guint32

F(guint32 x, guint32 y, guint32 z) {

return ((x & y) | ((~x) & z));

}

static inline guint32

G(guint32 x, guint32 y, guint32 z) {

return ((x & y) | (x & z) | (y & z));

}

static inline guint32

H(guint32 x, guint32 y, guint32 z) {

return (x ^ y ^ z);

}

static inline void

le32_to_cpu_array(guint32 *buf, unsigned int words) {

while(words--) {

*buf = GUINT_FROM_LE(*buf);

buf++;

}

static inline void

cpu_to_le32_array(guint32 *buf, unsigned int words) {

while(words--) {

*buf = GUINT_TO_LE(*buf);

buf++;

}

static void

md4_transform(guint32 *hash, guint32 const *in) {

guint32 a, b, c, d;

a = hash[0];

b = hash[1];

c = hash[2];

d = hash[3];

ROUND1(a, b, c, d, in[0], 3);

ROUND1(d, a, b, c, in[1], 7);

ROUND1(c, d, a, b, in[2], 11);

ROUND1(b, c, d, a, in[3], 19);

ROUND1(a, b, c, d, in[4], 3);

ROUND1(d, a, b, c, in[5], 7);

ROUND1(c, d, a, b, in[6], 11);

ROUND1(b, c, d, a, in[7], 19);

ROUND1(a, b, c, d, in[8], 3);

ROUND1(d, a, b, c, in[9], 7);

ROUND1(c, d, a, b, in[10], 11);

ROUND1(b, c, d, a, in[11], 19);

ROUND1(a, b, c, d, in[12], 3);

ROUND1(d, a, b, c, in[13], 7);

ROUND1(c, d, a, b, in[14], 11);

ROUND1(b, c, d, a, in[15], 19);

ROUND2(a, b, c, d,in[ 0], 3);

ROUND2(d, a, b, c, in[4], 5);

ROUND2(c, d, a, b, in[8], 9);

ROUND2(b, c, d, a, in[12], 13);

ROUND2(a, b, c, d, in[1], 3);

ROUND2(d, a, b, c, in[5], 5);

ROUND2(c, d, a, b, in[9], 9);

ROUND2(b, c, d, a, in[13], 13);

ROUND2(a, b, c, d, in[2], 3);

ROUND2(d, a, b, c, in[6], 5);

ROUND2(c, d, a, b, in[10], 9);

ROUND2(b, c, d, a, in[14], 13);

ROUND2(a, b, c, d, in[3], 3);

ROUND2(d, a, b, c, in[7], 5);

ROUND2(c, d, a, b, in[11], 9);

ROUND2(b, c, d, a, in[15], 13);

ROUND3(a, b, c, d,in[ 0], 3);

ROUND3(d, a, b, c, in[8], 9);

ROUND3(c, d, a, b, in[4], 11);

ROUND3(b, c, d, a, in[12], 15);

ROUND3(a, b, c, d, in[2], 3);

ROUND3(d, a, b, c, in[10], 9);

ROUND3(c, d, a, b, in[6], 11);

ROUND3(b, c, d, a, in[14], 15);

ROUND3(a, b, c, d, in[1], 3);

ROUND3(d, a, b, c, in[9], 9);

ROUND3(c, d, a, b, in[5], 11);

ROUND3(b, c, d, a, in[13], 15);

ROUND3(a, b, c, d, in[3], 3);

ROUND3(d, a, b, c, in[11], 9);

ROUND3(c, d, a, b, in[7], 11);

ROUND3(b, c, d, a, in[15], 15);

hash[0] += a;

hash[1] += b;

hash[2] += c;

hash[3] += d;

}

static inline void

md4_transform_helper(PurpleHash *hash) {

PurpleMD4HashPrivate *priv = PURPLE_MD4_HASH_GET_PRIVATE(hash);

le32_to_cpu_array(priv->block, sizeof(priv->block) / sizeof(guint32));

md4_transform(priv->hash, priv->block);

}

/******************************************************************************

* Hash Stuff

*****************************************************************************/

static void

purple_md4_hash_reset(PurpleHash *hash) {

PurpleMD4HashPrivate *priv = PURPLE_MD4_HASH_GET_PRIVATE(hash);

priv->hash[0] = 0x67452301;

priv->hash[1] = 0xefcdab89;

priv->hash[2] = 0x98badcfe;

priv->hash[3] = 0x10325476;

priv->byte_count = 0;

memset(priv->block, 0, sizeof(priv->block));

}

static void

purple_md4_hash_append(PurpleHash *hash, const guchar *data, size_t len) {

PurpleMD4HashPrivate *priv = PURPLE_MD4_HASH_GET_PRIVATE(hash);

const guint32 avail = sizeof(priv->block) - (priv->byte_count & 0x3f);

priv->byte_count += len;

if(avail > len) {

memcpy((char *)priv->block +

(sizeof(priv->block) - avail),

data, len);

return;

}

memcpy((char *)priv->block +

(sizeof(priv->block) - avail),

data, avail);

md4_transform_helper(hash);

data += avail;

len -= avail;

while(len >= sizeof(priv->block)) {

memcpy(priv->block, data, sizeof(priv->block));

md4_transform_helper(hash);

data += sizeof(priv->block);

len -= sizeof(priv->block);

}

memcpy(priv->block, data, len);

}

static gboolean

purple_md4_hash_digest(PurpleHash *hash, guchar *out, size_t len)

{

PurpleMD4HashPrivate *priv = PURPLE_MD4_HASH_GET_PRIVATE(hash);

const unsigned int offset = priv->byte_count & 0x3f;

gchar *p = (gchar *)priv->block + offset;

gint padding = 56 - (offset + 1);

if(len < 16)

return FALSE;

*p++ = 0x80;

if(padding < 0) {

memset(p, 0x00, padding + sizeof(guint64));

md4_transform_helper(hash);

p = (gchar *)priv->block;

padding = 56;

}

memset(p, 0, padding);

priv->block[14] = priv->byte_count << 3;

priv->block[15] = priv->byte_count >> 29;

le32_to_cpu_array(priv->block,

(sizeof(priv->block) - sizeof(guint64)) /

sizeof(guint32));

md4_transform(priv->hash, priv->block);

cpu_to_le32_array(priv->hash, sizeof(priv->hash) / sizeof(guint32));

memcpy(out, priv->hash, sizeof(priv->hash));

return TRUE;

}

static size_t

purple_md4_hash_get_digest_size(PurpleHash *hash)

{

return 16;

}

static size_t

purple_md4_hash_get_block_size(PurpleHash *hash)

{

/* This does not change (in this case) */

return 64;

}

/******************************************************************************

* Object Stuff

*****************************************************************************/

static void

purple_md4_hash_class_init(PurpleMD4HashClass *klass) {

PurpleHashClass *hash_class = PURPLE_HASH_CLASS(klass);

parent_class = g_type_class_peek_parent(klass);

g_type_class_add_private(klass, sizeof(PurpleMD4HashPrivate));

hash_class->reset = purple_md4_hash_reset;

hash_class->reset_state = purple_md4_hash_reset;

hash_class->append = purple_md4_hash_append;

hash_class->digest = purple_md4_hash_digest;

hash_class->get_digest_size = purple_md4_hash_get_digest_size;

hash_class->get_block_size = purple_md4_hash_get_block_size;

}

/******************************************************************************

* API

*****************************************************************************/

GType

purple_md4_hash_get_type(void) {

static GType type = 0;

if(type == 0) {

static const GTypeInfo info = {

sizeof(PurpleMD4HashClass),

NULL,

(GClassInitFunc)purple_md4_hash_class_init,

NULL,

sizeof(PurpleMD4Hash),

(GInstanceInitFunc)purple_hash_reset,

NULL,

};

type = g_type_register_static(PURPLE_TYPE_HASH,

"PurpleMD4Hash",

&info, 0);

}

return type;

}

PurpleHash *

purple_md4_hash_new(void) {

return g_object_new(PURPLE_TYPE_MD4_HASH, NULL);

}

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