+++ /dev/null
-/* -*-c-*-
- *
- * $Id: md2.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * The MD2 message digest function
- *
- * (c) 2001 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb 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 Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-#include "ghash.h"
-#include "ghash-def.h"
-#include "hash.h"
-#include "md2.h"
-#include "md2-tab.h"
-
-/*----- Tables ------------------------------------------------------------*/
-
-static const octet s[256] = MD2_S;
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @md2_compress@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context block
- * @const void *sbuf@ = pointer to buffer of appropriate size
- *
- * Returns: ---
- *
- * Use: MD2 compression and checksum function.
- */
-
-void md2_compress(md2_ctx *ctx, const void *sbuf)
-{
- unsigned i;
- unsigned t;
- octet x[MD2_BUFSZ];
- octet y[MD2_BUFSZ];
-
- /* --- Handy macro for doing something lots of times --- */
-
-#define DO(what, where) do { \
- what(where, 0); what(where, 1); what(where, 2); what(where, 3); \
- what(where, 4); what(where, 5); what(where, 6); what(where, 7); \
- what(where, 8); what(where, 9); what(where, 10); what(where, 11); \
- what(where, 12); what(where, 13); what(where, 14); what(where, 15); \
-} while (0)
-
- /* --- Do the hashing first to avoid corrupting the checksum --- */
-
- memcpy(x, sbuf, sizeof(x));
-#define X(z, i) y[i] = z[i] ^ ctx->h[i]
- DO(X, x);
-#undef X
-
- t = 0;
- for (i = 0; i < 18; i++) {
-#define X(z, i) t = z[i] ^= s[t];
- DO(X, ctx->h);
- DO(X, x);
- DO(X, y);
-#undef X
- t = U8(t + i);
- }
-
- /* --- Now compute the checksum --- */
-
- t = ctx->c[MD2_BUFSZ - 1];
-#define X(z, i) t = ctx->c[i] ^= s[z[i] ^ t]
- DO(X, ((const octet *)sbuf));
-#undef X
-
-#undef DO
-}
-
-/* --- @md2_init@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context block to initialize
- *
- * Returns: ---
- *
- * Use: Initializes a context block ready for hashing.
- */
-
-void md2_init(md2_ctx *ctx)
-{
- memset(ctx->c, 0, sizeof(ctx->c));
- memset(ctx->h, 0, sizeof(ctx->h));
- ctx->off = 0;
-}
-
-/* --- @md2_set@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context block
- * @const void *buf@ = pointer to state buffer
- * @unsigned long count@ = current count of bytes processed
- *
- * Returns: ---
- *
- * Use: Initializes a context block from a given state. This is
- * useful in cases where the initial hash state is meant to be
- * secret, e.g., for NMAC and HMAC support.
- */
-
-void md2_set(md2_ctx *ctx, const void *buf, unsigned long count)
-{
- const octet *p = buf;
- memcpy(ctx->h, p, MD2_BUFSZ);
- memcpy(ctx->c, p + MD2_BUFSZ, MD2_BUFSZ);
- ctx->off = 0;
-}
-
-/* --- @md2_hash@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context block
- * @const void *buf@ = buffer of data to hash
- * @size_t sz@ = size of buffer to hash
- *
- * Returns: ---
- *
- * Use: Hashes a buffer of data. The buffer may be of any size and
- * alignment.
- */
-
-void md2_hash(md2_ctx *ctx, const void *buf, size_t sz)
-{
- const octet *bbuf = (octet *)buf;
-
- /* --- Code automatically expanded from @HASH_BUFFER@ and tidied --- */
-
- if (ctx->off + sz < MD2_BUFSZ) {
- memcpy(ctx->buf + ctx->off, bbuf, sz);
- ctx->off += sz;
- } else {
- if (ctx->off) {
- size_t s = MD2_BUFSZ - ctx->off;
- memcpy(ctx->buf + ctx->off, bbuf, s);
- md2_compress(ctx, ctx->buf);
- sz -= s;
- bbuf += s;
- }
- while (sz >= MD2_BUFSZ) {
- md2_compress(ctx, bbuf);
- sz -= MD2_BUFSZ; bbuf += MD2_BUFSZ;
- }
- if (sz)
- memcpy(ctx->buf, bbuf, sz);
- ctx->off = sz;
- }
-}
-
-/* --- @md2_done@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context block
- * @void *hash@ = pointer to output buffer
- *
- * Returns: ---
- *
- * Use: Returns the hash of the data read so far.
- */
-
-void md2_done(md2_ctx *ctx, void *hash)
-{
- unsigned pad = MD2_BUFSZ - ctx->off;
- unsigned i;
- for (i = ctx->off; i < MD2_BUFSZ; i++)
- ctx->buf[i] = pad;
- md2_compress(ctx, ctx->buf);
- md2_compress(ctx, ctx->c);
- memcpy(hash, ctx->h, MD2_BUFSZ);
-}
-
-/* --- @md2_state@ --- *
- *
- * Arguments: @md2_ctx *ctx@ = pointer to context
- * @void *state@ = pointer to buffer for current state
- *
- * Returns: Number of bytes written to the hash function so far.
- *
- * Use: Returns the current state of the hash function such that
- * it can be passed to @md2_set@.
- */
-
-unsigned long md2_state(md2_ctx *ctx, void *state)
-{
- octet *p = state;
- memcpy(p, ctx->h, MD2_BUFSZ);
- memcpy(p + MD2_BUFSZ, ctx->c, MD2_BUFSZ);
- return (0);
-}
-
-/* --- Generic interface --- */
-
-GHASH_DEF(MD2, md2)
-
-/* --- Test code --- */
-
-HASH_TEST(MD2, md2)
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff