65816-crypto/md4.cc

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/*
* Copyright (c) 2017,2023 Stephen Heumann
*
* 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.
*/
#pragma noroot
#pragma lint -1
#pragma optimize -1
#include "md4.h"
#include <string.h>
#define length_offset 0
#define extra_offset 8
#define hash_offset 40
#define data_offset 60
extern void MD4_PROCESSBLOCK(void);
/*
* Update a md4 context based on the specified data.
*/
void md4_update(struct md4_context *context,
const unsigned char *data,
unsigned long length)
{
unsigned int extra = context->extra;
unsigned long oldlength = context->length;
if ((context->length += length) < oldlength)
context->length2++;
if (extra > 0) {
if (length >= 64 - extra) {
memcpy(&context->block[extra], data, 64 - extra);
asm {
phd
lda context
tcd
jsl MD4_PROCESSBLOCK
pld
}
length -= 64 - extra;
data += 64 - extra;
} else {
memcpy(&context->block[extra], data, length);
context->extra += length;
return;
}
}
while (length >= 64) {
memcpy(&context->block, data, 64);
asm {
phd
lda context
tcd
jsl MD4_PROCESSBLOCK
pld
}
length -= 64;
data += 64;
}
memcpy(&context->block, data, length);
context->extra = length;
}
/*
* Finish md4 processing and generate the final hash code.
*/
void md4_finalize(struct md4_context *context)
{
unsigned int extra = context->extra;
context->block[extra++] = 0x80;
memset(&context->block[extra], 0, 64 - extra);
if (extra > 64 - 8) {
asm {
phd
lda context
tcd
jsl MD4_PROCESSBLOCK
pld
}
memset(&context->block, 0, 64 - 8);
}
asm {
phd
lda context
tcd
/* Append total length in bits */
asl length_offset
rol length_offset+2
rol length_offset+4
rol length_offset+6
asl length_offset
rol length_offset+2
rol length_offset+4
rol length_offset+6
asl length_offset
rol length_offset+2
rol length_offset+4
rol length_offset+6
lda length_offset
sta data_offset+56
lda length_offset+2
sta data_offset+58
lda length_offset+4
sta data_offset+60
lda length_offset+6
sta data_offset+62
/* Process final block */
jsl MD4_PROCESSBLOCK
pld
}
}
#define HASH_ALG md4
#include "hmacimpl.h"
#append "md4.asm"