133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
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/*
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* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* MD2 low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/des.h>
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#include <openssl/mdc2.h>
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#undef c2l
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#define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
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l|=((DES_LONG)(*((c)++)))<< 8L, \
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l|=((DES_LONG)(*((c)++)))<<16L, \
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l|=((DES_LONG)(*((c)++)))<<24L)
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#undef l2c
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#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24L)&0xff))
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static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
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int MDC2_Init(MDC2_CTX *c)
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{
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c->num = 0;
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c->pad_type = 1;
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memset(&(c->h[0]), 0x52, MDC2_BLOCK);
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memset(&(c->hh[0]), 0x25, MDC2_BLOCK);
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return 1;
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}
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int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
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{
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size_t i, j;
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i = c->num;
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if (i != 0) {
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if (len < MDC2_BLOCK - i) {
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/* partial block */
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memcpy(&(c->data[i]), in, len);
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c->num += (int)len;
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return 1;
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} else {
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/* filled one */
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j = MDC2_BLOCK - i;
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memcpy(&(c->data[i]), in, j);
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len -= j;
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in += j;
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c->num = 0;
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mdc2_body(c, &(c->data[0]), MDC2_BLOCK);
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}
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}
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i = len & ~((size_t)MDC2_BLOCK - 1);
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if (i > 0)
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mdc2_body(c, in, i);
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j = len - i;
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if (j > 0) {
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memcpy(&(c->data[0]), &(in[i]), j);
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c->num = (int)j;
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}
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return 1;
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}
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static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
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{
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register DES_LONG tin0, tin1;
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register DES_LONG ttin0, ttin1;
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DES_LONG d[2], dd[2];
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DES_key_schedule k;
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unsigned char *p;
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size_t i;
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for (i = 0; i < len; i += 8) {
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c2l(in, tin0);
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d[0] = dd[0] = tin0;
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c2l(in, tin1);
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d[1] = dd[1] = tin1;
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c->h[0] = (c->h[0] & 0x9f) | 0x40;
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c->hh[0] = (c->hh[0] & 0x9f) | 0x20;
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DES_set_odd_parity(&c->h);
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DES_set_key_unchecked(&c->h, &k);
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DES_encrypt1(d, &k, 1);
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DES_set_odd_parity(&c->hh);
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DES_set_key_unchecked(&c->hh, &k);
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DES_encrypt1(dd, &k, 1);
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ttin0 = tin0 ^ dd[0];
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ttin1 = tin1 ^ dd[1];
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tin0 ^= d[0];
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tin1 ^= d[1];
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p = c->h;
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l2c(tin0, p);
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l2c(ttin1, p);
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p = c->hh;
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l2c(ttin0, p);
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l2c(tin1, p);
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}
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}
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int MDC2_Final(unsigned char *md, MDC2_CTX *c)
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{
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unsigned int i;
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int j;
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i = c->num;
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j = c->pad_type;
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if ((i > 0) || (j == 2)) {
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if (j == 2)
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c->data[i++] = 0x80;
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memset(&(c->data[i]), 0, MDC2_BLOCK - i);
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mdc2_body(c, c->data, MDC2_BLOCK);
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}
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memcpy(md, (char *)c->h, MDC2_BLOCK);
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memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);
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return 1;
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}
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