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256 lines
7.9 KiB
C
256 lines
7.9 KiB
C
/*
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* Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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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* This is a generic 32 bit "collector" for message digest algorithms.
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* Whenever needed it collects input character stream into chunks of
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* 32 bit values and invokes a block function that performs actual hash
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* calculations.
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*
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* Porting guide.
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*
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* Obligatory macros:
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*
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* DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN
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* this macro defines byte order of input stream.
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* HASH_CBLOCK
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* size of a unit chunk HASH_BLOCK operates on.
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* HASH_LONG
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* has to be at least 32 bit wide.
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* HASH_CTX
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* context structure that at least contains following
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* members:
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* typedef struct {
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* ...
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* HASH_LONG Nl,Nh;
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* either {
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* HASH_LONG data[HASH_LBLOCK];
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* unsigned char data[HASH_CBLOCK];
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* };
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* unsigned int num;
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* ...
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* } HASH_CTX;
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* data[] vector is expected to be zeroed upon first call to
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* HASH_UPDATE.
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* HASH_UPDATE
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* name of "Update" function, implemented here.
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* HASH_TRANSFORM
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* name of "Transform" function, implemented here.
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* HASH_FINAL
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* name of "Final" function, implemented here.
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* HASH_BLOCK_DATA_ORDER
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* name of "block" function capable of treating *unaligned* input
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* message in original (data) byte order, implemented externally.
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* HASH_MAKE_STRING
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* macro converting context variables to an ASCII hash string.
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*
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* MD5 example:
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*
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* #define DATA_ORDER_IS_LITTLE_ENDIAN
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*
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* #define HASH_LONG MD5_LONG
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* #define HASH_CTX MD5_CTX
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* #define HASH_CBLOCK MD5_CBLOCK
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* #define HASH_UPDATE MD5_Update
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* #define HASH_TRANSFORM MD5_Transform
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* #define HASH_FINAL MD5_Final
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* #define HASH_BLOCK_DATA_ORDER md5_block_data_order
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*/
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#include <openssl/crypto.h>
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#if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
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# error "DATA_ORDER must be defined!"
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#endif
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#ifndef HASH_CBLOCK
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# error "HASH_CBLOCK must be defined!"
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#endif
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#ifndef HASH_LONG
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# error "HASH_LONG must be defined!"
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#endif
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#ifndef HASH_CTX
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# error "HASH_CTX must be defined!"
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#endif
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#ifndef HASH_UPDATE
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# error "HASH_UPDATE must be defined!"
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#endif
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#ifndef HASH_TRANSFORM
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# error "HASH_TRANSFORM must be defined!"
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#endif
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#ifndef HASH_FINAL
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# error "HASH_FINAL must be defined!"
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#endif
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#ifndef HASH_BLOCK_DATA_ORDER
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# error "HASH_BLOCK_DATA_ORDER must be defined!"
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#endif
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#define ROTATE(a,n) (((a)<<(n))|(((a)&0xffffffff)>>(32-(n))))
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#if defined(DATA_ORDER_IS_BIG_ENDIAN)
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# define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \
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l|=(((unsigned long)(*((c)++)))<<16), \
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l|=(((unsigned long)(*((c)++)))<< 8), \
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l|=(((unsigned long)(*((c)++))) ) )
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# define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff), \
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l)
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#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
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# define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++))) ), \
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l|=(((unsigned long)(*((c)++)))<< 8), \
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l|=(((unsigned long)(*((c)++)))<<16), \
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l|=(((unsigned long)(*((c)++)))<<24) )
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# define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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l)
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#endif
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/*
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* Time for some action :-)
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*/
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int HASH_UPDATE(HASH_CTX *c, const void *data_, size_t len)
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{
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const unsigned char *data = data_;
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unsigned char *p;
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HASH_LONG l;
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size_t n;
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if (len == 0)
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return 1;
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l = (c->Nl + (((HASH_LONG) len) << 3)) & 0xffffffffUL;
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if (l < c->Nl) /* overflow */
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c->Nh++;
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c->Nh += (HASH_LONG) (len >> 29); /* might cause compiler warning on
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* 16-bit */
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c->Nl = l;
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n = c->num;
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if (n != 0) {
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p = (unsigned char *)c->data;
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if (len >= HASH_CBLOCK || len + n >= HASH_CBLOCK) {
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memcpy(p + n, data, HASH_CBLOCK - n);
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HASH_BLOCK_DATA_ORDER(c, p, 1);
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n = HASH_CBLOCK - n;
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data += n;
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len -= n;
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c->num = 0;
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/*
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* We use memset rather than OPENSSL_cleanse() here deliberately.
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* Using OPENSSL_cleanse() here could be a performance issue. It
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* will get properly cleansed on finalisation so this isn't a
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* security problem.
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*/
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memset(p, 0, HASH_CBLOCK); /* keep it zeroed */
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} else {
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memcpy(p + n, data, len);
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c->num += (unsigned int)len;
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return 1;
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}
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}
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n = len / HASH_CBLOCK;
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if (n > 0) {
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HASH_BLOCK_DATA_ORDER(c, data, n);
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n *= HASH_CBLOCK;
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data += n;
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len -= n;
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}
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if (len != 0) {
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p = (unsigned char *)c->data;
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c->num = (unsigned int)len;
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memcpy(p, data, len);
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}
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return 1;
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}
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void HASH_TRANSFORM(HASH_CTX *c, const unsigned char *data)
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{
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HASH_BLOCK_DATA_ORDER(c, data, 1);
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}
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int HASH_FINAL(unsigned char *md, HASH_CTX *c)
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{
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unsigned char *p = (unsigned char *)c->data;
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size_t n = c->num;
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p[n] = 0x80; /* there is always room for one */
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n++;
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if (n > (HASH_CBLOCK - 8)) {
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memset(p + n, 0, HASH_CBLOCK - n);
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n = 0;
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HASH_BLOCK_DATA_ORDER(c, p, 1);
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}
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memset(p + n, 0, HASH_CBLOCK - 8 - n);
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p += HASH_CBLOCK - 8;
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#if defined(DATA_ORDER_IS_BIG_ENDIAN)
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(void)HOST_l2c(c->Nh, p);
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(void)HOST_l2c(c->Nl, p);
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#elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
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(void)HOST_l2c(c->Nl, p);
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(void)HOST_l2c(c->Nh, p);
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#endif
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p -= HASH_CBLOCK;
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HASH_BLOCK_DATA_ORDER(c, p, 1);
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c->num = 0;
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OPENSSL_cleanse(p, HASH_CBLOCK);
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#ifndef HASH_MAKE_STRING
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# error "HASH_MAKE_STRING must be defined!"
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#else
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HASH_MAKE_STRING(c, md);
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#endif
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return 1;
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}
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#ifndef MD32_REG_T
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# if defined(__alpha) || defined(__sparcv9) || defined(__mips)
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# define MD32_REG_T long
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/*
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* This comment was originally written for MD5, which is why it
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* discusses A-D. But it basically applies to all 32-bit digests,
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* which is why it was moved to common header file.
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*
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* In case you wonder why A-D are declared as long and not
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* as MD5_LONG. Doing so results in slight performance
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* boost on LP64 architectures. The catch is we don't
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* really care if 32 MSBs of a 64-bit register get polluted
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* with eventual overflows as we *save* only 32 LSBs in
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* *either* case. Now declaring 'em long excuses the compiler
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* from keeping 32 MSBs zeroed resulting in 13% performance
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* improvement under SPARC Solaris7/64 and 5% under AlphaLinux.
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* Well, to be honest it should say that this *prevents*
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* performance degradation.
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*/
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# else
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/*
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* Above is not absolute and there are LP64 compilers that
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* generate better code if MD32_REG_T is defined int. The above
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* pre-processor condition reflects the circumstances under which
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* the conclusion was made and is subject to further extension.
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*/
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# define MD32_REG_T int
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# endif
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#endif
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