| /* |
| * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /*- |
| * This is a generic 32 bit "collector" for message digest algorithms. |
| * Whenever needed it collects input character stream into chunks of |
| * 32 bit values and invokes a block function that performs actual hash |
| * calculations. |
| * |
| * Porting guide. |
| * |
| * Obligatory macros: |
| * |
| * DATA_ORDER_IS_BIG_ENDIAN or DATA_ORDER_IS_LITTLE_ENDIAN |
| * this macro defines byte order of input stream. |
| * HASH_CBLOCK |
| * size of a unit chunk HASH_BLOCK operates on. |
| * HASH_LONG |
| * has to be at least 32 bit wide. |
| * HASH_CTX |
| * context structure that at least contains following |
| * members: |
| * typedef struct { |
| * ... |
| * HASH_LONG Nl,Nh; |
| * either { |
| * HASH_LONG data[HASH_LBLOCK]; |
| * unsigned char data[HASH_CBLOCK]; |
| * }; |
| * unsigned int num; |
| * ... |
| * } HASH_CTX; |
| * data[] vector is expected to be zeroed upon first call to |
| * HASH_UPDATE. |
| * HASH_UPDATE |
| * name of "Update" function, implemented here. |
| * HASH_TRANSFORM |
| * name of "Transform" function, implemented here. |
| * HASH_FINAL |
| * name of "Final" function, implemented here. |
| * HASH_BLOCK_DATA_ORDER |
| * name of "block" function capable of treating *unaligned* input |
| * message in original (data) byte order, implemented externally. |
| * HASH_MAKE_STRING |
| * macro converting context variables to an ASCII hash string. |
| * |
| * MD5 example: |
| * |
| * #define DATA_ORDER_IS_LITTLE_ENDIAN |
| * |
| * #define HASH_LONG MD5_LONG |
| * #define HASH_CTX MD5_CTX |
| * #define HASH_CBLOCK MD5_CBLOCK |
| * #define HASH_UPDATE MD5_Update |
| * #define HASH_TRANSFORM MD5_Transform |
| * #define HASH_FINAL MD5_Final |
| * #define HASH_BLOCK_DATA_ORDER md5_block_data_order |
| */ |
| |
| #ifndef OSSL_CRYPTO_MD32_COMMON_H |
| # define OSSL_CRYPTO_MD32_COMMON_H |
| # pragma once |
| |
| # include <openssl/crypto.h> |
| |
| # if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN) |
| # error "DATA_ORDER must be defined!" |
| # endif |
| |
| # ifndef HASH_CBLOCK |
| # error "HASH_CBLOCK must be defined!" |
| # endif |
| # ifndef HASH_LONG |
| # error "HASH_LONG must be defined!" |
| # endif |
| # ifndef HASH_CTX |
| # error "HASH_CTX must be defined!" |
| # endif |
| |
| # ifndef HASH_UPDATE |
| # error "HASH_UPDATE must be defined!" |
| # endif |
| # ifndef HASH_TRANSFORM |
| # error "HASH_TRANSFORM must be defined!" |
| # endif |
| # ifndef HASH_FINAL |
| # error "HASH_FINAL must be defined!" |
| # endif |
| |
| # ifndef HASH_BLOCK_DATA_ORDER |
| # error "HASH_BLOCK_DATA_ORDER must be defined!" |
| # endif |
| |
| # define ROTATE(a,n) (((a)<<(n))|(((a)&0xffffffff)>>(32-(n)))) |
| |
| # if defined(DATA_ORDER_IS_BIG_ENDIAN) |
| |
| # define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++)))<<24), \ |
| l|=(((unsigned long)(*((c)++)))<<16), \ |
| l|=(((unsigned long)(*((c)++)))<< 8), \ |
| l|=(((unsigned long)(*((c)++))) ) ) |
| # define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l)>>24)&0xff), \ |
| *((c)++)=(unsigned char)(((l)>>16)&0xff), \ |
| *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ |
| *((c)++)=(unsigned char)(((l) )&0xff), \ |
| l) |
| |
| # elif defined(DATA_ORDER_IS_LITTLE_ENDIAN) |
| |
| # define HOST_c2l(c,l) (l =(((unsigned long)(*((c)++))) ), \ |
| l|=(((unsigned long)(*((c)++)))<< 8), \ |
| l|=(((unsigned long)(*((c)++)))<<16), \ |
| l|=(((unsigned long)(*((c)++)))<<24) ) |
| # define HOST_l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ |
| *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ |
| *((c)++)=(unsigned char)(((l)>>16)&0xff), \ |
| *((c)++)=(unsigned char)(((l)>>24)&0xff), \ |
| l) |
| |
| # endif |
| |
| /* |
| * Time for some action :-) |
| */ |
| |
| int HASH_UPDATE(HASH_CTX *c, const void *data_, size_t len) |
| { |
| const unsigned char *data = data_; |
| unsigned char *p; |
| HASH_LONG l; |
| size_t n; |
| |
| if (len == 0) |
| return 1; |
| |
| l = (c->Nl + (((HASH_LONG) len) << 3)) & 0xffffffffUL; |
| if (l < c->Nl) /* overflow */ |
| c->Nh++; |
| c->Nh += (HASH_LONG) (len >> 29); /* might cause compiler warning on |
| * 16-bit */ |
| c->Nl = l; |
| |
| n = c->num; |
| if (n != 0) { |
| p = (unsigned char *)c->data; |
| |
| if (len >= HASH_CBLOCK || len + n >= HASH_CBLOCK) { |
| memcpy(p + n, data, HASH_CBLOCK - n); |
| HASH_BLOCK_DATA_ORDER(c, p, 1); |
| n = HASH_CBLOCK - n; |
| data += n; |
| len -= n; |
| c->num = 0; |
| /* |
| * We use memset rather than OPENSSL_cleanse() here deliberately. |
| * Using OPENSSL_cleanse() here could be a performance issue. It |
| * will get properly cleansed on finalisation so this isn't a |
| * security problem. |
| */ |
| memset(p, 0, HASH_CBLOCK); /* keep it zeroed */ |
| } else { |
| memcpy(p + n, data, len); |
| c->num += (unsigned int)len; |
| return 1; |
| } |
| } |
| |
| n = len / HASH_CBLOCK; |
| if (n > 0) { |
| HASH_BLOCK_DATA_ORDER(c, data, n); |
| n *= HASH_CBLOCK; |
| data += n; |
| len -= n; |
| } |
| |
| if (len != 0) { |
| p = (unsigned char *)c->data; |
| c->num = (unsigned int)len; |
| memcpy(p, data, len); |
| } |
| return 1; |
| } |
| |
| void HASH_TRANSFORM(HASH_CTX *c, const unsigned char *data) |
| { |
| HASH_BLOCK_DATA_ORDER(c, data, 1); |
| } |
| |
| int HASH_FINAL(unsigned char *md, HASH_CTX *c) |
| { |
| unsigned char *p = (unsigned char *)c->data; |
| size_t n = c->num; |
| |
| p[n] = 0x80; /* there is always room for one */ |
| n++; |
| |
| if (n > (HASH_CBLOCK - 8)) { |
| memset(p + n, 0, HASH_CBLOCK - n); |
| n = 0; |
| HASH_BLOCK_DATA_ORDER(c, p, 1); |
| } |
| memset(p + n, 0, HASH_CBLOCK - 8 - n); |
| |
| p += HASH_CBLOCK - 8; |
| # if defined(DATA_ORDER_IS_BIG_ENDIAN) |
| (void)HOST_l2c(c->Nh, p); |
| (void)HOST_l2c(c->Nl, p); |
| # elif defined(DATA_ORDER_IS_LITTLE_ENDIAN) |
| (void)HOST_l2c(c->Nl, p); |
| (void)HOST_l2c(c->Nh, p); |
| # endif |
| p -= HASH_CBLOCK; |
| HASH_BLOCK_DATA_ORDER(c, p, 1); |
| c->num = 0; |
| OPENSSL_cleanse(p, HASH_CBLOCK); |
| |
| # ifndef HASH_MAKE_STRING |
| # error "HASH_MAKE_STRING must be defined!" |
| # else |
| HASH_MAKE_STRING(c, md); |
| # endif |
| |
| return 1; |
| } |
| |
| # ifndef MD32_REG_T |
| # if defined(__alpha) || defined(__sparcv9) || defined(__mips) |
| # define MD32_REG_T long |
| /* |
| * This comment was originally written for MD5, which is why it |
| * discusses A-D. But it basically applies to all 32-bit digests, |
| * which is why it was moved to common header file. |
| * |
| * In case you wonder why A-D are declared as long and not |
| * as MD5_LONG. Doing so results in slight performance |
| * boost on LP64 architectures. The catch is we don't |
| * really care if 32 MSBs of a 64-bit register get polluted |
| * with eventual overflows as we *save* only 32 LSBs in |
| * *either* case. Now declaring 'em long excuses the compiler |
| * from keeping 32 MSBs zeroed resulting in 13% performance |
| * improvement under SPARC Solaris7/64 and 5% under AlphaLinux. |
| * Well, to be honest it should say that this *prevents* |
| * performance degradation. |
| */ |
| # else |
| /* |
| * Above is not absolute and there are LP64 compilers that |
| * generate better code if MD32_REG_T is defined int. The above |
| * pre-processor condition reflects the circumstances under which |
| * the conclusion was made and is subject to further extension. |
| */ |
| # define MD32_REG_T int |
| # endif |
| # endif |
| |
| #endif |
