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Issue #16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and unified

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endianess detection and handling.
This commit is contained in:
Christian Heimes 2012-10-17 23:52:17 +02:00
parent 1e9af84e2e
commit 743e0cd6b5
15 changed files with 78 additions and 107 deletions
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22
Modules/sha256module.c
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@ -21,13 +21,6 @@
#include "hashlib.h"
/* Endianness testing and definitions */
#define TestEndianness(variable) {int i=1; variable=PCT_BIG_ENDIAN;\
if (*((char*)&i)==1) variable=PCT_LITTLE_ENDIAN;}
#define PCT_LITTLE_ENDIAN 1
#define PCT_BIG_ENDIAN 0
/* Some useful types */
typedef unsigned char SHA_BYTE;
@ -50,7 +43,6 @@ typedef struct {
SHA_INT32 digest[8]; /* Message digest */
SHA_INT32 count_lo, count_hi; /* 64-bit bit count */
SHA_BYTE data[SHA_BLOCKSIZE]; /* SHA data buffer */
int Endianness;
int local; /* unprocessed amount in data */
int digestsize;
} SHAobject;
@ -58,13 +50,11 @@ typedef struct {
/* When run on a little-endian CPU we need to perform byte reversal on an
array of longwords. */
static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
#if PY_LITTLE_ENDIAN
static void longReverse(SHA_INT32 *buffer, int byteCount)
{
SHA_INT32 value;
if ( Endianness == PCT_BIG_ENDIAN )
return;
byteCount /= sizeof(*buffer);
while (byteCount--) {
value = *buffer;
@ -73,10 +63,10 @@ static void longReverse(SHA_INT32 *buffer, int byteCount, int Endianness)
*buffer++ = ( value << 16 ) | ( value >> 16 );
}
}
#endif
static void SHAcopy(SHAobject *src, SHAobject *dest)
{
dest->Endianness = src->Endianness;
dest->local = src->local;
dest->digestsize = src->digestsize;
dest->count_lo = src->count_lo;
@ -131,7 +121,9 @@ sha_transform(SHAobject *sha_info)
SHA_INT32 S[8], W[64], t0, t1;
memcpy(W, sha_info->data, sizeof(sha_info->data));
longReverse(W, (int)sizeof(sha_info->data), sha_info->Endianness);
#if PY_LITTLE_ENDIAN
longReverse(W, (int)sizeof(sha_info->data));
#endif
for (i = 16; i < 64; ++i) {
W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
@ -228,7 +220,6 @@ sha_transform(SHAobject *sha_info)
static void
sha_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = 0x6A09E667L;
sha_info->digest[1] = 0xBB67AE85L;
sha_info->digest[2] = 0x3C6EF372L;
@ -246,7 +237,6 @@ sha_init(SHAobject *sha_info)
static void
sha224_init(SHAobject *sha_info)
{
TestEndianness(sha_info->Endianness)
sha_info->digest[0] = 0xc1059ed8L;
sha_info->digest[1] = 0x367cd507L;
sha_info->digest[2] = 0x3070dd17L;