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authorRob Landley <rob@landley.net>2012-10-08 21:27:58 -0500
committerRob Landley <rob@landley.net>2012-10-08 21:27:58 -0500
commitb7a3c6bfc51db3e6a1befd07ce2e745dc2bfa05d (patch)
tree8f14676686ccad02a0b0bfe736196313d6741a0c /toys/other/sha1sum.c
parent2d995382e24433b1c724fa3eb653479c1dc19402 (diff)
downloadtoybox-b7a3c6bfc51db3e6a1befd07ce2e745dc2bfa05d.tar.gz
Simplify sha1sum a little.
Diffstat (limited to 'toys/other/sha1sum.c')
-rw-r--r--toys/other/sha1sum.c26
1 files changed, 8 insertions, 18 deletions
diff --git a/toys/other/sha1sum.c b/toys/other/sha1sum.c
index 8833c8de..984baad5 100644
--- a/toys/other/sha1sum.c
+++ b/toys/other/sha1sum.c
@@ -31,28 +31,17 @@ GLOBALS(
} buffer;
)
-#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
-
-// blk0() and blk() perform the initial expand.
-// The idea of expanding during the round function comes from SSLeay
-#if 1
-#define blk0(i) (block[i] = (rol(block[i],24)&0xFF00FF00) \
- |(rol(block[i],8)&0x00FF00FF))
-#else // big endian?
-#define blk0(i) block[i]
-#endif
-#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15] \
- ^block[(i+2)&15]^block[i&15],1))
-static const uint32_t rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
+static const unsigned rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
// Hash a single 512-bit block. This is the core of the algorithm.
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
static void sha1_transform(void)
{
int i, j, k, count;
- uint32_t *block = TT.buffer.i;
- uint32_t *rot[5], *temp;
+ unsigned *block = TT.buffer.i;
+ unsigned *rot[5], *temp;
// Copy context->state[] to working vars
for (i=0; i<5; i++) {
@@ -62,7 +51,7 @@ static void sha1_transform(void)
// 4 rounds of 20 operations each.
for (i=count=0; i<4; i++) {
for (j=0; j<20; j++) {
- uint32_t work;
+ unsigned work;
work = *rot[2] ^ *rot[3];
if (!i) work = (work & *rot[1]) ^ *rot[3];
@@ -71,8 +60,9 @@ static void sha1_transform(void)
work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]);
else work ^= *rot[1];
}
- if (!i && j<16) work += blk0(count);
- else work += blk(count);
+
+ if (!i && j<16) work += block[count] = (rol(block[count],24)&0xFF00FF00) | (rol(block[count],8)&0x00FF00FF);
+ else work += block[count&15] = rol(block[(count+13)&15]^block[(count+8)&15]^block[(count+2)&15]^block[count&15],1);
*rot[4] += work + rol(*rot[0],5) + rconsts[i];
*rot[1] = rol(*rot[1],30);