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authorRob Landley <rob@landley.net>2012-09-17 00:17:16 -0500
committerRob Landley <rob@landley.net>2012-09-17 00:17:16 -0500
commit3514b035d6457f92069d91c5e2998c037cee3162 (patch)
tree1a91b0515ead0ab0797bf5403966132639510bdd /toys/other/sha1sum.c
parentc64c1069291aa580388dab86caec81c6c19ee615 (diff)
downloadtoybox-3514b035d6457f92069d91c5e2998c037cee3162.tar.gz
Clean up sha1sum, make it use global union properly.
Diffstat (limited to 'toys/other/sha1sum.c')
-rw-r--r--toys/other/sha1sum.c102
1 files changed, 43 insertions, 59 deletions
diff --git a/toys/other/sha1sum.c b/toys/other/sha1sum.c
index e5f336a4..3165effc 100644
--- a/toys/other/sha1sum.c
+++ b/toys/other/sha1sum.c
@@ -20,7 +20,7 @@ config SHA1SUM
#include <toys.h>
-struct sha1 {
+DEFINE_GLOBALS(
uint32_t state[5];
uint32_t oldstate[5];
uint64_t count;
@@ -28,12 +28,9 @@ struct sha1 {
unsigned char c[64];
uint32_t i[16];
} buffer;
-};
+)
-static void sha1_init(struct sha1 *this);
-static void sha1_transform(struct sha1 *this);
-static void sha1_update(struct sha1 *this, char *data, unsigned int len);
-static void sha1_final(struct sha1 *this, char digest[20]);
+#define TT this.sha1sum
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
@@ -52,16 +49,16 @@ static const uint32_t rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
// Hash a single 512-bit block. This is the core of the algorithm.
-static void sha1_transform(struct sha1 *this)
+static void sha1_transform(void)
{
int i, j, k, count;
- uint32_t *block = this->buffer.i;
+ uint32_t *block = TT.buffer.i;
uint32_t *rot[5], *temp;
// Copy context->state[] to working vars
for (i=0; i<5; i++) {
- this->oldstate[i] = this->state[i];
- rot[i] = this->state + i;
+ TT.oldstate[i] = TT.state[i];
+ rot[i] = TT.state + i;
}
// 4 rounds of 20 operations each.
for (i=count=0; i<4; i++) {
@@ -88,55 +85,57 @@ static void sha1_transform(struct sha1 *this)
}
}
// Add the previous values of state[]
- for (i=0; i<5; i++) this->state[i] += this->oldstate[i];
-}
-
-
-// Initialize a struct sha1.
-
-static void sha1_init(struct sha1 *this)
-{
- /* SHA1 initialization constants */
- this->state[0] = 0x67452301;
- this->state[1] = 0xEFCDAB89;
- this->state[2] = 0x98BADCFE;
- this->state[3] = 0x10325476;
- this->state[4] = 0xC3D2E1F0;
- this->count = 0;
+ for (i=0; i<5; i++) TT.state[i] += TT.oldstate[i];
}
// Fill the 64-byte working buffer and call sha1_transform() when full.
-void sha1_update(struct sha1 *this, char *data, unsigned int len)
+static void sha1_update(char *data, unsigned int len)
{
unsigned int i, j;
- j = this->count & 63;
- this->count += len;
+ j = TT.count & 63;
+ TT.count += len;
// Enough data to process a frame?
if ((j + len) > 63) {
i = 64-j;
- memcpy(this->buffer.c + j, data, i);
- sha1_transform(this);
+ memcpy(TT.buffer.c + j, data, i);
+ sha1_transform();
for ( ; i + 63 < len; i += 64) {
- memcpy(this->buffer.c, data + i, 64);
- sha1_transform(this);
+ memcpy(TT.buffer.c, data + i, 64);
+ sha1_transform();
}
j = 0;
} else i = 0;
// Grab remaining chunk
- memcpy(this->buffer.c + j, data + i, len - i);
+ memcpy(TT.buffer.c + j, data + i, len - i);
}
-// Add padding and return the message digest.
+// Callback for loopfiles()
-void sha1_final(struct sha1 *this, char digest[20])
+static void do_sha1(int fd, char *name)
{
- uint64_t count = this->count << 3;
- unsigned int i;
+ uint64_t count;
+ int i;
char buf;
+ /* SHA1 initialization constants */
+ TT.state[0] = 0x67452301;
+ TT.state[1] = 0xEFCDAB89;
+ TT.state[2] = 0x98BADCFE;
+ TT.state[3] = 0x10325476;
+ TT.state[4] = 0xC3D2E1F0;
+ TT.count = 0;
+
+ for (;;) {
+ i = read(fd, toybuf, sizeof(toybuf));
+ if (i<1) break;
+ sha1_update(toybuf, i);
+ }
+
+ count = TT.count << 3;
+
// End the message by appending a "1" bit to the data, ending with the
// message size (in bits, big endian), and adding enough zero bits in
// between to pad to the end of the next 64-byte frame.
@@ -146,34 +145,19 @@ void sha1_final(struct sha1 *this, char digest[20])
buf = 0x80;
do {
- sha1_update(this, &buf, 1);
+ sha1_update(&buf, 1);
buf = 0;
- } while ((this->count & 63) != 56);
+ } while ((TT.count & 63) != 56);
for (i = 0; i < 8; i++)
- this->buffer.c[56+i] = count >> (8*(7-i));
- sha1_transform(this);
+ TT.buffer.c[56+i] = count >> (8*(7-i));
+ sha1_transform();
for (i = 0; i < 20; i++)
- digest[i] = this->state[i>>2] >> ((3-(i & 3)) * 8);
+ toybuf[i] = TT.state[i>>2] >> ((3-(i & 3)) * 8);
// Wipe variables. Cryptogropher paranoia.
- memset(this, 0, sizeof(struct sha1));
-}
-
-// Callback for loopfiles()
+ memset(&TT, 0, sizeof(TT));
-static void do_sha1(int fd, char *name)
-{
- struct sha1 this;
- int len;
-
- sha1_init(&this);
- for (;;) {
- len = read(fd, toybuf, sizeof(toybuf));
- if (len<1) break;
- sha1_update(&this, toybuf, len);
- }
- sha1_final(&this, toybuf);
- for (len = 0; len < 20; len++) printf("%02x", toybuf[len]);
+ for (i = 0; i < 20; i++) printf("%02x", toybuf[i]);
printf(" %s\n", name);
}