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-rw-r--r--src/sha256.c190
1 files changed, 92 insertions, 98 deletions
diff --git a/src/sha256.c b/src/sha256.c
index e5ba5dd..0bb29af 100644
--- a/src/sha256.c
+++ b/src/sha256.c
@@ -6,46 +6,43 @@
* clean-up and argument order for sha256_hash (feh).
*/
+#include "sha256.h"
+
#include <stdint.h>
#include <string.h>
-#include "sha256.h"
// DBL_INT_ADD treats two unsigned ints a and b as one 64-bit integer and adds c to it
-#define DBL_INT_ADD(a,b,c) if (a > 0xffffffff - (c)) ++b; a += c;
-#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
-#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
+#define DBL_INT_ADD(a, b, c) \
+ if (a > 0xffffffff - (c)) ++b; \
+ a += c;
+#define ROTLEFT(a, b) (((a) << (b)) | ((a) >> (32 - (b))))
+#define ROTRIGHT(a, b) (((a) >> (b)) | ((a) << (32 - (b))))
-#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
-#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
-#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
-#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
-#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
-#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
+#define CH(x, y, z) (((x) & (y)) ^ (~(x) & (z)))
+#define MAJ(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+#define EP0(x) (ROTRIGHT(x, 2) ^ ROTRIGHT(x, 13) ^ ROTRIGHT(x, 22))
+#define EP1(x) (ROTRIGHT(x, 6) ^ ROTRIGHT(x, 11) ^ ROTRIGHT(x, 25))
+#define SIG0(x) (ROTRIGHT(x, 7) ^ ROTRIGHT(x, 18) ^ ((x) >> 3))
+#define SIG1(x) (ROTRIGHT(x, 17) ^ ROTRIGHT(x, 19) ^ ((x) >> 10))
-uint32_t k[64] =
-{
- 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
- 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
- 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
- 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
- 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
- 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
- 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
- 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
- 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
- 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
- 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
-};
+uint32_t k[64] = {
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+ 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+ 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+ 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+ 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+ 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
static void sha256_transform(sha256_ctx *ctx, uint8_t *data)
-{
+{
uint32_t a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
-
+
for (i = 0, j = 0; i < 16; ++i, j += 4)
- m[i] = (data[j] << 24) | (data[j+1] << 16) | (data[j+2] << 8) | (data[j+3]);
- for (; i < 64; ++i)
- m[i] = SIG1(m[i-2]) + m[i-7] + SIG0(m[i-15]) + m[i-16];
+ m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
+ for (; i < 64; ++i) m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];
a = ctx->state[0];
b = ctx->state[1];
@@ -55,10 +52,10 @@ static void sha256_transform(sha256_ctx *ctx, uint8_t *data)
f = ctx->state[5];
g = ctx->state[6];
h = ctx->state[7];
-
+
for (i = 0; i < 64; ++i) {
- t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
- t2 = EP0(a) + MAJ(a,b,c);
+ t1 = h + EP1(e) + CH(e, f, g) + k[i] + m[i];
+ t2 = EP0(a) + MAJ(a, b, c);
h = g;
g = f;
f = e;
@@ -68,7 +65,7 @@ static void sha256_transform(sha256_ctx *ctx, uint8_t *data)
b = a;
a = t1 + t2;
}
-
+
ctx->state[0] += a;
ctx->state[1] += b;
ctx->state[2] += c;
@@ -80,10 +77,10 @@ static void sha256_transform(sha256_ctx *ctx, uint8_t *data)
}
static void sha256_init(sha256_ctx *ctx)
-{
- ctx->datalen = 0;
- ctx->bitlen[0] = 0;
- ctx->bitlen[1] = 0;
+{
+ ctx->datalen = 0;
+ ctx->bitlen[0] = 0;
+ ctx->bitlen[1] = 0;
ctx->state[0] = 0x6a09e667;
ctx->state[1] = 0xbb67ae85;
ctx->state[2] = 0x3c6ef372;
@@ -95,73 +92,70 @@ static void sha256_init(sha256_ctx *ctx)
}
static void sha256_update(sha256_ctx *ctx, uint8_t *data, uint32_t len)
-{
+{
uint32_t i;
-
- for (i=0; i < len; ++i) {
- ctx->data[ctx->datalen] = data[i];
- ctx->datalen++;
- if (ctx->datalen == 64) {
- sha256_transform(ctx,ctx->data);
- DBL_INT_ADD(ctx->bitlen[0],ctx->bitlen[1],512);
- ctx->datalen = 0;
- }
- }
-}
-
-static void sha256_final(uint8_t *hash,sha256_ctx *ctx)
-{
- uint32_t i;
-
- i = ctx->datalen;
-
-// Pad whatever data is left in the buffer.
-
- if (ctx->datalen < 56) {
- ctx->data[i++] = 0x80;
- while (i < 56)
- ctx->data[i++] = 0x00;
+
+ for (i = 0; i < len; ++i) {
+ ctx->data[ctx->datalen] = data[i];
+ ctx->datalen++;
+ if (ctx->datalen == 64) {
+ sha256_transform(ctx, ctx->data);
+ DBL_INT_ADD(ctx->bitlen[0], ctx->bitlen[1], 512);
+ ctx->datalen = 0;
+ }
}
- else {
- ctx->data[i++] = 0x80;
- while (i < 64)
- ctx->data[i++] = 0x00;
- sha256_transform(ctx,ctx->data);
- memset(ctx->data,0,56);
- }
-
-// Append to the padding the total message's length in bits and transform.
-
- DBL_INT_ADD(ctx->bitlen[0],ctx->bitlen[1],ctx->datalen * 8);
- ctx->data[63] = ctx->bitlen[0];
- ctx->data[62] = ctx->bitlen[0] >> 8;
- ctx->data[61] = ctx->bitlen[0] >> 16;
- ctx->data[60] = ctx->bitlen[0] >> 24;
- ctx->data[59] = ctx->bitlen[1];
- ctx->data[58] = ctx->bitlen[1] >> 8;
- ctx->data[57] = ctx->bitlen[1] >> 16;
- ctx->data[56] = ctx->bitlen[1] >> 24;
- sha256_transform(ctx,ctx->data);
-
-// Since this implementation uses little endian byte ordering and SHA uses
-// big endian, reverse all the bytes when copying the final state to the output hash.
-
- for (i = 0; i < 4; ++i) {
- hash[i] = (ctx->state[0] >> (24-i*8)) & 0x000000ff;
- hash[i+4] = (ctx->state[1] >> (24-i*8)) & 0x000000ff;
- hash[i+8] = (ctx->state[2] >> (24-i*8)) & 0x000000ff;
- hash[i+12] = (ctx->state[3] >> (24-i*8)) & 0x000000ff;
- hash[i+16] = (ctx->state[4] >> (24-i*8)) & 0x000000ff;
- hash[i+20] = (ctx->state[5] >> (24-i*8)) & 0x000000ff;
- hash[i+24] = (ctx->state[6] >> (24-i*8)) & 0x000000ff;
- hash[i+28] = (ctx->state[7] >> (24-i*8)) & 0x000000ff;
+}
+
+static void sha256_final(uint8_t *hash, sha256_ctx *ctx)
+{
+ uint32_t i;
+
+ i = ctx->datalen;
+
+ // Pad whatever data is left in the buffer.
+
+ if (ctx->datalen < 56) {
+ ctx->data[i++] = 0x80;
+ while (i < 56) ctx->data[i++] = 0x00;
+ } else {
+ ctx->data[i++] = 0x80;
+ while (i < 64) ctx->data[i++] = 0x00;
+ sha256_transform(ctx, ctx->data);
+ memset(ctx->data, 0, 56);
+ }
+
+ // Append to the padding the total message's length in bits and transform.
+
+ DBL_INT_ADD(ctx->bitlen[0], ctx->bitlen[1], ctx->datalen * 8);
+ ctx->data[63] = ctx->bitlen[0];
+ ctx->data[62] = ctx->bitlen[0] >> 8;
+ ctx->data[61] = ctx->bitlen[0] >> 16;
+ ctx->data[60] = ctx->bitlen[0] >> 24;
+ ctx->data[59] = ctx->bitlen[1];
+ ctx->data[58] = ctx->bitlen[1] >> 8;
+ ctx->data[57] = ctx->bitlen[1] >> 16;
+ ctx->data[56] = ctx->bitlen[1] >> 24;
+ sha256_transform(ctx, ctx->data);
+
+ // Since this implementation uses little endian byte ordering and SHA uses
+ // big endian, reverse all the bytes when copying the final state to the output hash.
+
+ for (i = 0; i < 4; ++i) {
+ hash[i] = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 4] = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 8] = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
+ hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
}
}
-extern void sha256_hash(char *hash,const char *data,size_t len)
+extern void sha256_hash(char *hash, const char *data, size_t len)
{
sha256_ctx ctx;
sha256_init(&ctx);
- sha256_update(&ctx,(uint8_t *)data,(int)len);
- sha256_final((uint8_t *)hash,&ctx);
+ sha256_update(&ctx, (uint8_t *)data, (int)len);
+ sha256_final((uint8_t *)hash, &ctx);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 02:55:50 +0000