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ac4100e10

Denys Vlasenko

2013-01-15

SUCCESS Duration: 174s

Subject

sha3: code shrink

Binary

No binary (build failed)

Architecture & Compiler Flags

Architecture: x86_64-linux-gnu Compiler: gcc (Ubuntu 11.4.0-1ubuntu1~22.04.3) 11.4.0

—

Build Log

(log yok)

Commit Diff GitHub →

libbb/hash_md5_sha.c +36 -26

libbb/hash_md5_sha.c+36 -26

@@ -933,32 +933,40 @@ enum {
	cKeccakNumberOfRounds = 24,
	};

-	static const uint64_t KeccakF_RoundConstants[cKeccakNumberOfRounds] = {
-	0x0000000000000001ULL,
-	0x0000000000008082ULL,
-	0x800000000000808aULL,
-	0x8000000080008000ULL,
-	0x000000000000808bULL,
-	0x0000000080000001ULL,
-	0x8000000080008081ULL,
-	0x8000000000008009ULL,
-	0x000000000000008aULL,
-	0x0000000000000088ULL,
-	0x0000000080008009ULL,
-	0x000000008000000aULL,
-	0x000000008000808bULL,
-	0x800000000000008bULL,
-	0x8000000000008089ULL,
-	0x8000000000008003ULL,
-	0x8000000000008002ULL,
-	0x8000000000000080ULL,
-	0x000000000000800aULL,
-	0x800000008000000aULL,
-	0x8000000080008081ULL,
-	0x8000000000008080ULL,
-	0x0000000080000001ULL,
-	0x8000000080008008ULL
+	/* Elements should be 64-bit, but top half is always zero or 0x80000000.
+	* It is encoded as a separate word below.
+	* Same is true for 31th bits.
+	*/
+	static const uint16_t KeccakF_RoundConstants[cKeccakNumberOfRounds] = {
+	0x0001UL,
+	0x8082UL,
+	0x808aUL,
+	0x8000UL,
+	0x808bUL,
+	0x0001UL,
+	0x8081UL,
+	0x8009UL,
+	0x008aUL,
+	0x0088UL,
+	0x8009UL,
+	0x000aUL,
+	0x808bUL,
+	0x008bUL,
+	0x8089UL,
+	0x8003UL,
+	0x8002UL,
+	0x0080UL,
+	0x800aUL,
+	0x000aUL,
+	0x8081UL,
+	0x8080UL,
+	0x0001UL,
+	0x8008UL
	};
+	/* 0th first - 0011 0011 0000 0111 1101 1101: */
+	#define KeccakF_RoundConstantBit63 ((uint32_t)(0x3307dd00))
+	/* 0th first - 0001 0110 0011 1000 0001 1011: */
+	#define KeccakF_RoundConstantBit31 ((uint32_t)(0x16381b00))

	static const uint8_t KeccakF_RotationConstants[25] = {
	1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62,
@@ -1075,7 +1083,9 @@ static void KeccakF(uint64_t *state)
	}

	/* Iota */
-	state[0] ^= KeccakF_RoundConstants[round];
+	state[0] ^= KeccakF_RoundConstants[round]
+	\| (uint32_t)((KeccakF_RoundConstantBit31 << round) & 0x80000000)
+	\| (uint64_t)((KeccakF_RoundConstantBit63 << round) & 0x80000000) << 32;
	}

	if (BB_BIG_ENDIAN) {