Add SHA-256 implementation.

11 years ago · 1c0940236a
3 changed files with 231 additions and 1 deletions
--- a/RLP.h
+++ b/RLP.h
@ -17,7 +17,7 @@ using uint = uint64_t;
 using sint = int64_t;

 /**
- * @brief Recursive Linear-Packed data structure.
+ * @brief Class for interpreting Recursive Linear-Prefix Data.
 * @by Gav Wood, 2013
 *
 * Class for reading byte arrays of data in RLP format.
--- a/sha256.cpp
+++ b/sha256.cpp
@ -0,0 +1,171 @@
+/*
+ * Updated to C++, zedwood.com 2012
+ * Based on Olivier Gay's version
+ * See Modified BSD License below:
+ *
+ * FIPS 180-2 SHA-224/256/384/512 implementation
+ * Issue date:  04/30/2005
+ * http://www.ouah.org/ogay/sha2/
+ *
+ * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <cstring>
+#include <fstream>
+#include "sha256.h"
+using namespace std;
+using namespace eth;
+
+const unsigned long SHA256::sha256_k[64] = //UL = uint32
+			{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};
+
+void SHA256::transform(const unsigned char *message, unsigned int block_nb)
+{
+	uint32 w[64];
+	uint32 wv[8];
+	uint32 t1, t2;
+	const unsigned char *sub_block;
+	int i;
+	int j;
+	for (i = 0; i < (int) block_nb; i++) {
+		sub_block = message + (i << 6);
+		for (j = 0; j < 16; j++) {
+			SHA2_PACK32(&sub_block[j << 2], &w[j]);
+		}
+		for (j = 16; j < 64; j++) {
+			w[j] =  SHA256_F4(w[j -  2]) + w[j -  7] + SHA256_F3(w[j - 15]) + w[j - 16];
+		}
+		for (j = 0; j < 8; j++) {
+			wv[j] = m_h[j];
+		}
+		for (j = 0; j < 64; j++) {
+			t1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
+				+ sha256_k[j] + w[j];
+			t2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
+			wv[7] = wv[6];
+			wv[6] = wv[5];
+			wv[5] = wv[4];
+			wv[4] = wv[3] + t1;
+			wv[3] = wv[2];
+			wv[2] = wv[1];
+			wv[1] = wv[0];
+			wv[0] = t1 + t2;
+		}
+		for (j = 0; j < 8; j++) {
+			m_h[j] += wv[j];
+		}
+	}
+}
+
+void SHA256::init()
+{
+	m_h[0] = 0x6a09e667;
+	m_h[1] = 0xbb67ae85;
+	m_h[2] = 0x3c6ef372;
+	m_h[3] = 0xa54ff53a;
+	m_h[4] = 0x510e527f;
+	m_h[5] = 0x9b05688c;
+	m_h[6] = 0x1f83d9ab;
+	m_h[7] = 0x5be0cd19;
+	m_len = 0;
+	m_tot_len = 0;
+}
+
+void SHA256::update(const unsigned char *message, unsigned int len)
+{
+	unsigned int block_nb;
+	unsigned int new_len, rem_len, tmp_len;
+	const unsigned char *shifted_message;
+	tmp_len = SHA224_256_BLOCK_SIZE - m_len;
+	rem_len = len < tmp_len ? len : tmp_len;
+	memcpy(&m_block[m_len], message, rem_len);
+	if (m_len + len < SHA224_256_BLOCK_SIZE) {
+		m_len += len;
+		return;
+	}
+	new_len = len - rem_len;
+	block_nb = new_len / SHA224_256_BLOCK_SIZE;
+	shifted_message = message + rem_len;
+	transform(m_block, 1);
+	transform(shifted_message, block_nb);
+	rem_len = new_len % SHA224_256_BLOCK_SIZE;
+	memcpy(m_block, &shifted_message[block_nb << 6], rem_len);
+	m_len = rem_len;
+	m_tot_len += (block_nb + 1) << 6;
+}
+
+void SHA256::final(unsigned char *digest)
+{
+	unsigned int block_nb;
+	unsigned int pm_len;
+	unsigned int len_b;
+	int i;
+	block_nb = (1 + ((SHA224_256_BLOCK_SIZE - 9)
+					 < (m_len % SHA224_256_BLOCK_SIZE)));
+	len_b = (m_tot_len + m_len) << 3;
+	pm_len = block_nb << 6;
+	memset(m_block + m_len, 0, pm_len - m_len);
+	m_block[m_len] = 0x80;
+	SHA2_UNPACK32(len_b, m_block + pm_len - 4);
+	transform(m_block, block_nb);
+	for (i = 0 ; i < 8; i++) {
+		SHA2_UNPACK32(m_h[i], &digest[i << 2]);
+	}
+}
+
+std::string sha256(std::string input)
+{
+	unsigned char digest[SHA256::DIGEST_SIZE];
+	memset(digest,0,SHA256::DIGEST_SIZE);
+
+	SHA256 ctx = SHA256();
+	ctx.init();
+	ctx.update( (unsigned char*)input.c_str(), input.length());
+	ctx.final(digest);
+
+	char buf[2*SHA256::DIGEST_SIZE+1];
+	buf[2*SHA256::DIGEST_SIZE] = 0;
+	for (unsigned int i = 0; i < SHA256::DIGEST_SIZE; i++)
+		sprintf(buf+i*2, "%02x", digest[i]);
+	return std::string(buf);
+}
--- a/sha256.h
+++ b/sha256.h
@ -0,0 +1,59 @@
+#pragma once
+
+#include <string>
+
+namespace eth
+{
+
+class SHA256
+{
+protected:
+	typedef unsigned char uint8;
+	typedef unsigned long uint32;
+	typedef unsigned long long uint64;
+
+	const static uint32 sha256_k[];
+	static const unsigned int SHA224_256_BLOCK_SIZE = (512/8);
+public:
+	void init();
+	void update(const unsigned char *message, unsigned int len);
+	void final(unsigned char *digest);
+	static const unsigned int DIGEST_SIZE = ( 256 / 8);
+
+protected:
+	void transform(const unsigned char *message, unsigned int block_nb);
+	unsigned int m_tot_len;
+	unsigned int m_len;
+	unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
+	uint32 m_h[8];
+};
+
+std::string sha256(std::string input);
+
+#define SHA2_SHFR(x, n)    (x >> n)
+#define SHA2_ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
+#define SHA2_ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
+#define SHA2_CH(x, y, z)  ((x & y) ^ (~x & z))
+#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+#define SHA256_F1(x) (SHA2_ROTR(x,  2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
+#define SHA256_F2(x) (SHA2_ROTR(x,  6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
+#define SHA256_F3(x) (SHA2_ROTR(x,  7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x,  3))
+#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
+#define SHA2_UNPACK32(x, str)                 \
+{                                             \
+	*((str) + 3) = (uint8) ((x)      );       \
+	*((str) + 2) = (uint8) ((x) >>  8);       \
+	*((str) + 1) = (uint8) ((x) >> 16);       \
+	*((str) + 0) = (uint8) ((x) >> 24);       \
+}
+#define SHA2_PACK32(str, x)                   \
+{                                             \
+	*(x) =   ((uint32) *((str) + 3)      )    \
+		   | ((uint32) *((str) + 2) <<  8)    \
+		   | ((uint32) *((str) + 1) << 16)    \
+		   | ((uint32) *((str) + 0) << 24);   \
+}
+
+}
+
+