Litecoin: Scrypt n=1024 Pow hash based upon Colin Percival's Tarnsnap…

… (2009) Modified by Artforz, coblee, pooler, wtogami, Nikolay Belikov, Adrian Gallagher

src/Makefile.am

@@ -251,6 +251,8 @@ crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/hmac_sha512.h \
   crypto/ripemd160.cpp \
   crypto/ripemd160.h \
+  crypto/scrypt.cpp \
+  crypto/scrypt.h \
   crypto/sha1.cpp \
   crypto/sha1.h \
   crypto/sha256.cpp \

src/Makefile.test.include

@@ -120,6 +120,7 @@ BITCOIN_TESTS =\
   test/script_P2SH_tests.cpp \
   test/script_tests.cpp \
   test/scriptnum_tests.cpp \
+  test/scrypt_tests.cpp \
   test/serialize_tests.cpp \
   test/sighash_tests.cpp \
   test/sigopcount_tests.cpp \

src/chain.h

@@ -199,6 +199,9 @@ class CBlockIndex
     unsigned int nBits;
     unsigned int nNonce;
 
+    // Dogecoin: Keep the Scrypt hash as well as SHA256
+    uint256 hashBlockPoW;
+
     //! (memory only) Sequential id assigned to distinguish order in which blocks are received.
     int32_t nSequenceId;
 
@@ -226,6 +229,7 @@ class CBlockIndex
         nTime          = 0;
         nBits          = 0;
         nNonce         = 0;
+        hashBlockPoW   = uint256();
     }
 
     CBlockIndex()
@@ -242,6 +246,7 @@ class CBlockIndex
         nTime          = block.nTime;
         nBits          = block.nBits;
         nNonce         = block.nNonce;
+        hashBlockPoW   = block.GetPoWHash();
     }
 
     CDiskBlockPos GetBlockPos() const {
@@ -280,6 +285,11 @@ class CBlockIndex
         return *phashBlock;
     }
 
+    uint256 GetBlockPoWHash() const
+    {
+        return hashBlockPoW;
+    }
+
     int64_t GetBlockTime() const
     {
         return (int64_t)nTime;
@@ -388,6 +398,7 @@ class CDiskBlockIndex : public CBlockIndex
         READWRITE(nTime);
         READWRITE(nBits);
         READWRITE(nNonce);
+        READWRITE(hashBlockPoW);
     }
 
     uint256 GetBlockHash() const

src/crypto/scrypt-sse2.cpp

@@ -0,0 +1,136 @@
+/*
+ * Copyright 2009 Colin Percival, 2011 ArtForz, 2012-2013 pooler
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * This file was originally written by Colin Percival as part of the Tarsnap
+ * online backup system.
+ */
+
+#include "crypto/scrypt.h"
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <openssl/sha.h>
+
+#include <emmintrin.h>
+
+static inline void xor_salsa8_sse2(__m128i B[4], const __m128i Bx[4])
+{
+	__m128i X0, X1, X2, X3;
+	__m128i T;
+	int i;
+
+	X0 = B[0] = _mm_xor_si128(B[0], Bx[0]);
+	X1 = B[1] = _mm_xor_si128(B[1], Bx[1]);
+	X2 = B[2] = _mm_xor_si128(B[2], Bx[2]);
+	X3 = B[3] = _mm_xor_si128(B[3], Bx[3]);
+
+	for (i = 0; i < 8; i += 2) {
+		/* Operate on "columns". */
+		T = _mm_add_epi32(X0, X3);
+		X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
+		X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
+		T = _mm_add_epi32(X1, X0);
+		X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
+		X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
+		T = _mm_add_epi32(X2, X1);
+		X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 13));
+		X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 19));
+		T = _mm_add_epi32(X3, X2);
+		X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
+		X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
+
+		/* Rearrange data. */
+		X1 = _mm_shuffle_epi32(X1, 0x93);
+		X2 = _mm_shuffle_epi32(X2, 0x4E);
+		X3 = _mm_shuffle_epi32(X3, 0x39);
+
+		/* Operate on "rows". */
+		T = _mm_add_epi32(X0, X1);
+		X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 7));
+		X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 25));
+		T = _mm_add_epi32(X3, X0);
+		X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
+		X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
+		T = _mm_add_epi32(X2, X3);
+		X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 13));
+		X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 19));
+		T = _mm_add_epi32(X1, X2);
+		X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
+		X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
+
+		/* Rearrange data. */
+		X1 = _mm_shuffle_epi32(X1, 0x39);
+		X2 = _mm_shuffle_epi32(X2, 0x4E);
+		X3 = _mm_shuffle_epi32(X3, 0x93);
+	}
+
+	B[0] = _mm_add_epi32(B[0], X0);
+	B[1] = _mm_add_epi32(B[1], X1);
+	B[2] = _mm_add_epi32(B[2], X2);
+	B[3] = _mm_add_epi32(B[3], X3);
+}
+
+void scrypt_1024_1_1_256_sp_sse2(const char *input, char *output, char *scratchpad)
+{
+	uint8_t B[128];
+	union {
+		__m128i i128[8];
+		uint32_t u32[32];
+	} X;
+	__m128i *V;
+	uint32_t i, j, k;
+
+	V = (__m128i *)(((uintptr_t)(scratchpad) + 63) & ~ (uintptr_t)(63));
+
+	PBKDF2_SHA256((const uint8_t *)input, 80, (const uint8_t *)input, 80, 1, B, 128);
+
+	for (k = 0; k < 2; k++) {
+		for (i = 0; i < 16; i++) {
+			X.u32[k * 16 + i] = le32dec(&B[(k * 16 + (i * 5 % 16)) * 4]);
+		}
+	}
+
+	for (i = 0; i < 1024; i++) {
+		for (k = 0; k < 8; k++)
+			V[i * 8 + k] = X.i128[k];
+		xor_salsa8_sse2(&X.i128[0], &X.i128[4]);
+		xor_salsa8_sse2(&X.i128[4], &X.i128[0]);
+	}
+	for (i = 0; i < 1024; i++) {
+		j = 8 * (X.u32[16] & 1023);
+		for (k = 0; k < 8; k++)
+			X.i128[k] = _mm_xor_si128(X.i128[k], V[j + k]);
+		xor_salsa8_sse2(&X.i128[0], &X.i128[4]);
+		xor_salsa8_sse2(&X.i128[4], &X.i128[0]);
+	}
+
+	for (k = 0; k < 2; k++) {
+		for (i = 0; i < 16; i++) {
+			le32enc(&B[(k * 16 + (i * 5 % 16)) * 4], X.u32[k * 16 + i]);
+		}
+	}
+
+	PBKDF2_SHA256((const uint8_t *)input, 80, B, 128, 1, (uint8_t *)output, 32);
+}