Move crypto implementations to src/crypto/

4 files changed, 712 insertions, 0 deletions

diff --git a/src/crypto/sha1.cpp b/src/crypto/sha1.cpp
new file mode 100644
index 0000000000..4b2e3e19d1
--- /dev/null
+++ b/src/crypto/sha1.cpp
@@ -0,0 +1,205 @@
+// Copyright (c) 2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "crypto/sha1.h"
+
+#include <string.h>
+
+// Internal implementation code.
+namespace {
+
+/** Read 4 bytes, and interpret them as a 32-bit unsigned big-endian integer. */
+uint32_t inline ReadBE32(const unsigned char *data) {
+    return ((uint32_t)data[0] << 24 | (uint32_t)data[1] << 16 | (uint32_t)data[2] << 8 | (uint32_t)data[3]);
+}
+
+/** Write a 32-bit unsigned big-endian integer. */
+void inline WriteBE32(unsigned char *data, uint32_t x) {
+    data[0] = x >> 24;
+    data[1] = x >> 16;
+    data[2] = x >> 8;
+    data[3] = x;
+}
+
+/// Internal SHA-1 implementation.
+namespace sha1 {
+
+/** One round of SHA-1. */
+void inline Round(uint32_t a, uint32_t &b, uint32_t c, uint32_t d, uint32_t &e,
+                  uint32_t f, uint32_t k, uint32_t w) {
+    e += ((a << 5) | (a >> 27)) + f + k + w;
+    b = (b << 30) | (b >> 2);
+}
+
+uint32_t inline f1(uint32_t b, uint32_t c, uint32_t d) { return d ^ (b & (c ^ d)); }
+uint32_t inline f2(uint32_t b, uint32_t c, uint32_t d) { return b ^ c ^ d; }
+uint32_t inline f3(uint32_t b, uint32_t c, uint32_t d) { return (b & c) | (d & (b | c)); }
+
+uint32_t inline left(uint32_t x) { return (x << 1) | (x >> 31); }
+
+/** Initialize SHA-1 state. */
+void inline Initialize(uint32_t *s) {
+    s[0] = 0x67452301ul;
+    s[1] = 0xEFCDAB89ul;
+    s[2] = 0x98BADCFEul;
+    s[3] = 0x10325476ul;
+    s[4] = 0xC3D2E1F0ul;
+}
+
+const uint32_t k1 = 0x5A827999ul;
+const uint32_t k2 = 0x6ED9EBA1ul;
+const uint32_t k3 = 0x8F1BBCDCul;
+const uint32_t k4 = 0xCA62C1D6ul;
+
+/** Perform a SHA-1 transformation, processing a 64-byte chunk. */
+void Transform(uint32_t *s, const unsigned char *chunk) {
+    uint32_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4];
+    uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
+
+    Round(a, b, c, d, e, f1(b, c, d), k1, w0  = ReadBE32(chunk +  0));
+    Round(e, a, b, c, d, f1(a, b, c), k1, w1  = ReadBE32(chunk +  4));
+    Round(d, e, a, b, c, f1(e, a, b), k1, w2  = ReadBE32(chunk +  8));
+    Round(c, d, e, a, b, f1(d, e, a), k1, w3  = ReadBE32(chunk + 12));
+    Round(b, c, d, e, a, f1(c, d, e), k1, w4  = ReadBE32(chunk + 16));
+    Round(a, b, c, d, e, f1(b, c, d), k1, w5  = ReadBE32(chunk + 20));
+    Round(e, a, b, c, d, f1(a, b, c), k1, w6  = ReadBE32(chunk + 24));
+    Round(d, e, a, b, c, f1(e, a, b), k1, w7  = ReadBE32(chunk + 28));
+    Round(c, d, e, a, b, f1(d, e, a), k1, w8  = ReadBE32(chunk + 32));
+    Round(b, c, d, e, a, f1(c, d, e), k1, w9  = ReadBE32(chunk + 36));
+    Round(a, b, c, d, e, f1(b, c, d), k1, w10 = ReadBE32(chunk + 40));
+    Round(e, a, b, c, d, f1(a, b, c), k1, w11 = ReadBE32(chunk + 44));
+    Round(d, e, a, b, c, f1(e, a, b), k1, w12 = ReadBE32(chunk + 48));
+    Round(c, d, e, a, b, f1(d, e, a), k1, w13 = ReadBE32(chunk + 52));
+    Round(b, c, d, e, a, f1(c, d, e), k1, w14 = ReadBE32(chunk + 56));
+    Round(a, b, c, d, e, f1(b, c, d), k1, w15 = ReadBE32(chunk + 60));
+
+    Round(e, a, b, c, d, f1(a, b, c), k1, w0  = left(w0  ^ w13 ^ w8  ^ w2 ));
+    Round(d, e, a, b, c, f1(e, a, b), k1, w1  = left(w1  ^ w14 ^ w9  ^ w3 ));
+    Round(c, d, e, a, b, f1(d, e, a), k1, w2  = left(w2  ^ w15 ^ w10 ^ w4 ));
+    Round(b, c, d, e, a, f1(c, d, e), k1, w3  = left(w3  ^ w0  ^ w11 ^ w5 ));
+    Round(a, b, c, d, e, f2(b, c, d), k2, w4  = left(w4  ^ w1  ^ w12 ^ w6 ));
+    Round(e, a, b, c, d, f2(a, b, c), k2, w5  = left(w5  ^ w2  ^ w13 ^ w7 ));
+    Round(d, e, a, b, c, f2(e, a, b), k2, w6  = left(w6  ^ w3  ^ w14 ^ w8 ));
+    Round(c, d, e, a, b, f2(d, e, a), k2, w7  = left(w7  ^ w4  ^ w15 ^ w9 ));
+    Round(b, c, d, e, a, f2(c, d, e), k2, w8  = left(w8  ^ w5  ^ w0  ^ w10));
+    Round(a, b, c, d, e, f2(b, c, d), k2, w9  = left(w9  ^ w6  ^ w1  ^ w11));
+    Round(e, a, b, c, d, f2(a, b, c), k2, w10 = left(w10 ^ w7  ^ w2  ^ w12));
+    Round(d, e, a, b, c, f2(e, a, b), k2, w11 = left(w11 ^ w8  ^ w3  ^ w13));
+    Round(c, d, e, a, b, f2(d, e, a), k2, w12 = left(w12 ^ w9  ^ w4  ^ w14));
+    Round(b, c, d, e, a, f2(c, d, e), k2, w13 = left(w13 ^ w10 ^ w5  ^ w15));
+    Round(a, b, c, d, e, f2(b, c, d), k2, w14 = left(w14 ^ w11 ^ w6  ^ w0 ));
+    Round(e, a, b, c, d, f2(a, b, c), k2, w15 = left(w15 ^ w12 ^ w7  ^ w1 ));
+
+    Round(d, e, a, b, c, f2(e, a, b), k2, w0  = left(w0  ^ w13 ^ w8  ^ w2 ));
+    Round(c, d, e, a, b, f2(d, e, a), k2, w1  = left(w1  ^ w14 ^ w9  ^ w3 ));
+    Round(b, c, d, e, a, f2(c, d, e), k2, w2  = left(w2  ^ w15 ^ w10 ^ w4 ));
+    Round(a, b, c, d, e, f2(b, c, d), k2, w3  = left(w3  ^ w0  ^ w11 ^ w5 ));
+    Round(e, a, b, c, d, f2(a, b, c), k2, w4  = left(w4  ^ w1  ^ w12 ^ w6 ));
+    Round(d, e, a, b, c, f2(e, a, b), k2, w5  = left(w5  ^ w2  ^ w13 ^ w7 ));
+    Round(c, d, e, a, b, f2(d, e, a), k2, w6  = left(w6  ^ w3  ^ w14 ^ w8 ));
+    Round(b, c, d, e, a, f2(c, d, e), k2, w7  = left(w7  ^ w4  ^ w15 ^ w9 ));
+    Round(a, b, c, d, e, f3(b, c, d), k3, w8  = left(w8  ^ w5  ^ w0  ^ w10));
+    Round(e, a, b, c, d, f3(a, b, c), k3, w9  = left(w9  ^ w6  ^ w1  ^ w11));
+    Round(d, e, a, b, c, f3(e, a, b), k3, w10 = left(w10 ^ w7  ^ w2  ^ w12));
+    Round(c, d, e, a, b, f3(d, e, a), k3, w11 = left(w11 ^ w8  ^ w3  ^ w13));
+    Round(b, c, d, e, a, f3(c, d, e), k3, w12 = left(w12 ^ w9  ^ w4  ^ w14));
+    Round(a, b, c, d, e, f3(b, c, d), k3, w13 = left(w13 ^ w10 ^ w5  ^ w15));
+    Round(e, a, b, c, d, f3(a, b, c), k3, w14 = left(w14 ^ w11 ^ w6  ^ w0 ));
+    Round(d, e, a, b, c, f3(e, a, b), k3, w15 = left(w15 ^ w12 ^ w7  ^ w1 ));
+
+    Round(c, d, e, a, b, f3(d, e, a), k3, w0  = left(w0  ^ w13 ^ w8  ^ w2 ));
+    Round(b, c, d, e, a, f3(c, d, e), k3, w1  = left(w1  ^ w14 ^ w9  ^ w3 ));
+    Round(a, b, c, d, e, f3(b, c, d), k3, w2  = left(w2  ^ w15 ^ w10 ^ w4 ));
+    Round(e, a, b, c, d, f3(a, b, c), k3, w3  = left(w3  ^ w0  ^ w11 ^ w5 ));
+    Round(d, e, a, b, c, f3(e, a, b), k3, w4  = left(w4  ^ w1  ^ w12 ^ w6 ));
+    Round(c, d, e, a, b, f3(d, e, a), k3, w5  = left(w5  ^ w2  ^ w13 ^ w7 ));
+    Round(b, c, d, e, a, f3(c, d, e), k3, w6  = left(w6  ^ w3  ^ w14 ^ w8 ));
+    Round(a, b, c, d, e, f3(b, c, d), k3, w7  = left(w7  ^ w4  ^ w15 ^ w9 ));
+    Round(e, a, b, c, d, f3(a, b, c), k3, w8  = left(w8  ^ w5  ^ w0  ^ w10));
+    Round(d, e, a, b, c, f3(e, a, b), k3, w9  = left(w9  ^ w6  ^ w1  ^ w11));
+    Round(c, d, e, a, b, f3(d, e, a), k3, w10 = left(w10 ^ w7  ^ w2  ^ w12));
+    Round(b, c, d, e, a, f3(c, d, e), k3, w11 = left(w11 ^ w8  ^ w3  ^ w13));
+    Round(a, b, c, d, e, f2(b, c, d), k4, w12 = left(w12 ^ w9  ^ w4  ^ w14));
+    Round(e, a, b, c, d, f2(a, b, c), k4, w13 = left(w13 ^ w10 ^ w5  ^ w15));
+    Round(d, e, a, b, c, f2(e, a, b), k4, w14 = left(w14 ^ w11 ^ w6  ^ w0 ));
+    Round(c, d, e, a, b, f2(d, e, a), k4, w15 = left(w15 ^ w12 ^ w7  ^ w1 ));
+
+    Round(b, c, d, e, a, f2(c, d, e), k4, w0  = left(w0  ^ w13 ^ w8  ^ w2 ));
+    Round(a, b, c, d, e, f2(b, c, d), k4, w1  = left(w1  ^ w14 ^ w9  ^ w3 ));
+    Round(e, a, b, c, d, f2(a, b, c), k4, w2  = left(w2  ^ w15 ^ w10 ^ w4 ));
+    Round(d, e, a, b, c, f2(e, a, b), k4, w3  = left(w3  ^ w0  ^ w11 ^ w5 ));
+    Round(c, d, e, a, b, f2(d, e, a), k4, w4  = left(w4  ^ w1  ^ w12 ^ w6 ));
+    Round(b, c, d, e, a, f2(c, d, e), k4, w5  = left(w5  ^ w2  ^ w13 ^ w7 ));
+    Round(a, b, c, d, e, f2(b, c, d), k4, w6  = left(w6  ^ w3  ^ w14 ^ w8 ));
+    Round(e, a, b, c, d, f2(a, b, c), k4, w7  = left(w7  ^ w4  ^ w15 ^ w9 ));
+    Round(d, e, a, b, c, f2(e, a, b), k4, w8  = left(w8  ^ w5  ^ w0  ^ w10));
+    Round(c, d, e, a, b, f2(d, e, a), k4, w9  = left(w9  ^ w6  ^ w1  ^ w11));
+    Round(b, c, d, e, a, f2(c, d, e), k4, w10 = left(w10 ^ w7  ^ w2  ^ w12));
+    Round(a, b, c, d, e, f2(b, c, d), k4, w11 = left(w11 ^ w8  ^ w3  ^ w13));
+    Round(e, a, b, c, d, f2(a, b, c), k4, w12 = left(w12 ^ w9  ^ w4  ^ w14));
+    Round(d, e, a, b, c, f2(e, a, b), k4,       left(w13 ^ w10 ^ w5  ^ w15));
+    Round(c, d, e, a, b, f2(d, e, a), k4,       left(w14 ^ w11 ^ w6  ^ w0 ));
+    Round(b, c, d, e, a, f2(c, d, e), k4,       left(w15 ^ w12 ^ w7  ^ w1 ));
+
+    s[0] += a;
+    s[1] += b;
+    s[2] += c;
+    s[3] += d;
+    s[4] += e;
+}
+
+}  // namespace sha1
+
+}  // namespace
+
+////// SHA1
+
+CSHA1::CSHA1() : bytes(0) {
+    sha1::Initialize(s);
+}
+
+CSHA1& CSHA1::Write(const unsigned char *data, size_t len) {
+    const unsigned char *end = data + len;
+    size_t bufsize = bytes % 64;
+    if (bufsize && bufsize + len >= 64) {
+        // Fill the buffer, and process it.
+        memcpy(buf + bufsize, data, 64 - bufsize);
+        bytes += 64 - bufsize;
+        data += 64 - bufsize;
+        sha1::Transform(s, buf);
+        bufsize = 0;
+    }
+    while (end >= data + 64) {
+        // Process full chunks directly from the source.
+        sha1::Transform(s, data);
+        bytes += 64;
+        data += 64;
+    }
+    if (end > data) {
+        // Fill the buffer with what remains.
+        memcpy(buf + bufsize, data, end - data);
+        bytes += end - data;
+    }
+    return *this;
+}
+
+void CSHA1::Finalize(unsigned char *hash) {
+    static const unsigned char pad[64] = {0x80};
+    unsigned char sizedesc[8];
+    WriteBE32(sizedesc, bytes >> 29);
+    WriteBE32(sizedesc+4, bytes << 3);
+    Write(pad, 1 + ((119 - (bytes % 64)) % 64));
+    Write(sizedesc, 8);
+    WriteBE32(hash, s[0]);
+    WriteBE32(hash+4, s[1]);
+    WriteBE32(hash+8, s[2]);
+    WriteBE32(hash+12, s[3]);
+    WriteBE32(hash+16, s[4]);
+}
+
+CSHA1& CSHA1::Reset() {
+    bytes = 0;
+    sha1::Initialize(s);
+    return *this;
+}
diff --git a/src/crypto/sha1.h b/src/crypto/sha1.h
new file mode 100644
index 0000000000..6efde78a5b
--- /dev/null
+++ b/src/crypto/sha1.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_SHA1_H
+#define BITCOIN_SHA1_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for SHA1. */
+class CSHA1 {
+private:
+    uint32_t s[5];
+    unsigned char buf[64];
+    size_t bytes;
+
+public:
+    CSHA1();
+    CSHA1& Write(const unsigned char *data, size_t len);
+    void Finalize(unsigned char *hash);
+    CSHA1& Reset();
+};
+
+#endif
diff --git a/src/crypto/sha2.cpp b/src/crypto/sha2.cpp
new file mode 100644
index 0000000000..0d0c32883f
--- /dev/null
+++ b/src/crypto/sha2.cpp
@@ -0,0 +1,428 @@
+// Copyright (c) 2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "crypto/sha2.h"
+
+#include <string.h>
+
+// Internal implementation code.
+namespace {
+
+/** Read 4 bytes, and interpret them as a 32-bit unsigned big-endian integer. */
+uint32_t inline ReadBE32(const unsigned char *data) {
+    return ((uint32_t)data[0] << 24 | (uint32_t)data[1] << 16 | (uint32_t)data[2] << 8 | (uint32_t)data[3]);
+}
+
+/** Write a 32-bit unsigned big-endian integer. */
+void inline WriteBE32(unsigned char *data, uint32_t x) {
+    data[0] = x >> 24;
+    data[1] = x >> 16;
+    data[2] = x >> 8;
+    data[3] = x;
+}
+
+/** Read 8 bytes, and interpret them as a 64-bit unsigned big-endian integer. */
+uint64_t inline ReadBE64(const unsigned char *data) {
+    return ((uint64_t)data[0] << 56 | (uint64_t)data[1] << 48 | (uint64_t)data[2] << 40 | (uint64_t)data[3] << 32 |
+            (uint64_t)data[4] << 24 | (uint64_t)data[5] << 16 | (uint64_t)data[6] << 8  | (uint64_t)data[7]);
+}
+
+/** Write a 64-bit unsigned big-endian integer. */
+void inline WriteBE64(unsigned char *data, uint64_t x) {
+    data[0] = x >> 56;
+    data[1] = x >> 48;
+    data[2] = x >> 40;
+    data[3] = x >> 32;
+    data[4] = x >> 24;
+    data[5] = x >> 16;
+    data[6] = x >> 8;
+    data[7] = x;
+}
+
+/// Internal SHA-256 implementation.
+namespace sha256 {
+
+uint32_t inline Ch(uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
+uint32_t inline Maj(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (z & (x | y)); }
+uint32_t inline Sigma0(uint32_t x) { return (x >> 2 | x << 30) ^ (x >> 13 | x << 19) ^ (x >> 22 | x << 10); }
+uint32_t inline Sigma1(uint32_t x) { return (x >> 6 | x << 26) ^ (x >> 11 | x << 21) ^ (x >> 25 | x << 7); }
+uint32_t inline sigma0(uint32_t x) { return (x >> 7 | x << 25) ^ (x >> 18 | x << 14) ^ (x >> 3); }
+uint32_t inline sigma1(uint32_t x) { return (x >> 17 | x << 15) ^ (x >> 19 | x << 13) ^ (x >> 10); }
+
+/** One round of SHA-256. */
+void inline Round(uint32_t a, uint32_t b, uint32_t c, uint32_t &d,
+                  uint32_t e, uint32_t f, uint32_t g, uint32_t &h,
+                  uint32_t k, uint32_t w) {
+    uint32_t t1 = h + Sigma1(e) + Ch(e, f, g) + k + w;
+    uint32_t t2 = Sigma0(a) + Maj(a, b, c);
+    d += t1;
+    h = t1 + t2;
+}
+
+/** Initialize SHA-256 state. */
+void inline Initialize(uint32_t *s) {
+    s[0] = 0x6a09e667ul;
+    s[1] = 0xbb67ae85ul;
+    s[2] = 0x3c6ef372ul;
+    s[3] = 0xa54ff53aul;
+    s[4] = 0x510e527ful;
+    s[5] = 0x9b05688cul;
+    s[6] = 0x1f83d9abul;
+    s[7] = 0x5be0cd19ul;
+}
+
+/** Perform one SHA-256 transformation, processing a 64-byte chunk. */
+void Transform(uint32_t *s, const unsigned char *chunk) {
+    uint32_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5], g = s[6], h = s[7];
+    uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
+
+    Round(a, b, c, d, e, f, g, h, 0x428a2f98,  w0 = ReadBE32(chunk + 0));
+    Round(h, a, b, c, d, e, f, g, 0x71374491,  w1 = ReadBE32(chunk + 4));
+    Round(g, h, a, b, c, d, e, f, 0xb5c0fbcf,  w2 = ReadBE32(chunk + 8));
+    Round(f, g, h, a, b, c, d, e, 0xe9b5dba5,  w3 = ReadBE32(chunk + 12));
+    Round(e, f, g, h, a, b, c, d, 0x3956c25b,  w4 = ReadBE32(chunk + 16));
+    Round(d, e, f, g, h, a, b, c, 0x59f111f1,  w5 = ReadBE32(chunk + 20));
+    Round(c, d, e, f, g, h, a, b, 0x923f82a4,  w6 = ReadBE32(chunk + 24));
+    Round(b, c, d, e, f, g, h, a, 0xab1c5ed5,  w7 = ReadBE32(chunk + 28));
+    Round(a, b, c, d, e, f, g, h, 0xd807aa98,  w8 = ReadBE32(chunk + 32));
+    Round(h, a, b, c, d, e, f, g, 0x12835b01,  w9 = ReadBE32(chunk + 36));
+    Round(g, h, a, b, c, d, e, f, 0x243185be, w10 = ReadBE32(chunk + 40));
+    Round(f, g, h, a, b, c, d, e, 0x550c7dc3, w11 = ReadBE32(chunk + 44));
+    Round(e, f, g, h, a, b, c, d, 0x72be5d74, w12 = ReadBE32(chunk + 48));
+    Round(d, e, f, g, h, a, b, c, 0x80deb1fe, w13 = ReadBE32(chunk + 52));
+    Round(c, d, e, f, g, h, a, b, 0x9bdc06a7, w14 = ReadBE32(chunk + 56));
+    Round(b, c, d, e, f, g, h, a, 0xc19bf174, w15 = ReadBE32(chunk + 60));
+
+    Round(a, b, c, d, e, f, g, h, 0xe49b69c1,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0xefbe4786,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x0fc19dc6,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x240ca1cc,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x2de92c6f,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x4a7484aa,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x5cb0a9dc,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x76f988da,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0x983e5152,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0xa831c66d,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0xb00327c8, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0xbf597fc7, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0xc6e00bf3, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xd5a79147, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0x06ca6351, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0x14292967, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    Round(a, b, c, d, e, f, g, h, 0x27b70a85,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0x2e1b2138,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x53380d13,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x650a7354,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x766a0abb,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x81c2c92e,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x92722c85,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0xa2bfe8a1,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0xa81a664b,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0xc24b8b70, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0xc76c51a3, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0xd192e819, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xd6990624, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0xf40e3585, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0x106aa070, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    Round(a, b, c, d, e, f, g, h, 0x19a4c116,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0x1e376c08,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x2748774c,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x34b0bcb5,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x391c0cb3,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x4ed8aa4a,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x5b9cca4f,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x682e6ff3,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0x748f82ee,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0x78a5636f,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0x84c87814, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0x8cc70208, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0x90befffa, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xa4506ceb, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0xbef9a3f7, w14  + sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0xc67178f2, w15  + sigma1(w13) +  w8 + sigma0( w0));
+
+    s[0] += a;
+    s[1] += b;
+    s[2] += c;
+    s[3] += d;
+    s[4] += e;
+    s[5] += f;
+    s[6] += g;
+    s[7] += h;
+}
+
+}  // namespace sha256
+
+/// Internal SHA-512 implementation.
+namespace sha512 {
+
+uint64_t inline Ch(uint64_t x, uint64_t y, uint64_t z) { return z ^ (x & (y ^ z)); }
+uint64_t inline Maj(uint64_t x, uint64_t y, uint64_t z) { return (x & y) | (z & (x | y)); }
+uint64_t inline Sigma0(uint64_t x) { return (x >> 28 | x << 36) ^ (x >> 34 | x << 30) ^ (x >> 39 | x << 25); }
+uint64_t inline Sigma1(uint64_t x) { return (x >> 14 | x << 50) ^ (x >> 18 | x << 46) ^ (x >> 41 | x << 23); }
+uint64_t inline sigma0(uint64_t x) { return (x >> 1 | x << 63) ^ (x >> 8 | x << 56) ^ (x >> 7); }
+uint64_t inline sigma1(uint64_t x) { return (x >> 19 | x << 45) ^ (x >> 61 | x << 3) ^ (x >> 6); }
+
+/** One round of SHA-512. */
+void inline Round(uint64_t a, uint64_t b, uint64_t c, uint64_t &d,
+                  uint64_t e, uint64_t f, uint64_t g, uint64_t &h,
+                  uint64_t k, uint64_t w) {
+    uint64_t t1 = h + Sigma1(e) + Ch(e, f, g) + k + w;
+    uint64_t t2 = Sigma0(a) + Maj(a, b, c);
+    d += t1;
+    h = t1 + t2;
+}
+
+/** Initialize SHA-256 state. */
+void inline Initialize(uint64_t *s) {
+    s[0] = 0x6a09e667f3bcc908ull;
+    s[1] = 0xbb67ae8584caa73bull;
+    s[2] = 0x3c6ef372fe94f82bull;
+    s[3] = 0xa54ff53a5f1d36f1ull;
+    s[4] = 0x510e527fade682d1ull;
+    s[5] = 0x9b05688c2b3e6c1full;
+    s[6] = 0x1f83d9abfb41bd6bull;
+    s[7] = 0x5be0cd19137e2179ull;
+}
+
+/** Perform one SHA-512 transformation, processing a 128-byte chunk. */
+void Transform(uint64_t *s, const unsigned char *chunk) {
+    uint64_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5], g = s[6], h = s[7];
+    uint64_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
+
+    Round(a, b, c, d, e, f, g, h, 0x428a2f98d728ae22ull,  w0 = ReadBE64(chunk + 0));
+    Round(h, a, b, c, d, e, f, g, 0x7137449123ef65cdull,  w1 = ReadBE64(chunk + 8));
+    Round(g, h, a, b, c, d, e, f, 0xb5c0fbcfec4d3b2full,  w2 = ReadBE64(chunk + 16));
+    Round(f, g, h, a, b, c, d, e, 0xe9b5dba58189dbbcull,  w3 = ReadBE64(chunk + 24));
+    Round(e, f, g, h, a, b, c, d, 0x3956c25bf348b538ull,  w4 = ReadBE64(chunk + 32));
+    Round(d, e, f, g, h, a, b, c, 0x59f111f1b605d019ull,  w5 = ReadBE64(chunk + 40));
+    Round(c, d, e, f, g, h, a, b, 0x923f82a4af194f9bull,  w6 = ReadBE64(chunk + 48));
+    Round(b, c, d, e, f, g, h, a, 0xab1c5ed5da6d8118ull,  w7 = ReadBE64(chunk + 56));
+    Round(a, b, c, d, e, f, g, h, 0xd807aa98a3030242ull,  w8 = ReadBE64(chunk + 64));
+    Round(h, a, b, c, d, e, f, g, 0x12835b0145706fbeull,  w9 = ReadBE64(chunk + 72));
+    Round(g, h, a, b, c, d, e, f, 0x243185be4ee4b28cull, w10 = ReadBE64(chunk + 80));
+    Round(f, g, h, a, b, c, d, e, 0x550c7dc3d5ffb4e2ull, w11 = ReadBE64(chunk + 88));
+    Round(e, f, g, h, a, b, c, d, 0x72be5d74f27b896full, w12 = ReadBE64(chunk + 96));
+    Round(d, e, f, g, h, a, b, c, 0x80deb1fe3b1696b1ull, w13 = ReadBE64(chunk + 104));
+    Round(c, d, e, f, g, h, a, b, 0x9bdc06a725c71235ull, w14 = ReadBE64(chunk + 112));
+    Round(b, c, d, e, f, g, h, a, 0xc19bf174cf692694ull, w15 = ReadBE64(chunk + 120));
+
+    Round(a, b, c, d, e, f, g, h, 0xe49b69c19ef14ad2ull,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0xefbe4786384f25e3ull,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x0fc19dc68b8cd5b5ull,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x240ca1cc77ac9c65ull,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x2de92c6f592b0275ull,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x4a7484aa6ea6e483ull,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x5cb0a9dcbd41fbd4ull,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x76f988da831153b5ull,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0x983e5152ee66dfabull,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0xa831c66d2db43210ull,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0xb00327c898fb213full, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0xbf597fc7beef0ee4ull, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0xc6e00bf33da88fc2ull, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xd5a79147930aa725ull, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0x06ca6351e003826full, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0x142929670a0e6e70ull, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    Round(a, b, c, d, e, f, g, h, 0x27b70a8546d22ffcull,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0x2e1b21385c26c926ull,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x4d2c6dfc5ac42aedull,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x53380d139d95b3dfull,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x650a73548baf63deull,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x766a0abb3c77b2a8ull,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x81c2c92e47edaee6ull,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x92722c851482353bull,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0xa2bfe8a14cf10364ull,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0xa81a664bbc423001ull,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0xc24b8b70d0f89791ull, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0xc76c51a30654be30ull, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0xd192e819d6ef5218ull, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xd69906245565a910ull, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0xf40e35855771202aull, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0x106aa07032bbd1b8ull, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    Round(a, b, c, d, e, f, g, h, 0x19a4c116b8d2d0c8ull,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0x1e376c085141ab53ull,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0x2748774cdf8eeb99ull,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0x34b0bcb5e19b48a8ull,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x391c0cb3c5c95a63ull,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x4ed8aa4ae3418acbull,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x5b9cca4f7763e373ull,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x682e6ff3d6b2b8a3ull,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0x748f82ee5defb2fcull,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0x78a5636f43172f60ull,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0x84c87814a1f0ab72ull, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0x8cc702081a6439ecull, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0x90befffa23631e28ull, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0xa4506cebde82bde9ull, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0xbef9a3f7b2c67915ull, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0xc67178f2e372532bull, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    Round(a, b, c, d, e, f, g, h, 0xca273eceea26619cull,  w0 += sigma1(w14) +  w9 + sigma0( w1));
+    Round(h, a, b, c, d, e, f, g, 0xd186b8c721c0c207ull,  w1 += sigma1(w15) + w10 + sigma0( w2));
+    Round(g, h, a, b, c, d, e, f, 0xeada7dd6cde0eb1eull,  w2 += sigma1( w0) + w11 + sigma0( w3));
+    Round(f, g, h, a, b, c, d, e, 0xf57d4f7fee6ed178ull,  w3 += sigma1( w1) + w12 + sigma0( w4));
+    Round(e, f, g, h, a, b, c, d, 0x06f067aa72176fbaull,  w4 += sigma1( w2) + w13 + sigma0( w5));
+    Round(d, e, f, g, h, a, b, c, 0x0a637dc5a2c898a6ull,  w5 += sigma1( w3) + w14 + sigma0( w6));
+    Round(c, d, e, f, g, h, a, b, 0x113f9804bef90daeull,  w6 += sigma1( w4) + w15 + sigma0( w7));
+    Round(b, c, d, e, f, g, h, a, 0x1b710b35131c471bull,  w7 += sigma1( w5) +  w0 + sigma0( w8));
+    Round(a, b, c, d, e, f, g, h, 0x28db77f523047d84ull,  w8 += sigma1( w6) +  w1 + sigma0( w9));
+    Round(h, a, b, c, d, e, f, g, 0x32caab7b40c72493ull,  w9 += sigma1( w7) +  w2 + sigma0(w10));
+    Round(g, h, a, b, c, d, e, f, 0x3c9ebe0a15c9bebcull, w10 += sigma1( w8) +  w3 + sigma0(w11));
+    Round(f, g, h, a, b, c, d, e, 0x431d67c49c100d4cull, w11 += sigma1( w9) +  w4 + sigma0(w12));
+    Round(e, f, g, h, a, b, c, d, 0x4cc5d4becb3e42b6ull, w12 += sigma1(w10) +  w5 + sigma0(w13));
+    Round(d, e, f, g, h, a, b, c, 0x597f299cfc657e2aull, w13 += sigma1(w11) +  w6 + sigma0(w14));
+    Round(c, d, e, f, g, h, a, b, 0x5fcb6fab3ad6faecull, w14 += sigma1(w12) +  w7 + sigma0(w15));
+    Round(b, c, d, e, f, g, h, a, 0x6c44198c4a475817ull, w15 += sigma1(w13) +  w8 + sigma0( w0));
+
+    s[0] += a;
+    s[1] += b;
+    s[2] += c;
+    s[3] += d;
+    s[4] += e;
+    s[5] += f;
+    s[6] += g;
+    s[7] += h;
+}
+
+}  // namespace sha512
+
+}  // namespace
+
+
+////// SHA-256
+
+CSHA256::CSHA256() : bytes(0) {
+    sha256::Initialize(s);
+}
+
+CSHA256& CSHA256::Write(const unsigned char *data, size_t len) {
+    const unsigned char *end = data + len;
+    size_t bufsize = bytes % 64;
+    if (bufsize && bufsize + len >= 64) {
+        // Fill the buffer, and process it.
+        memcpy(buf + bufsize, data, 64 - bufsize);
+        bytes += 64 - bufsize;
+        data += 64 - bufsize;
+        sha256::Transform(s, buf);
+        bufsize = 0;
+    }
+    while (end >= data + 64) {
+        // Process full chunks directly from the source.
+        sha256::Transform(s, data);
+        bytes += 64;
+        data += 64;
+    }
+    if (end > data) {
+        // Fill the buffer with what remains.
+        memcpy(buf + bufsize, data, end - data);
+        bytes += end - data;
+    }
+    return *this;
+}
+
+void CSHA256::Finalize(unsigned char *hash) {
+    static const unsigned char pad[64] = {0x80};
+    unsigned char sizedesc[8];
+    WriteBE64(sizedesc, bytes << 3);
+    Write(pad, 1 + ((119 - (bytes % 64)) % 64));
+    Write(sizedesc, 8);
+    WriteBE32(hash, s[0]);
+    WriteBE32(hash+4, s[1]);
+    WriteBE32(hash+8, s[2]);
+    WriteBE32(hash+12, s[3]);
+    WriteBE32(hash+16, s[4]);
+    WriteBE32(hash+20, s[5]);
+    WriteBE32(hash+24, s[6]);
+    WriteBE32(hash+28, s[7]);
+}
+
+CSHA256& CSHA256::Reset() {
+    bytes = 0;
+    sha256::Initialize(s);
+    return *this;
+}
+
+////// SHA-512
+
+CSHA512::CSHA512() : bytes(0) {
+    sha512::Initialize(s);
+}
+
+CSHA512& CSHA512::Write(const unsigned char *data, size_t len) {
+    const unsigned char *end = data + len;
+    size_t bufsize = bytes % 128;
+    if (bufsize && bufsize + len >= 128) {
+        // Fill the buffer, and process it.
+        memcpy(buf + bufsize, data, 128 - bufsize);
+        bytes += 128 - bufsize;
+        data += 128 - bufsize;
+        sha512::Transform(s, buf);
+        bufsize = 0;
+    }
+    while (end >= data + 128) {
+        // Process full chunks directly from the source.
+        sha512::Transform(s, data);
+        data += 128;
+        bytes += 128;
+    }
+    if (end > data) {
+        // Fill the buffer with what remains.
+        memcpy(buf + bufsize, data, end - data);
+        bytes += end - data;
+    }
+    return *this;
+}
+
+void CSHA512::Finalize(unsigned char *hash) {
+    static const unsigned char pad[128] = {0x80};
+    unsigned char sizedesc[16] = {0x00};
+    WriteBE64(sizedesc+8, bytes << 3);
+    Write(pad, 1 + ((239 - (bytes % 128)) % 128));
+    Write(sizedesc, 16);
+    WriteBE64(hash, s[0]);
+    WriteBE64(hash+8, s[1]);
+    WriteBE64(hash+16, s[2]);
+    WriteBE64(hash+24, s[3]);
+    WriteBE64(hash+32, s[4]);
+    WriteBE64(hash+40, s[5]);
+    WriteBE64(hash+48, s[6]);
+    WriteBE64(hash+56, s[7]);
+}
+
+CSHA512& CSHA512::Reset() {
+    bytes = 0;
+    sha512::Initialize(s);
+    return *this;
+}
+
+////// HMAC-SHA-512
+
+CHMAC_SHA512::CHMAC_SHA512(const unsigned char *key, size_t keylen) {
+    unsigned char rkey[128];
+    if (keylen <= 128) {
+        memcpy(rkey, key, keylen);
+        memset(rkey + keylen, 0, 128 - keylen);
+    } else {
+        CSHA512().Write(key, keylen).Finalize(rkey);
+        memset(rkey + 64, 0, 64);
+    }
+
+    for (int n=0; n<128; n++)
+        rkey[n] ^= 0x5c;
+    outer.Write(rkey, 128);
+
+    for (int n=0; n<128; n++)
+        rkey[n] ^= 0x5c ^ 0x36;
+    inner.Write(rkey, 128);
+}
+
+void CHMAC_SHA512::Finalize(unsigned char *hash) {
+    unsigned char temp[64];
+    inner.Finalize(temp);
+    outer.Write(temp, 64).Finalize(hash);
+}
diff --git a/src/crypto/sha2.h b/src/crypto/sha2.h
new file mode 100644
index 0000000000..001bfc647c
--- /dev/null
+++ b/src/crypto/sha2.h
@@ -0,0 +1,54 @@
+// Copyright (c) 2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_SHA2_H
+#define BITCOIN_SHA2_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for SHA-256. */
+class CSHA256 {
+private:
+    uint32_t s[8];
+    unsigned char buf[64];
+    size_t bytes;
+
+public:
+    CSHA256();
+    CSHA256& Write(const unsigned char *data, size_t len);
+    void Finalize(unsigned char *hash);
+    CSHA256& Reset();
+};
+
+/** A hasher class for SHA-512. */
+class CSHA512 {
+private:
+    uint64_t s[8];
+    unsigned char buf[128];
+    size_t bytes;
+
+public:
+    CSHA512();
+    CSHA512& Write(const unsigned char *data, size_t len);
+    void Finalize(unsigned char *hash);
+    CSHA512& Reset();
+};
+
+/** A hasher class for HMAC-SHA-512. */
+class CHMAC_SHA512 {
+private:
+    CSHA512 outer;
+    CSHA512 inner;
+
+public:
+    CHMAC_SHA512(const unsigned char *key, size_t keylen);
+    CHMAC_SHA512& Write(const unsigned char *data, size_t len) {
+        inner.Write(data, len);
+        return *this;
+    }
+    void Finalize(unsigned char *hash);
+};
+
+#endif