Add built-in RIPEMD-160 implementation

src/crypto/ripemd160.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_RIPEMD160_H
+#define BITCOIN_RIPEMD160_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for RIPEMD-160. */
+class CRIPEMD160 {
+private:
+    uint32_t s[5];
+    unsigned char buf[64];
+    size_t bytes;
+
+public:
+    CRIPEMD160();
+    CRIPEMD160& Write(const unsigned char *data, size_t len);
+    void Finalize(unsigned char *hash);
+    CRIPEMD160& Reset();
+};
+
+#endif