1 files changed, 28 insertions, 0 deletions
diff --git a/src/crypto/sha1.h b/src/crypto/sha1.h
new file mode 100644
index 0000000000..8fb20810be
--- /dev/null
+++ b/src/crypto/sha1.h
@@ -0,0 +1,28 @@
+// Copyright (c) 2014 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_CRYPTO_SHA1_H
+#define BITCOIN_CRYPTO_SHA1_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for SHA1. */
+class CSHA1
+{
+private:
+    uint32_t s[5];
+    unsigned char buf[64];
+    uint64_t bytes;
+
+public:
+    static const size_t OUTPUT_SIZE = 20;
+
+    CSHA1();
+    CSHA1& Write(const unsigned char* data, size_t len);
+    void Finalize(unsigned char hash[OUTPUT_SIZE]);
+    CSHA1& Reset();
+};
+
+#endif // BITCOIN_CRYPTO_SHA1_H