Add a built-in SHA256/SHA512 implementation.

This also moves the HMAC-SHA512 implementation to sha2.cpp.

1 files changed, 54 insertions, 0 deletions

diff --git a/src/sha2.h b/src/sha2.h
new file mode 100644
index 0000000000..001bfc647c
--- /dev/null
+++ b/src/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