From 12dff9801f92d37c330ccf4776da36a3910abec4 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sat, 22 Jun 2013 22:23:22 +0200
Subject: Add HMAC-SHA512 to hash

---
 src/hash.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'src/hash.cpp')

diff --git a/src/hash.cpp b/src/hash.cpp
index bddd8abf3..7b054bd15 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -56,3 +56,44 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
 
     return h1;
 }
+
+int HMAC_SHA512_Init(HMAC_SHA512_CTX *pctx, const void *pkey, size_t len)
+{
+    unsigned char key[128];
+    if (len <= 128)
+    {
+        memcpy(key, pkey, len);
+        memset(key + len, 0, 128-len);
+    }
+    else
+    {
+        SHA512_CTX ctxKey;
+        SHA512_Init(&ctxKey);
+        SHA512_Update(&ctxKey, pkey, len);
+        SHA512_Final(key, &ctxKey);
+        memset(key + 64, 0, 64);
+    }
+
+    for (int n=0; n<128; n++)
+        key[n] ^= 0x5c;
+    SHA512_Init(&pctx->ctxOuter);
+    SHA512_Update(&pctx->ctxOuter, key, 128);
+
+    for (int n=0; n<128; n++)
+        key[n] ^= 0x5c ^ 0x36;
+    SHA512_Init(&pctx->ctxInner);
+    return SHA512_Update(&pctx->ctxInner, key, 128);
+}
+
+int HMAC_SHA512_Update(HMAC_SHA512_CTX *pctx, const void *pdata, size_t len)
+{
+    return SHA512_Update(&pctx->ctxInner, pdata, len);
+}
+
+int HMAC_SHA512_Final(unsigned char *pmd, HMAC_SHA512_CTX *pctx)
+{
+    unsigned char buf[64];
+    SHA512_Final(buf, &pctx->ctxInner);
+    SHA512_Update(&pctx->ctxOuter, buf, 64);
+    return SHA512_Final(pmd, &pctx->ctxOuter);
+}
-- 
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