1 files changed, 39 insertions, 0 deletions
diff --git a/Swiften/StringCodecs/HMACSHA1.cpp b/Swiften/StringCodecs/HMACSHA1.cpp
new file mode 100644
index 0000000..59f1482
--- /dev/null
+++ b/Swiften/StringCodecs/HMACSHA1.cpp
@@ -0,0 +1,39 @@
+#include "Swiften/StringCodecs/HMACSHA1.h"
+
+#include <cassert>
+
+#include "Swiften/StringCodecs/SHA1.h"
+#include "Swiften/Base/ByteArray.h"
+
+namespace Swift {
+
+static const unsigned int B = 64;
+
+ByteArray HMACSHA1::getResult(const ByteArray& key, const ByteArray& data) {
+	assert(key.getSize() <= B);
+
+	// Create the padded key
+	ByteArray paddedKey(key);
+	paddedKey.resize(B);
+	for (unsigned int i = key.getSize(); i < paddedKey.getSize(); ++i) {
+		paddedKey[i] = 0x0;
+	}
+
+	// Create the first value
+	ByteArray x(paddedKey);
+	for (unsigned int i = 0; i < x.getSize(); ++i) {
+		x[i] ^= 0x36;
+	}
+	x += data;
+
+	// Create the second value
+	ByteArray y(paddedKey);
+	for (unsigned int i = 0; i < y.getSize(); ++i) {
+		y[i] ^= 0x5c;
+	}
+	y += SHA1::getBinaryHash(x);
+
+	return SHA1::getBinaryHash(y);
+}
+
+}