1 files changed, 36 insertions, 0 deletions
diff --git a/src/lib/pk_pad/mgf1/mgf1.cpp b/src/lib/pk_pad/mgf1/mgf1.cpp
new file mode 100644
index 000000000..eae2fed59
--- /dev/null
+++ b/src/lib/pk_pad/mgf1/mgf1.cpp
@@ -0,0 +1,36 @@
+/*
+* MGF1
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/mgf1.h>
+#include <botan/exceptn.h>
+#include <botan/internal/xor_buf.h>
+#include <algorithm>
+
+namespace Botan {
+
+void mgf1_mask(HashFunction& hash,
+               const byte in[], size_t in_len,
+               byte out[], size_t out_len)
+   {
+   u32bit counter = 0;
+
+   while(out_len)
+      {
+      hash.update(in, in_len);
+      hash.update_be(counter);
+      secure_vector<byte> buffer = hash.final();
+
+      size_t xored = std::min<size_t>(buffer.size(), out_len);
+      xor_buf(out, &buffer[0], xored);
+      out += xored;
+      out_len -= xored;
+
+      ++counter;
+      }
+   }
+
+}