1 files changed, 38 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/kdf/kdf2/kdf2.cpp b/comm/third_party/botan/src/lib/kdf/kdf2/kdf2.cpp
new file mode 100644
index 0000000000..4e3bb55832
--- /dev/null
+++ b/comm/third_party/botan/src/lib/kdf/kdf2/kdf2.cpp
@@ -0,0 +1,38 @@
+/*
+* KDF2
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/kdf2.h>
+
+namespace Botan {
+
+size_t KDF2::kdf(uint8_t key[], size_t key_len,
+                 const uint8_t secret[], size_t secret_len,
+                 const uint8_t salt[], size_t salt_len,
+                 const uint8_t label[], size_t label_len) const
+   {
+   uint32_t counter = 1;
+   secure_vector<uint8_t> h;
+
+   size_t offset = 0;
+   while(offset != key_len && counter != 0)
+      {
+      m_hash->update(secret, secret_len);
+      m_hash->update_be(counter++);
+      m_hash->update(label, label_len);
+      m_hash->update(salt, salt_len);
+      m_hash->final(h);
+
+      const size_t added = std::min(h.size(), key_len - offset);
+      copy_mem(&key[offset], h.data(), added);
+      offset += added;
+      }
+
+   // FIXME: returns truncated output
+   return offset;
+   }
+
+}