1 files changed, 80 insertions, 0 deletions
diff --git a/src/s2k/pbkdf2/pbkdf2.cpp b/src/s2k/pbkdf2/pbkdf2.cpp
new file mode 100644
index 000000000..baa227526
--- /dev/null
+++ b/src/s2k/pbkdf2/pbkdf2.cpp
@@ -0,0 +1,80 @@
+/*************************************************
+* PBKDF2 Source File                             *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/pbkdf2.h>
+#include <botan/loadstor.h>
+#include <botan/xor_buf.h>
+
+namespace Botan {
+
+/*************************************************
+* Return a PKCS#5 PBKDF2 derived key             *
+*************************************************/
+OctetString PKCS5_PBKDF2::derive(u32bit key_len,
+                                 const std::string& passphrase,
+                                 const byte salt[], u32bit salt_size,
+                                 u32bit iterations) const
+   {
+   if(iterations == 0)
+      throw Invalid_Argument("PKCS#5 PBKDF2: Invalid iteration count");
+
+   if(passphrase.length() == 0)
+      throw Invalid_Argument("PKCS#5 PBKDF2: Empty passphrase is invalid");
+
+   mac->set_key(reinterpret_cast<const byte*>(passphrase.data()),
+                passphrase.length());
+
+   SecureVector<byte> key(key_len);
+
+   byte* T = key.begin();
+
+   u32bit counter = 1;
+   while(key_len)
+      {
+      u32bit T_size = std::min(mac->OUTPUT_LENGTH, key_len);
+      SecureVector<byte> U(mac->OUTPUT_LENGTH);
+
+      mac->update(salt, salt_size);
+      for(u32bit j = 0; j != 4; ++j)
+         mac->update(get_byte(j, counter));
+      mac->final(U);
+      xor_buf(T, U, T_size);
+
+      for(u32bit j = 1; j != iterations; ++j)
+         {
+         mac->update(U);
+         mac->final(U);
+         xor_buf(T, U, T_size);
+         }
+
+      key_len -= T_size;
+      T += T_size;
+      ++counter;
+      }
+
+   return key;
+   }
+
+/*************************************************
+* Return the name of this type                   *
+*************************************************/
+std::string PKCS5_PBKDF2::name() const
+   {
+   return "PBKDF2(" + mac->name() + ")";
+   }
+
+S2K* PKCS5_PBKDF2::clone() const
+   {
+   return new PKCS5_PBKDF2(mac->clone());
+   }
+
+/*************************************************
+* PKCS5_PBKDF2 Constructor                       *
+*************************************************/
+PKCS5_PBKDF2::PKCS5_PBKDF2(MessageAuthenticationCode* m) : mac(m) {}
+
+PKCS5_PBKDF2::~PKCS5_PBKDF2() { delete mac; }
+
+}