1 files changed, 125 insertions, 0 deletions
diff --git a/src/mode_pad.cpp b/src/mode_pad.cpp
new file mode 100644
index 000000000..7fbcb2fc4
--- /dev/null
+++ b/src/mode_pad.cpp
@@ -0,0 +1,125 @@
+/*************************************************
+* CBC Padding Methods Source File                *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/mode_pad.h>
+#include <botan/util.h>
+
+namespace Botan {
+
+/*************************************************
+* Default amount of padding                      *
+*************************************************/
+u32bit BlockCipherModePaddingMethod::pad_bytes(u32bit bs, u32bit pos) const
+   {
+   return (bs - pos);
+   }
+
+/*************************************************
+* Pad with PKCS #7 Method                        *
+*************************************************/
+void PKCS7_Padding::pad(byte block[], u32bit size, u32bit position) const
+   {
+   for(u32bit j = 0; j != size; ++j)
+      block[j] = (size-position);
+   }
+
+/*************************************************
+* Unpad with PKCS #7 Method                      *
+*************************************************/
+u32bit PKCS7_Padding::unpad(const byte block[], u32bit size) const
+   {
+   u32bit position = block[size-1];
+   if(position > size)
+      throw Decoding_Error(name());
+   for(u32bit j = size-position; j != size-1; ++j)
+      if(block[j] != position)
+         throw Decoding_Error(name());
+   return (size-position);
+   }
+
+/*************************************************
+* Query if the size is valid for this method     *
+*************************************************/
+bool PKCS7_Padding::valid_blocksize(u32bit size) const
+   {
+   if(size > 0 && size < 256)
+      return true;
+   else
+      return false;
+   }
+
+/*************************************************
+* Pad with ANSI X9.23 Method                     *
+*************************************************/
+void ANSI_X923_Padding::pad(byte block[], u32bit size, u32bit position) const
+   {
+   for(u32bit j = 0; j != size-position; ++j)
+      block[j] = 0;
+   block[size-position-1] = (size-position);
+   }
+
+/*************************************************
+* Unpad with ANSI X9.23 Method                   *
+*************************************************/
+u32bit ANSI_X923_Padding::unpad(const byte block[], u32bit size) const
+   {
+   u32bit position = block[size-1];
+   if(position > size)
+      throw Decoding_Error(name());
+   for(u32bit j = size-position; j != size-1; ++j)
+      if(block[j] != 0)
+         throw Decoding_Error(name());
+   return (size-position);
+   }
+
+/*************************************************
+* Query if the size is valid for this method     *
+*************************************************/
+bool ANSI_X923_Padding::valid_blocksize(u32bit size) const
+   {
+   if(size > 0 && size < 256)
+      return true;
+   else
+      return false;
+   }
+
+/*************************************************
+* Pad with One and Zeros Method                  *
+*************************************************/
+void OneAndZeros_Padding::pad(byte block[], u32bit size, u32bit) const
+   {
+   block[0] = 0x80;
+   for(u32bit j = 1; j != size; ++j)
+      block[j] = 0x00;
+   }
+
+/*************************************************
+* Unpad with One and Zeros Method                *
+*************************************************/
+u32bit OneAndZeros_Padding::unpad(const byte block[], u32bit size) const
+   {
+   while(size)
+      {
+      if(block[size-1] == 0x80)
+         break;
+      if(block[size-1] != 0x00)
+         throw Decoding_Error(name());
+      size--;
+      }
+   if(!size)
+      throw Decoding_Error(name());
+   return (size-1);
+   }
+
+/*************************************************
+* Query if the size is valid for this method     *
+*************************************************/
+bool OneAndZeros_Padding::valid_blocksize(u32bit size) const
+   {
+   if(size) return true;
+   else     return false;
+   }
+
+}