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-rw-r--r--src/modes/mode_pad/mode_pad.cpp125
-rw-r--r--src/modes/mode_pad/mode_pad.h79
-rw-r--r--src/modes/mode_pad/modinfo.txt10
3 files changed, 214 insertions, 0 deletions
diff --git a/src/modes/mode_pad/mode_pad.cpp b/src/modes/mode_pad/mode_pad.cpp
new file mode 100644
index 000000000..3a07afcb4
--- /dev/null
+++ b/src/modes/mode_pad/mode_pad.cpp
@@ -0,0 +1,125 @@
+/*************************************************
+* CBC Padding Methods Source File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#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;
+ }
+
+}
diff --git a/src/modes/mode_pad/mode_pad.h b/src/modes/mode_pad/mode_pad.h
new file mode 100644
index 000000000..4041efcdc
--- /dev/null
+++ b/src/modes/mode_pad/mode_pad.h
@@ -0,0 +1,79 @@
+/*************************************************
+* CBC Padding Methods Header File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#ifndef BOTAN_CBC_PADDING_H__
+#define BOTAN_CBC_PADDING_H__
+
+#include <botan/base.h>
+#include <string>
+
+namespace Botan {
+
+/*************************************************
+* Block Cipher Mode Padding Method *
+*************************************************/
+class BOTAN_DLL BlockCipherModePaddingMethod
+ {
+ public:
+ virtual void pad(byte[], u32bit, u32bit) const = 0;
+ virtual u32bit unpad(const byte[], u32bit) const = 0;
+ virtual u32bit pad_bytes(u32bit, u32bit) const;
+ virtual bool valid_blocksize(u32bit) const = 0;
+ virtual std::string name() const = 0;
+ virtual ~BlockCipherModePaddingMethod() {}
+ };
+
+/*************************************************
+* PKCS#7 Padding *
+*************************************************/
+class BOTAN_DLL PKCS7_Padding : public BlockCipherModePaddingMethod
+ {
+ public:
+ void pad(byte[], u32bit, u32bit) const;
+ u32bit unpad(const byte[], u32bit) const;
+ bool valid_blocksize(u32bit) const;
+ std::string name() const { return "PKCS7"; }
+ };
+
+/*************************************************
+* ANSI X9.23 Padding *
+*************************************************/
+class BOTAN_DLL ANSI_X923_Padding : public BlockCipherModePaddingMethod
+ {
+ public:
+ void pad(byte[], u32bit, u32bit) const;
+ u32bit unpad(const byte[], u32bit) const;
+ bool valid_blocksize(u32bit) const;
+ std::string name() const { return "X9.23"; }
+ };
+
+/*************************************************
+* One And Zeros Padding *
+*************************************************/
+class BOTAN_DLL OneAndZeros_Padding : public BlockCipherModePaddingMethod
+ {
+ public:
+ void pad(byte[], u32bit, u32bit) const;
+ u32bit unpad(const byte[], u32bit) const;
+ bool valid_blocksize(u32bit) const;
+ std::string name() const { return "OneAndZeros"; }
+ };
+
+/*************************************************
+* Null Padding *
+*************************************************/
+class BOTAN_DLL Null_Padding : public BlockCipherModePaddingMethod
+ {
+ public:
+ void pad(byte[], u32bit, u32bit) const { return; }
+ u32bit unpad(const byte[], u32bit size) const { return size; }
+ u32bit pad_bytes(u32bit, u32bit) const { return 0; }
+ bool valid_blocksize(u32bit) const { return true; }
+ std::string name() const { return "NoPadding"; }
+ };
+
+}
+
+#endif
diff --git a/src/modes/mode_pad/modinfo.txt b/src/modes/mode_pad/modinfo.txt
new file mode 100644
index 000000000..f22cf7411
--- /dev/null
+++ b/src/modes/mode_pad/modinfo.txt
@@ -0,0 +1,10 @@
+realname "Cipher Mode Padding Method"
+
+define CIPHER_MODE_PADDING
+
+load_on auto
+
+<add>
+mode_pad.cpp
+mode_pad.h
+</add>
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