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-rw-r--r--old/botan/src/modes/mode_pad/info.txt10
-rw-r--r--old/botan/src/modes/mode_pad/mode_pad.cpp128
-rw-r--r--old/botan/src/modes/mode_pad/mode_pad.h120
3 files changed, 258 insertions, 0 deletions
diff --git a/old/botan/src/modes/mode_pad/info.txt b/old/botan/src/modes/mode_pad/info.txt
new file mode 100644
index 0000000..f22cf74
--- /dev/null
+++ b/old/botan/src/modes/mode_pad/info.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>
diff --git a/old/botan/src/modes/mode_pad/mode_pad.cpp b/old/botan/src/modes/mode_pad/mode_pad.cpp
new file mode 100644
index 0000000..b8badd7
--- /dev/null
+++ b/old/botan/src/modes/mode_pad/mode_pad.cpp
@@ -0,0 +1,128 @@
+/*
+* CBC Padding Methods
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/mode_pad.h>
+#include <botan/exceptn.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/old/botan/src/modes/mode_pad/mode_pad.h b/old/botan/src/modes/mode_pad/mode_pad.h
new file mode 100644
index 0000000..a486d3c
--- /dev/null
+++ b/old/botan/src/modes/mode_pad/mode_pad.h
@@ -0,0 +1,120 @@
+/**
+* CBC Padding Methods
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_CBC_PADDING_H__
+#define BOTAN_CBC_PADDING_H__
+
+#include <botan/types.h>
+#include <string>
+
+namespace Botan {
+
+/**
+* Block Cipher Mode Padding Method
+* This class is pretty limited, it cannot deal well with
+* randomized padding methods, or any padding method that
+* wants to add more than one block. For instance, it should
+* be possible to define cipher text stealing mode as simply
+* a padding mode for CBC, which happens to consume the last
+* two block (and requires use of the block cipher).
+*/
+class BOTAN_DLL BlockCipherModePaddingMethod
+ {
+ public:
+ /**
+ * @param block output buffer
+ * @param size of the block
+ * @param current_position in the last block
+ */
+ virtual void pad(byte block[],
+ u32bit size,
+ u32bit current_position) const = 0;
+
+ /**
+ * @param block the last block
+ * @param size the of the block
+ */
+ virtual u32bit unpad(const byte block[],
+ u32bit size) const = 0;
+
+ /**
+ * @param block_size of the cipher
+ * @param position in the current block
+ * @return number of padding bytes that will be appended
+ */
+ virtual u32bit pad_bytes(u32bit block_size,
+ u32bit position) const;
+
+ /**
+ * @param block_size of the cipher
+ * @return valid block size for this padding mode
+ */
+ virtual bool valid_blocksize(u32bit block_size) const = 0;
+
+ /**
+ * @return name of the mode
+ */
+ virtual std::string name() const = 0;
+
+ /**
+ * virtual destructor
+ */
+ 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
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