3 files changed, 292 insertions, 0 deletions
diff --git a/src/sym_algo/sym_algo.h b/src/sym_algo/sym_algo.h
new file mode 100644
index 000000000..02343ed56
--- /dev/null
+++ b/src/sym_algo/sym_algo.h
@@ -0,0 +1,93 @@
+/**
+* Symmetric Algorithm Base Class
+* (C) 1999-2007 Jack Lloyd
+*/
+
+#ifndef BOTAN_SYMMETRIC_ALGORITHM_H__
+#define BOTAN_SYMMETRIC_ALGORITHM_H__
+
+#include <botan/types.h>
+#include <botan/exceptn.h>
+#include <botan/symkey.h>
+
+namespace Botan {
+
+/**
+* This class represents a symmetric algorithm object.
+*/
+class BOTAN_DLL SymmetricAlgorithm
+   {
+   public:
+
+      /**
+      * The maximum allowed key length.
+      */
+      const u32bit MAXIMUM_KEYLENGTH;
+
+      /**
+      * The minimal allowed key length.
+      */
+      const u32bit MINIMUM_KEYLENGTH;
+
+      /**
+      * A valid keylength is a multiple of this value.
+      */
+      const u32bit KEYLENGTH_MULTIPLE;
+
+      /**
+      * The name of the algorithm.
+      * @return the name of the algorithm
+      */
+      virtual std::string name() const = 0;
+
+      /**
+      * Set the symmetric key of this object.
+      * @param key the SymmetricKey to be set.
+      */
+      void set_key(const SymmetricKey& skey) throw(Invalid_Key_Length)
+         { set_key(skey.begin(), skey.length()); }
+
+      /**
+      * Set the symmetric key of this object.
+      * @param key the to be set as a byte array.
+      * @param the length of the byte array.
+      */
+      void set_key(const byte skey[], u32bit length) throw(Invalid_Key_Length)
+         {
+         if(!valid_keylength(length))
+            throw Invalid_Key_Length(name(), length);
+         key(skey, length);
+         }
+
+      /**
+      * Check whether a given key length is valid for this algorithm.
+      * @param length the key length to be checked.
+      * @return true if the key length is valid.
+      */
+      bool valid_keylength(u32bit length) const
+         {
+         return ((length >= MINIMUM_KEYLENGTH) &&
+                 (length <= MAXIMUM_KEYLENGTH) &&
+                 (length % KEYLENGTH_MULTIPLE == 0));
+         }
+
+      /**
+      * Construct a SymmetricAlgorithm.
+      * @param key_min the minimum allowed key length
+      * @param key_max the maximum allowed key length
+      * @param key_mod any valid key length must be a multiple of this value
+      */
+      SymmetricAlgorithm(u32bit key_min, u32bit key_max, u32bit key_mod) :
+         MAXIMUM_KEYLENGTH(key_max ? key_max : key_min),
+         MINIMUM_KEYLENGTH(key_min),
+         KEYLENGTH_MULTIPLE(key_mod)
+            {}
+
+      virtual ~SymmetricAlgorithm() {}
+   private:
+      virtual void key(const byte[], u32bit) = 0;
+   };
+
+}
+
+#endif
diff --git a/src/sym_algo/symkey.cpp b/src/sym_algo/symkey.cpp
new file mode 100644
index 000000000..7cc1bce64
--- /dev/null
+++ b/src/sym_algo/symkey.cpp
@@ -0,0 +1,139 @@
+/*************************************************
+* OctetString Source File                        *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/symkey.h>
+#include <botan/xor_buf.h>
+#include <botan/rng.h>
+#include <botan/pipe.h>
+#include <botan/hex.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*************************************************
+* Create an OctetString from RNG output          *
+*************************************************/
+OctetString::OctetString(RandomNumberGenerator& rng,
+                         u32bit length)
+   {
+   bits.create(length);
+   rng.randomize(bits, length);
+   }
+
+/*************************************************
+* Create an OctetString from a hex string        *
+*************************************************/
+void OctetString::change(const std::string& hex_string)
+   {
+   SecureVector<byte> hex;
+   for(u32bit j = 0; j != hex_string.length(); ++j)
+      if(Hex_Decoder::is_valid(hex_string[j]))
+         hex.append(hex_string[j]);
+
+   if(hex.size() % 2 != 0)
+      throw Invalid_Argument("OctetString: hex string must encode full bytes");
+   bits.create(hex.size() / 2);
+   for(u32bit j = 0; j != bits.size(); ++j)
+      bits[j] = Hex_Decoder::decode(hex.begin() + 2*j);
+   }
+
+/*************************************************
+* Create an OctetString from a byte string       *
+*************************************************/
+void OctetString::change(const byte in[], u32bit n)
+   {
+   bits.create(n);
+   bits.copy(in, n);
+   }
+
+/*************************************************
+* Set the parity of each key byte to odd         *
+*************************************************/
+void OctetString::set_odd_parity()
+   {
+   const byte ODD_PARITY[256] = {
+      0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0B, 0x0B,
+      0x0D, 0x0D, 0x0E, 0x0E, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16,
+      0x19, 0x19, 0x1A, 0x1A, 0x1C, 0x1C, 0x1F, 0x1F, 0x20, 0x20, 0x23, 0x23,
+      0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2A, 0x2A, 0x2C, 0x2C, 0x2F, 0x2F,
+      0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3B, 0x3B,
+      0x3D, 0x3D, 0x3E, 0x3E, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46,
+      0x49, 0x49, 0x4A, 0x4A, 0x4C, 0x4C, 0x4F, 0x4F, 0x51, 0x51, 0x52, 0x52,
+      0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5B, 0x5B, 0x5D, 0x5D, 0x5E, 0x5E,
+      0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6B, 0x6B,
+      0x6D, 0x6D, 0x6E, 0x6E, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76,
+      0x79, 0x79, 0x7A, 0x7A, 0x7C, 0x7C, 0x7F, 0x7F, 0x80, 0x80, 0x83, 0x83,
+      0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8A, 0x8A, 0x8C, 0x8C, 0x8F, 0x8F,
+      0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9B, 0x9B,
+      0x9D, 0x9D, 0x9E, 0x9E, 0xA1, 0xA1, 0xA2, 0xA2, 0xA4, 0xA4, 0xA7, 0xA7,
+      0xA8, 0xA8, 0xAB, 0xAB, 0xAD, 0xAD, 0xAE, 0xAE, 0xB0, 0xB0, 0xB3, 0xB3,
+      0xB5, 0xB5, 0xB6, 0xB6, 0xB9, 0xB9, 0xBA, 0xBA, 0xBC, 0xBC, 0xBF, 0xBF,
+      0xC1, 0xC1, 0xC2, 0xC2, 0xC4, 0xC4, 0xC7, 0xC7, 0xC8, 0xC8, 0xCB, 0xCB,
+      0xCD, 0xCD, 0xCE, 0xCE, 0xD0, 0xD0, 0xD3, 0xD3, 0xD5, 0xD5, 0xD6, 0xD6,
+      0xD9, 0xD9, 0xDA, 0xDA, 0xDC, 0xDC, 0xDF, 0xDF, 0xE0, 0xE0, 0xE3, 0xE3,
+      0xE5, 0xE5, 0xE6, 0xE6, 0xE9, 0xE9, 0xEA, 0xEA, 0xEC, 0xEC, 0xEF, 0xEF,
+      0xF1, 0xF1, 0xF2, 0xF2, 0xF4, 0xF4, 0xF7, 0xF7, 0xF8, 0xF8, 0xFB, 0xFB,
+      0xFD, 0xFD, 0xFE, 0xFE };
+
+   for(u32bit j = 0; j != bits.size(); ++j)
+      bits[j] = ODD_PARITY[bits[j]];
+   }
+
+/*************************************************
+* Hex encode an OctetString                      *
+*************************************************/
+std::string OctetString::as_string() const
+   {
+   Pipe pipe(new Hex_Encoder);
+   pipe.process_msg(bits);
+   return pipe.read_all_as_string();
+   }
+
+/*************************************************
+* XOR Operation for OctetStrings                 *
+*************************************************/
+OctetString& OctetString::operator^=(const OctetString& k)
+   {
+   if(&k == this) { bits.clear(); return (*this); }
+   xor_buf(bits.begin(), k.begin(), std::min(length(), k.length()));
+   return (*this);
+   }
+
+/*************************************************
+* Equality Operation for OctetStrings            *
+*************************************************/
+bool operator==(const OctetString& s1, const OctetString& s2)
+   {
+   return (s1.bits_of() == s2.bits_of());
+   }
+
+/*************************************************
+* Unequality Operation for OctetStrings          *
+*************************************************/
+bool operator!=(const OctetString& s1, const OctetString& s2)
+   {
+   return !(s1 == s2);
+   }
+
+/*************************************************
+* Append Operation for OctetStrings              *
+*************************************************/
+OctetString operator+(const OctetString& k1, const OctetString& k2)
+   {
+   return OctetString(SecureVector<byte>(k1.bits_of(), k2.bits_of()));
+   }
+
+/*************************************************
+* XOR Operation for OctetStrings                 *
+*************************************************/
+OctetString operator^(const OctetString& k1, const OctetString& k2)
+   {
+   SecureVector<byte> ret(std::max(k1.length(), k2.length()));
+   ret.copy(k1.begin(), k1.length());
+   xor_buf(ret, k2.begin(), k2.length());
+   return OctetString(ret);
+   }
+
+}
diff --git a/src/sym_algo/symkey.h b/src/sym_algo/symkey.h
new file mode 100644
index 000000000..f3211eb0f
--- /dev/null
+++ b/src/sym_algo/symkey.h
@@ -0,0 +1,60 @@
+/*************************************************
+* OctetString Header File                        *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_SYMKEY_H__
+#define BOTAN_SYMKEY_H__
+
+#include <botan/secmem.h>
+#include <string>
+
+namespace Botan {
+
+/*************************************************
+* Octet String                                   *
+*************************************************/
+class BOTAN_DLL OctetString
+   {
+   public:
+      u32bit length() const { return bits.size(); }
+      SecureVector<byte> bits_of() const { return bits; }
+
+      const byte* begin() const { return bits.begin(); }
+      const byte* end() const   { return bits.end(); }
+
+      std::string as_string() const;
+
+      OctetString& operator^=(const OctetString&);
+
+      void set_odd_parity();
+
+      void change(const std::string&);
+      void change(const byte[], u32bit);
+      void change(const MemoryRegion<byte>& in) { bits = in; }
+
+      OctetString(class RandomNumberGenerator&, u32bit len);
+      OctetString(const std::string& str = "") { change(str); }
+      OctetString(const byte in[], u32bit len) { change(in, len); }
+      OctetString(const MemoryRegion<byte>& in) { change(in); }
+   private:
+      SecureVector<byte> bits;
+   };
+
+/*************************************************
+* Operations on Octet Strings                    *
+*************************************************/
+BOTAN_DLL bool operator==(const OctetString&, const OctetString&);
+BOTAN_DLL bool operator!=(const OctetString&, const OctetString&);
+BOTAN_DLL OctetString operator+(const OctetString&, const OctetString&);
+BOTAN_DLL OctetString operator^(const OctetString&, const OctetString&);
+
+/*************************************************
+* Alternate Names                                *
+*************************************************/
+typedef OctetString SymmetricKey;
+typedef OctetString InitializationVector;
+
+}
+
+#endif