- optimizations in elliptic curves over GF(p)
    - changed Rabin to use OAEP and PSSR
    - changed many classes to allow copy constructors to work correctly
    - improved exception generation and handling

2.2 - added SEAL, CAST-128, Square
    - fixed bug in HAVAL (padding problem)
    - fixed bug in triple-DES (decryption order was reversed)
    - fixed bug in RC5 (couldn't handle key length not a multiple of 4)
    - changed HMAC to conform to RFC-2104 (which is not compatible
      with the original HMAC)
    - changed secret sharing and information dispersal to use GF(2^32)
      instead of GF(65521)
    - removed zero knowledge prover/verifier for graph isomorphism
    - removed several utility classes in favor of the C++ standard library

2.3 - ported to EGCS
    - fixed incomplete workaround of min/max conflict in MSVC

3.0 - placed all names into the "CryptoPP" namespace
    - added MD2, RC2, RC6, MARS, RW, DH2, MQV, ECDHC, CBC-CTS
    - added abstract base classes PK_SimpleKeyAgreementDomain and
      PK_AuthenticatedKeyAgreementDomain
    - changed DH and LUCDIF to implement the PK_SimpleKeyAgreementDomain
      interface and to perform domain parameter and key validation
    - changed interfaces of PK_Signer and PK_Verifier to sign and verify
      messages instead of message digests
    - changed OAEP to conform to PKCS#1 v2.0
    - changed benchmark code to produce HTML tables as output
    - changed PSSR to track IEEE P1363a
    - renamed ElGamalSignature to NR and changed it to track IEEE P1363
    - renamed ECKEP to ECMQVC and changed it to track IEEE P1363
    - renamed several other classes for clarity
    - removed support for calling RSAREF
    - removed option to compile old SHA (SHA-0)
    - removed option not to throw exceptions

3.1 - added ARC4, Rijndael, Twofish, Serpent, CBC-MAC, DMAC
    - added interface for querying supported key lengths of symmetric ciphers
      and MACs
    - added sample code for RSA signature and verification
    - changed CBC-CTS to be compatible with RFC 2040
    - updated SEAL to version 3.0 of the cipher specification
    - optimized multiprecision squaring and elliptic curves over GF(p)
    - fixed bug in MARS key setup
    - fixed bug with attaching objects to Deflator

3.2 - added DES-XEX3, ECDSA, DefaultEncryptorWithMAC
    - renamed DES-EDE to DES-EDE2 and TripleDES to DES-EDE3
    - optimized ARC4
    - generalized DSA to allow keys longer than 1024 bits
    - fixed bugs in GF2N and ModularArithmetic that can cause calculation errors
    - fixed crashing bug in Inflator when given invalid inputs
    - fixed endian bug in Serpent
    - fixed padding bug in Tiger

4.0 - added Skipjack, CAST-256, Panama, SHA-2 (SHA-256, SHA-384, and SHA-512),
      and XTR-DH
    - added a faster variant of Rabin's Information Dispersal Algorithm (IDA)
    - added class wrappers for these operating system features:
      - high resolution timers on Windows, Unix, and MacOS
      - Berkeley and Windows style sockets
      - Windows named pipes
      - /dev/random and /dev/urandom on Linux and FreeBSD
      - Microsoft's CryptGenRandom on Windows
    - added support for SEC 1 elliptic curve key format and compressed points
    - added support for X.509 public key format (subjectPublicKeyInfo) for
      RSA, DSA, and elliptic curve schemes
    - added support for DER and OpenPGP signature format for DSA
    - added support for ZLIB compressed data format (RFC 1950)
    - changed elliptic curve encryption to use ECIES (as defined in SEC 1)
    - changed MARS key schedule to reflect the latest specification
    - changed BufferedTransformation interface to support multiple channels
      and messages
    - changed CAST and SHA-1 implementations to use public domain source code
    - fixed bug in StringSource
    - optmized multi-precision integer code for better performance

4.1 - added more support for the recommended elliptic curve parameters in SEC 2
    - added Panama MAC, MARC4
    - added IV stealing feature to CTS mode
    - added support for PKCS #8 private key format for RSA, DSA, and elliptic
      curve schemes
    - changed Deflate, MD5, Rijndael, and Twofish to use public domain code
    - fixed a bug with flushing compressed streams
    - fixed a bug with decompressing stored blocks
    - fixed a bug with EC point decompression using non-trinomial basis
    - fixed a bug in NetworkSource::GeneralPump()
    - fixed a performance issue with EC over GF(p) decryption
    - fixed syntax to allow GCC to compile without -fpermissive
    - relaxed some restrictions in the license

4.2 - added support for longer HMAC keys
    - added MD4 (which is not secure so use for compatibility purposes only)
    - added compatibility fixes/workarounds for STLport 4.5, GCC 3.0.2,
      and MSVC 7.0
    - changed MD2 to use public domain code
    - fixed a bug with decompressing multiple messages with the same object
    - fixed a bug in CBC-MAC with MACing multiple messages with the same object
    - fixed a bug in RC5 and RC6 with zero-length keys
    - fixed a bug in Adler32 where incorrect checksum may be generated

5.0 - added ESIGN, DLIES, WAKE-OFB, PBKDF1 and PBKDF2 from PKCS #5
    - added key validation for encryption and signature public/private keys
    - renamed StreamCipher interface to SymmetricCipher, which is now implemented
      by both stream ciphers and block cipher modes including ECB and CBC
    - added keying interfaces to support resetting of keys and IVs without
      having to destroy and recreate objects
    - changed filter interface to support non-blocking input/output
    - changed SocketSource and SocketSink to use overlapped I/O on Microsoft Windows
    - grouped related classes inside structs to help templates, for example
      AESEncryption and AESDecryption are now AES::Encryption and AES::Decryption
    - where possible, typedefs have been added to improve backwards 
      compatibility when the CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY macro is defined
    - changed Serpent, HAVAL and IDEA to use public domain code
    - implemented SSE2 optimizations for Integer operations
    - fixed a bug in HMAC::TruncatedFinal()
    - fixed SKIPJACK byte ordering following NIST clarification dated 5/9/02

5.01 - added known answer test for X9.17 RNG in FIPS 140 power-up self test
     - submitted to NIST/CSE, but not publicly released

5.02 - changed EDC test to MAC integrity check using HMAC/SHA1
     - improved performance of integrity check
     - added blinding to defend against RSA timing attack

5.03 - created DLL version of Crypto++ for FIPS 140-2 validation
     - fixed vulnerabilities in GetNextIV for CTR and OFB modes

5.0.4 - Removed DES, SHA-256, SHA-384, SHA-512 from DLL

5.1 - added PSS padding and changed PSSR to track IEEE P1363a draft standard
    - added blinding for RSA and Rabin to defend against timing attacks
      on decryption operations
    - changed signing and decryption APIs to support the above
    - changed WaitObjectContainer to allow waiting for more than 64
      objects at a time on Win32 platforms
    - fixed a bug in CBC and ECB modes with processing non-aligned data
    - fixed standard conformance bugs in DLIES (DHAES mode) and RW/EMSA2
      signature scheme (these fixes are not backwards compatible)
    - fixed a number of compiler warnings, minor bugs, and portability problems
    - removed Sapphire

5.2 - merged in changes for 5.01 - 5.0.4
    - added support for using encoding parameters and key derivation parameters
      with public key encryption (implemented by OAEP and DL/ECIES)
    - added Camellia, SHACAL-2, Two-Track-MAC, Whirlpool, RIPEMD-320,
      RIPEMD-128, RIPEMD-256, Base-32 coding, FIPS variant of CFB mode
    - added ThreadUserTimer for timing thread CPU usage
    - added option for password-based key derivation functions
      to iterate until a mimimum elapsed thread CPU time is reached
    - added option (on by default) for DEFLATE compression to detect
      uncompressible files and process them more quickly
    - improved compatibility and performance on 64-bit platforms,
      including Alpha, IA-64, x86-64, PPC64, Sparc64, and MIPS64
    - fixed ONE_AND_ZEROS_PADDING to use 0x80 instead 0x01 as padding.
    - fixed encoding/decoding of PKCS #8 privateKeyInfo to properly
      handle optional attributes

5.2.1 - fixed bug in the "dlltest" DLL testing program
      - fixed compiling with STLport using VC .NET
      - fixed compiling with -fPIC using GCC
      - fixed compiling with -msse2 on systems without memalign()
      - fixed inability to instantiate PanamaMAC
      - fixed problems with inline documentation

5.2.2 - added SHA-224
      - put SHA-256, SHA-384, SHA-512, RSASSA-PSS into DLL
      
5.2.3 - fixed issues with FIPS algorithm test vectors
      - put RSASSA-ISO into DLL

5.3 - ported to MSVC .NET 2005 with support for x86-64
    - added defense against AES timing attacks, and more AES test vectors
    - changed StaticAlgorithmName() of Rijndael to "AES", CTR to "CTR"

5.4 - added Salsa20
    - updated Whirlpool to version 3.0
    - ported to GCC 4.1, Sun C++ 5.8, and Borland C++Builder 2006

Written by Wei Dai