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Readme.txt
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Crypto++: a C++ Class Library of Cryptographic Schemes
Version 5.6.3 - NOV/20/2015
Crypto++ Library is a free C++ class library of cryptographic schemes.
Currently the library contains the following algorithms:
algorithm type name
authenticated encryption schemes GCM, CCM, EAX
high speed stream ciphers Panama, Sosemanuk, Salsa20, XSalsa20
AES and AES candidates AES (Rijndael), RC6, MARS, Twofish, Serpent,
CAST-256
IDEA, Triple-DES (DES-EDE2 and DES-EDE3),
other block ciphers Camellia, SEED, RC5, Blowfish, TEA, XTEA,
Skipjack, SHACAL-2
block cipher modes of operation ECB, CBC, CBC ciphertext stealing (CTS),
CFB, OFB, counter mode (CTR)
message authentication codes VMAC, HMAC, GMAC, CMAC, CBC-MAC, DMAC,
Two-Track-MAC
SHA-1, SHA-2 (SHA-224, SHA-256, SHA-384, and
hash functions SHA-512), SHA-3, Tiger, WHIRLPOOL, RIPEMD-128,
RIPEMD-256, RIPEMD-160, RIPEMD-320
RSA, DSA, ElGamal, Nyberg-Rueppel (NR),
public-key cryptography Rabin-Williams (RW), LUC, LUCELG,
DLIES (variants of DHAES), ESIGN
padding schemes for public-key PKCS#1 v2.0, OAEP, PSS, PSSR, IEEE P1363
systems EMSA2 and EMSA5
Diffie-Hellman (DH), Unified Diffie-Hellman
key agreement schemes (DH2), Menezes-Qu-Vanstone (MQV), LUCDIF,
XTR-DH
elliptic curve cryptography ECDSA, ECNR, ECIES, ECDH, ECMQV
insecure or obsolescent MD2, MD4, MD5, Panama Hash, DES, ARC4, SEAL
algorithms retained for backwards 3.0, WAKE-OFB, DESX (DES-XEX3), RC2,
compatibility and historical SAFER, 3-WAY, GOST, SHARK, CAST-128, Square
value
Other features include:
* pseudo random number generators (PRNG): ANSI X9.17 appendix C, RandomPool
* password based key derivation functions: PBKDF1 and PBKDF2 from PKCS #5,
PBKDF from PKCS #12 appendix B
* Shamir's secret sharing scheme and Rabin's information dispersal algorithm
(IDA)
* fast multi-precision integer (bignum) and polynomial operations
* finite field arithmetics, including GF(p) and GF(2^n)
* prime number generation and verification
* useful non-cryptographic algorithms
+ DEFLATE (RFC 1951) compression/decompression with gzip (RFC 1952) and
zlib (RFC 1950) format support
+ hex, base-32, and base-64 coding/decoding
+ 32-bit CRC and Adler32 checksum
* class wrappers for these operating system features (optional):
+ high resolution timers on Windows, Unix, and Mac OS
+ Berkeley and Windows style sockets
+ Windows named pipes
+ /dev/random, /dev/urandom, /dev/srandom
+ Microsoft's CryptGenRandom on Windows
* A high level interface for most of the above, using a filter/pipeline
metaphor
* benchmarks and validation testing
* x86, x86-64 (x64), MMX, and SSE2 assembly code for the most commonly used
algorithms, with run-time CPU feature detection and code selection
* some versions are available in FIPS 140-2 validated form
You are welcome to use it for any purpose without paying me, but see
License.txt for the fine print.
The following compilers are supported for this release. Please visit
http://www.cryptopp.com the most up to date build instructions and porting notes.
* MSVC 6.0 - 2015
* GCC 3.3 - 5.2
* C++Builder 2010
* Intel C++ Compiler 9 - 16.0
* Sun Studio 12u1, Express 11/08, Express 06/10
*** Important Usage Notes ***
1. If a constructor for A takes a pointer to an object B (except primitive
types such as int and char), then A owns B and will delete B at A's
destruction. If a constructor for A takes a reference to an object B,
then the caller retains ownership of B and should not destroy it until
A no longer needs it.
2. Crypto++ is thread safe at the class level. This means you can use
Crypto++ safely in a multithreaded application, but you must provide
synchronization when multiple threads access a common Crypto++ object.
*** MSVC-Specific Information ***
On Windows, Crypto++ can be compiled into 3 forms: a static library
including all algorithms, a DLL with only FIPS Approved algorithms, and
a static library with only algorithms not in the DLL.
(FIPS Approved means Approved according to the FIPS 140-2 standard.)
The DLL may be used by itself, or it may be used together with the second
form of the static library. MSVC project files are included to build
all three forms, and sample applications using each of the three forms
are also included.
To compile Crypto++ with MSVC, open the "cryptest.dsw" (for MSVC 6 and MSVC .NET
2003) or "cryptest.sln" (for MSVC 2005 - 2010) workspace file and build one or
more of the following projects:
cryptopp - This builds the DLL. Please note that if you wish to use Crypto++
as a FIPS validated module, you must use a pre-built DLL that has undergone
the FIPS validation process instead of building your own.
dlltest - This builds a sample application that only uses the DLL.
cryptest Non-DLL-Import Configuration - This builds the full static library
along with a full test driver.
cryptest DLL-Import Configuration - This builds a static library containing
only algorithms not in the DLL, along with a full test driver that uses
both the DLL and the static library.
To use the Crypto++ DLL in your application, #include "dll.h" before including
any other Crypto++ header files, and place the DLL in the same directory as
your .exe file. dll.h includes the line #pragma comment(lib, "cryptopp")
so you don't have to explicitly list the import library in your project
settings. To use a static library form of Crypto++, make the "cryptlib"
project a dependency of your application project, or specify it as
an additional library to link with in your project settings.
In either case you should check the compiler options to
make sure that the library and your application are using the same C++
run-time libraries and calling conventions.
*** DLL Memory Management ***
Because it's possible for the Crypto++ DLL to delete objects allocated
by the calling application, they must use the same C++ memory heap. Three
methods are provided to achieve this.
1. The calling application can tell Crypto++ what heap to use. This method
is required when the calling application uses a non-standard heap.
2. Crypto++ can tell the calling application what heap to use. This method
is required when the calling application uses a statically linked C++ Run
Time Library. (Method 1 does not work in this case because the Crypto++ DLL
is initialized before the calling application's heap is initialized.)
3. Crypto++ can automatically use the heap provided by the calling application's
dynamically linked C++ Run Time Library. The calling application must
make sure that the dynamically linked C++ Run Time Library is initialized
before Crypto++ is loaded. (At this time it is not clear if it is possible
to control the order in which DLLs are initialized on Windows 9x machines,
so it might be best to avoid using this method.)
When Crypto++ attaches to a new process, it searches all modules loaded
into the process space for exported functions "GetNewAndDeleteForCryptoPP"
and "SetNewAndDeleteFromCryptoPP". If one of these functions is found,
Crypto++ uses methods 1 or 2, respectively, by calling the function.
Otherwise, method 3 is used.
*** GCC-Specific Information ***
A makefile is included for you to compile Crypto++ with GCC. Make sure
you are using GNU Make and GNU ld. The make process will produce two files,
libcryptopp.a and cryptest.exe. Run "cryptest.exe v" for the validation
suite.
*** Documentation and Support ***
Crypto++ is documented through inline comments in header files, which are
processed through Doxygen to produce an HTML reference manual. You can find
a link to the manual from http://www.cryptopp.com. Also at that site is
the Crypto++ FAQ, which you should browse through before attempting to
use this library, because it will likely answer many of questions that
may come up.
If you run into any problems, please try the Crypto++ mailing list.
The subscription information and the list archive are available on
http://www.cryptopp.com. You can also email me directly by visiting
http://www.weidai.com, but you will probably get a faster response through
the mailing list.
*** History ***
1.0 - First public release. Withdrawn at the request of RSA DSI.
- included Blowfish, BBS, DES, DH, Diamond, DSA, ElGamal, IDEA,
MD5, RC4, RC5, RSA, SHA, WAKE, secret sharing, DEFLATE compression
- had a serious bug in the RSA key generation code.
1.1 - Removed RSA, RC4, RC5
- Disabled calls to RSAREF's non-public functions
- Minor bugs fixed
2.0 - a completely new, faster multiprecision integer class
- added MD5-MAC, HAVAL, 3-WAY, TEA, SAFER, LUC, Rabin, BlumGoldwasser,
elliptic curve algorithms
- added the Lucas strong probable primality test
- ElGamal encryption and signature schemes modified to avoid weaknesses
- Diamond changed to Diamond2 because of key schedule weakness
- fixed bug in WAKE key setup
- SHS class renamed to SHA
- lots of miscellaneous optimizations
2.1 - added Tiger, HMAC, GOST, RIPE-MD160, LUCELG, LUCDIF, XOR-MAC,
OAEP, PSSR, SHARK
- added precomputation to DH, ElGamal, DSA, and elliptic curve algorithms
- added back RC5 and a new RSA
- 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 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
5.5 - added VMAC and Sosemanuk (with x86-64 and SSE2 assembly)
- improved speed of integer arithmetic, AES, SHA-512, Tiger, Salsa20,
Whirlpool, and PANAMA cipher using assembly (x86-64, MMX, SSE2)
- optimized Camellia and added defense against timing attacks
- updated benchmarks code to show cycles per byte and to time key/IV setup
- started using OpenMP for increased multi-core speed
- enabled GCC optimization flags by default in GNUmakefile
- added blinding and computational error checking for RW signing
- changed RandomPool, X917RNG, GetNextIV, DSA/NR/ECDSA/ECNR to reduce
the risk of reusing random numbers and IVs after virtual machine state
rollback
- changed default FIPS mode RNG from AutoSeededX917RNG<DES_EDE3> to
AutoSeededX917RNG<AES>
- fixed PANAMA cipher interface to accept 256-bit key and 256-bit IV
- moved MD2, MD4, MD5, PanamaHash, ARC4, WAKE_CFB into the namespace "Weak"
- removed HAVAL, MD5-MAC, XMAC
5.5.1 - fixed VMAC validation failure on 32-bit big-endian machines
5.5.2 - ported x64 assembly language code for AES, Salsa20, Sosemanuk, and Panama
to MSVC 2005 (using MASM since MSVC doesn't support inline assembly on x64)
- fixed Salsa20 initialization crash on non-SSE2 machines
- fixed Whirlpool crash on Pentium 2 machines
- fixed possible branch prediction analysis (BPA) vulnerability in
MontgomeryReduce(), which may affect security of RSA, RW, LUC
- fixed link error with MSVC 2003 when using "debug DLL" form of runtime library
- fixed crash in SSE2_Add on P4 machines when compiled with
MSVC 6.0 SP5 with Processor Pack
- ported to MSVC 2008, GCC 4.2, Sun CC 5.9, Intel C++ Compiler 10.0,
and Borland C++Builder 2007
5.6.0 - added AuthenticatedSymmetricCipher interface class and Filter wrappers
- added CCM, GCM (with SSE2 assembly), EAX, CMAC, XSalsa20, and SEED
- added support for variable length IVs
- added OIDs for Brainpool elliptic curve parameters
- improved AES and SHA-256 speed on x86 and x64
- changed BlockTransformation interface to no longer assume data alignment
- fixed incorrect VMAC computation on message lengths
that are >64 mod 128 (x86 assembly version is not affected)
- fixed compiler error in vmac.cpp on x86 with GCC -fPIC
- fixed run-time validation error on x86-64 with GCC 4.3.2 -O2
- fixed HashFilter bug when putMessage=true
- fixed AES-CTR data alignment bug that causes incorrect encryption on ARM
- removed WORD64_AVAILABLE; compiler support for 64-bit int is now required
- ported to GCC 4.3, C++Builder 2009, Sun CC 5.10, Intel C++ Compiler 11
5.6.1 - added support for AES-NI and CLMUL instruction sets in AES and GMAC/GCM
- removed WAKE-CFB
- fixed several bugs in the SHA-256 x86/x64 assembly code:
* incorrect hash on non-SSE2 x86 machines on non-aligned input
* incorrect hash on x86 machines when input crosses 0x80000000
* incorrect hash on x64 when compiled with GCC with optimizations enabled
- fixed bugs in AES x86 and x64 assembly causing crashes in some MSVC build configurations
- switched to a public domain implementation of MARS
- ported to MSVC 2010, GCC 4.5.1, Sun Studio 12u1, C++Builder 2010, Intel C++ Compiler 11.1
- renamed the MSVC DLL project to "cryptopp" for compatibility with MSVC 2010
5.6.2 - changed license to Boost Software License 1.0
- added SHA-3 (Keccak)
- updated DSA to FIPS 186-3 (see DSA2 class)
- fixed Blowfish minimum keylength to be 4 bytes (32 bits)
- fixed Salsa validation failure when compiling with GCC 4.6
- fixed infinite recursion when on x64, assembly disabled, and no AESNI
- ported to MSVC 2012, GCC 4.7, Clang 3.2, Solaris Studio 12.3, Intel C++ Compiler 13.0
5.6.3 - maintenance release, honored API/ABI/Versioning requirements
- expanded processes to include community and its input
- fixed CVE-2015-2141
- cleared most Undefined Behavior Sanitizer (UBsan) findings
- cleared all Address Sanitizer (Asan) findings
- cleared all Valgrind findings
- cleared all Coverity findings
- cleared all Enterprise Analysis (/analyze) findings
- cleared most GCC warnings with -Wall
- cleared most Clang warnings with -Wall
- cleared most MSVC warnings with /W4
- added -fPIC 64-bit builds. Off by default for i386
- added HKDF class from RFC 5868
- switched to member_ptr due to C++ 11 warnings for auto_ptr
- initialization of C++ static objects, off by default
* GCC and init_priotirty/constructor attributes
* MSVC and init_seg(lib)
* CRYPTOPP_INIT_PRIORITY disabled by default, but available
- improved OS X support
- improved GNUmakefile support for Testing and QA
- added self tests for additional Testing and QA
- added cryptest.sh for systematic Testing and QA
- added GNU Gold linker support
- added Visual Studio 2010 solution and project files in vs2010.zip
- added Clang integrated assembler support
- unconditionally define CRYPTOPP_NO_UNALIGNED_DATA_ACCESS for Makefile
target 'ubsan' and at -O3 due to GCC vectorization on x86 and x86_64
- workaround ARMEL/GCC 5.2 bug and failed self test
- fixed crash in MQV due to GCC 4.9+ and inlining
- fixed hang in SHA due to GCC 4.9+ and inlining
- fixed missing rdtables::Te under VS with ALIGNED_DATA_ACCESS
- fixed S/390 and big endian feature detection
- fixed S/390 and int128_t/uint128_t detection
- fixed X32 (ILP32) feature detection
- removed _CRT_SECURE_NO_DEPRECATE for Microsoft platforms
- utilized bound checking interfaces from ISO/IEC TR 24772 when available
- improved ARM, ARM64, MIPS, MIPS64, S/390 and X32 (ILP32) support
- introduced CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
- added additional Doxygen-based documentation
- ported to MSVC 2015, Xcode 7.2, GCC 5.2, Clang 3.7, Intel C++ 16.00
5.7 - nearly identical to 5.6.3
- minor breaks to the ABI and API
- cleared remaining Undefined Behavior Sanitizer (UBsan) findings
- cleared remaining GCC and Visual Studio warnings
- removed CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
Written by Wei Dai and the Crypto++ Project