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Release Notes: CTC Library 2.1

Release 2.1 is not a dramatic change from the previous release 2.0. The main changes are:-

• Additional algorithms
• Some code generalisation and a number of new entry points.
• Restructuring of PKE control
• Bug fixes

In general, the changes are upwards compatible. There should be little or no problem of application developers in upgrading.

Additional Algorithms

Symmetric Encryption

• Blowfish (160-bit)
• SAFER

Message Digests

• Haval
• RIPEM-160

Public Key

• PEGWIT compatible Elliptic-Curve

Code Generalisation

• C++ namespace support. (If macro CTC_NAMESPACE_SUPPORT is defined CTC names are confined to C++ namespace. CTClib This is not usable with all compilers. Application developers should extend the conditional definition of this symbol in basic.h as appropriate to their compiler).
• Enumeration value to printable string conversion. There is a new module keywords.c which covers CTC's enumerate types to text. This simplifies some user interface tasks, and facilitates internationalisation.
• Locale based multi-byte character handling supported (applications programmers must call setlocale(LC_ALL,"") in their main program or primary calling routines in order to pick up the host's current locale settings. Application developers should extend the conditional definition of this symbol in widechar.h as appropriate to their compiler. (If not defined, simple-minded 'C'-locale support is used as a default for character string to wide-character interconversion.)
• NO_RSA and NO_PEGWIT8 conditional compilation to match NO_IDEA to switch out possibly contentious algorithms.

New Entry Points

• cipherAlgRecognised()
• compandAlgAvail()
• enumName()
• getPubkeyAlg()
• getPubkeyVersion()
• getSignatureArray()
• getSignatureValue()
• hashAlgRecognised()
• hashpassEx()
• subkey()
• validity()

Bug Fixes

• Files including Key-Recovery Key packets can now be read, and the KRK packets are discarded.
• Incorrect Sub-key packet constants (SUBPKT_*) corrected.
• Interoperability with PGP on 3DES conventional encryption fixed. (Note this requires the use of the new entry point hashpassEx() for passphrase to key transformation for keys longer than the hash output length.)
• Public keys can now be signed by other secret keys (the verifying key can now be distinct from the signed public key)
• The key schedule for TEA has been corrected. (2.1 will not interoperate with 2.0 on TEA; however 2.0 wasn't guaranteed to interoperate with itself.)
• No instances of assert() now contain actual code.