Update to 1.6.0:

Noteworthy changes in version 1.6.0 (2013-12-16)
------------------------------------------------

 * Removed the long deprecated gcry_ac interface.  Thus Libgcrypt is
   not anymore ABI compatible to previous versions if they used the ac
   interface.

 * Removed the module register subsystem.

 * The deprecated message digest debug macros have been removed.  Use
   gcry_md_debug instead.

 * Removed deprecated control codes.

 * Improved performance of most cipher algorithms as well as for the
   SHA family of hash functions.

 * Added support for the IDEA cipher algorithm.

 * Added support for the Salsa20 and reduced Salsa20/12 stream ciphers.

 * Added limited support for the GOST 28147-89 cipher algorithm.

 * Added support for the GOST R 34.11-94 and R 34.11-2012 (Stribog)
   hash algorithms.

 * Added a random number generator to directly use the system's RNG.
   Also added an interface to prefer the use of a specified RNG.

 * Added support for the SCRYPT algorithm.

 * Mitigated the Yarom/Falkner flush+reload side-channel attack on RSA
   secret keys.  See <http://eprint.iacr.org/2013/448> [CVE-2013-4242].

 * Added support for Deterministic DSA as per RFC-6969.

 * Added support for curve Ed25519.

 * Added a scatter gather hash convenience function.

 * Added several MPI amd SEXP helper functions.

 * Added support for negative numbers to gcry_mpi_print,
   gcry_mpi_aprint and gcry_mpi_scan.

 * The algorithm ids GCRY_PK_ECDSA and GCRY_PK_ECDH are now
   deprecated.  Use GCRY_PK_ECC if you need an algorithm id.

 * Changed gcry_pk_genkey for "ecc" to only include the curve name and
   not the parameters.  The flag "param" may be used to revert this.

 * Added a feature to globally disable selected hardware features.

 * Added debug helper functions.


(wiz)