NEWS entry for 2.0.

Rev: nettle/NEWS:1.2

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+NEWS for the 2.0 release
+
+       This release breaks binary compatibility by splitting the
+       library into two. Some other smaller changes that are not
+       backwards compatible are also done at the same time.
+
+       * The nettle library is split into two libraries, libnettle
+         and libhogweed. libnettle contains the symmetric crypto
+         algorithms that don't depend on GMP, while libhogweed
+         contains the public key algorithms that depend on GMP.
+         Using a single library worked fine with static linking, but
+         not with dynamic linking. Consider an application that uses
+         nettle and which doesn't use any public key cryptography. If
+         this application is linked dynamically to nettle, it would
+         have to be linked also with GMP if and only if public key
+         support was enabled when the nettle library was installed.
+
+         The library names are libnettle.so.3.0 and
+         libhogweed.so.1.0, with sonames libnettle.so.3 and
+         libhogweed.so.1.
+
+       * Function typedefs have been changed to non-pointer types.
+         E.g, the
+
+           typedef void (nettle_hash_init_func *)(void *ctx);
+
+         of previous versions is replaced by
+
+           typedef void (nettle_hash_init_func)(void *ctx);
+
+         This makes it possible to use the type when declaring
+         functions, like
+
+           nettle_hash_init_func foo_hash_init;
+
+           void foo_hash_init(void *ctx) { ... }
+
+       * Changes to the yarrow256 interface. The automatic seed file
+         generation, and the seed_file member in struct
+         yarrow256_ctx, has been removed. To generate a new seed
+         file, use yarrow256_random. The function
+         yarrow256_force_reseed has been replaced by the two
+         functions yarrow256_fast_reseed and yarrow256_slow_reseed,
+         which were previously static. This interface change makes it
+         easier to mix in the current content of the seed file before
+         overwriting it with newly generated data.
+
+       Other changes:
+
+       * The sexp-conv program preserves comments when using the
+         advanced syntax for output. Optionally locks the output
+         file.
+
+       * The base64 decoder recognizes ASCII FF (form feed) and VT
+          (vertical tab) as white space.
+
+       * New x86_64 implementations of AES and SHA1. On a 2.2 GHz
+          opteron, SHA1 was benchmarked at 250 MByte/s, and AES-128 at
+          110 MByte/s.
+
+       * Performance of AES increased by 20-30% on x86.
+
+       * New programs in the examples directory: erathostenes and
+          next-prime.
+       
 NEWS for the 1.15 release
 
        Added support for PKCS#1 style RSA signatures using SHA256,