Cryptol 2.5.0

This release includes a re-written interpreter which is generally faster and has fewer strictness-related edge cases, major enhancements to the performance of the type checker, and a variety of smaller additions and bug fixes.

Added

• New update and updates functions provide an efficient, built-in
  way to replace elements of a vector.

• New trace and traceVal functions print messages as they are being
  evaluated, which can be helpful for debugging.

• New short-cutting operators /\, \/ and ==> now exist. The older
  && and || operators are strict, and have higher precedence.

• New experimental :eval command evaluates an expression using
  a reference interpreter, which we created to ultimately serve as the
  official definition of the Cryptol semantics. This interpreter is less
  efficient than the normal one, but written in a very direct style meant
  to clearly describe the meaning of each language construct. For this
  release, the semantics of the reference interpreter are not considered
  final and still subject to change.

• New prover-stats setting in the REPL, when enabled, causes the
  :prove and :sat commands to print information about the time taken
  and prover used to coplete a proof.

• The :help command now shows information about precedence and fixity
  of operators.

• The cryptol executable returns a non-zero exit code when proofs
  fail.

• New prelude function: iterate

• New example: MISTY1

Changed

• The main Cryptol interpreter has been re-written in monadic style,
  which allows much greater control over the order of evaluation, and
  generally improves performance.

• The type-checker has had a major overhaul, improving performance
  dramatically in many cases.

• Overall, performance is generally better.

• New command line option --color makes use of color text output
  configurable.

• With :set ascii=on, the REPL now prints quotation marks around
  strings.

• Cryptol now depends on version 7.0 or greater of the SBV library.

Fixes

• Fix an off by one error in the implementation of split.

• Fix a typo in the implementation of the >> operator.

• Fix the pdiv and pmod primitives in the special case where the
  length of the dividend is less than the degree of the divisor polynomial.

• Fix an issue where literal sequences of bit values were being
  incorrectly reversed.

• Various documentation fixes.

• Close issues #138, #268, #334, #362, #373, #388, #395

Cryptol 2.4.0

This is primarily a maintenance release to support GHC 8.0.1 and drop
support for the GHC 7.8 series, and to roll up a number of smaller
improvements and fixes. Highlights are below, and a comprehensive list
of closed issues is available on GitHub.

Added

• Added convenient aliases to the prelude: a prefix complement
  operator ~, and a base-2 logarithm type alias lg2.
• New library functions in a new module Cryptol::Extras. We
  intend to eventually move these functions into the prelude, but at
  the moment they take too long to typecheck for them to be loaded
  so frequently (tracking this as issue #302).
• A new command line option --command/-c specifies
  commands to be run after the interpreter loads. Multiple commands
  can be specified, and will be run in order. For example:

cryptol Foo.cry --command ':set prover=abc' --command ':prove'

• Added :readByteArray and :writeByteArray to read and
  write raw byte sequences from files, for example:

Cryptol> :writeByteArray /tmp/foo "hello world"
Cryptol> :readByteArray /tmp/foo
Cryptol> it
"hello world"

• Added new examples: A51, Bivium, Trivium, Minilock
• The Windows installer now offers a choice of destination
  directory, and can add the installation directory to the user's
  path.

Changed

• Dropped support for GHC 7.8.4 and earlier.
• The symbolic simulator now takes advantage of an SBV feature that
  can lead to signifcant performance improvements when selecting
  from tables of constant values.
• The random primitive now takes a 256-bit seed, rather than the
  previous 32-bit seed. This avoids inconsistencies between
  platforms with different machine word sizes.
• The splitBy function in the prelude has been removed in favor of
  just using split, which has an identical type.
• Improved documentation and book, notably adding a section about
  using modules, and more syntax details.
• Improved the parser to allow for more flexible use of prefix
  operators.
• Improved formatting of output for several commands and error
  messages.

Fixes

• Fixed certain keywords, such as if and else, not appearing as
  tab-completion results.
• Fixed incorrect behavior of shifts and rotates by greater than
  2^63.
• Fixed the prelude not loading when a module specified at the
  command line fails to load.
• Fixed type-correctness of certain generated SMTLIB code from the
  symbolic simulator.
• Fixed a performance regression caused by unnecessarily-parallel
  runtime settings.

Cryptol 2.3.0

General Improvements Made

• Added new typechecker solver and typechecker improvements.

The major feature of this release is a revised constraint solver
for typechecking, and improvements to how the typechecker
generates and propagates constraints. In many cases, the
typechecker will now accept simpler type signatures and require
fewer extraneous "obvious" constraints.

If an existing definition fails to typecheck with the new solver,
try simplifying or eliminating its signature. Some of the
constraints added only to satisfy the earlier typechecker may no
longer be necessary or checkable.

Despite the improvements, we are still aware of some bugs with the
new solver. If you run into trouble, see
the relevant tickets.

• Made the fixity of primitives more consistent with their
  counterparts in other languages.
• Fixed some incorrect strictness in primitives.
• Fixed some pretty-printing bugs that caused commands like :type
  to print results with invalid Cryptol syntax.
• Improved Windows installer, allowing installation to custom
  locations, and adding the executables' directory to the user's
  path.
• Numerous performance and stability fixes.

Features Added

• Added an interpreter option :set tc-solver to allow configuration
  of the SMT solver used during typechecking.
• Added support for docstrings on Cryptol definitions. Docstring
  syntax is the same as block comment syntax, but with more than one
  * opening the block, for example:

/** This is the docstring of foo */
foo x = x + 1

With this example loaded, typing :help foo will display the both
the type and the docstring for foo.

• Added :writeByteArray and :readByteArray interpreter commands
  which allow the interpreter to write values of type [n][8] to a
  file, and then read those values back in (currently binding the
  result to the it variable).
• Added support for UTF-8 in identifiers, and set the locale of the
  interpreter to UTF-8. If you encounter errors reading in your old
  Cryptol files, make sure they are encoded as UTF-8.
• Added experimental cryptol-server executable, which can be built
  by passing -fserver to a Cabal build, or by prefixing a Makefile
  build with CRYPTOL_SERVER=1. The interface to this server is
  very unstable, but to see an example of it in use, see
  pycryptol.

Examples Added

• 3DES
• ChaCha20
• FNV-a1
• SIV (RFC5297)
• Salsa20
• MiniLock (including SHA256, Blake2s, Curve25519, SCrypt, PBKDF2, Salsa20, Poly1305)

Contrib

• Even-Mansour

Puzzles

• Coins
• Fox-Chicken-Corn
• Marble
• NQueens

Release of version 2.2.6

Cryptol 2.2.5

This is a minor release:

• Changed to exclude SBV version 5.0, but work with both older and upcoming releases
• Removed the iteSolver option which has soundness issues in older versions of SBV (see LeventErkok/sbv#180)

Cryptol 2.2.4

This is a minor release:

• Fixed a panic when using :prove and :sat with certain shift primitives (19ce4d4)

Cryptol 2.2.3

This is a minor release:

• Changed to using SBV 4.3+
• Fixed warnings when building with GHC 7.10.1

Cryptol 2.2.2

This is a minor release:

• Added an upper bound on sbv to avoid breakage with the new version 4.3 (we're using 4.3 in the development version as of 711ba43)
• Remove vestigial references to the defunct configure script and require Cabal 1.20 (#197)
• Tweak README.md to clarify CVC4 installation requirements

Note that in addition to the binaries posted here, Mac users can now use Homebrew to install both the latest stable release and the latest development version of Cryptol.

Cryptol 2.2.1

This is a minor release to address a few issues that arose with Hackage and Homebrew distributions, and to add an Ubuntu 14.04 LTS binary.

• Added an upper bound on base to make Hackage happy
• Fixed an edge case when installing the LICENSE files with a PREFIX set in the Makefile
• Fixed invalid Haddock syntax (#195)