Release Notes:

• This is the version of XCrypto which will be maintained and built on going forward.
• The v0.x.x branches are no longer maintained.

Release Notes:

Specification:

• Revised all f3=0 instruction encodings.
• This was done to make the packed instructions much simpler to encode, and remove corner cases.
• General cleanup and typo fixes.
• Added a dedicated FAQ section for miscellaneous design rationale.
• See scarv/xcrypto-spec v0.15.1 for more.

Reference Implementation:

• Substantially smaller in terms of resource usage with no impact on performance.
• See scarv/xcrypto-ref v0.15.1 for more.

Release Notes:

• Synchronise changes for version v0.13.0 of the XCrypto specfication.
• Adds indexed load/store instructions
• Fixes various typos in the specification, and clarifies some behaviour.

Submodule specific releases:

• xcrypto-spec
• xcrypto-ref`

Release Notes:

• Add new benchmarking flow
• Add SHA2 example code
• Add emulated data load/store performance counters to Verilator environment
• Add easier way to capture simulated program stdout
• Modify #68, making xc.bop a 3 operand instruction rather than just two
• Fix #71 "Encoding fixes needed for multi-precision instructions".
  • This fix requires a re-build of binutils and associated XCrypto software due to encoding changes.
• Switch to centralised LaTeX submodule for bibliography and notation.

Known Issues:

• Proofs for packed multiply instructions xc.pmul.h and xc.pmul.l timeout with no counter examples found.
• Proofs for xc.mmul.3 multiply instruction times out with no counter examples found.
• Protocols proof fails due to lack of fairness assumptions about memory stalling and cpu response acceptance.

Release Notes:

• Add the xc.lut instruction. A 4-bit in-line lookup-table instruction.
• Add the xc.sha3.* instructions for accelerating code-dense Keccak Sponge functions.
• Add Keccak / SHA3 code examples
• Add AES code examples
• Add Prince code examples
• Change #63 - Increase the maximum possible immediate shift values for xc.msll.i and xc.msrl.i
• Change #60 - xc.scatter.* and xc.gather.* syntax changes
• Change #57 - Allow full-width immediate shfits and rotate for packed instructions where w=32
• Fix #67 - Incorrectly specified field for xc.prot
• Fix #66 - xc.ins/xc.ext instruction spec typos
• Fix #64, #55 - xc.mix.* instruction spec typos
• Fix #61 - bug in XCrypto core to AXI4-Lite bridge.
• Fix #54 - Specification bug for xc.prot and xc.prot.i
• Fix #53 - Bintuils encoding bug for xc.ins and xc.ext.
• Fix #47 - Add switchable integration mode for the reference RTL. Faster v.s Easy Integration
• Verilator flow and testbench environment improvments

Known Issues:

• Proofs for packed multiply instructions timeout with no counter examples found.
• Protocols proof fails due to lack of fairness assumptions about memory stalling and cpu response acceptance.

Release Notes:

• Added a proper verilator flow allowing for easy development of software using the actual integrated hardware platform.
• Added sw-libscarv as a submodule
• Example use of libscarv in the examples/helloworld folder. Uses the XCrypto accelerated mpn_add function.

Known Issues:

• Performance gains due to XCrypto instructions negated by slow interface to the COP. See #47 for ongoing work.
• Proofs for packed multiply instructions timeout with no counter examples found.
• Protocols proof fails due to lack of fairness assumptions about memory stalling and cpu response acceptance.
• No integration of formal checks into standard Icarus verilog simulation flow. All verification relies on model checking.

Release Notes:

• Add RTL implementation of the new AES acceleration instructions.
• Add formal checks for the AES instructions.
• Update implementation guide document with new AES block information.

Known Issues:

• Proofs for packed multiply instructions timeout with no counter examples found.
• protocols proof fails due to lack of fairness assumptions about memory stalling and cpu response acceptance.
• No integration of formal checks into standard Icarus verilog simulation flow. All verification relies on model checking.

Initial public release of XCrypto

This is the first public release of the XCrypto ISE specification and accompanying reference implementation.

Release Notes:

• The XCrypto ISE specification document is attatched to this release as xcrypto-specification-0.9.0.pdf
• The documentation for the reference implementation is attatched to this release as xcrypto-reference-implementation-0.9.0.pdf
• Both documents can be re-built from source by running make docs from inside the repository.

Known Issues:

• AES instructions currently implemented as NOP.
• Proofs for packed multiply instructions timeout with no counter examples found.
• protocols proof fails due to lack of fairness assumptions about memory stalling and cpu response acceptance.
• No integration of formal checks into standard Icarus verilog simulation flow. All verification relies on model checking.