Optimized Picnic implementation version 3.0.18

• Add instance specific functions to the public API.

Optimized Picnic implementation version 3.0.17

• Small improvements and fixes.

Optimized Picnic implementation version 3.0.16

• Fix alignment of buffers accessed with SIMD instructions when building with MSVC.
• Ensure that builds fail if alignment cannot be specified.

Optimized Picnic implementation version 3.0.15

• Fix debug build.
• Ensure the memory in Merkle tree helper function is initialized.

Optimized Picnic implementation version 3.0.14

• Ensure that public keys stored in private keys are valid.
• Small improvements in memory handling.

Optimized Picnic implementation version 3.0.13

• Add the plain32 implementation of SHAKE and automatically enable it for 32-bit targets.
• Avoid __builtin_cpu_supports on Apple as support is spotty.
• Reduce memory usage.

Optimized Picnic implementation version 3.0.12

• Improve matrix multiplication for L5 instances on AVX2. This improves the performance of Picnic-L5-{FS,UR} by up to 5 %.
• Reduce memory usage and initialization cost for trees.
• Make the use of mzd_local_t as SIMD registers explicit. This change avoids potential issues when not following the rules for accessing members of unions.
• Clear temporary copies of private keys.

Optimized Picnic implementation version 3.0.11

• Fix NEON code on M1.
• Ensure SSE2/AVX2/NEON shift intrinsics with immediate operands are used correctly.
• Use Boost.Test as unit test framework.

Optimized Picnic implementation version 3.0.10

• Fix build with llvm on ARM with NEON enabled

Optimized Picnic implementation version 3.0.9

• Unbreak x86-32 build.
• Fix build on M1 with NEON enabled.