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ChaCha20 C SIMD implementations - AVX512, AVX2, SSE2

License: MIT License

C 100.00%

avx2 avx512 chacha20 sse2 stream-cipher

chacha20-simd's Introduction

ChaCha20-SIMD

Chacha20 SIMD - SSE2, AVX2, AVX512 - C implementation (will add Arm64 implementation later).

SSE2 and AVX2 implementations based on code from Cryptopp. Avx512 code - made by myself (adapted avx2 version).

Implemented IETF variant of ChaCha - 32bits counter and 96bit nonce. If planning to encrypt >256 gigabytes of data with same key - change nonce every 256g.

Some little benchmarking (Ryzen 9 7950X): Avx512: Encrypting 65536 bytes x 1000000 times: 9350.129ms 255 bytes x 1000000 times: 90.367ms 64 bytes x 1000000 times : 77.506ms

Avx2: 17026.156ms 142.672ms 68.288ms

Sse2: 32344.930ms 276.484ms 67.759ms

Portable version (non-simd): 135420.469ms 555.392ms 133.622ms

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