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Diffstat (limited to 'third_party/rust/c2-chacha/README.md')
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diff --git a/third_party/rust/c2-chacha/README.md b/third_party/rust/c2-chacha/README.md new file mode 100644 index 0000000000..a7f472c590 --- /dev/null +++ b/third_party/rust/c2-chacha/README.md @@ -0,0 +1,24 @@ +# The ChaCha family of stream ciphers + +## Features + +- pure Rust implementation +- supports the RustCrypto API +- builds on stable Rust +- portable +- fast: within 15% of throughput of a hand-optimized ASM SIMD implementation + (floodberry/chacha-opt) on my machine (a Xeon X5650, using ppv-lite86) +- no-std compatible (std required only for runtime algorithm selection) + +## Supported Variants + +ChaCha20: used in chacha20-poly1305 in TLS, OpenSSH; arc4random in the BSDs, +Linux /dev/urandom since 4.8. + +Ietf: IETF RFC 7539. Longer nonce, short block counter. + +XChaCha20: constructed analogously to XSalsa20; a mixing step during +initialization allows using a long nonce and along with a full-sized block +counter. + +ChaCha12, ChaCha8: faster; lower security margin of safety. |