sha256x8

This pure Go package implements an eight-way SHA256 using AVX2 instructions.

Basic usage

The following

data := [8][]byte{
    []byte("Eight pieces of data"),
    []byte("which all must have "),
    []byte("the same length     "),
    []byte("                    "),
    []byte("Eight pieces of data"),
    []byte("which all must have "),
    []byte("the same length     "),
    []byte("                    "),
}
out := [8][32]byte{}
sha256x8.SumsInto(data,
    [8][]byte{
        out[0][:], out[1][:], out[2][:], out[3][:],
        out[4][:], out[5][:], out[6][:], out[7][:],
    })
fmt.Printf("%x\n", out)

will output

[38ce9135c02f5ee3cfc527e9d33d6cc7c5f387ee0f272af21d73b14c79c8bad4 c0aa3c27409dcebf899fb5eac8fd5ea098c22b3e2400b79f1a1128df83954aa9 928c112e5a5d9eac1d6100d603942ec4a8b1002b04449cc05fb3388bb4dde9b6 1e8a105dbcab2f5d6b30a670c0ff91942f4db62401e669331037101e94198250 38ce9135c02f5ee3cfc527e9d33d6cc7c5f387ee0f272af21d73b14c79c8bad4 c0aa3c27409dcebf899fb5eac8fd5ea098c22b3e2400b79f1a1128df83954aa9 928c112e5a5d9eac1d6100d603942ec4a8b1002b04449cc05fb3388bb4dde9b6 1e8a105dbcab2f5d6b30a670c0ff91942f4db62401e669331037101e94198250]

See godoc for more documentation.

Acknowledgement

This package is based on the SPHINCS+ AVX2 sha256x8 code and Bernstein's crypto_hash_sha256.

Contributing

There is still quite a lot to do:

• Optimize buffering
• SHA256NI backend
• AVX512 backend
• AVX backend
• ARM SIMD backend