ethcrypto/crypto.go


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package ethcrypto

import (
    "crypto/sha256"

    "code.google.com/p/go.crypto/ripemd160"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/obscuren/secp256k1-go"
    "github.com/obscuren/sha3"
)

// TODO refactor, remove (bin)
func Sha3(data []byte) []byte {
    d := sha3.NewKeccak256()
    d.Write(data)

    return d.Sum(nil)
}

// Creates an ethereum address given the bytes and the nonce
func CreateAddress(b []byte, nonce uint64) []byte {
    return Sha3(ethutil.NewValue([]interface{}{b, nonce}).Encode())[12:]
}

func Sha256(data []byte) []byte {
    hash := sha256.Sum256(data)

    return hash[:]
}

func Ripemd160(data []byte) []byte {
    ripemd := ripemd160.New()
    ripemd.Write(data)

    return ripemd.Sum(nil)
}

func Ecrecover(data []byte) []byte {
    var in = struct {
        hash []byte
        sig  []byte
    }{data[:32], data[32:]}

    r, _ := secp256k1.RecoverPubkey(in.hash, in.sig)

    return r
}