path: root/ethutil/helpers.go

package ethutil

import (
    "code.google.com/p/go.crypto/ripemd160"
    "crypto/sha256"
    "encoding/hex"
    "github.com/obscuren/sha3"
    "strconv"
)

func Uitoa(i uint32) string {
    return strconv.FormatUint(uint64(i), 10)
}

func Sha256Bin(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 Sha3Bin(data []byte) []byte {
    d := sha3.NewKeccak256()
    d.Write(data)

    return d.Sum(nil)
}

// Helper function for comparing slices
func CompareIntSlice(a, b []int) bool {
    if len(a) != len(b) {
        return false
    }
    for i, v := range a {
        if v != b[i] {
            return false
        }
    }
    return true
}

// Returns the amount of nibbles that match each other from 0 ...
func MatchingNibbleLength(a, b []int) int {
    i := 0
    for CompareIntSlice(a[:i+1], b[:i+1]) && i < len(b) {
        i += 1
    }

    return i
}

func Hex(d []byte) string {
    return hex.EncodeToString(d)
}
func FromHex(str string) []byte {
    h, _ := hex.DecodeString(str)
    return h
}