116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package crypto
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"code.google.com/p/go.crypto/ripemd160"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/obscuren/ecies"
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"github.com/obscuren/secp256k1-go"
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"github.com/obscuren/sha3"
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)
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func init() {
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// specify the params for the s256 curve
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ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
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}
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func Sha3(data []byte) []byte {
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d := sha3.NewKeccak256()
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d.Write(data)
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return d.Sum(nil)
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}
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// Creates an ethereum address given the bytes and the nonce
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func CreateAddress(b []byte, nonce uint64) []byte {
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return Sha3(ethutil.NewValue([]interface{}{b, nonce}).Encode())[12:]
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}
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func Sha256(data []byte) []byte {
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hash := sha256.Sum256(data)
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return hash[:]
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}
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func Ripemd160(data []byte) []byte {
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ripemd := ripemd160.New()
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ripemd.Write(data)
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return ripemd.Sum(nil)
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}
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func Ecrecover(data []byte) []byte {
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var in = struct {
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hash []byte
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sig []byte
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}{data[:32], data[32:]}
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r, _ := secp256k1.RecoverPubkey(in.hash, in.sig)
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return r
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}
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// New methods using proper ecdsa keys from the stdlib
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func ToECDSA(prv []byte) *ecdsa.PrivateKey {
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if len(prv) == 0 {
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return nil
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}
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priv := new(ecdsa.PrivateKey)
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priv.PublicKey.Curve = S256()
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priv.D = ethutil.BigD(prv)
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priv.PublicKey.X, priv.PublicKey.Y = S256().ScalarBaseMult(prv)
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return priv
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}
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func FromECDSA(prv *ecdsa.PrivateKey) []byte {
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if prv == nil {
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return nil
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}
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return prv.D.Bytes()
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}
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func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
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if len(pub) == 0 {
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return nil
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}
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x, y := elliptic.Unmarshal(S256(), pub)
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return &ecdsa.PublicKey{S256(), x, y}
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}
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func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
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if pub == nil {
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return nil
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}
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return elliptic.Marshal(S256(), pub.X, pub.Y)
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}
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func GenerateKey() (*ecdsa.PrivateKey, error) {
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return ecdsa.GenerateKey(S256(), rand.Reader)
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}
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func SigToPub(hash, sig []byte) *ecdsa.PublicKey {
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s := Ecrecover(append(hash, sig...))
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x, y := elliptic.Unmarshal(S256(), s)
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return &ecdsa.PublicKey{S256(), x, y}
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}
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func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
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sig, err = secp256k1.Sign(hash, prv.D.Bytes())
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return
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}
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func Encrypt(pub *ecdsa.PublicKey, message []byte) ([]byte, error) {
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return ecies.Encrypt(rand.Reader, ecies.ImportECDSAPublic(pub), message, nil, nil)
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}
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func Decrypt(prv *ecdsa.PrivateKey, ct []byte) ([]byte, error) {
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key := ecies.ImportECDSA(prv)
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return key.Decrypt(rand.Reader, ct, nil, nil)
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}
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