forked from cerc-io/plugeth
Added Encrypt & Decrypt using the ECIES w/ tests
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parent
c24018e273
commit
87adff7e18
@ -1,14 +1,35 @@
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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 ToECDSA(prv []byte) *ecdsa.PrivateKey {
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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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return prv.D.Bytes()
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}
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// TODO refactor, remove (bin)
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func Sha3(data []byte) []byte {
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d := sha3.NewKeccak256()
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@ -45,3 +66,24 @@ func Ecrecover(data []byte) []byte {
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return r
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}
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func SigToPub(hash, sig []byte) []byte {
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return Ecrecover(append(hash, sig...))
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}
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func Sign(hash, prv []byte) (sig []byte, err error) {
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sig, err = secp256k1.Sign(hash, prv)
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return
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}
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func Encrypt(pub, message []byte) ([]byte, error) {
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x, y := elliptic.Unmarshal(S256(), pub)
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epub := &ecdsa.PublicKey{S256(), x, y}
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return ecies.Encrypt(rand.Reader, ecies.ImportECDSAPublic(epub), message, nil, nil)
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}
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func Decrypt(prv, ct []byte) ([]byte, error) {
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key := ecies.ImportECDSA(ToECDSA(prv))
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return key.Decrypt(rand.Reader, ct, nil, nil)
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}
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40
crypto/encrypt_decrypt_test.go
Normal file
40
crypto/encrypt_decrypt_test.go
Normal file
@ -0,0 +1,40 @@
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package crypto
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import (
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"bytes"
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"fmt"
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"testing"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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func TestBox(t *testing.T) {
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prv1 := ethutil.Hex2Bytes("4b50fa71f5c3eeb8fdc452224b2395af2fcc3d125e06c32c82e048c0559db03f")
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prv2 := ethutil.Hex2Bytes("d0b043b4c5d657670778242d82d68a29d25d7d711127d17b8e299f156dad361a")
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pub2 := ethutil.Hex2Bytes("04bd27a63c91fe3233c5777e6d3d7b39204d398c8f92655947eb5a373d46e1688f022a1632d264725cbc7dc43ee1cfebde42fa0a86d08b55d2acfbb5e9b3b48dc5")
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message := []byte("Hello, world.")
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ct, err := Encrypt(pub2, message)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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pt, err := Decrypt(prv2, ct)
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if err != nil {
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fmt.Println(err.Error())
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t.FailNow()
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}
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if !bytes.Equal(pt, message) {
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fmt.Println("ecies: plaintext doesn't match message")
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t.FailNow()
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}
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_, err = Decrypt(prv1, pt)
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if err == nil {
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fmt.Println("ecies: encryption should not have succeeded")
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t.FailNow()
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}
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}
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