1 files changed, 69 insertions, 1 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go
index e10a9e81f..b8fd78fa2 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -1,15 +1,23 @@
 package crypto
 
 import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
 	"crypto/sha256"
 
 	"code.google.com/p/go.crypto/ripemd160"
 	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/obscuren/ecies"
 	"github.com/obscuren/secp256k1-go"
 	"github.com/obscuren/sha3"
 )
 
-// TODO refactor, remove (bin)
+func init() {
+	// specify the params for the s256 curve
+	ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
+}
+
 func Sha3(data []byte) []byte {
 	d := sha3.NewKeccak256()
 	d.Write(data)
@@ -45,3 +53,63 @@ func Ecrecover(data []byte) []byte {
 
 	return r
 }
+
+// New methods using proper ecdsa keys from the stdlib
+func ToECDSA(prv []byte) *ecdsa.PrivateKey {
+	if len(prv) == 0 {
+		return nil
+	}
+
+	priv := new(ecdsa.PrivateKey)
+	priv.PublicKey.Curve = S256()
+	priv.D = ethutil.BigD(prv)
+	priv.PublicKey.X, priv.PublicKey.Y = S256().ScalarBaseMult(prv)
+	return priv
+}
+
+func FromECDSA(prv *ecdsa.PrivateKey) []byte {
+	if prv == nil {
+		return nil
+	}
+	return prv.D.Bytes()
+}
+
+func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
+	if len(pub) == 0 {
+		return nil
+	}
+	x, y := elliptic.Unmarshal(S256(), pub)
+	return &ecdsa.PublicKey{S256(), x, y}
+}
+
+func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
+	if pub == nil {
+		return nil
+	}
+	return elliptic.Marshal(S256(), pub.X, pub.Y)
+}
+
+func GenerateKey() (*ecdsa.PrivateKey, error) {
+	return ecdsa.GenerateKey(S256(), rand.Reader)
+}
+
+func SigToPub(hash, sig []byte) *ecdsa.PublicKey {
+	s := Ecrecover(append(hash, sig...))
+	x, y := elliptic.Unmarshal(S256(), s)
+
+	return &ecdsa.PublicKey{S256(), x, y}
+}
+
+func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
+	sig, err = secp256k1.Sign(hash, prv.D.Bytes())
+	return
+}
+
+func Encrypt(pub *ecdsa.PublicKey, message []byte) ([]byte, error) {
+	return ecies.Encrypt(rand.Reader, ecies.ImportECDSAPublic(pub), message, nil, nil)
+}
+
+func Decrypt(prv *ecdsa.PrivateKey, ct []byte) ([]byte, error) {
+	key := ecies.ImportECDSA(prv)
+	return key.Decrypt(rand.Reader, ct, nil, nil)
+}