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authorobscuren <geffobscura@gmail.com>2014-12-10 07:03:21 +0800
committerobscuren <geffobscura@gmail.com>2014-12-10 07:03:21 +0800
commit87adff7e189ee0a1fd50a3ef30ba22482e60f314 (patch)
treec0296eda7253cd468bf05bf08fa5580d4cfec7d5 /crypto/crypto.go
parentc24018e273e5457f7c5bf6af1b541bb55b19ec8d (diff)
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Added Encrypt & Decrypt using the ECIES w/ tests
Diffstat (limited to 'crypto/crypto.go')
-rw-r--r--crypto/crypto.go42
1 files changed, 42 insertions, 0 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go
index e10a9e81f..87dd72dc7 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -1,14 +1,35 @@
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"
)
+func init() {
+ // specify the params for the s256 curve
+ ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
+}
+
+func ToECDSA(prv []byte) *ecdsa.PrivateKey {
+ 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 {
+ return prv.D.Bytes()
+}
+
// TODO refactor, remove (bin)
func Sha3(data []byte) []byte {
d := sha3.NewKeccak256()
@@ -45,3 +66,24 @@ func Ecrecover(data []byte) []byte {
return r
}
+
+func SigToPub(hash, sig []byte) []byte {
+ return Ecrecover(append(hash, sig...))
+}
+
+func Sign(hash, prv []byte) (sig []byte, err error) {
+ sig, err = secp256k1.Sign(hash, prv)
+ return
+}
+
+func Encrypt(pub, message []byte) ([]byte, error) {
+ x, y := elliptic.Unmarshal(S256(), pub)
+ epub := &ecdsa.PublicKey{S256(), x, y}
+
+ return ecies.Encrypt(rand.Reader, ecies.ImportECDSAPublic(epub), message, nil, nil)
+}
+
+func Decrypt(prv, ct []byte) ([]byte, error) {
+ key := ecies.ImportECDSA(ToECDSA(prv))
+ return key.Decrypt(rand.Reader, ct, nil, nil)
+}