Create diam.go

identity/diam/diam.go

@@ -0,0 +1,33 @@
+package diam
+
+import (
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+)
+
+type Identity struct {
+	privateKey *ecdsa.PrivateKey
+	publicKey  *ecdsa.PublicKey
+}
+
+func NewIdentity() (*Identity, error) {
+	privateKey, err := ecdsa.GenerateKey(rand.Reader, 256)
+	if err != nil {
+		return nil, err
+	}
+	publicKey := privateKey.Public()
+
+	return &Identity{privateKey, publicKey}, nil
+}
+
+func (i *Identity) Sign(data []byte) ([]byte, error) {
+	hash := sha256.Sum256(data)
+	signature, err := i.privateKey.Sign(rand.Reader, hash[:], nil)
+	if err != nil {
+		return nil, err
+	}
+	return signature, nil
+}