added some files

encrypter/rsa_encryptor.go

@@ -0,0 +1,30 @@
+package encrypter
+
+import (
+	"crypto"
+	"crypto/rsa"
+	"crypto/sha512"
+	"io"
+)
+
+var _ = sha512.New
+
+type RsaSha512 struct {
+	PrivateKey *rsa.PrivateKey
+}
+
+func (this *RsaSha512) hashIOReader(input io.Reader) ([]byte, error) {
+	hashFunction := crypto.SHA512.New()
+	if _, err := io.Copy(hashFunction, input); err != nil {
+		return nil, err
+	}
+	return hashFunction.Sum(nil), nil
+}
+
+func (this *RsaSha512) SignStream(input io.Reader, rand io.Reader) ([]byte, error) {
+	hashed, err := this.hashIOReader(input)
+	if err != nil {
+		return nil, err
+	}
+	return rsa.SignPSS(rand, this.PrivateKey, crypto.SHA512, hashed, nil)
+}