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asymetric/rsaOaepEncrypter.go

@@ -0,0 +1,47 @@
+package asymetric
+
+import (
+	_ "crypto/sha256"
+	_ "crypto/sha512"
+
+	"crypto"
+	"crypto/rsa"
+	"errors"
+	"fmt"
+	"io"
+)
+
+type RsaOaepEncrypter struct {
+	PrivateKey *rsa.PrivateKey
+	PublicKey  *rsa.PublicKey
+	Hash       crypto.Hash
+
+	Random io.Reader
+}
+
+func (this *RsaOaepEncrypter) getHash() (crypto.Hash, error) {
+	if !this.Hash.Available() {
+		return 0, errors.New(fmt.Sprintf("hash function %v is unabailable", this.Hash))
+	} else {
+		return this.Hash, nil
+	}
+}
+
+func (this *RsaOaepEncrypter) Encrypt(data []byte) ([]byte, error) {
+	label := make([]byte, 0)
+	if hash, err := this.getHash(); err != nil {
+		return nil, err
+	} else {
+		return rsa.EncryptOAEP(hash.New(), this.Random, this.PublicKey, data, label)
+	}
+
+}
+
+func (this *RsaOaepEncrypter) Decrypt(ciphertext []byte) ([]byte, error) {
+	label := make([]byte, 0)
+	if hash, err := this.getHash(); err != nil {
+		return nil, err
+	} else {
+		return rsa.DecryptOAEP(hash.New(), this.Random, this.PrivateKey, ciphertext, label)
+	}
+}