1 files changed, 46 insertions, 0 deletions
diff --git a/vendor/github.com/wybiral/torgo/rsa.go b/vendor/github.com/wybiral/torgo/rsa.go
new file mode 100644
index 0000000..c0c49b6
--- /dev/null
+++ b/vendor/github.com/wybiral/torgo/rsa.go
@@ -0,0 +1,46 @@
+package torgo
+
+import (
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/x509"
+	"encoding/asn1"
+	"encoding/base32"
+	"encoding/base64"
+	"errors"
+	"strings"
+)
+
+// OnionFromRSA returns an Onion instance from a 1024 bit RSA private key which
+// can be used to start a hidden service with controller.AddOnion.
+func OnionFromRSA(pri *rsa.PrivateKey) (*Onion, error) {
+	pub, ok := pri.Public().(*rsa.PublicKey)
+	if !ok {
+		return nil, errors.New("torgo: unable to extract *rsa.PublicKey")
+	}
+	serviceID, err := ServiceIDFromRSA(pub)
+	if err != nil {
+		return nil, err
+	}
+	der := x509.MarshalPKCS1PrivateKey(pri)
+	key := base64.StdEncoding.EncodeToString(der)
+	return &Onion{
+		Ports:          make(map[int]string),
+		ServiceID:      serviceID,
+		PrivateKey:     key,
+		PrivateKeyType: "RSA1024",
+	}, nil
+}
+
+// ServiceIDFromRSA calculates a Tor service ID from an *rsa.PublicKey.
+func ServiceIDFromRSA(pub *rsa.PublicKey) (string, error) {
+	der, err := asn1.Marshal(*pub)
+	if err != nil {
+		return "", err
+	}
+	// Onion id is base32(firstHalf(sha1(publicKeyDER)))
+	hash := sha1.Sum(der)
+	half := hash[:len(hash)/2]
+	serviceID := base32.StdEncoding.EncodeToString(half)
+	return strings.ToLower(serviceID), nil
+}