Refactor setup

src/gitlab.com/ProtonMail/go-pm-crypto/key/fingerprint.go

@@ -0,0 +1,33 @@
+package key
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+
+	"golang.org/x/crypto/openpgp"
+	"gitlab.com/ProtonMail/go-pm-crypto/armor"
+)
+
+// GetFingerprint get a armored public key fingerprint
+func GetFingerprint(publicKey string) (string, error) {
+	rawPubKey, err := armor.Unarmor(publicKey)
+	if err != nil {
+		return "", err
+	}
+	return GetFingerprintBinKey(rawPubKey)
+}
+
+// GetFingerprintBinKey get a unarmored public key fingerprint
+func GetFingerprintBinKey(publicKey []byte) (string, error) {
+	pubKeyReader := bytes.NewReader(publicKey)
+	pubKeyEntries, err := openpgp.ReadKeyRing(pubKeyReader)
+	if err != nil {
+		return "", err
+	}
+	for _, e := range pubKeyEntries {
+		fp := e.PrimaryKey.Fingerprint
+		return hex.EncodeToString(fp[:]), nil
+	}
+	return "", errors.New("Can't find public key")
+}