test: verify Sign / VerifySignature

internal/gpgx/signature_test.go

@@ -0,0 +1,28 @@
+package gpgx
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGPG_Signature(t *testing.T) {
+	privateKey, err := ReadPrivateKeyFile(privateKeyPath, password)
+	require.NoError(t, err)
+
+	input := []byte("hello, world")
+	signedData, err := Sign(input, privateKey)
+	require.NoError(t, err)
+	require.NotEmpty(t, signedData)
+
+	publicKey, err := ReadArmoredKeyFile(publicKeyPath)
+	require.NoError(t, err)
+	require.Len(t, publicKey, 1)
+
+	var expectedFingerprint [20]byte
+	copy(expectedFingerprint[:], publicKey[0].PrimaryKey.Fingerprint[:])
+
+	verifiedBytes, err := VerifySignature(signedData, publicKey, expectedFingerprint)
+	require.NoError(t, err)
+	require.Equal(t, string(input), string(verifiedBytes))
+}