Add SignatureStructureTest to test various signature field accessors

pgpainless-core/src/test/java/org/pgpainless/signature/SignatureStructureTest.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright 2021 Paul Schaub.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.pgpainless.signature;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.bouncycastle.bcpg.sig.NotationData;
+import org.bouncycastle.openpgp.PGPSignature;
+import org.bouncycastle.util.encoders.Hex;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.pgpainless.algorithm.HashAlgorithm;
+import org.pgpainless.algorithm.PublicKeyAlgorithm;
+import org.pgpainless.algorithm.SignatureType;
+import org.pgpainless.key.OpenPgpV4Fingerprint;
+import org.pgpainless.key.util.KeyIdUtil;
+import org.pgpainless.signature.subpackets.SignatureSubpacketsUtil;
+import org.pgpainless.util.TestUtils;
+
+public class SignatureStructureTest {
+
+    private static PGPSignature signature;
+
+    @BeforeAll
+    public static void parseSignature() throws IOException {
+        // see https://tests.sequoia-pgp.org/#Detached_signature_with_Subpackets (base case)
+        signature = SignatureUtils.readSignatures("-----BEGIN PGP SIGNATURE-----\n" +
+                "\n" +
+                "wsE7BAABCABlBYJgv4U3RxQAAAAAAB4AIHNhbHRAbm90YXRpb25zLnNlcXVvaWEt\n" +
+                "cGdwLm9yZyPTSDcCaeqXuP6nWREE/C94XG6ABwpIlZHM08WewmWgFiEE0aZuGiOx\n" +
+                "gsmYD3iM+/zIKgFeczAACgkQ+/zIKgFeczBdoQv+MqOUYG+LA0Sa6P/827ILn9lW\n" +
+                "4IQJZVBo/ssvIU0Q8GjvCl4c/kRf+VKSprfkBz+q+vjHI1Ob0rW8amuTvvlSzBQX\n" +
+                "6Kb20ahvRYDo445Twuo+/rnp+j5PdRpYITY665AhdwfHSYoEEMhqrEDSQGT8O2xO\n" +
+                "1115FJEJaepomY4K9rv2pI8+pX9jOht7sCBK/qkTy/8RC22VyYWoPLSpxldzOBAK\n" +
+                "/AcuVCXFGfBt6ybRDXKJJduOVDQ5UFCoC71tq4ah7YmwIMD+/cXYPd+0Xg66U8Eq\n" +
+                "3F9MPYCzDYwnhEYZPuHODucHXZ0xpiFRlRkVMZT//+3b4NdOONRf/8sz9YUIMNxB\n" +
+                "U2qrEUnByfz3k1ZdkNwn40jYYWHp7hxVmaIDN3v+o5lZfzrKLTWU6wZThZL2FQlf\n" +
+                "SqGzjkxOW/c5OcO/EtCUNwIATpou32d1srfK0wGy2ar/o40yezukr5DLTo6B67Hq\n" +
+                "Z0D2bD+77247LmD4iuHMHxTI3yv2J+ecfM11Ejir\n" +
+                "=pQWH\n" +
+                "-----END PGP SIGNATURE-----\n").get(0);
+    }
+
+    @Test
+    public void testGetSignatureVersion() {
+        assertEquals(4, signature.getVersion());
+    }
+
+    @Test
+    public void testGetSignatureType() {
+        assertEquals(SignatureType.BINARY_DOCUMENT, SignatureType.valueOf(signature.getSignatureType()));
+    }
+
+    @Test
+    public void testGetAlgorithm() {
+        assertEquals(PublicKeyAlgorithm.RSA_GENERAL, PublicKeyAlgorithm.fromId(signature.getKeyAlgorithm()));
+    }
+
+    @Test
+    public void testGetHashAlgorithm() {
+        assertEquals(HashAlgorithm.SHA256, HashAlgorithm.fromId(signature.getHashAlgorithm()));
+    }
+
+    @Test
+    public void testGetSignatureCreationTime() {
+        assertEquals(TestUtils.getUTCDate("2021-06-08 14:56:55 UTC"), signature.getCreationTime());
+    }
+
+    @Test
+    public void testGetIssuerFingerprint() {
+        assertEquals(new OpenPgpV4Fingerprint("D1A66E1A23B182C9980F788CFBFCC82A015E7330"),
+                SignatureSubpacketsUtil.getIssuerFingerprintAsOpenPgpV4Fingerprint(signature));
+    }
+
+    @Test
+    public void testGetIssuer() {
+        assertEquals(KeyIdUtil.fromLongKeyId("FBFCC82A015E7330"), SignatureSubpacketsUtil.getIssuerKeyId(signature).getKeyID());
+    }
+
+    @Test
+    public void testGetNotations() {
+        List<NotationData> notations = SignatureSubpacketsUtil.getHashedNotationData(signature, "salt@notations.sequoia-pgp.org");
+        assertEquals(1, notations.size());
+        NotationData notation = notations.get(0);
+        assertEquals("23d348370269ea97b8fea7591104fc2f785c6e80070a489591ccd3c59ec265a0",
+                Hex.toHexString(notation.getNotationValueBytes()));
+    }
+
+    @Test
+    public void testGetSignatureDigestPrefix() {
+        assertEquals("5da1", SignatureUtils.getSignatureDigestPrefix(signature));
+    }
+}