BAEL-4219 - How to read .pem file to get private and public key (#9676)

libraries-security/src/test/java/com/baeldung/pem/BouncyCastlePemUtilsUnitTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.pem;
+
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BouncyCastlePemUtilsUnitTest {
+
+    @Test
+    public void whenReadPublicKeyFromPEMFile_thenSuccess() throws Exception {
+        File pemFile = new File(BouncyCastlePemUtilsUnitTest.class.getResource("/pem/public-key.pem").getFile());
+
+        RSAPublicKey publicKey1 = BouncyCastlePemUtils.readX509PublicKey(pemFile);
+        RSAPublicKey publicKey2 = BouncyCastlePemUtils.readX509PublicKeySecondApproach(pemFile);
+
+        assertEquals("X.509", publicKey1.getFormat());
+        assertEquals("RSA", publicKey1.getAlgorithm());
+
+        assertEquals("X.509", publicKey2.getFormat());
+        assertEquals("RSA", publicKey2.getAlgorithm());
+    }
+
+    @Test
+    public void whenReadPrivateKeyFromPEMFile_thenSuccess() throws Exception {
+        File pemFile = new File(BouncyCastlePemUtilsUnitTest.class.getResource("/pem/private-key-pkcs8.pem").getFile());
+
+        RSAPrivateKey privateKey1 = BouncyCastlePemUtils.readPKCS8PrivateKey(pemFile);
+        RSAPrivateKey privateKey2 = BouncyCastlePemUtils.readPKCS8PrivateKeySecondApproach(pemFile);
+
+        assertEquals("PKCS#8", privateKey1.getFormat());
+        assertEquals("RSA", privateKey1.getAlgorithm());
+
+        assertEquals("PKCS#8", privateKey2.getFormat());
+        assertEquals("RSA", privateKey2.getAlgorithm());
+    }
+}