From 8b345126ddf1e379c21f200199376265f4041994 Mon Sep 17 00:00:00 2001
From: Alfonso Lentini <valenzise.alfonso@gmail.com>
Date: Sat, 6 Apr 2019 12:50:10 +0200
Subject: [PATCH] =?UTF-8?q?=C3=82Google=20Tink=20implementation=20examples?=
MIME-Version: 1.0
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---
 libraries-security/pom.xml                    |   7 ++
 .../java/com/baeldung/tink/TinkUnitTest.java  | 101 ++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 libraries-security/src/test/java/com/baeldung/tink/TinkUnitTest.java

diff --git a/libraries-security/pom.xml b/libraries-security/pom.xml
index 9f125361ba..17d57fe203 100644
--- a/libraries-security/pom.xml
+++ b/libraries-security/pom.xml
@@ -32,6 +32,12 @@
             <version>${scribejava.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.google.crypto.tink</groupId>
+            <artifactId>tink</artifactId>
+            <version>${tink.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
@@ -55,6 +61,7 @@
         <scribejava.version>5.6.0</scribejava.version>
 		<spring-security-oauth2.version>2.3.3.RELEASE</spring-security-oauth2.version>
 		<passay.version>1.3.1</passay.version>
+        <tink.version>1.2.2</tink.version>
 		<cryptacular.version>1.2.2</cryptacular.version>
     </properties>
 </project>
diff --git a/libraries-security/src/test/java/com/baeldung/tink/TinkUnitTest.java b/libraries-security/src/test/java/com/baeldung/tink/TinkUnitTest.java
new file mode 100644
index 0000000000..b98c698016
--- /dev/null
+++ b/libraries-security/src/test/java/com/baeldung/tink/TinkUnitTest.java
@@ -0,0 +1,101 @@
+package com.baeldung.tink;
+
+import com.google.crypto.tink.*;
+import com.google.crypto.tink.aead.AeadConfig;
+import com.google.crypto.tink.aead.AeadFactory;
+import com.google.crypto.tink.aead.AeadKeyTemplates;
+import com.google.crypto.tink.config.TinkConfig;
+import com.google.crypto.tink.hybrid.HybridDecryptFactory;
+import com.google.crypto.tink.hybrid.HybridEncryptFactory;
+import com.google.crypto.tink.hybrid.HybridKeyTemplates;
+import com.google.crypto.tink.mac.MacFactory;
+import com.google.crypto.tink.mac.MacKeyTemplates;
+import com.google.crypto.tink.signature.PublicKeySignFactory;
+import com.google.crypto.tink.signature.PublicKeyVerifyFactory;
+import com.google.crypto.tink.signature.SignatureKeyTemplates;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.security.GeneralSecurityException;
+
+public class TinkUnitTest {
+
+    private static final String PLAINTEXT = "BAELDUNG";
+    private static final String DATA = "TINK";
+
+    @Test
+    public void givenPlaintext_whenEncryptWithAead_thenPlaintextIsEncrypted() throws GeneralSecurityException {
+
+        AeadConfig.register();
+
+        KeysetHandle keysetHandle = KeysetHandle.generateNew(
+                AeadKeyTemplates.AES256_GCM);
+
+        Aead aead = AeadFactory.getPrimitive(keysetHandle);
+
+        byte[] ciphertext = aead.encrypt(PLAINTEXT.getBytes(),
+                DATA.getBytes());
+
+        Assert.assertNotEquals(PLAINTEXT, new String(ciphertext));
+    }
+
+    @Test
+    public void givenData_whenComputeMAC_thenVerifyMAC() throws GeneralSecurityException {
+
+        TinkConfig.register();
+
+        KeysetHandle keysetHandle = KeysetHandle.generateNew(
+                MacKeyTemplates.HMAC_SHA256_128BITTAG);
+
+        Mac mac = MacFactory.getPrimitive(keysetHandle);
+
+        byte[] tag = mac.computeMac(DATA.getBytes());
+
+        mac.verifyMac(tag, DATA.getBytes());
+    }
+
+    @Test
+    public void givenData_whenSignData_thenVerifySignature() throws GeneralSecurityException {
+
+        TinkConfig.register();
+
+        KeysetHandle privateKeysetHandle = KeysetHandle.generateNew(
+                SignatureKeyTemplates.ECDSA_P256);
+
+        PublicKeySign signer = PublicKeySignFactory.getPrimitive(privateKeysetHandle);
+
+        byte[] signature = signer.sign(DATA.getBytes());
+
+        KeysetHandle publicKeysetHandle =
+                privateKeysetHandle.getPublicKeysetHandle();
+
+        PublicKeyVerify verifier = PublicKeyVerifyFactory.getPrimitive(publicKeysetHandle);
+
+        verifier.verify(signature, DATA.getBytes());
+    }
+
+    @Test
+    public void givenPlaintext_whenEncryptWithHybridEncryption_thenVerifyDecryptedIsEqual() throws GeneralSecurityException {
+
+        TinkConfig.register();
+
+        KeysetHandle privateKeysetHandle = KeysetHandle.generateNew(
+                HybridKeyTemplates.ECIES_P256_HKDF_HMAC_SHA256_AES128_CTR_HMAC_SHA256);
+
+        KeysetHandle publicKeysetHandle = privateKeysetHandle.getPublicKeysetHandle();
+
+        HybridEncrypt hybridEncrypt = HybridEncryptFactory.getPrimitive(publicKeysetHandle);
+
+        HybridDecrypt hybridDecrypt = HybridDecryptFactory.getPrimitive(privateKeysetHandle);
+
+        String contextInfo = "Tink";
+
+        byte[] ciphertext = hybridEncrypt.encrypt(PLAINTEXT.getBytes(), contextInfo.getBytes());
+
+        byte[] plaintextDecrypted = hybridDecrypt.decrypt(ciphertext, contextInfo.getBytes());
+
+        Assert.assertEquals(PLAINTEXT,new String(plaintextDecrypted));
+    }
+}
+
+