Add context for Java

RELEASE.md

@@ -1,4 +1,4 @@
-liboqs-java version 0.1.0
+liboqs-java version 0.2.0
 =========================
 
 About
@@ -14,3 +14,5 @@ Release notes
 =============
 
 The initial release of liboqs-java was released on July 8, 2020. Its release page on GitHub is https://github.com/open-quantum-safe/liboqs-java/releases/tag/0.1.0.
+
+Release 0.2.0 from January 2025 added support for Signature and Verify API's which accept a Context String.

pom.xml

@@ -6,7 +6,7 @@
     <groupId>org.openquantumsafe</groupId>
     <artifactId>liboqs-java</artifactId>
     <packaging>jar</packaging>
-    <version>1.0</version>
+    <version>2.0</version>
     <name>liboqs-java: Java wrapper for liboqs</name>
     <description>liboqs-java offers a Java wrapper providing quantum-resistant cryptographic algorithms via liboqs.</description>
 

src/main/c/Signature.c

@@ -122,6 +122,7 @@ JNIEXPORT jint JNICALL Java_org_openquantumsafe_Signature_sign
 
     OQS_SIG *sig = (OQS_SIG *) getHandle(env, obj, "native_sig_handle_");
     size_t len_sig;
+
     OQS_STATUS rv_ = OQS_SIG_sign(sig, (uint8_t*)signature_native, &len_sig,
                                     (uint8_t*)message_native, message_len,
                                     (uint8_t*)secret_key_native);
@@ -173,3 +174,81 @@ JNIEXPORT jboolean JNICALL Java_org_openquantumsafe_Signature_verify
 
     return (rv_ == OQS_SUCCESS) ? JNI_TRUE : JNI_FALSE;
 }
+
+/*
+ * Class:     org_openquantumsafe_Signature
+ * Method:    sign_with_ctx_str
+ * Signature: ([BLjava/lang/Long;[BJ[B)I
+ */
+JNIEXPORT jint JNICALL Java_org_openquantumsafe_Signature_sign_1with_1ctx_1str
+  (JNIEnv * env, jobject obj, jbyteArray jsignature, jobject sig_len_obj,
+      jbyteArray jmessage, jlong message_len, jbyteArray jctx, jlong ctx_len,
+      jbyteArray jsecret_key)
+{
+    // Convert to jbyte arrays
+    jbyte *signature_native = (*env)->GetByteArrayElements(env, jsignature, 0);
+    jbyte *message_native = (*env)->GetByteArrayElements(env, jmessage, 0);
+    jbyte *ctx_native = (*env)->GetByteArrayElements(env, jctx, 0);
+    jbyte *secret_key_native = (*env)->GetByteArrayElements(env, jsecret_key, 0);
+
+    OQS_SIG *sig = (OQS_SIG *) getHandle(env, obj, "native_sig_handle_");
+    size_t len_sig;
+    OQS_STATUS rv_ = OQS_SIG_sign_with_ctx_str(sig, (uint8_t*)signature_native, &len_sig,
+                                    (uint8_t*)message_native, message_len,
+                                    (uint8_t*)ctx_native, ctx_len,
+                                    (uint8_t*)secret_key_native);
+
+    // fill java signature bytes
+    (*env)->SetByteArrayRegion(env, jsignature, 0, len_sig, (jbyte*) signature_native);
+
+    // fill java object signature length
+    jfieldID value_fid = (*env)->GetFieldID(env,
+                                    (*env)->GetObjectClass(env, sig_len_obj),
+                                    "value", "Ljava/lang/Object;");
+    jclass cls = (*env)->FindClass(env, "java/lang/Long");
+    jobject jlong_obj = (*env)->NewObject(env, cls,
+                                (*env)->GetMethodID(env, cls, "<init>", "(J)V"),
+                                (jlong) len_sig);
+    (*env)->SetObjectField(env, sig_len_obj, value_fid, jlong_obj);
+
+    // Release C memory
+    (*env)->ReleaseByteArrayElements(env, jsignature, signature_native, 0);
+    (*env)->ReleaseByteArrayElements(env, jmessage, message_native, JNI_ABORT);
+    (*env)->ReleaseByteArrayElements(env, jctx, ctx_native, JNI_ABORT);
+    (*env)->ReleaseByteArrayElements(env, jsecret_key, secret_key_native, JNI_ABORT);
+
+    return (rv_ == OQS_SUCCESS) ? 0 : -1;
+}
+
+/*
+ * Class:     org_openquantumsafe_Signature
+ * Method:    verify_with_ctx_str
+ * Signature: ([BJ[BJ[B)Z
+ */
+JNIEXPORT jboolean JNICALL Java_org_openquantumsafe_Signature_verify_1with_1ctx_1str
+  (JNIEnv *env, jobject obj, jbyteArray jmessage, jlong message_len,
+      jbyteArray jsignature, jlong signature_len, jbyteArray jctx, jlong ctx_len,
+      jbyteArray jpublic_key)
+{
+    // Convert to jbyte arrays
+    jbyte *message_native = (*env)->GetByteArrayElements(env, jmessage, 0);
+    jbyte *signature_native = (*env)->GetByteArrayElements(env, jsignature, 0);
+    jbyte *ctx_native = (*env)->GetByteArrayElements(env, jctx, 0);
+    jbyte *public_key_native = (*env)->GetByteArrayElements(env, jpublic_key, 0);
+
+    OQS_SIG *sig = (OQS_SIG *) getHandle(env, obj, "native_sig_handle_");
+    OQS_STATUS rv_ = OQS_SIG_verify_with_ctx_str(sig, (uint8_t*) message_native, message_len,
+                                    (uint8_t*) signature_native, signature_len,
+                                    (uint8_t*) ctx_native, ctx_len,
+                                    (uint8_t*) public_key_native);
+
+    // Release C memory
+    (*env)->ReleaseByteArrayElements(env, jsignature, signature_native, JNI_ABORT);
+    (*env)->ReleaseByteArrayElements(env, jmessage, message_native, JNI_ABORT);
+    (*env)->ReleaseByteArrayElements(env, jctx, ctx_native, JNI_ABORT);
+    (*env)->ReleaseByteArrayElements(env, jpublic_key, public_key_native, JNI_ABORT);
+
+    return (rv_ == OQS_SUCCESS) ? JNI_TRUE : JNI_FALSE;
+}
+
+

src/main/java/org/openquantumsafe/Signature.java

@@ -146,6 +146,51 @@ private native int sign(byte[] signature, Mutable<Long> signature_len_ret,
     private native boolean verify(byte[] message, long message_len,
                                 byte[] signature, long signature_len,
                                 byte[] public_key);
+
+    /**
+     * \brief Wrapper for OQS_API OQS_STATUS OQS_SIG_sign_with_ctx_str(const OQS_SIG *sig,
+     *                                              uint8_t *signature,
+     *                                              size_t *signature_len,
+     *                                              const uint8_t *message,
+     *                                              size_t message_len,
+     *                                              const uint8_t *ctx,
+     *                                              size_t ctx_len,
+     *                                              const uint8_t *secret_key);
+     * \param signature
+     * \param signature_len_ret
+     * \param message
+     * \param message_len
+     * \param ctx
+     * \param ctx_len
+     * \param secret_key
+     * \return Status
+     */
+    private native int sign_with_ctx_str(byte[] signature, Mutable<Long> signature_len_ret,
+                        byte[] message, long message_len, byte[] ctx, long ctx_len,
+                        byte[] secret_key);
+
+    /**
+     * \brief Wrapper for OQS_API OQS_STATUS OQS_SIG_verify_with_ctx_str(const OQS_SIG *sig,
+     *                                              const uint8_t *message,
+     *                                              size_t message_len,
+     *                                              const uint8_t *signature,
+     *                                              size_t signature_len,
+     *                                              const uint8_t *ctx,
+     *                                              size_t ctx_len,
+     *                                              const uint8_t *public_key);
+     * \param message
+     * \param message_len
+     * \param signature
+     * \param signature_len
+     * \param ctx
+     * \param ctx_len
+     * \param public_key
+     * \return True if the signature is valid, false otherwise
+     */
+    private native boolean verify_with_ctx_str(byte[] message, long message_len,
+                                byte[] signature, long signature_len,
+                                byte[] ctx, long ctx_len,
+                                byte[] public_key);
 
     /**
      * \brief Invoke native free_sig
@@ -220,6 +265,55 @@ public boolean verify(byte[] message, byte[] signature, byte[] public_key)
 
         return verify(message, message.length, signature, signature.length, public_key);
     }
+
+    /**
+     * \brief Invoke native sign method
+     * \param message
+     * \param ctx
+     * \return signature
+     */
+    public byte[] sign(byte[] message, byte[] ctx) throws RuntimeException {
+        if (this.secret_key_.length != alg_details_.length_secret_key) {
+            throw new RuntimeException("Incorrect secret key length, " +
+                                    "make sure you specify one in the " +
+                                    "constructor or run generate_keypair()");
+        }
+        byte[] signature = new byte[(int) alg_details_.max_length_signature];
+        Mutable<Long> signature_len_ret = new Mutable<>();
+        int ctx_len = (ctx == null) ? 0 : ctx.length;
+        int rv_= sign_with_ctx_str(signature, signature_len_ret,
+                        message, message.length, 
+                        ctx, ctx_len,
+                        this.secret_key_);
+        long actual_signature_len = signature_len_ret.value;
+        byte[] actual_signature = new byte[(int) actual_signature_len];
+        System.arraycopy(signature, 0,
+                            actual_signature, 0, (int) actual_signature_len);
+        if (rv_ != 0) throw new RuntimeException("Cannot sign message");
+        return actual_signature;
+    }
+
+    /**
+     * \brief Invoke native verify method
+     * \param message
+     * \param signature
+     * \param ctx
+     * \param public_key
+     * \return True if the signature is valid, false otherwise
+     */
+    public boolean verify(byte[] message, byte[] signature, byte[] ctx, byte[] public_key)
+                                                    throws RuntimeException {
+        if (public_key.length != alg_details_.length_public_key) {
+            throw new RuntimeException("Incorrect public key length");
+        }
+        if (signature.length > alg_details_.max_length_signature) {
+            throw new RuntimeException("Incorrect signature length");
+        }
+
+        int ctx_len = (ctx == null) ? 0 : ctx.length;
+
+        return verify_with_ctx_str(message, message.length, signature, signature.length, ctx, ctx_len, public_key);
+    }
 
     /**
      * \brief Print Signature. If a SignatureDetails object is not

src/test/java/org/openquantumsafe/SigTest.java

@@ -5,9 +5,12 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
+
+// import static org.junit.Assert.fail;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.stream.Stream;
 
 public class SigTest {
@@ -22,6 +25,7 @@ public class SigTest {
     public static void init(){
         System.out.println("Initialize list of enabled Signatures");
         enabled_sigs = Sigs.get_enabled_sigs();
+        System.out.println("Enabled signatures: [" + enabled_sigs + "]" );
     }
 
     /**
@@ -53,6 +57,36 @@ public void testAllSigs(String sig_name) {
         sb.append("\033[0;32m").append("PASSED").append("\033[0m");
         System.out.println(sb.toString());
     }
+
+    /**
+     * Test Sigs with context.
+     */
+    @ParameterizedTest(name = "Testing {arguments}")
+    @MethodSource("getContextSupportedAlgsAsStream")
+    public void testSigsWithContext(String sig_name) {
+    	byte[] context = "01234567890".getBytes();
+        StringBuilder sb = new StringBuilder();
+        sb.append(sig_name);
+        sb.append(String.format("%1$" + (40 - sig_name.length()) + "s", ""));
+
+        // Create signer and verifier
+        Signature signer = new Signature(sig_name);
+        Signature verifier = new Signature(sig_name);
+
+         // Generate signer key pair
+        byte[] signer_public_key = signer.generate_keypair();
+
+        // Sign the message
+        byte[] signature = signer.sign(message, context);
+
+        // Verify the signature
+        boolean is_valid = verifier.verify(message, signature, context, signer_public_key);
+        assertTrue(is_valid, sig_name);
+
+        // If successful print Sig name, otherwise an exception will be thrown
+        sb.append("\033[0;32m").append("PASSED").append("\033[0m");
+        System.out.println(sb.toString());
+    }
 
     /**
      * Test the MechanismNotSupported Exception
@@ -69,4 +103,12 @@ private static Stream<String> getEnabledSigsAsStream() {
         return enabled_sigs.parallelStream();
     }
 
+    /**
+     * Method to convert the list of ML-DSA Sigs to a stream for input to testAllSigs
+     */
+    private static Stream<String> getContextSupportedAlgsAsStream() {
+    	return Arrays.asList(
+                "ML-DSA-44", "ML-DSA-65", "ML-DSA-87"
+            ).parallelStream();
+    }
 }