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-rw-r--r--jni/curve25519-jni.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/jni/curve25519-jni.c b/jni/curve25519-jni.c
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+/**
+ * Copyright (C) 2013-2014 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include <stdint.h>
+
+#include <jni.h>
+#include "curve25519-donna.h"
+#include "curve_sigs.h"
+
+JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_libaxolotl_ecc_Curve25519_generatePrivateKey
+ (JNIEnv *env, jclass clazz, jbyteArray random)
+{
+ uint8_t* privateKey = (uint8_t*)(*env)->GetByteArrayElements(env, random, 0);
+
+ privateKey[0] &= 248;
+ privateKey[31] &= 127;
+ privateKey[31] |= 64;
+
+ (*env)->ReleaseByteArrayElements(env, random, privateKey, 0);
+
+ return random;
+}
+
+JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_libaxolotl_ecc_Curve25519_generatePublicKey
+ (JNIEnv *env, jclass clazz, jbyteArray privateKey)
+{
+ static const uint8_t basepoint[32] = {9};
+
+ jbyteArray publicKey = (*env)->NewByteArray(env, 32);
+ uint8_t* publicKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, publicKey, 0);
+ uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
+
+ curve25519_donna(publicKeyBytes, privateKeyBytes, basepoint);
+
+ (*env)->ReleaseByteArrayElements(env, publicKey, publicKeyBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
+
+ return publicKey;
+}
+
+JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_libaxolotl_ecc_Curve25519_calculateAgreement
+ (JNIEnv *env, jclass clazz, jbyteArray privateKey, jbyteArray publicKey)
+{
+ jbyteArray sharedKey = (*env)->NewByteArray(env, 32);
+ uint8_t* sharedKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, sharedKey, 0);
+ uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
+ uint8_t* publicKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, publicKey, 0);
+
+ curve25519_donna(sharedKeyBytes, privateKeyBytes, publicKeyBytes);
+
+ (*env)->ReleaseByteArrayElements(env, sharedKey, sharedKeyBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, publicKey, publicKeyBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
+
+ return sharedKey;
+}
+
+JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_libaxolotl_ecc_Curve25519_calculateSignature
+ (JNIEnv *env, jclass clazz, jbyteArray random, jbyteArray privateKey, jbyteArray message)
+{
+ jbyteArray signature = (*env)->NewByteArray(env, 64);
+ uint8_t* signatureBytes = (uint8_t*)(*env)->GetByteArrayElements(env, signature, 0);
+ uint8_t* randomBytes = (uint8_t*)(*env)->GetByteArrayElements(env, random, 0);
+ uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
+ uint8_t* messageBytes = (uint8_t*)(*env)->GetByteArrayElements(env, message, 0);
+ jsize messageLength = (*env)->GetArrayLength(env, message);
+
+ int result = curve25519_sign(signatureBytes, privateKeyBytes, messageBytes, messageLength, randomBytes);
+
+ (*env)->ReleaseByteArrayElements(env, signature, signatureBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, random, randomBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, message, messageBytes, 0);
+
+ if (result == 0) return signature;
+ else (*env)->ThrowNew(env, (*env)->FindClass(env, "java/lang/AssertionError"), "Signature failed!");
+}
+
+JNIEXPORT jboolean JNICALL Java_org_whispersystems_libaxolotl_ecc_Curve25519_verifySignature
+ (JNIEnv *env, jclass clazz, jbyteArray publicKey, jbyteArray message, jbyteArray signature)
+{
+ uint8_t* signatureBytes = (uint8_t*)(*env)->GetByteArrayElements(env, signature, 0);
+ uint8_t* publicKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, publicKey, 0);
+ uint8_t* messageBytes = (uint8_t*)(*env)->GetByteArrayElements(env, message, 0);
+ jsize messageLength = (*env)->GetArrayLength(env, message);
+
+ jboolean result = (curve25519_verify(signatureBytes, publicKeyBytes, messageBytes, messageLength) == 0);
+
+ (*env)->ReleaseByteArrayElements(env, signature, signatureBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, publicKey, publicKeyBytes, 0);
+ (*env)->ReleaseByteArrayElements(env, message, messageBytes, 0);
+
+ return result;
+}