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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/**
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* Copyright (C) 2013 Open Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <stdint.h>
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#include <jni.h>
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#include "curve25519-donna.h"
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JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_textsecure_crypto_ecc_Curve25519_generatePrivateKey
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(JNIEnv *env, jclass clazz, jbyteArray random, jboolean ephemeral)
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{
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uint8_t* privateKey = (uint8_t*)(*env)->GetByteArrayElements(env, random, 0);
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privateKey[0] &= 248;
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if (ephemeral) {
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privateKey[0] |= 1;
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}
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privateKey[31] &= 127;
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privateKey[31] |= 64;
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(*env)->ReleaseByteArrayElements(env, random, privateKey, 0);
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return random;
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}
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JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_textsecure_crypto_ecc_Curve25519_generatePublicKey
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(JNIEnv *env, jclass clazz, jbyteArray privateKey)
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{
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static const uint8_t basepoint[32] = {9};
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jbyteArray publicKey = (*env)->NewByteArray(env, 32);
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uint8_t* publicKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, publicKey, 0);
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uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
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curve25519_donna(publicKeyBytes, privateKeyBytes, basepoint);
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(*env)->ReleaseByteArrayElements(env, publicKey, publicKeyBytes, 0);
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(*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
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return publicKey;
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}
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JNIEXPORT jbyteArray JNICALL Java_org_whispersystems_textsecure_crypto_ecc_Curve25519_calculateAgreement
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(JNIEnv *env, jclass clazz, jbyteArray privateKey, jbyteArray publicKey)
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{
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jbyteArray sharedKey = (*env)->NewByteArray(env, 32);
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uint8_t* sharedKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, sharedKey, 0);
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uint8_t* privateKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, privateKey, 0);
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uint8_t* publicKeyBytes = (uint8_t*)(*env)->GetByteArrayElements(env, publicKey, 0);
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curve25519_donna(sharedKeyBytes, privateKeyBytes, publicKeyBytes);
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(*env)->ReleaseByteArrayElements(env, sharedKey, sharedKeyBytes, 0);
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(*env)->ReleaseByteArrayElements(env, publicKey, publicKeyBytes, 0);
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(*env)->ReleaseByteArrayElements(env, privateKey, privateKeyBytes, 0);
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return sharedKey;
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}
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