/**
* public static native boolean twosComp2bn(byte[], int, int)
*/
static jboolean NativeBN_twosComp2bn(JNIEnv* env, jclass cls, jbyteArray arr, int bytesLen, BIGNUM* ret) {
if (!oneValidHandle(env, ret)) return FALSE;
jboolean success;
unsigned char* tmpBytes;
tmpBytes = (unsigned char*)((*env)->GetPrimitiveArrayCritical(env, arr, 0));
if (tmpBytes != NULL) {
if ((tmpBytes[0] & 0X80) == 0) { // Positive value!
//
// We can use the existing BN implementation for unsigned big endian bytes:
//
success = (BN_bin2bn(tmpBytes, bytesLen, ret) != NULL);
BN_set_negative(ret, FALSE);
}
else { // Negative value!
//
// We need to apply two's complement:
//
success = negBigEndianBytes2bn(env, cls, tmpBytes, bytesLen, ret);
BN_set_negative(ret, TRUE);
}
(*env)->ReleasePrimitiveArrayCritical(env, arr, tmpBytes, JNI_ABORT);
return success;
}
else return -1; // Error outside BN. mc FIXME: what to do in this case? Does JNI throw exception itself?
}
static jboolean NativeBN_twosComp2bn(JNIEnv* env, jclass cls, jbyteArray arr, int bytesLen, BIGNUM* ret) {
if (!oneValidHandle(env, ret)) return JNI_FALSE;
ScopedByteArrayRO bytes(env, arr);
if (bytes.get() == NULL) {
return -1;
}
jboolean success;
const unsigned char* s = reinterpret_cast<const unsigned char*>(bytes.get());
if ((bytes[0] & 0X80) == 0) { // Positive value!
//
// We can use the existing BN implementation for unsigned big endian bytes:
//
success = (BN_bin2bn(s, bytesLen, ret) != NULL);
BN_set_negative(ret, JNI_FALSE);
} else { // Negative value!
//
// We need to apply two's complement:
//
success = negBigEndianBytes2bn(env, cls, s, bytesLen, ret);
BN_set_negative(ret, JNI_TRUE);
}
return success;
}
extern "C" void Java_java_math_NativeBN_twosComp2bn(JNIEnv* env, jclass cls, jbyteArray arr, int bytesLen, jlong ret0) {
if (!oneValidHandle(env, ret0)) return;
BIGNUM* ret = toBigNum(ret0);
ScopedByteArrayRO bytes(env, arr);
if (bytes.get() == NULL) {
return;
}
const unsigned char* s = reinterpret_cast<const unsigned char*>(bytes.get());
if ((bytes[0] & 0X80) == 0) { // Positive value!
//
// We can use the existing BN implementation for unsigned big endian bytes:
//
BN_bin2bn(s, bytesLen, ret);
BN_set_negative(ret, false);
} else { // Negative value!
//
// We need to apply two's complement:
//
negBigEndianBytes2bn(env, cls, s, bytesLen, ret0);
BN_set_negative(ret, true);
}
throwExceptionIfNecessary(env);
}
