方法调用给出相同参数的结果不一致

Question

对于blake2b哈希，这是一种功能性方法，我得到的结果不一致。在我看来，这个问题是在Java方面，它以某种方式对两个方法调用之间的输入参数进行了更改。我无法理解两次调用SodiumJNI.crypto_generichash_blake2b_salt_personal_no_input之间的输入参数是怎么回事。本机函数（如下所示）不会对key，salt和info进行任何更改。因此，输出应相同，但不相同。

我的测试方法如下：

 import android.util.Base64;
 import android.util.Log;

 static void kdf() {
        final byte[] key = new byte[32];
        final byte[] salt = new byte[32];
        final byte[] info = Base64.decode("aGFuZHNoYWtl", Base64.DEFAULT);

        byte[] out0 = new byte[64];
        int result0 = SodiumJNI.crypto_generichash_blake2b_salt_personal_no_input(out0, out0.length, key, key.length, salt, info);
        if (result0 == 0) {
            Log.d("Tests", "out0: " + Base64.encodeToString(out0, Base64.DEFAULT));
            //prints:
            //out0: nCzeDcbw1YmdPq+jYnslNDoXKNyXMvIsqx9QJ1PLRNPxh7dvXkTeSkF2REYznHExaWCQP7J0kFvDu9l9ECs4VQ==
        }

        byte[] out1 = new byte[64];
        int result1 = SodiumJNI.crypto_generichash_blake2b_salt_personal_no_input(out1, out1.length, key, key.length, salt, info);
        if (result1 == 0) {
            Log.d("Tests", "out1: " + Base64.encodeToString(out1, Base64.DEFAULT));
             //prints;
             //out1: dNfj+ccfGzTDiTAgzHNE5Hujyxnl6yX2BAPamCBw8X3fPYgbdtNDPoA3JKQGCziJw40wVTr/kPCpVUqMqMiVKw==
        }
    }

现在奇怪的是，out0和out1并不相同。

本机函数实现如下：

public class SodiumJNI {

    public final static native int sodium_init();
    public final static native int crypto_generichash_blake2b_salt_personal_no_input(byte[] out, int outlen, byte [] key, int keylen, byte[] salt, byte[] personal);

    static {
        try {
            System.loadLibrary("sodiumjni");
            if (sodium_init() == -1) {
                throw new RuntimeException("Sodium could not be initialized.");
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);


        }
    }
}

本机函数：

JNIEXPORT jint JNICALL Java_com_app_jni_SodiumJNI_crypto_1generichash_1blake2b_1salt_1personal_1no_1input(JNIEnv *jenv, jclass jcls,
  jbyteArray joutput, jint joutlength, jbyteArray jkey, jint jkeylength, jbyteArray jsalt, jbyteArray jpersonal) {
  jint jresult = 0 ;
  unsigned char *output = (unsigned char *) 0 ;
  size_t outlength ;
  unsigned char *key = (unsigned char *) 0 ;
  size_t keylength ;
  unsigned char *salt = (unsigned char *) 0 ;
  unsigned char *personal = (unsigned char *) 0 ;
  int result;

  (void)jenv;
  (void)jcls;
  {
    output = (unsigned char *) (*jenv)->GetByteArrayElements(jenv, joutput, 0);
  }
  outlength = (size_t)joutlength;
  {
    key = (unsigned char *) (*jenv)->GetByteArrayElements(jenv, jkey, 0);
  }
  keylength = (size_t)jkeylength;
  {
    salt = (unsigned char *) (*jenv)->GetByteArrayElements(jenv, jsalt, 0);
  }
  {
    personal = (unsigned char *) (*jenv)->GetByteArrayElements(jenv, jpersonal, 0);
  }

  result = (int)crypto_generichash_blake2b_salt_personal(output,
      outlength,
      NULL,
      0,
      (unsigned char const *)key,
      keylength,
      (unsigned char const *)salt,
      (unsigned char const *)personal);
  jresult = (jint)result;
  {
    (*jenv)->ReleaseByteArrayElements(jenv, joutput, (jbyte *) output, 0);
  }
  {
    (*jenv)->ReleaseByteArrayElements(jenv, jkey, (jbyte *) key, JNI_ABORT);
  }
  {
    (*jenv)->ReleaseByteArrayElements(jenv, jsalt, (jbyte *) salt, JNI_ABORT);
  }
  {
    (*jenv)->ReleaseByteArrayElements(jenv, jpersonal, (jbyte *) personal, JNI_ABORT);
  }
  return jresult;
}