Examples of java.math.BigInteger.toByteArray()

java.math.BigInteger.toByteArray()
Returns a byte array containing the two's-complement representation of this BigInteger. The byte array will be in big-endian byte-order: the most significant byte is in the zeroth element. The array will contain the minimum number of bytes required to represent this BigInteger, including at least one sign bit, which is {@code (ceil((this.bitLength() +1)/8))}. (This representation is compatible with the {@link #BigInteger(byte[]) (byte[])} constructor.) @return a byte array containing the two's-complement representation ofthis BigInteger. @see #BigInteger(byte[])

    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger exp =    new BigInteger(eSign, eBytes);
    BigInteger modulus = new BigInteger(mSign, mBytes);
    BigInteger result = aNumber.modPow(exp, modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {47, 3, 96, 62, 87, 19};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger modulus = new BigInteger(mSign, mBytes);
    BigInteger result = aNumber.modInverse(modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {1, -93, 40, 127, 73};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger modulus = new BigInteger(mSign, mBytes);
    BigInteger result = aNumber.modInverse(modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {0, -41, 4, -91, 27};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger modulus = new BigInteger(mSign, mBytes);
    BigInteger result = aNumber.modInverse(modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {85, 47, 127, 4, -128, 45};
    BigInteger aNumber = new BigInteger(aBytes);
    BigInteger modulus = new BigInteger(mBytes);
    BigInteger result = aNumber.modInverse(modulus);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {15, 24, 123, 57, -15, 24, 123, 57, -15, 24, 123, 57};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger bNumber = new BigInteger(bSign, bBytes);
    BigInteger result = aNumber.gcd(bNumber);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {15, 24, 123, 57, -15, 24, 123, 57, -15, 24, 123, 57};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger bNumber = new BigInteger(bSign, bBytes);
    BigInteger result = aNumber.gcd(bNumber);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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    byte rBytes[] = {15, 24, 123, 57, -15, 24, 123, 57, -15, 24, 123, 57};
    BigInteger aNumber = BigInteger.ZERO;
    BigInteger bNumber = new BigInteger(bSign, bBytes);
    BigInteger result = aNumber.gcd(bNumber);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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  public void testGcdBothZeros() {
    byte rBytes[] = {0};
    BigInteger aNumber = new BigInteger("0");
    BigInteger bNumber = BigInteger.valueOf(0L);
    BigInteger result = aNumber.gcd(bNumber);
    byte resBytes[] = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 0, result.signum());
  }

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    byte rBytes[] = {7};
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    BigInteger bNumber = new BigInteger(bSign, bBytes);
    BigInteger result = aNumber.gcd(bNumber);
    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }

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