BigInteger plusHalfSquared = result.pow(2).add(result).shiftLeft(2).add(ONE);
      BigInteger x4 = x.shiftLeft(2);
      // sqrt(x) < result + 0.5, so 4 * x < (result + 0.5)^2 * 4
      // (result + 0.5)^2 * 4 = (result^2 + result)*4 + 1
      assertThat(plusHalfSquared).isGreaterThan(x4);
      BigInteger minusHalfSquared = result.pow(2).subtract(result).shiftLeft(2).add(ONE);

    checkBigIntegerConversion(
        "::ffff:ffff:ffff:ffff", BigInteger.ONE.shiftLeft(64).subtract(BigInteger.ONE));
    checkBigIntegerConversion(
        "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
        BigInteger.ONE.shiftLeft(128).subtract(BigInteger.ONE));
  }

  public void testFromIpv4BigIntegerInputTooLarge() {
    IllegalArgumentException expected =

          .add(BigInteger.valueOf(Integer.MAX_VALUE).add(bigI))
          .add(BigInteger.valueOf(Integer.MIN_VALUE).add(bigI))
          .add(BigInteger.ONE.shiftLeft(63).add(bigI))
          .add(BigInteger.ONE.shiftLeft(64).add(bigI));
    }
    TEST_LONGS = testLongsBuilder.build();
    TEST_BIG_INTEGERS = testBigIntegersBuilder.build();
  }

  public void testAsUnsignedAndLongValueAreInverses() {

            257,
            511,
            512,
            513,
            Double.MAX_EXPONENT - 1,
            Double.MAX_EXPONENT,
            Double.MAX_EXPONENT + 1)) {
      BigInteger x = ONE.shiftLeft(exponent);
      bigValues.add(x, x.add(ONE), x.subtract(ONE));
    }
    bigValues.add(new BigInteger("218838949120258359057546633")); // sqrt(2^175) rounded up and
    // down

    static final int[] maxValueMods = new int[Character.MAX_RADIX + 1];
    static final int[] maxSafeDigits = new int[Character.MAX_RADIX + 1];

    static {
      BigInteger overflow = BigInteger.ONE.shiftLeft(64);
      for (int i = Character.MIN_RADIX; i <= Character.MAX_RADIX; i++) {
        maxValueDivs[i] = divide(MAX_VALUE, i);
        maxValueMods[i] = (int) remainder(MAX_VALUE, i);

[aes.BlockSize]byte k2 [aes.BlockSize]byte } func NewCMAC(b *aes.Block) *CMAC { c := &CMAC{b: *b} c.deriveSubkeys() return c } func (c *CMAC) deriveSubkeys() { aes.EncryptBlockInternal(&c.b, c.k1[:], c.k1[:]) msb := shiftLeft(&c.k1) c.k1[len(c.k1)-1] ^= msb * 0b10000111 c.k2 = c.k1 msb = shiftLeft(&c.k2) c.k2[len(c.k2)-1] ^= msb * 0b10000111 } func (c *CMAC) MAC(m []byte) [aes.BlockSize]byte { fips140.RecordApproved() _ = c.b // Hoist the nil check out of the loop. var x [aes.BlockSize]byte if len(m) ==...