Exemple #1
0
 /**
  * Creates a new {@code HKDF} instance.
  *
  * @param algorithm the MAC algorithm to use.
  * @param info optional context and application specific information, may be {@code null} or
  *     empty.
  * @param dkLen the desired length for derived keys, in bytes.
  * @throws NullPointerException if {@code algorithm} is {@code null}.
  * @throws IllegalArgumentException if {@code dkLen} is negative, or if the MAC algorithm is
  *     unknown, or if {@code dkLen} is greater than 255 * MAC algorithm's output length.
  */
 HKDF(Algorithm<MAC> algorithm, byte[] info, int dkLen) {
   Parameters.checkCondition(dkLen > 0);
   MAC mac = Factory.newMAC(algorithm, new byte[0]);
   Parameters.checkCondition(dkLen <= 255 * mac.length());
   this.algorithm = algorithm;
   this.dkLen = dkLen;
   this.info = info == null ? new byte[0] : XArrays.copyOf(info);
 }
Exemple #2
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 @Override
 public long skip(long n) {
   Parameters.checkCondition(n >= 0);
   if (finished()) {
     return 0;
   }
   long skipped = n;
   if (n > in.length() - index) {
     skipped = in.length() - index;
   }
   index += skipped;
   return skipped;
 }
Exemple #3
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 /**
  * Marks the current position in the stream. Subsequent calls to reset() will reposition the
  * stream to this point.
  *
  * @param readLimit limit on the number of characters that may be read while still preserving the
  *     mark. Because the stream's input comes from {@code String}s, there is no actual limit, so
  *     this argument must not be negative, but is otherwise ignored.
  * @throws IllegalArgumentException if {@code readLimit} is negative.
  */
 @Override
 public void mark(int readLimit) {
   Parameters.checkCondition(readLimit >= 0);
   mark = index;
 }