コード例 #1
0
  public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
    this.forEncryption = forEncryption;

    CipherParameters cipherParameters;
    if (params instanceof AEADParameters) {
      AEADParameters param = (AEADParameters) params;

      nonce = param.getNonce();
      initialAssociatedText = param.getAssociatedText();
      macSize = param.getMacSize() / 8;
      cipherParameters = param.getKey();
    } else if (params instanceof ParametersWithIV) {
      ParametersWithIV param = (ParametersWithIV) params;

      nonce = param.getIV();
      initialAssociatedText = null;
      macSize = macBlock.length / 2;
      cipherParameters = param.getParameters();
    } else {
      throw new IllegalArgumentException("invalid parameters passed to CCM");
    }

    // NOTE: Very basic support for key re-use, but no performance gain from it
    if (cipherParameters != null) {
      keyParam = cipherParameters;
    }

    if (nonce == null || nonce.length < 7 || nonce.length > 13) {
      throw new IllegalArgumentException("nonce must have length from 7 to 13 octets");
    }

    reset();
  }
コード例 #2
0
 protected byte[] engineGetIV() {
   return (ivParam != null) ? ivParam.getIV() : null;
 }