Example usage for org.bouncycastle.operator.bc BcDigestProvider get

Introduction

In this page you can find the example usage for org.bouncycastle.operator.bc BcDigestProvider get.

Prototype

ExtendedDigest get(AlgorithmIdentifier digestAlgorithmIdentifier) throws OperatorCreationException;

Source Link

Usage

From source file:org.xipki.security.SignerUtil.java

License:Open Source License

static public PSSSigner createPSSRSASigner(final AlgorithmIdentifier sigAlgId, AsymmetricBlockCipher cipher)
        throws OperatorCreationException {
    if (PKCSObjectIdentifiers.id_RSASSA_PSS.equals(sigAlgId.getAlgorithm()) == false) {
        throw new OperatorCreationException(
                "signature algorithm " + sigAlgId.getAlgorithm() + " is not allowed");
    }/*from  w  w  w .  j  av  a2s. co m*/

    BcDigestProvider digestProvider = BcDefaultDigestProvider.INSTANCE;
    AlgorithmIdentifier digAlgId;
    try {
        digAlgId = AlgorithmUtil.extractDigesetAlgorithmIdentifier(sigAlgId);
    } catch (NoSuchAlgorithmException e) {
        throw new OperatorCreationException(e.getMessage(), e);
    }
    Digest dig = digestProvider.get(digAlgId);
    if (cipher == null) {
        cipher = new RSABlindedEngine();
    }

    RSASSAPSSparams param = RSASSAPSSparams.getInstance(sigAlgId.getParameters());

    AlgorithmIdentifier mfgDigAlgId = AlgorithmIdentifier
            .getInstance(param.getMaskGenAlgorithm().getParameters());
    Digest mfgDig = digestProvider.get(mfgDigAlgId);

    int saltSize = param.getSaltLength().intValue();
    int trailerField = param.getTrailerField().intValue();

    return new PSSSigner(cipher, dig, mfgDig, saltSize, getTrailer(trailerField));
}

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