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X509SignatureUtil.javaAPI DocAndroid 1.5 API4791Wed May 06 22:41:06 BST 2009org.bouncycastle.jce.provider

X509SignatureUtil

public class X509SignatureUtil extends Object

Fields Summary
private static final org.bouncycastle.asn1.ASN1Null
derNull
Constructors Summary
Methods Summary
private static java.lang.StringgetDigestAlgName(org.bouncycastle.asn1.DERObjectIdentifier digestAlgOID)
Return the digest algorithm using one of the standard JCA string representations rather the the algorithm identifier (if possible).

        if (PKCSObjectIdentifiers.md5.equals(digestAlgOID))
        {
            return "MD5";
        }
        else if (OIWObjectIdentifiers.idSHA1.equals(digestAlgOID))
        {
            return "SHA1";
        }
        else if (NISTObjectIdentifiers.id_sha224.equals(digestAlgOID))
        {
            return "SHA224";
        }
        else if (NISTObjectIdentifiers.id_sha256.equals(digestAlgOID))
        {
            return "SHA256";
        }
        else if (NISTObjectIdentifiers.id_sha384.equals(digestAlgOID))
        {
            return "SHA384";
        }
        else if (NISTObjectIdentifiers.id_sha512.equals(digestAlgOID))
        {
            return "SHA512";
        }
        else if (TeleTrusTObjectIdentifiers.ripemd128.equals(digestAlgOID))
        {
            return "RIPEMD128";
        }
        else if (TeleTrusTObjectIdentifiers.ripemd160.equals(digestAlgOID))
        {
            return "RIPEMD160";
        }
        else if (TeleTrusTObjectIdentifiers.ripemd256.equals(digestAlgOID))
        {
            return "RIPEMD256";
        }
        else if (CryptoProObjectIdentifiers.gostR3411.equals(digestAlgOID))
        {
            return "GOST3411";
        }
        else
        {
            return digestAlgOID.getId();            
        }
static java.lang.StringgetSignatureName(org.bouncycastle.asn1.x509.AlgorithmIdentifier sigAlgId)

        DEREncodable params = sigAlgId.getParameters();
        
        if (params != null && !derNull.equals(params))
        {
            if (sigAlgId.getObjectId().equals(PKCSObjectIdentifiers.id_RSASSA_PSS))
            {
                RSASSAPSSparams rsaParams = RSASSAPSSparams.getInstance(params);
                
                return getDigestAlgName(rsaParams.getHashAlgorithm().getObjectId()) + "withRSAandMGF1";
            }
            if (sigAlgId.getObjectId().equals(X9ObjectIdentifiers.ecdsa_with_SHA2))
            {
                ASN1Sequence ecDsaParams = ASN1Sequence.getInstance(params);
                
                return getDigestAlgName((DERObjectIdentifier)ecDsaParams.getObjectAt(0)) + "withECDSA";
            }
        }

        return sigAlgId.getObjectId().getId();
static voidsetSignatureParameters(java.security.Signature signature, org.bouncycastle.asn1.DEREncodable params)

    // END android-changed
    
      
         
          
           
    
        if (params != null && !derNull.equals(params))
        {
            AlgorithmParameters  sigParams = AlgorithmParameters.getInstance(signature.getAlgorithm(), signature.getProvider());
            
            try
            {
                sigParams.init(params.getDERObject().getDEREncoded());
            }
            catch (IOException e)
            {
                throw new SignatureException("IOException decoding parameters: " + e.getMessage());
            }
            
            if (signature.getAlgorithm().endsWith("MGF1"))
            {
                try
                {
                    signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
                }
                catch (GeneralSecurityException e)
                {
                    throw new SignatureException("Exception extracting parameters: " + e.getMessage());
                }
            }
        }