| package org.bouncycastle.jcajce.util; |
| |
| import java.io.IOException; |
| import java.security.AlgorithmParameters; |
| |
| import org.bouncycastle.asn1.ASN1Encodable; |
| import org.bouncycastle.asn1.ASN1Primitive; |
| |
| /** |
| * General JCA/JCE utility methods. |
| */ |
| public class AlgorithmParametersUtils |
| { |
| |
| |
| private AlgorithmParametersUtils() |
| { |
| |
| } |
| |
| /** |
| * Extract an ASN.1 encodable from an AlgorithmParameters object. |
| * |
| * @param params the object to get the encoding used to create the return value. |
| * @return an ASN.1 object representing the primitives making up the params parameter. |
| * @throws IOException if an encoding cannot be extracted. |
| */ |
| public static ASN1Encodable extractParameters(AlgorithmParameters params) |
| throws IOException |
| { |
| // we try ASN.1 explicitly first just in case and then role back to the default. |
| ASN1Encodable asn1Params; |
| try |
| { |
| asn1Params = ASN1Primitive.fromByteArray(params.getEncoded("ASN.1")); |
| } |
| catch (Exception ex) |
| { |
| asn1Params = ASN1Primitive.fromByteArray(params.getEncoded()); |
| } |
| |
| return asn1Params; |
| } |
| |
| /** |
| * Load an AlgorithmParameters object with the passed in ASN.1 encodable - if possible. |
| * |
| * @param params the AlgorithmParameters object to be initialised. |
| * @param sParams the ASN.1 encodable to initialise params with. |
| * @throws IOException if the parameters cannot be initialised. |
| */ |
| public static void loadParameters(AlgorithmParameters params, ASN1Encodable sParams) |
| throws IOException |
| { |
| // we try ASN.1 explicitly first just in case and then role back to the default. |
| try |
| { |
| params.init(sParams.toASN1Primitive().getEncoded(), "ASN.1"); |
| } |
| catch (Exception ex) |
| { |
| params.init(sParams.toASN1Primitive().getEncoded()); |
| } |
| } |
| } |