diff options
Diffstat (limited to 'libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dsa/BCDSAPublicKey.java')
-rw-r--r-- | libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dsa/BCDSAPublicKey.java | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dsa/BCDSAPublicKey.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dsa/BCDSAPublicKey.java new file mode 100644 index 000000000..f4ccaeae0 --- /dev/null +++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/dsa/BCDSAPublicKey.java @@ -0,0 +1,171 @@ +package org.spongycastle.jcajce.provider.asymmetric.dsa; + +import java.io.IOException; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.math.BigInteger; +import java.security.interfaces.DSAParams; +import java.security.interfaces.DSAPublicKey; +import java.security.spec.DSAParameterSpec; +import java.security.spec.DSAPublicKeySpec; + +import org.spongycastle.asn1.ASN1Encodable; +import org.spongycastle.asn1.ASN1Integer; +import org.spongycastle.asn1.DERNull; +import org.spongycastle.asn1.x509.AlgorithmIdentifier; +import org.spongycastle.asn1.x509.DSAParameter; +import org.spongycastle.asn1.x509.SubjectPublicKeyInfo; +import org.spongycastle.asn1.x9.X9ObjectIdentifiers; +import org.spongycastle.crypto.params.DSAPublicKeyParameters; +import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil; + +public class BCDSAPublicKey + implements DSAPublicKey +{ + private static final long serialVersionUID = 1752452449903495175L; + + private BigInteger y; + private transient DSAParams dsaSpec; + + BCDSAPublicKey( + DSAPublicKeySpec spec) + { + this.y = spec.getY(); + this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG()); + } + + BCDSAPublicKey( + DSAPublicKey key) + { + this.y = key.getY(); + this.dsaSpec = key.getParams(); + } + + BCDSAPublicKey( + DSAPublicKeyParameters params) + { + this.y = params.getY(); + this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG()); + } + + BCDSAPublicKey( + BigInteger y, + DSAParameterSpec dsaSpec) + { + this.y = y; + this.dsaSpec = dsaSpec; + } + + public BCDSAPublicKey( + SubjectPublicKeyInfo info) + { + + ASN1Integer derY; + + try + { + derY = (ASN1Integer)info.parsePublicKey(); + } + catch (IOException e) + { + throw new IllegalArgumentException("invalid info structure in DSA public key"); + } + + this.y = derY.getValue(); + + if (isNotNull(info.getAlgorithm().getParameters())) + { + DSAParameter params = DSAParameter.getInstance(info.getAlgorithm().getParameters()); + + this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG()); + } + } + + private boolean isNotNull(ASN1Encodable parameters) + { + return parameters != null && !DERNull.INSTANCE.equals(parameters.toASN1Primitive()); + } + + public String getAlgorithm() + { + return "DSA"; + } + + public String getFormat() + { + return "X.509"; + } + + public byte[] getEncoded() + { + if (dsaSpec == null) + { + return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa), new ASN1Integer(y)); + } + + return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG()).toASN1Primitive()), new ASN1Integer(y)); + } + + public DSAParams getParams() + { + return dsaSpec; + } + + public BigInteger getY() + { + return y; + } + + public String toString() + { + StringBuffer buf = new StringBuffer(); + String nl = System.getProperty("line.separator"); + + buf.append("DSA Public Key").append(nl); + buf.append(" y: ").append(this.getY().toString(16)).append(nl); + + return buf.toString(); + } + + public int hashCode() + { + return this.getY().hashCode() ^ this.getParams().getG().hashCode() + ^ this.getParams().getP().hashCode() ^ this.getParams().getQ().hashCode(); + } + + public boolean equals( + Object o) + { + if (!(o instanceof DSAPublicKey)) + { + return false; + } + + DSAPublicKey other = (DSAPublicKey)o; + + return this.getY().equals(other.getY()) + && this.getParams().getG().equals(other.getParams().getG()) + && this.getParams().getP().equals(other.getParams().getP()) + && this.getParams().getQ().equals(other.getParams().getQ()); + } + + private void readObject( + ObjectInputStream in) + throws IOException, ClassNotFoundException + { + in.defaultReadObject(); + + this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject()); + } + + private void writeObject( + ObjectOutputStream out) + throws IOException + { + out.defaultWriteObject(); + + out.writeObject(dsaSpec.getP()); + out.writeObject(dsaSpec.getQ()); + out.writeObject(dsaSpec.getG()); + } +} |