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95
pg/src/main/jdk1.1/org/bouncycastle/openpgp/operator/jcajce/JcaJcePGPUtil.java
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| @@ -0,0 +1,95 @@ | ||
| package org.bouncycastle.openpgp.operator.jcajce; | ||
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| import java.io.IOException; | ||
| import java.math.BigInteger; | ||
| import java.security.GeneralSecurityException; | ||
| import java.security.InvalidKeyException; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.security.Key; | ||
| import java.security.PublicKey; | ||
| import java.security.spec.AlgorithmParameterSpec; | ||
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| import javax.crypto.KeyAgreement; | ||
| import javax.crypto.SecretKey; | ||
| import javax.crypto.spec.SecretKeySpec; | ||
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| import org.bouncycastle.asn1.ASN1ObjectIdentifier; | ||
| import org.bouncycastle.asn1.x9.ECNamedCurveTable; | ||
| import org.bouncycastle.asn1.x9.X9ECParameters; | ||
| import org.bouncycastle.bcpg.PublicKeyPacket; | ||
| import org.bouncycastle.crypto.ec.CustomNamedCurves; | ||
| import org.bouncycastle.jcajce.spec.HybridValueParameterSpec; | ||
| import org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec; | ||
| import org.bouncycastle.math.ec.ECCurve; | ||
| import org.bouncycastle.math.ec.ECPoint; | ||
| import org.bouncycastle.openpgp.PGPException; | ||
| import org.bouncycastle.util.Arrays; | ||
| import org.bouncycastle.util.BigIntegers; | ||
| import org.bouncycastle.util.Strings; | ||
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| /** | ||
| * Basic utility class | ||
| */ | ||
| class JcaJcePGPUtil | ||
| { | ||
| public static SecretKey makeSymmetricKey( | ||
| int algorithm, | ||
| byte[] keyBytes) | ||
| throws PGPException | ||
| { | ||
| String algName = org.bouncycastle.openpgp.PGPUtil.getSymmetricCipherName(algorithm); | ||
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|
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| if (algName == null) | ||
| { | ||
| throw new PGPException("unknown symmetric algorithm: " + algorithm); | ||
| } | ||
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| return new SecretKeySpec(keyBytes, algName); | ||
| } | ||
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| static ECPoint decodePoint( | ||
| BigInteger encodedPoint, | ||
| ECCurve curve) | ||
| throws IOException | ||
| { | ||
| return curve.decodePoint(BigIntegers.asUnsignedByteArray(encodedPoint)); | ||
| } | ||
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| static X9ECParameters getX9Parameters(ASN1ObjectIdentifier curveOID) | ||
| { | ||
| X9ECParameters x9Params = CustomNamedCurves.getByOID(curveOID); | ||
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| if (x9Params == null) | ||
| { | ||
| return ECNamedCurveTable.getByOID(curveOID); | ||
| } | ||
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| return x9Params; | ||
| } | ||
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| static HybridValueParameterSpec getHybridValueParameterSpecWithPrepend(byte[] ephmeralPublicKey, PublicKeyPacket pkp, String algorithmName) | ||
| throws IOException | ||
| { | ||
| return new HybridValueParameterSpec(Arrays.concatenate(ephmeralPublicKey, pkp.getEncoded()), true, new UserKeyingMaterialSpec(Strings.toByteArray("OpenPGP " + algorithmName))); | ||
| } | ||
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| static Key getSecret(OperatorHelper helper, PublicKey cryptoPublicKey, String keyEncryptionOID, String agreementName, AlgorithmParameterSpec ukmSpec, Key privKey) | ||
| throws GeneralSecurityException | ||
| { | ||
| try | ||
| { | ||
| KeyAgreement agreement = helper.createKeyAgreement(agreementName); | ||
| agreement.init(privKey, ukmSpec); | ||
| agreement.doPhase(cryptoPublicKey, true); | ||
| return agreement.generateSecret(keyEncryptionOID); | ||
| } | ||
| catch (InvalidKeyException e) | ||
| { | ||
| throw new GeneralSecurityException(e.toString()); | ||
| } | ||
| catch (NoSuchAlgorithmException e) | ||
| { | ||
| throw new GeneralSecurityException(e.toString()); | ||
| } | ||
| } | ||
| } |
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