diff options
Diffstat (limited to 'libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/JcePBESecretKeyDecryptorBuilder.java')
-rw-r--r-- | libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/JcePBESecretKeyDecryptorBuilder.java | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/JcePBESecretKeyDecryptorBuilder.java b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/JcePBESecretKeyDecryptorBuilder.java new file mode 100644 index 000000000..e62e4674e --- /dev/null +++ b/libraries/spongycastle/pg/src/main/java/org/spongycastle/openpgp/operator/jcajce/JcePBESecretKeyDecryptorBuilder.java @@ -0,0 +1,100 @@ +package org.spongycastle.openpgp.operator.jcajce; + +import java.security.InvalidAlgorithmParameterException; +import java.security.InvalidKeyException; +import java.security.Provider; + +import javax.crypto.BadPaddingException; +import javax.crypto.Cipher; +import javax.crypto.IllegalBlockSizeException; +import javax.crypto.spec.IvParameterSpec; + +import org.spongycastle.jcajce.DefaultJcaJceHelper; +import org.spongycastle.jcajce.NamedJcaJceHelper; +import org.spongycastle.jcajce.ProviderJcaJceHelper; +import org.spongycastle.openpgp.PGPException; +import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor; +import org.spongycastle.openpgp.operator.PGPDigestCalculatorProvider; + +public class JcePBESecretKeyDecryptorBuilder +{ + private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper()); + private PGPDigestCalculatorProvider calculatorProvider; + + private JcaPGPDigestCalculatorProviderBuilder calculatorProviderBuilder; + + public JcePBESecretKeyDecryptorBuilder() + { + this.calculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder(); + } + + public JcePBESecretKeyDecryptorBuilder(PGPDigestCalculatorProvider calculatorProvider) + { + this.calculatorProvider = calculatorProvider; + } + + public JcePBESecretKeyDecryptorBuilder setProvider(Provider provider) + { + this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider)); + + if (calculatorProviderBuilder != null) + { + calculatorProviderBuilder.setProvider(provider); + } + + return this; + } + + public JcePBESecretKeyDecryptorBuilder setProvider(String providerName) + { + this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName)); + + if (calculatorProviderBuilder != null) + { + calculatorProviderBuilder.setProvider(providerName); + } + + return this; + } + + public PBESecretKeyDecryptor build(char[] passPhrase) + throws PGPException + { + if (calculatorProvider == null) + { + calculatorProvider = calculatorProviderBuilder.build(); + } + + return new PBESecretKeyDecryptor(passPhrase, calculatorProvider) + { + public byte[] recoverKeyData(int encAlgorithm, byte[] key, byte[] iv, byte[] keyData, int keyOff, int keyLen) + throws PGPException + { + try + { + Cipher c = helper.createCipher(PGPUtil.getSymmetricCipherName(encAlgorithm) + "/CFB/NoPadding"); + + c.init(Cipher.DECRYPT_MODE, PGPUtil.makeSymmetricKey(encAlgorithm, key), new IvParameterSpec(iv)); + + return c.doFinal(keyData, keyOff, keyLen); + } + catch (IllegalBlockSizeException e) + { + throw new PGPException("illegal block size: " + e.getMessage(), e); + } + catch (BadPaddingException e) + { + throw new PGPException("bad padding: " + e.getMessage(), e); + } + catch (InvalidAlgorithmParameterException e) + { + throw new PGPException("invalid parameter: " + e.getMessage(), e); + } + catch (InvalidKeyException e) + { + throw new PGPException("invalid key: " + e.getMessage(), e); + } + } + }; + } +} |