diff options
Diffstat (limited to 'pg/src/main/jdk1.1/org/spongycastle/openpgp/operator/jcajce/OperatorHelper.java')
| -rw-r--r-- | pg/src/main/jdk1.1/org/spongycastle/openpgp/operator/jcajce/OperatorHelper.java | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/pg/src/main/jdk1.1/org/spongycastle/openpgp/operator/jcajce/OperatorHelper.java b/pg/src/main/jdk1.1/org/spongycastle/openpgp/operator/jcajce/OperatorHelper.java new file mode 100644 index 00000000..dc20e0c3 --- /dev/null +++ b/pg/src/main/jdk1.1/org/spongycastle/openpgp/operator/jcajce/OperatorHelper.java @@ -0,0 +1,220 @@ +package org.spongycastle.openpgp.operator.jcajce; + +import java.io.InputStream; +import java.security.GeneralSecurityException; +import java.security.NoSuchAlgorithmException; +import java.security.NoSuchProviderException; +import java.security.KeyFactory; +import java.security.MessageDigest; +import java.security.Signature; + +import javax.crypto.Cipher; +import javax.crypto.CipherInputStream; +import javax.crypto.SecretKey; +import javax.crypto.spec.IvParameterSpec; +import javax.crypto.spec.SecretKeySpec; + +import org.spongycastle.bcpg.PublicKeyAlgorithmTags; +import org.spongycastle.bcpg.SymmetricKeyAlgorithmTags; +import org.spongycastle.jcajce.util.JcaJceHelper; +import org.spongycastle.openpgp.PGPException; +import org.spongycastle.openpgp.PGPPublicKey; +import org.spongycastle.openpgp.operator.PGPDataDecryptor; +import org.spongycastle.openpgp.operator.PGPDigestCalculator; + +class OperatorHelper +{ + private JcaJceHelper helper; + + OperatorHelper(JcaJceHelper helper) + { + this.helper = helper; + } + + MessageDigest createDigest(int algorithm) + throws GeneralSecurityException, PGPException + { + MessageDigest dig; + + try + { + dig = helper.createDigest(PGPUtil.getDigestName(algorithm)); + } + catch (NoSuchAlgorithmException e) + { + throw new PGPException("cannot find provider: " + e.getMessage(), e); + } + catch (NoSuchProviderException e) + { + throw new PGPException("cannot find provider: " + e.getMessage(), e); + } + + return dig; + } + + KeyFactory createKeyFactory(String algorithm) + throws GeneralSecurityException, PGPException + { + try + { + return helper.createKeyFactory(algorithm); + } + catch (NoSuchAlgorithmException e) + { + throw new PGPException("cannot find provider: " + e.getMessage(), e); + } + catch (NoSuchProviderException e) + { + throw new PGPException("cannot find provider: " + e.getMessage(), e); + } + } + + PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key) + throws PGPException + { + try + { + SecretKey secretKey = new SecretKeySpec(key, PGPUtil.getSymmetricCipherName(encAlgorithm)); + + final Cipher c = createStreamCipher(encAlgorithm, withIntegrityPacket); + + byte[] iv = new byte[c.getBlockSize()]; + + c.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iv)); + + return new PGPDataDecryptor() + { + public InputStream getInputStream(InputStream in) + { + return new CipherInputStream(in, c); + } + + public int getBlockSize() + { + return c.getBlockSize(); + } + + public PGPDigestCalculator getIntegrityCalculator() + { + return new SHA1PGPDigestCalculator(); + } + }; + } + catch (PGPException e) + { + throw e; + } + catch (Exception e) + { + throw new PGPException("Exception creating cipher", e); + } + } + + Cipher createStreamCipher(int encAlgorithm, boolean withIntegrityPacket) + throws PGPException + { + String mode = (withIntegrityPacket) + ? "CFB" + : "OpenPGPCFB"; + + String cName = PGPUtil.getSymmetricCipherName(encAlgorithm) + + "/" + mode + "/NoPadding"; + + return createCipher(cName); + } + + Cipher createCipher(String cipherName) + throws PGPException + { + try + { + return helper.createCipher(cipherName); + } + catch (Exception e) + { + throw new PGPException("cannot create cipher: " + e.getMessage(), e); + } + } + + Cipher createPublicKeyCipher(int encAlgorithm) + throws PGPException + { + switch (encAlgorithm) + { + case PGPPublicKey.RSA_ENCRYPT: + case PGPPublicKey.RSA_GENERAL: + return createCipher("RSA/ECB/PKCS1Padding"); + case PGPPublicKey.ELGAMAL_ENCRYPT: + case PGPPublicKey.ELGAMAL_GENERAL: + return createCipher("ElGamal/ECB/PKCS1Padding"); + case PGPPublicKey.DSA: + throw new PGPException("Can't use DSA for encryption."); + case PGPPublicKey.ECDSA: + throw new PGPException("Can't use ECDSA for encryption."); + default: + throw new PGPException("unknown asymmetric algorithm: " + encAlgorithm); + } + } + + Cipher createKeyWrapper(int encAlgorithm) + throws PGPException + { + try + { + switch (encAlgorithm) + { + case SymmetricKeyAlgorithmTags.AES_128: + case SymmetricKeyAlgorithmTags.AES_192: + case SymmetricKeyAlgorithmTags.AES_256: + return helper.createCipher("AESWrap"); + default: + throw new PGPException("unknown wrap algorithm: " + encAlgorithm); + } + } + catch (Exception e) + { + throw new PGPException("cannot create cipher: " + e.getMessage(), e); + } + } + + private Signature createSignature(String cipherName) + throws PGPException + { + try + { + return helper.createSignature(cipherName); + } + catch (Exception e) + { + throw new PGPException("cannot create signature: " + e.getMessage(), e); + } + } + + public Signature createSignature(int keyAlgorithm, int hashAlgorithm) + throws PGPException + { + String encAlg; + + switch (keyAlgorithm) + { + case PublicKeyAlgorithmTags.RSA_GENERAL: + case PublicKeyAlgorithmTags.RSA_SIGN: + encAlg = "RSA"; + break; + case PublicKeyAlgorithmTags.DSA: + encAlg = "DSA"; + break; + case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: // in some malformed cases. + case PublicKeyAlgorithmTags.ELGAMAL_GENERAL: + encAlg = "ElGamal"; + break; + case PublicKeyAlgorithmTags.ECDSA: + encAlg = "ECDSA"; + break; + default: + throw new PGPException("unknown algorithm tag in signature:" + keyAlgorithm); + } + + return createSignature(PGPUtil.getDigestName(hashAlgorithm) + "with" + encAlg); + } +} |