Examples with IESCipher org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher used on opensource projects

Example 1 with IESCipher

use of org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher in project xipki by xipki.

the class CmpAgentUtil method decrypt.

private static byte[] decrypt(EncryptedValue ev, PrivateKey decKey) throws XiSecurityException {
    AlgorithmIdentifier keyAlg = ev.getKeyAlg();
    ASN1ObjectIdentifier keyOid = keyAlg.getAlgorithm();
    byte[] symmKey;
    try {
        if (decKey instanceof RSAPrivateKey) {
            Cipher keyCipher;
            if (keyOid.equals(PKCSObjectIdentifiers.id_RSAES_OAEP)) {
                // Currently we only support the default RSAESOAEPparams
                if (keyAlg.getParameters() != null) {
                    RSAESOAEPparams params = RSAESOAEPparams.getInstance(keyAlg.getParameters());
                    ASN1ObjectIdentifier oid = params.getHashAlgorithm().getAlgorithm();
                    if (!oid.equals(RSAESOAEPparams.DEFAULT_HASH_ALGORITHM.getAlgorithm())) {
                        throw new XiSecurityException("unsupported RSAESOAEPparams.HashAlgorithm " + oid.getId());
                    }
                    oid = params.getMaskGenAlgorithm().getAlgorithm();
                    if (!oid.equals(RSAESOAEPparams.DEFAULT_MASK_GEN_FUNCTION.getAlgorithm())) {
                        throw new XiSecurityException("unsupported RSAESOAEPparams.MaskGenAlgorithm " + oid.getId());
                    }
                    oid = params.getPSourceAlgorithm().getAlgorithm();
                    if (!params.getPSourceAlgorithm().equals(RSAESOAEPparams.DEFAULT_P_SOURCE_ALGORITHM)) {
                        throw new XiSecurityException("unsupported RSAESOAEPparams.PSourceAlgorithm " + oid.getId());
                    }
                }
                keyCipher = Cipher.getInstance("RSA/NONE/OAEPPADDING");
            } else if (keyOid.equals(PKCSObjectIdentifiers.rsaEncryption)) {
                keyCipher = Cipher.getInstance("RSA/NONE/PKCS1PADDING");
            } else {
                throw new XiSecurityException("unsupported keyAlg " + keyOid.getId());
            }
            keyCipher.init(Cipher.DECRYPT_MODE, decKey);
            symmKey = keyCipher.doFinal(ev.getEncSymmKey().getOctets());
        } else if (decKey instanceof ECPrivateKey) {
            ASN1Sequence params = ASN1Sequence.getInstance(keyAlg.getParameters());
            final int n = params.size();
            for (int i = 0; i < n; i++) {
                if (!keyOid.equals(ObjectIdentifiers.Secg.id_ecies_specifiedParameters)) {
                    throw new XiSecurityException("unsupported keyAlg " + keyOid.getId());
                }
                ASN1TaggedObject to = (ASN1TaggedObject) params.getObjectAt(i);
                int tag = to.getTagNo();
                if (tag == 0) {
                    // KDF
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (ObjectIdentifiers.Misc.id_iso18033_kdf2.equals(algId.getAlgorithm())) {
                        AlgorithmIdentifier hashAlgorithm = AlgorithmIdentifier.getInstance(algId.getParameters());
                        if (!hashAlgorithm.getAlgorithm().equals(HashAlgo.SHA1.getOid())) {
                            throw new XiSecurityException("unsupported KeyDerivationFunction.HashAlgorithm " + hashAlgorithm.getAlgorithm().getId());
                        }
                    } else {
                        throw new XiSecurityException("unsupported KeyDerivationFunction " + algId.getAlgorithm().getId());
                    }
                } else if (tag == 1) {
                    // SymmetricEncryption
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (!ObjectIdentifiers.Secg.id_aes128_cbc_in_ecies.equals(algId.getAlgorithm())) {
                        throw new XiSecurityException("unsupported SymmetricEncryption " + algId.getAlgorithm().getId());
                    }
                } else if (tag == 2) {
                    // MessageAuthenticationCode
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (ObjectIdentifiers.Secg.id_hmac_full_ecies.equals(algId.getAlgorithm())) {
                        AlgorithmIdentifier hashAlgorithm = AlgorithmIdentifier.getInstance(algId.getParameters());
                        if (!hashAlgorithm.getAlgorithm().equals(HashAlgo.SHA1.getOid())) {
                            throw new XiSecurityException("unsupported MessageAuthenticationCode.HashAlgorithm " + hashAlgorithm.getAlgorithm().getId());
                        }
                    } else {
                        throw new XiSecurityException("unsupported MessageAuthenticationCode " + algId.getAlgorithm().getId());
                    }
                }
            }
            int aesKeySize = 128;
            byte[] iv = new byte[16];
            AlgorithmParameterSpec spec = new IESParameterSpec(null, null, aesKeySize, aesKeySize, iv);
            BlockCipher cbcCipher = new CBCBlockCipher(new AESEngine());
            IESCipher keyCipher = new IESCipher(new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()), new HMac(DigestFactory.createSHA1()), new PaddedBufferedBlockCipher(cbcCipher)), 16);
            // no random is required
            keyCipher.engineInit(Cipher.DECRYPT_MODE, decKey, spec, null);
            byte[] encSymmKey = ev.getEncSymmKey().getOctets();
            /*
         * BouncyCastle expects the input ephemeralPublicKey | symmetricCiphertext | macTag.
         * So we have to convert it from the following ASN.1 structure
        * <pre>
        * ECIES-Ciphertext-Value ::= SEQUENCE {
        *     ephemeralPublicKey ECPoint,
        *     symmetricCiphertext OCTET STRING,
        *     macTag OCTET STRING
        * }
        *
        * ECPoint ::= OCTET STRING
        * </pre>
        */
            ASN1Sequence seq = DERSequence.getInstance(encSymmKey);
            byte[] ephemeralPublicKey = DEROctetString.getInstance(seq.getObjectAt(0)).getOctets();
            byte[] symmetricCiphertext = DEROctetString.getInstance(seq.getObjectAt(1)).getOctets();
            byte[] macTag = DEROctetString.getInstance(seq.getObjectAt(2)).getOctets();
            byte[] bcInput = new byte[ephemeralPublicKey.length + symmetricCiphertext.length + macTag.length];
            System.arraycopy(ephemeralPublicKey, 0, bcInput, 0, ephemeralPublicKey.length);
            int offset = ephemeralPublicKey.length;
            System.arraycopy(symmetricCiphertext, 0, bcInput, offset, symmetricCiphertext.length);
            offset += symmetricCiphertext.length;
            System.arraycopy(macTag, 0, bcInput, offset, macTag.length);
            symmKey = keyCipher.engineDoFinal(bcInput, 0, bcInput.length);
        } else {
            throw new XiSecurityException("unsupported decryption key type " + decKey.getClass().getName());
        }
        AlgorithmIdentifier symmAlg = ev.getSymmAlg();
        ASN1ObjectIdentifier symmAlgOid = symmAlg.getAlgorithm();
        if (!symmAlgOid.equals(NISTObjectIdentifiers.id_aes128_GCM)) {
            // currently we only support AES128-GCM
            throw new XiSecurityException("unsupported symmAlg " + symmAlgOid.getId());
        }
        GCMParameters params = GCMParameters.getInstance(symmAlg.getParameters());
        Cipher dataCipher = Cipher.getInstance(symmAlgOid.getId());
        AlgorithmParameterSpec algParams = new GCMParameterSpec(params.getIcvLen() << 3, params.getNonce());
        dataCipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(symmKey, "AES"), algParams);
        byte[] encValue = ev.getEncValue().getOctets();
        return dataCipher.doFinal(encValue);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException ex) {
        throw new XiSecurityException("Error while decrypting the EncryptedValue", ex);
    }
}

Example 2 with IESCipher

use of org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher in project xipki by xipki.

the class SignatureCmpCaClient method decrypt.

private byte[] decrypt(EncryptedValue ev) throws Exception {
    AlgorithmIdentifier keyAlg = ev.getKeyAlg();
    ASN1ObjectIdentifier keyOid = keyAlg.getAlgorithm();
    byte[] symmKey;
    try {
        if (requestorKey instanceof RSAPrivateKey) {
            Cipher keyCipher;
            if (keyOid.equals(PKCSObjectIdentifiers.id_RSAES_OAEP)) {
                // Currently we only support the default RSAESOAEPparams
                if (keyAlg.getParameters() != null) {
                    RSAESOAEPparams params = RSAESOAEPparams.getInstance(keyAlg.getParameters());
                    ASN1ObjectIdentifier oid = params.getHashAlgorithm().getAlgorithm();
                    if (!oid.equals(RSAESOAEPparams.DEFAULT_HASH_ALGORITHM.getAlgorithm())) {
                        throw new Exception("unsupported RSAESOAEPparams.HashAlgorithm " + oid.getId());
                    }
                    oid = params.getMaskGenAlgorithm().getAlgorithm();
                    if (!oid.equals(RSAESOAEPparams.DEFAULT_MASK_GEN_FUNCTION.getAlgorithm())) {
                        throw new Exception("unsupported RSAESOAEPparams.MaskGenAlgorithm " + oid.getId());
                    }
                    oid = params.getPSourceAlgorithm().getAlgorithm();
                    if (!params.getPSourceAlgorithm().equals(RSAESOAEPparams.DEFAULT_P_SOURCE_ALGORITHM)) {
                        throw new Exception("unsupported RSAESOAEPparams.PSourceAlgorithm " + oid.getId());
                    }
                }
                keyCipher = Cipher.getInstance("RSA/NONE/OAEPPADDING");
            } else if (keyOid.equals(PKCSObjectIdentifiers.rsaEncryption)) {
                keyCipher = Cipher.getInstance("RSA/NONE/PKCS1PADDING");
            } else {
                throw new Exception("unsupported keyAlg " + keyOid.getId());
            }
            keyCipher.init(Cipher.DECRYPT_MODE, requestorKey);
            symmKey = keyCipher.doFinal(ev.getEncSymmKey().getOctets());
        } else if (requestorKey instanceof ECPrivateKey) {
            ASN1Sequence params = ASN1Sequence.getInstance(keyAlg.getParameters());
            final int n = params.size();
            for (int i = 0; i < n; i++) {
                if (!keyOid.equals(ObjectIdentifiers.id_ecies_specifiedParameters)) {
                    throw new Exception("unsupported keyAlg " + keyOid.getId());
                }
                ASN1TaggedObject to = (ASN1TaggedObject) params.getObjectAt(i);
                int tag = to.getTagNo();
                if (tag == 0) {
                    // KDF
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (ObjectIdentifiers.id_iso18033_kdf2.equals(algId.getAlgorithm())) {
                        AlgorithmIdentifier hashAlgorithm = AlgorithmIdentifier.getInstance(algId.getParameters());
                        if (!hashAlgorithm.getAlgorithm().equals(ObjectIdentifiers.id_sha1)) {
                            throw new Exception("unsupported KeyDerivationFunction.HashAlgorithm " + hashAlgorithm.getAlgorithm().getId());
                        }
                    } else {
                        throw new Exception("unsupported KeyDerivationFunction " + algId.getAlgorithm().getId());
                    }
                } else if (tag == 1) {
                    // SymmetricEncryption
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (!ObjectIdentifiers.id_aes128_cbc_in_ecies.equals(algId.getAlgorithm())) {
                        throw new Exception("unsupported SymmetricEncryption " + algId.getAlgorithm().getId());
                    }
                } else if (tag == 2) {
                    // MessageAuthenticationCode
                    AlgorithmIdentifier algId = AlgorithmIdentifier.getInstance(to.getObject());
                    if (ObjectIdentifiers.id_hmac_full_ecies.equals(algId.getAlgorithm())) {
                        AlgorithmIdentifier hashAlgorithm = AlgorithmIdentifier.getInstance(algId.getParameters());
                        if (!hashAlgorithm.getAlgorithm().equals(ObjectIdentifiers.id_sha1)) {
                            throw new Exception("unsupported MessageAuthenticationCode.HashAlgorithm " + hashAlgorithm.getAlgorithm().getId());
                        }
                    } else {
                        throw new Exception("unsupported MessageAuthenticationCode " + algId.getAlgorithm().getId());
                    }
                }
            }
            int aesKeySize = 128;
            byte[] iv = new byte[16];
            AlgorithmParameterSpec spec = new IESParameterSpec(null, null, aesKeySize, aesKeySize, iv);
            BlockCipher cbcCipher = new CBCBlockCipher(new AESEngine());
            IESCipher keyCipher = new IESCipher(new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(DigestFactory.createSHA1()), new HMac(DigestFactory.createSHA1()), new PaddedBufferedBlockCipher(cbcCipher)), 16);
            // no random is required
            keyCipher.engineInit(Cipher.DECRYPT_MODE, requestorKey, spec, null);
            byte[] encSymmKey = ev.getEncSymmKey().getOctets();
            /*
         * BouncyCastle expects the input ephemeralPublicKey | symmetricCiphertext | macTag.
         * So we have to convert it from the following ASN.1 structure
        * <pre>
        * ECIES-Ciphertext-Value ::= SEQUENCE {
        *     ephemeralPublicKey ECPoint,
        *     symmetricCiphertext OCTET STRING,
        *     macTag OCTET STRING
        * }
        *
        * ECPoint ::= OCTET STRING
        * </pre>
        */
            ASN1Sequence seq = DERSequence.getInstance(encSymmKey);
            byte[] ephemeralPublicKey = DEROctetString.getInstance(seq.getObjectAt(0)).getOctets();
            byte[] symmetricCiphertext = DEROctetString.getInstance(seq.getObjectAt(1)).getOctets();
            byte[] macTag = DEROctetString.getInstance(seq.getObjectAt(2)).getOctets();
            byte[] bcInput = new byte[ephemeralPublicKey.length + symmetricCiphertext.length + macTag.length];
            System.arraycopy(ephemeralPublicKey, 0, bcInput, 0, ephemeralPublicKey.length);
            int offset = ephemeralPublicKey.length;
            System.arraycopy(symmetricCiphertext, 0, bcInput, offset, symmetricCiphertext.length);
            offset += symmetricCiphertext.length;
            System.arraycopy(macTag, 0, bcInput, offset, macTag.length);
            symmKey = keyCipher.engineDoFinal(bcInput, 0, bcInput.length);
        } else {
            throw new Exception("unsupported decryption key type " + requestorKey.getClass().getName());
        }
        AlgorithmIdentifier symmAlg = ev.getSymmAlg();
        if (!symmAlg.getAlgorithm().equals(NISTObjectIdentifiers.id_aes128_GCM)) {
            // currently we only support AES128-GCM
            throw new Exception("unsupported symmAlg " + symmAlg.getAlgorithm().getId());
        }
        Cipher dataCipher = Cipher.getInstance(NISTObjectIdentifiers.id_aes128_GCM.getId());
        GCMParameters gcmParams = GCMParameters.getInstance(symmAlg.getParameters());
        GCMParameterSpec spec = new GCMParameterSpec(gcmParams.getIcvLen() * 8, gcmParams.getNonce());
        dataCipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(symmKey, "AES"), spec);
        byte[] encValue = ev.getEncValue().getOctets();
        return dataCipher.doFinal(encValue);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException ex) {
        throw new Exception("Error while decrypting the EncryptedValue", ex);
    }
}