Examples with CipherAlgorithm org.apache.poi.poifs.crypt.CipherAlgorithm used on opensource projects

Example 1 with CipherAlgorithm

use of org.apache.poi.poifs.crypt.CipherAlgorithm in project poi by apache.

the class AgileDecryptor method verifyPassword.

/**
     * instead of a password, it's also possible to decrypt via certificate.
     * Warning: this code is experimental and hasn't been validated
     * 
     * @see <a href="http://social.msdn.microsoft.com/Forums/en-US/cc9092bb-0c82-4b5b-ae21-abf643bdb37c/agile-encryption-with-certificates">Agile encryption with certificates</a>
     *
     * @param keyPair
     * @param x509
     * @return true, when the data can be successfully decrypted with the given private key
     * @throws GeneralSecurityException
     */
public boolean verifyPassword(KeyPair keyPair, X509Certificate x509) throws GeneralSecurityException {
    AgileEncryptionVerifier ver = (AgileEncryptionVerifier) getEncryptionInfo().getVerifier();
    AgileEncryptionHeader header = (AgileEncryptionHeader) getEncryptionInfo().getHeader();
    HashAlgorithm hashAlgo = header.getHashAlgorithm();
    CipherAlgorithm cipherAlgo = header.getCipherAlgorithm();
    int blockSize = header.getBlockSize();
    AgileCertificateEntry ace = null;
    for (AgileCertificateEntry aceEntry : ver.getCertificates()) {
        if (x509.equals(aceEntry.x509)) {
            ace = aceEntry;
            break;
        }
    }
    if (ace == null) {
        return false;
    }
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
    byte[] keyspec = cipher.doFinal(ace.encryptedKey);
    SecretKeySpec secretKey = new SecretKeySpec(keyspec, ver.getCipherAlgorithm().jceId);
    Mac x509Hmac = CryptoFunctions.getMac(hashAlgo);
    x509Hmac.init(secretKey);
    byte[] certVerifier = x509Hmac.doFinal(ace.x509.getEncoded());
    byte[] vec = CryptoFunctions.generateIv(hashAlgo, header.getKeySalt(), kIntegrityKeyBlock, blockSize);
    cipher = getCipher(secretKey, cipherAlgo, header.getChainingMode(), vec, Cipher.DECRYPT_MODE);
    byte[] hmacKey = cipher.doFinal(header.getEncryptedHmacKey());
    hmacKey = getBlock0(hmacKey, hashAlgo.hashSize);
    vec = CryptoFunctions.generateIv(hashAlgo, header.getKeySalt(), kIntegrityValueBlock, blockSize);
    cipher = getCipher(secretKey, cipherAlgo, header.getChainingMode(), vec, Cipher.DECRYPT_MODE);
    byte[] hmacValue = cipher.doFinal(header.getEncryptedHmacValue());
    hmacValue = getBlock0(hmacValue, hashAlgo.hashSize);
    if (Arrays.equals(ace.certVerifier, certVerifier)) {
        setSecretKey(secretKey);
        setIntegrityHmacKey(hmacKey);
        setIntegrityHmacValue(hmacValue);
        return true;
    } else {
        return false;
    }
}

Example 2 with CipherAlgorithm

use of org.apache.poi.poifs.crypt.CipherAlgorithm in project poi by apache.

the class AgileDecryptor method verifyPassword.

/**
     * set decryption password
     */
@Override
public boolean verifyPassword(String password) throws GeneralSecurityException {
    AgileEncryptionVerifier ver = (AgileEncryptionVerifier) getEncryptionInfo().getVerifier();
    AgileEncryptionHeader header = (AgileEncryptionHeader) getEncryptionInfo().getHeader();
    int blockSize = header.getBlockSize();
    byte[] pwHash = hashPassword(password, ver.getHashAlgorithm(), ver.getSalt(), ver.getSpinCount());
    /**
         * encryptedVerifierHashInput: This attribute MUST be generated by using the following steps:
         * 1. Generate a random array of bytes with the number of bytes used specified by the saltSize
         *    attribute.
         * 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
         *    the binary byte array used to create the saltValue attribute, and a blockKey byte array
         *    consisting of the following bytes: 0xfe, 0xa7, 0xd2, 0x76, 0x3b, 0x4b, 0x9e, and 0x79.
         * 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
         *    attribute as an initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
         *    integral multiple of blockSize bytes, pad the array with 0x00 to the next integral multiple of
         *    blockSize bytes.
         * 4. Use base64 to encode the result of step 3.
         */
    byte[] verfierInputEnc = hashInput(ver, pwHash, kVerifierInputBlock, ver.getEncryptedVerifier(), Cipher.DECRYPT_MODE);
    setVerifier(verfierInputEnc);
    MessageDigest hashMD = getMessageDigest(ver.getHashAlgorithm());
    byte[] verifierHash = hashMD.digest(verfierInputEnc);
    /**
         * encryptedVerifierHashValue: This attribute MUST be generated by using the following steps:
         * 1. Obtain the hash value of the random array of bytes generated in step 1 of the steps for
         *    encryptedVerifierHashInput.
         * 2. Generate an encryption key as specified in section 2.3.4.11 by using the user-supplied password,
         *    the binary byte array used to create the saltValue attribute, and a blockKey byte array
         *    consisting of the following bytes: 0xd7, 0xaa, 0x0f, 0x6d, 0x30, 0x61, 0x34, and 0x4e.
         * 3. Encrypt the hash value obtained in step 1 by using the binary form of the saltValue attribute as
         *    an initialization vector as specified in section 2.3.4.12. If hashSize is not an integral multiple of
         *    blockSize bytes, pad the hash value with 0x00 to an integral multiple of blockSize bytes.
         * 4. Use base64 to encode the result of step 3.
         */
    byte[] verifierHashDec = hashInput(ver, pwHash, kHashedVerifierBlock, ver.getEncryptedVerifierHash(), Cipher.DECRYPT_MODE);
    verifierHashDec = getBlock0(verifierHashDec, ver.getHashAlgorithm().hashSize);
    /**
         * encryptedKeyValue: This attribute MUST be generated by using the following steps:
         * 1. Generate a random array of bytes that is the same size as specified by the
         *    Encryptor.KeyData.keyBits attribute of the parent element.
         * 2. Generate an encryption key as specified in section 2.3.4.11, using the user-supplied password,
         *    the binary byte array used to create the saltValue attribute, and a blockKey byte array
         *    consisting of the following bytes: 0x14, 0x6e, 0x0b, 0xe7, 0xab, 0xac, 0xd0, and 0xd6.
         * 3. Encrypt the random array of bytes generated in step 1 by using the binary form of the saltValue
         *    attribute as an initialization vector as specified in section 2.3.4.12. If the array of bytes is not an
         *    integral multiple of blockSize bytes, pad the array with 0x00 to an integral multiple of
         *    blockSize bytes.
         * 4. Use base64 to encode the result of step 3.
         */
    byte[] keyspec = hashInput(ver, pwHash, kCryptoKeyBlock, ver.getEncryptedKey(), Cipher.DECRYPT_MODE);
    keyspec = getBlock0(keyspec, header.getKeySize() / 8);
    SecretKeySpec secretKey = new SecretKeySpec(keyspec, header.getCipherAlgorithm().jceId);
    /**
         * 1. Obtain the intermediate key by decrypting the encryptedKeyValue from a KeyEncryptor
         *    contained within the KeyEncryptors sequence. Use this key for encryption operations in the
         *    remaining steps of this section.
         * 2. Generate a random array of bytes, known as Salt, of the same length as the value of the
         *    KeyData.hashSize attribute.
         * 3. Encrypt the random array of bytes generated in step 2 by using the binary form of the
         *    KeyData.saltValue attribute and a blockKey byte array consisting of the following bytes: 0x5f,
         *    0xb2, 0xad, 0x01, 0x0c, 0xb9, 0xe1, and 0xf6 used to form an initialization vector as specified in
         *    section 2.3.4.12. If the array of bytes is not an integral multiple of blockSize bytes, pad the
         *    array with 0x00 to the next integral multiple of blockSize bytes.
         * 4. Assign the encryptedHmacKey attribute to the base64-encoded form of the result of step 3.
         */
    byte[] vec = CryptoFunctions.generateIv(header.getHashAlgorithm(), header.getKeySalt(), kIntegrityKeyBlock, blockSize);
    CipherAlgorithm cipherAlgo = header.getCipherAlgorithm();
    Cipher cipher = getCipher(secretKey, cipherAlgo, header.getChainingMode(), vec, Cipher.DECRYPT_MODE);
    byte[] hmacKey = cipher.doFinal(header.getEncryptedHmacKey());
    hmacKey = getBlock0(hmacKey, header.getHashAlgorithm().hashSize);
    /**
         * 5. Generate an HMAC, as specified in [RFC2104], of the encrypted form of the data (message),
         *    which the DataIntegrity element will verify by using the Salt generated in step 2 as the key.
         *    Note that the entire EncryptedPackage stream (1), including the StreamSize field, MUST be
         *    used as the message.
         * 6. Encrypt the HMAC as in step 3 by using a blockKey byte array consisting of the following bytes:
         *    0xa0, 0x67, 0x7f, 0x02, 0xb2, 0x2c, 0x84, and 0x33.
         * 7. Assign the encryptedHmacValue attribute to the base64-encoded form of the result of step 6.
         */
    vec = CryptoFunctions.generateIv(header.getHashAlgorithm(), header.getKeySalt(), kIntegrityValueBlock, blockSize);
    cipher = getCipher(secretKey, cipherAlgo, ver.getChainingMode(), vec, Cipher.DECRYPT_MODE);
    byte[] hmacValue = cipher.doFinal(header.getEncryptedHmacValue());
    hmacValue = getBlock0(hmacValue, header.getHashAlgorithm().hashSize);
    if (Arrays.equals(verifierHashDec, verifierHash)) {
        setSecretKey(secretKey);
        setIntegrityHmacKey(hmacKey);
        setIntegrityHmacValue(hmacValue);
        return true;
    } else {
        return false;
    }
}

Example 3 with CipherAlgorithm

use of org.apache.poi.poifs.crypt.CipherAlgorithm in project poi by apache.

the class AgileDecryptor method hashInput.

/* package */
static byte[] hashInput(AgileEncryptionVerifier ver, byte[] pwHash, byte[] blockKey, byte[] inputKey, int cipherMode) {
    CipherAlgorithm cipherAlgo = ver.getCipherAlgorithm();
    ChainingMode chainMode = ver.getChainingMode();
    int keySize = ver.getKeySize() / 8;
    int blockSize = ver.getBlockSize();
    HashAlgorithm hashAlgo = ver.getHashAlgorithm();
    byte[] intermedKey = generateKey(pwHash, hashAlgo, blockKey, keySize);
    SecretKey skey = new SecretKeySpec(intermedKey, cipherAlgo.jceId);
    byte[] iv = generateIv(hashAlgo, ver.getSalt(), null, blockSize);
    Cipher cipher = getCipher(skey, cipherAlgo, chainMode, iv, cipherMode);
    byte[] hashFinal;
    try {
        inputKey = getBlock0(inputKey, getNextBlockSize(inputKey.length, blockSize));
        hashFinal = cipher.doFinal(inputKey);
        return hashFinal;
    } catch (GeneralSecurityException e) {
        throw new EncryptedDocumentException(e);
    }
}