Examples with KuznechikFastEngine im.actor.runtime.crypto.primitives.kuznechik.KuznechikFastEngine used on opensource projects

Example 1 with KuznechikFastEngine

use of im.actor.runtime.crypto.primitives.kuznechik.KuznechikFastEngine in project actor-platform by actorapp.

the class ActorBox method openBox.

/**
     * Opening Encrypted box
     *
     * @param header     plain-text header of a box
     * @param cipherText encrypted content
     * @param key        Box key
     * @return plain-text content
     * @throws IntegrityException
     */
public static byte[] openBox(byte[] header, byte[] cipherText, ActorBoxKey key) throws IntegrityException {
    CBCHmacBox aesCipher = new CBCHmacBox(Crypto.createAES128(key.getKeyAES()), Crypto.createSHA256(), key.getMacAES());
    CBCHmacBox kuzCipher = new CBCHmacBox(new KuznechikFastEngine(key.getKeyKuz()), new Streebog256(), key.getMacKuz());
    byte[] kuzPackage = aesCipher.decryptPackage(header, ByteStrings.substring(cipherText, 0, 16), ByteStrings.substring(cipherText, 16, cipherText.length - 16));
    byte[] plainText = kuzCipher.decryptPackage(header, ByteStrings.substring(kuzPackage, 0, 16), ByteStrings.substring(kuzPackage, 16, kuzPackage.length - 16));
    // Validating padding
    int paddingSize = plainText[plainText.length - 1] & 0xFF;
    if (paddingSize < 0 || paddingSize >= 16) {
        throw new IntegrityException("Incorrect padding!");
    }
    PKCS7Padding padding = new PKCS7Padding();
    if (!padding.validate(plainText, plainText.length - 1 - paddingSize, paddingSize)) {
        throw new IntegrityException("Padding does not isMatch!");
    }
    return ByteStrings.substring(plainText, 0, plainText.length - 1 - paddingSize);
}

Example 2 with KuznechikFastEngine

use of im.actor.runtime.crypto.primitives.kuznechik.KuznechikFastEngine in project actor-platform by actorapp.

the class ActorBox method closeBox.

/**
     * Closing encrypted box
     *
     * @param header    plain-text header of a box
     * @param plainText plain-text content
     * @param random32  32 random bytes
     * @param key       Box key
     * @return encrypted context
     * @throws IntegrityException
     */
public static byte[] closeBox(byte[] header, byte[] plainText, byte[] random32, ActorBoxKey key) throws IntegrityException {
    CBCHmacBox aesCipher = new CBCHmacBox(Crypto.createAES128(key.getKeyAES()), Crypto.createSHA256(), key.getMacAES());
    CBCHmacBox kuzCipher = new CBCHmacBox(new KuznechikFastEngine(key.getKeyKuz()), new Streebog256(), key.getMacKuz());
    // Calculating padding
    int paddingSize = (plainText.length + 1) % 16;
    byte[] paddedPlainText = new byte[plainText.length + 1 + paddingSize];
    ByteStrings.write(paddedPlainText, 0, plainText, 0, plainText.length);
    paddedPlainText[paddedPlainText.length - 1] = (byte) paddingSize;
    PKCS7Padding padding = new PKCS7Padding();
    padding.padding(paddedPlainText, plainText.length, paddingSize);
    byte[] kuzIv = ByteStrings.substring(random32, 0, 16);
    byte[] aesIv = ByteStrings.substring(random32, 16, 16);
    byte[] kuzPackage = ByteStrings.merge(kuzIv, kuzCipher.encryptPackage(header, kuzIv, paddedPlainText));
    return ByteStrings.merge(aesIv, aesCipher.encryptPackage(header, aesIv, kuzPackage));
}