PKCS5 padding with AES

I use AES encryption, including the huaes.h header. Operating mode is BCE. Encryption and decryption on the device works very well. But I want to send the data encypted to a server using a PKCS5 padding.

How can I configure PKCS5 padding?

Because the API does not provide a way to do this I did it manually.

For everyone else stumble on this issue, I want to share my code that adds the padding. All the code is removed.

QByteArray Cipher::encrypt(QByteArray & plaintext) {
    int moduloBlockSize = plaintext.length() % SB_AES_128_BLOCK_BYTES;
    int plainTextBlockLength = 0;
    if (moduloBlockSize != 0) {
        int nBlockBytes = plaintext.length() / SB_AES_128_BLOCK_BYTES;
        int plaintextBlockBytes = nBlockBytes * SB_AES_128_BLOCK_BYTES;
        plainTextBlockLength = plaintextBlockBytes + SB_AES_128_BLOCK_BYTES;
    } else {
        plainTextBlockLength = plaintext.length() + SB_AES_128_BLOCK_BYTES;
    }
    unsigned char nPaddingBytes = SB_AES_128_BLOCK_BYTES - moduloBlockSize;
    QByteArray plaintextPaddingQByteArray = QByteArray(nPaddingBytes, nPaddingBytes);
    plaintext.append(plaintextPaddingQByteArray);
}

Most of the other cryptographic libraries such as crypto ++ key the default text. Or at least they provide a method to do this.

So I don't really understand why such a common feature is missing in the native API. Perhaps, this should be included in the incident handler?

Tags: BlackBerry Developers

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