411 kernel crypto

gistfile1.c

if (write){
                if(key_size != 0){
                        for (k = 0; k < nbytes; k+=
                                                crypto_cipher_blocksize(tfm)) {
                                crypto_cipher_encrypt_one(tfm, dev->data+
                                                        offset+k, buffer+k);
                        }
                }else{
                        memcpy(dev->data + offset, buffer, nbytes);
                }
        }else{
                if(key_size != 0){
                        for (k = 0; k < nbytes; k+=
                                                crypto_cipher_blocksize(tfm)) {
                                crypto_cipher_decrypt_one(tfm, buffer+k,
                                                        dev->data+offset+k);
                        }
                }else{
                        memcpy(buffer, dev->data + offset, nbytes);
                }
        }