// desfire_crypto.h
-void *mifare_cryto_preprocess_data (desfiretag_t tag, void *data, size_t *nbytes, off_t offset, int communication_settings);
-void *mifare_cryto_postprocess_data (desfiretag_t tag, void *data, ssize_t *nbytes, int communication_settings);
+void *mifare_cryto_preprocess_data (desfiretag_t tag, void *data, size_t *nbytes, size_t offset, int communication_settings);
+void *mifare_cryto_postprocess_data (desfiretag_t tag, void *data, size_t *nbytes, int communication_settings);
void mifare_cypher_single_block (desfirekey_t key, uint8_t *data, uint8_t *ivect, MifareCryptoDirection direction, MifareCryptoOperation operation, size_t block_size);
void mifare_cypher_blocks_chained (desfiretag_t tag, desfirekey_t key, uint8_t *ivect, uint8_t *data, size_t data_size, MifareCryptoDirection direction, MifareCryptoOperation operation);
size_t key_block_size (const desfirekey_t key);