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read/write chunks in short length SM APDUs

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This commit is contained in:
Frank Morgner
2013-08-07 21:43:46 +02:00
parent 7e6b7cd4f6
commit 37daaf1192
2 changed files with 16 additions and 7 deletions
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14
npa/src/npa/iso-sm.h
View File

@@ -30,6 +30,20 @@
extern "C" {
#endif
/** @brief maximum length of response when targeting a SM RAPDU
*
* Using SM with authenticated data+le and encrypted data this is the biggest
* amount of the unencrypted response data we can receive. We assume AES block
* length for padding and MAC. */
#define MAX_SM_APDU_RESP_SIZE 223
/** @brief maximum length of data when targeting a SM APDU
*
* Using SM with authenticated data+header and encrypted data this is the
* biggest amount of the unencrypted data we can send. We assume AES block
* length for padding and MAC. */
#define MAX_SM_APDU_DATA_SIZE 239
/** @brief Padding indicator: use ISO/IEC 9797-1 padding method 2 */
#define SM_ISO_PADDING 0x01
/** @brief Padding indicator: use no padding */

9
npa/src/scutil.c
View File

@@ -148,16 +148,13 @@ int print_avail(int verbose)
return r;
}
#define maxresp SC_MAX_APDU_BUFFER_SIZE - 2
#define ISO_READ_BINARY 0xB0
#define ISO_P1_FLAG_SFID 0x80
int read_binary_rec(sc_card_t *card, unsigned char sfid,
u8 **ef, size_t *ef_len)
{
int r;
/* we read less bytes than possible. this is a workaround for acr 122,
* which only supports apdus of max 250 bytes */
size_t read = maxresp - 8;
size_t read = MAX_SM_APDU_RESP_SIZE;
sc_apdu_t apdu;
u8 *p;
@@ -222,9 +219,7 @@ int write_binary_rec(sc_card_t *card, unsigned char sfid,
u8 *ef, size_t ef_len)
{
int r;
/* we write less bytes than possible. this is a workaround for acr 122,
* which only supports apdus of max 250 bytes */
size_t write = maxresp - 8, wrote = 0;
size_t write = MAX_SM_APDU_DATA_SIZE, wrote = 0;
sc_apdu_t apdu;
struct iso_sm_ctx *iso_sm_ctx = card->sm_ctx.info.cmd_data;