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ndef sig decoding

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This commit is contained in:
merlokk 2019-03-05 18:14:30 +02:00
parent a2be59db25
commit 581fe408ba
1 changed files with 33 additions and 1 deletions
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34
client/mifare/ndef.c
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@ -11,6 +11,7 @@
#include "ndef.h"
#include "ui.h"
#include "emv/dump.h"
#include "crypto/asn1utils.h"
#define STRBOOL(p) ((p) ? "+" : "-")
@ -134,13 +135,44 @@ int ndefPrintHeader(NDEFHeader_t *header) {
}
int ndefDecodeSig(uint8_t *sig, size_t siglen) {
size_t indx = 0;
PrintAndLogEx(NORMAL, "\tsignature version: 0x%02x", sig[0]);
if (sig[0] != 0x01) {
PrintAndLogEx(ERR, "signature version unknown.");
return 1;
}
indx++;
while (indx < siglen) {
if (sig[indx] == 0x04) {
size_t intsiglen = (sig[indx + 1] << 8) + sig[indx + 2];
indx += 3;
PrintAndLogEx(NORMAL, "\tsignature [%d]: %s", intsiglen, sprint_hex_inrow(&sig[indx], intsiglen));
uint8_t rval[300] = {0};
uint8_t sval[300] = {0};
int res = ecdsa_asn1_get_signature(&sig[indx], intsiglen, rval, sval);
if (!res) {
PrintAndLogEx(NORMAL ,"\t\tr: %s", sprint_hex(rval, 32));
PrintAndLogEx(NORMAL ,"\t\ts: %s", sprint_hex(sval, 32));
}
indx += intsiglen;
continue;
}
if (sig[indx] == 0x80) {
size_t intchainlen = (sig[indx + 1] << 8) + sig[indx + 2];
indx += 3;
PrintAndLogEx(NORMAL, "\tchain [%d]: %.*s", intchainlen, intchainlen, &sig[indx]);
indx += intchainlen;
continue;
}
size_t skiplen = (sig[indx + 1] << 8) + sig[indx + 2];
indx += skiplen;
}
return 0;
};