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[hf seos] Support variable length SIO #3025

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Merged
iceman1001 merged 1 commit into from
Nov 15, 2025
+7 −6
Merged

[hf seos] Support variable length SIO #3025

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13 changes: 7 additions & 6 deletions client/src/cmdhfseos.c
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Original file line number Diff line number Diff line change
Expand Up @@ -325,16 +325,17 @@ static int seos_get_data(uint8_t *rndICC, uint8_t *rndIFD, uint8_t *diversified_
// 8E is our MAC response (8 bytes)
// PrintAndLogEx(SUCCESS, "Raw Response..................... " _YELLOW_("%s"), sprint_hex_inrow(response, (resplen - 2)));

uint8_t cryptogram[64];
uint8_t responseCode[2];
uint8_t tag[2] = {0x00, 0x00};
int getDataSize = 0;

// ------------------- Cryptogram Response -------------------
if (resplen >= 2 && response[0] == 0x85 && response[1] == 0x40) {
uint8_t decrypted[64];
memcpy(cryptogram, response + 2, 64);
memcpy(responseCode, response + 68, 2);
if (resplen >= 2 && response[0] == 0x85 && response[1] >= 0x40) {
uint8_t cryptogram_length = response[1];
uint8_t cryptogram[cryptogram_length];
uint8_t decrypted[cryptogram_length];
memcpy(cryptogram, response + 2, cryptogram_length);
memcpy(responseCode, response + cryptogram_length + 4, 2);

// Decrypt the response
decrypt_cryptogram(diversified_enc_key, cryptogram, decrypted, sizeof(cryptogram), encryption_algorithm);
Expand All @@ -353,7 +354,7 @@ static int seos_get_data(uint8_t *rndICC, uint8_t *rndIFD, uint8_t *diversified_
memmove(decrypted, decrypted + 1, sizeof(decrypted) - 1);
memmove(sioOutput, decrypted + 2, getDataSize);
*sio_size = getDataSize;
memcpy(responseCode, response + 68, 2);
memcpy(responseCode, response + cryptogram_length + 4, 2);

PrintAndLogEx(SUCCESS, "Response Code.................... " _YELLOW_("%s"), sprint_hex_inrow(responseCode, (ARRAYLEN(responseCode))));
PrintAndLogEx(SUCCESS, "Output........................... " _YELLOW_("%s"), sprint_hex_inrow(sioOutput, getDataSize));
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