/**
* Process the MANAGE SECURITY ENVIRONMENT instruction (0x22). ISO7816-4, Section 7.5.11
*
* <p>This command can be also used to prepare key generation. In this case the algorithm
* indication is not required, in fact, should not be present. Note that the key identifiers
* should be already set up with put data before that.
*/
private void processManageSecurityEnvironment(APDU apdu) {
boolean forKeyGeneration = false;
if (state == STATE_INITIAL) {
forKeyGeneration = true;
} else if (state == STATE_PREPERSONALISED) {
ISOException.throwIt(SW_INS_NOT_SUPPORTED);
}
pin.reset();
byte[] buf = apdu.getBuffer();
byte p1 = buf[OFFSET_P1];
byte p2 = buf[OFFSET_P2];
// P1 should be:
// (a) 0x40: computation, decipherment, internal authentication, ...
// (b) 0x01: set
if (p1 != (byte) 0x41) {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
byte[] expectedKeyId = null;
// P2 should be one of the following, see ISO7816-4 Table 79
if (p2 == (byte) 0xa4) {
expectedKeyId = authKeyId;
} else if (p2 == (byte) 0xb6) {
expectedKeyId = signKeyId;
} else if (p2 == (byte) 0xB8) {
expectedKeyId = decKeyId;
} else {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
short lc = unsigned(buf[OFFSET_LC]);
if (lc == 0) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
apdu.setIncomingAndReceive();
short offset = OFFSET_CDATA;
lc += OFFSET_CDATA;
// Tag for the private key:
short len = checkDataObject(buf, offset, lc, (byte) 0x84);
offset += 2;
if (len != expectedKeyId[0]) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
if (Util.arrayCompare(buf, offset, expectedKeyId, (short) 1, len) != 0) {
ISOException.throwIt(SW_KEY_NOT_FOUND);
}
offset += len;
// Algorithm identfier tag
if (!forKeyGeneration) {
if (offset >= lc) {
ISOException.throwIt(SW_WRONG_DATA);
}
len = checkDataObject(buf, offset, lc, (byte) 0x80);
offset += 2;
if (len != 1) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
byte sAlg = buf[offset++];
if (offset != lc) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
if (sAlg < ALG_AUTH_DEC_RSA || sAlg > ALG_SIGN_RSA_PKCS1_SHA1MD5) {
ISOException.throwIt(SW_WRONG_DATA);
}
tmp[TMP_SIGNALG_OFFSET] = sAlg;
} else {
if (offset != lc) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
}
if (expectedKeyId == authKeyId) {
currentPrivateKey[0] = authKeyPrivate;
} else if (expectedKeyId == signKeyId) {
currentPrivateKey[0] = signKeyPrivate;
} else if (expectedKeyId == decKeyId) {
currentPrivateKey[0] = decKeyPrivate;
}
}
/** Process the SELECT (file) instruction (0xA4) ISO7816-4 Section 7.1.1 */
private void processSelectFile(APDU apdu) {
byte[] buf = apdu.getBuffer();
byte p1 = buf[OFFSET_P1];
// byte p2 = buf[OFFSET_P2];
short lc = unsigned(buf[OFFSET_LC]);
if (p1 == 0x04) {
// Select the AID of the applet
// do heavy verification, just for the fun of it ;)
if (lc != (short) 0x0C) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
apdu.setIncomingAndReceive();
if (Util.arrayCompare(buf, OFFSET_CDATA, myAID, (short) 0, lc) != 0) {
ISOException.throwIt(SW_WRONG_DATA);
}
return;
}
short id = 0;
switch (p1) {
case (byte) 0x00:
// Direct selection of MF, DF, or EF:
if (lc != 0 && lc != 2) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
if (lc > 0) {
apdu.setIncomingAndReceive();
id = Util.makeShort(buf[OFFSET_CDATA], buf[(short) (OFFSET_CDATA + 1)]);
} else {
id = FileSystem.MASTER_FILE_ID;
}
if (!fileSystem.selectEntryAbsolute(id)) {
ISOException.throwIt(SW_FILE_NOT_FOUND);
}
break;
case (byte) 0x01:
case (byte) 0x02:
// Select the child under the current DF,
// p1 0x01 DF identifier in data field
// p1 0x02 EF identifier in data field
if (lc != 2) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
apdu.setIncomingAndReceive();
id = Util.makeShort(buf[OFFSET_CDATA], buf[(short) (OFFSET_CDATA + 1)]);
if (!fileSystem.selectEntryUnderCurrent(id, p1 == (byte) 0x02)) {
ISOException.throwIt(SW_FILE_NOT_FOUND);
}
break;
case (byte) 0x03:
// Select the parent of the current DF
// no command data
if (lc != 0) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
if (!fileSystem.selectEntryParent()) {
ISOException.throwIt(SW_FILE_NOT_FOUND);
}
break;
case (byte) 0x08:
case (byte) 0x09:
// Select by path
// p1 0x08 from MF
// p1 0x09 from current DF
// data field: the path without the head
if (lc == 0 || (short) (lc % 2) != 0) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
apdu.setIncomingAndReceive();
if (!fileSystem.selectEntryByPath(buf, OFFSET_CDATA, lc, p1 == (byte) 0x08)) {
ISOException.throwIt(SW_FILE_NOT_FOUND);
}
break;
default:
ISOException.throwIt(SW_INCORRECT_P1P2);
}
}
