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imsi-pseudo
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Mobile Identity routines

This commit is contained in:
Neels Hofmeyr 2020-02-24 21:26:05 +01:00
parent ba7a6f22a5
commit 984627047e
1 changed files with 49 additions and 3 deletions
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52
sim-applet/src/org/osmocom/IMSIPseudo/IMSIPseudo.java
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@ -29,6 +29,8 @@ public class IMSIPseudo extends Applet implements ToolkitInterface, ToolkitConst
'd', 'i', 'g', 'i', 't'};
private final Object[] itemListChangeIMSI = {changeIMSI, setDigit1, setDigit2};
private static final byte MI_IMSI = 1;
private IMSIPseudo() {
gsmFile = SIMSystem.getTheSIMView();
@ -139,6 +141,18 @@ public class IMSIPseudo extends Applet implements ToolkitInterface, ToolkitConst
return (byte)('A' + (bcd - 0xa));
}
private byte char2bcd(byte c)
{
if (c >= '0' && c <= '9')
return (byte)(c - '0');
else if (c >= 'A' && c <= 'F')
return (byte)(0xa + (c - 'A'));
else if (c >= 'a' && c <= 'f')
return (byte)(0xa + (c - 'a'));
else
return 0;
}
/* Convert BCD to string.
* The given nibble offsets are interpreted in BCD order, i.e. nibble 0 is bcd[0] & 0xf, nibble 1 is bcd[0] >> 4, nibble
* 3 is bcd[1] & 0xf, etc..
@ -174,8 +188,8 @@ public class IMSIPseudo extends Applet implements ToolkitInterface, ToolkitConst
return rc;
}
private boolean mi2str(byte dst[], byte dst_ofs, byte dst_len,
byte mi[], boolean allow_hex)
private byte mi2str(byte dst[], byte dst_ofs, byte dst_len,
byte mi[], boolean allow_hex)
{
/* The IMSI byte array by example:
* 08 99 10 07 00 00 10 74 90
@ -214,7 +228,39 @@ public class IMSIPseudo extends Applet implements ToolkitInterface, ToolkitConst
boolean odd_nr_of_digits = ((mi_type & 0x08) != 0);
byte start_nibble = 2 + 1; // 2 to skip the bytelen, 1 to skip the mi_type
byte end_nibble = (byte)(2 + bytelen * 2 - (odd_nr_of_digits ? 0 : 1));
return bcd2str(dst, dst_ofs, dst_len, mi, start_nibble, end_nibble, allow_hex);
bcd2str(dst, dst_ofs, dst_len, mi, start_nibble, end_nibble, allow_hex);
return (byte)(end_nibble - start_nibble);
}
private byte[] str2mi(byte str[], byte mi_type)
{
/* 1 byte of MI length.
* 1 nibble of mi_type.
* str.length nibbles of MI BCD.
* The first MI digit is in the high-nibble of the mi_type, so an odd amount of digits becomes
* (1 + str.length)/2 bytes; an even amount of digits has same amount of bytes with the last
* nibble unused (0xf0). */
byte len = (byte)(1 + (byte)(1 + str.length)/2);
byte mi[] = new byte[1 + len];
mi[0] = len;
boolean odd_digits = ((str.length & 1) != 0);
mi_type = (byte)(mi_type & 0x07);
if (odd_digits)
mi_type |= 0x08;
mi[1] = (byte)((char2bcd(str[0]) << 4) + mi_type);
byte str_i = 1;
for (byte bcd_i = 1; bcd_i < len; bcd_i++) {
byte data = char2bcd(str[str_i]);
str_i++;
if (str_i < str.length) {
data |= char2bcd(str[str_i]) << 4;
str_i++;
} else
data |= 0xf0;
mi[1 + bcd_i] = data;
}
return mi;
}
private void showIMSI() {