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Fix with ASN1 encapsulation for keypair generation. It only affects RSA 4096 bits.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-04-04 22:00:29 +02:00
parent cf81a82645
commit afb16fff65
1 changed files with 11 additions and 7 deletions
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18
src/hsm/sc_hsm.c
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@@ -994,15 +994,19 @@ static int cmd_keypair_gen() {
res_APDU[0] = 0x67; res_APDU[0] = 0x67;
int outer_len = strlen(cvc.outer_car)+2+2+1+4; int outer_len = strlen(cvc.outer_car)+2+2+1+4;
int bytes_length = (cvclen+outer_len)/256; int bytes_length = 0;
if (cvclen%256 > 0) if (cvclen+outer_len < 128)
bytes_length++;
if (cvclen < 128)
res_APDU[1] = cvclen+outer_len; res_APDU[1] = cvclen+outer_len;
else if (cvclen+outer_len < 256) {
res_APDU[1] = 0x81;
res_APDU[2] = cvclen+outer_len;
bytes_length = 1;
}
else { else {
res_APDU[1] = 0x80|bytes_length; res_APDU[1] = 0x82;
for (int b = 1; b <= bytes_length; b++) res_APDU[2] = (cvclen+outer_len) >> 8;
res_APDU[1+b] = ((cvclen+outer_len)>>((bytes_length-b)*8))&0xff; res_APDU[3] = (cvclen+outer_len) & 0xff;
bytes_length = 2;
} }
memcpy(res_APDU+bytes_length+2, cvcbin, cvclen); memcpy(res_APDU+bytes_length+2, cvcbin, cvclen);
res_APDU[bytes_length+2+cvclen] = 0x42; res_APDU[bytes_length+2+cvclen] = 0x42;