af-anssi
commented
2 years ago You are right, there is something odd in the response you get from you card. It seems your public key is RSA 2048 bits (= 256 bytes = 0x100) but the modulus in the response is longer (262 bytes = 0x106); the exponent is normal (3 bytes). See below for the parsing of the response.
7F49 82 0109
81 82 0100 (<= expected length, but actual data length is 0x106)
[000] B4 DD 22 74 D9 EA D7 B2 A0 C4 6A 51 EA 27 87 DD
[010] FD DD 38 AA 97 10 37 98 BE 47 A0 4A AC 9F 09 2A
[020] 44 D4 4B 13 33 D3 76 B1 E3 80 03 1D 88 9F E7 10
[030] 07 57 52 41 DA FD 05 E8 1D FA E6 D4 26 AA 12 22
[040] B4 A3 E6 69 34 5C 17 05 C6 0B 74 16 41 5A C3 3B
[050] ED 78 78 9F AE 86 4F EE 4E 4F 94 42 00 6E B1 1F
[060] B7 5B 72 48 2C 45 A5 4B 2D 52 64 62 68 B0 4C 61
[070] 1D 8B 6F 3B AA 6A 17 90 14 D7 CC 9E 7F F0 46 44
[080] F1 96 62 B3 8B 2B 81 07 1D D3 22 00 A0 EB 01 7B
[090] 9A F9 25 30 41 34 3D 39 8D A1 40 08 B4 E6 25 32
[0A0] 35 B4 CC 4E 00 4F 7E 99 11 0C F4 69 E1 14 25 30
[0B0] 41 68 DC 79 97 98 46 FE 8A 45 78 9D 9A 27 E5 A9
[0C0] A0 8A B5 2C BC 2B 46 DE 68 72 53 A2 94 EB D2 C8
[0D0] D1 09 44 72 31 13 08 D4 63 85 DA 1A FA C1 D2 F2
[0E0] B7 E4 2E 6C 96 E5 E1 57 CE 4B BE 11 8A E2 24 FD
[0F0] 60 74 C7 F5 28 2F 12 5E 12 35 84 FC 42 59 0E 6F
[100] 48 46 C7 D3 35 A9
82 03
[000] 01 00 01 Which version of SmartPGP are you running ? On which card have you installed it ? Could you post the output of gpg2 --card-status ?
v3rm0n
Trying to get the key from the card, but I'm seeing something that I don't understand.
For example, first command
gpg-connect-agent --hex "scd apdu 00 47 81 00 02 b8 00" /byeGivesSince I get
0x610EI'm running:gpg-connect-agent --hex "scd apdu 00 c0 00 00" /byeWhy do I think it's strange: the length of
0x7F49should be 265 (0x0109), but the actual response is longer (280 - 4 sw bytes - 5 header bytes = 271)Looks like the modulus is 6 bytes too long. If I remove it then everything fits:
What am I not getting here?