diff options
| author | NIIBE Yutaka <[email protected]> | 2025-07-17 00:31:31 +0000 |
|---|---|---|
| committer | NIIBE Yutaka <[email protected]> | 2025-07-17 00:31:31 +0000 |
| commit | 4ad08a8998fa16f8329fb57b0a47fe7a9b973700 (patch) | |
| tree | c34ed67532af2d9c6509c800321cf94bff6115be | |
| parent | agent: Another fix for a regression with unknown curves and ssh (diff) | |
| download | gnupg-4ad08a8998fa16f8329fb57b0a47fe7a9b973700.tar.gz gnupg-4ad08a8998fa16f8329fb57b0a47fe7a9b973700.zip | |
agent: Fix for smartcard decryption returning x-coordinate only.
* agent/divert-scd.c (agent_card_ecc_kem): Handle the case
where smartcard returns x-coordinate only.
--
GnuPG-bug-id: 7709
Signed-off-by: NIIBE Yutaka <[email protected]>
| -rw-r--r-- | agent/divert-scd.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/agent/divert-scd.c b/agent/divert-scd.c index 1e5de4671..7e0d8eccb 100644 --- a/agent/divert-scd.c +++ b/agent/divert-scd.c @@ -517,6 +517,12 @@ agent_card_ecc_kem (ctrl_t ctrl, const unsigned char *ecc_ct, if (len == ecc_point_len) memcpy (ecc_ecdh, ecdh, len); + else if ((len - 1) * 2 == ecc_point_len - 1 && ecdh[0] == 0x02) + { + /* It's x-coordinate-only (compressed) point representation. */ + memcpy (ecc_ecdh, ecdh, len); + memset (ecc_ecdh + len, 0, ecc_point_len - len); + } else if (len == ecc_point_len + 1 && ecdh[0] == 0x40) /* The prefix */ memcpy (ecc_ecdh, ecdh + 1, len - 1); else |