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Support v5 signature generation (not fully working yet).

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2022-04-19 21:28:11 +09:00
parent ad7a9b0a6a
commit bf46db1a1e
1 changed files with 31 additions and 2 deletions
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33
g10/sign.c
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@ -342,10 +342,18 @@ hash_sigversion_to_magic (gcry_md_hd_t md, const PKT_signature *sig,
if (sig->hashed)
{
n = sig->hashed->len;
if (sig->version == 5)
{
gcry_md_putc (md, (n >> 24));
gcry_md_putc (md, (n >> 16));
}
gcry_md_putc (md, (n >> 8) );
gcry_md_putc (md, n );
gcry_md_write (md, sig->hashed->data, n );
n += 6;
if (sig->version == 5)
n += 8;
else
n += 6;
}
else
{
@ -946,7 +954,10 @@ write_signature_packets (ctrl_t ctrl,
return gpg_error_from_syserror ();
if (pk->version >= 5)
sig->version = 5; /* Required for v5 keys. */
{
sig->version = 5; /* Required for v5 keys. */
gcry_randomize (sig->v5_salt, 16, GCRY_STRONG_RANDOM);
}
else
sig->version = 4; /* Required. */
@ -1769,6 +1780,7 @@ make_keysig_packet (ctrl_t ctrl,
gcry_md_hd_t md;
u32 pk_keyid[2], pksk_keyid[2];
unsigned int signhints;
byte v5_salt[16];
log_assert ((sigclass >= 0x10 && sigclass <= 0x13) || sigclass == 0x1F
|| sigclass == 0x20 || sigclass == 0x18 || sigclass == 0x19
@ -1806,6 +1818,12 @@ make_keysig_packet (ctrl_t ctrl,
if (gcry_md_open (&md, digest_algo, 0))
BUG ();
if (sigversion == 5)
{
gcry_randomize (v5_salt, 16, GCRY_STRONG_RANDOM);
gcry_md_write (md, v5_salt, 16);
}
/* Hash the public key certificate. */
hash_public_key (md, pk);
@ -1822,6 +1840,8 @@ make_keysig_packet (ctrl_t ctrl,
/* Make the signature packet. */
sig = xmalloc_clear (sizeof *sig);
sig->version = sigversion;
if (sig->version >= 5)
memcpy (sig->v5_salt, v5_salt, 16);
sig->flags.exportable = 1;
sig->flags.revocable = 1;
keyid_from_pk (pksk, sig->keyid);
@ -1883,6 +1903,7 @@ update_keysig_packet (ctrl_t ctrl,
gcry_md_hd_t md;
u32 pk_keyid[2], pksk_keyid[2];
unsigned int signhints = 0;
byte v5_salt[16];
if ((!orig_sig || !pk || !pksk)
|| (orig_sig->sig_class >= 0x10 && orig_sig->sig_class <= 0x13 && !uid)
@ -1914,6 +1935,12 @@ update_keysig_packet (ctrl_t ctrl,
if (gcry_md_open (&md, digest_algo, 0))
BUG ();
if (orig_sig->version == 5)
{
gcry_randomize (v5_salt, 16, GCRY_STRONG_RANDOM);
gcry_md_write (md, v5_salt, 16);
}
/* Hash the public key certificate and the user id. */
hash_public_key (md, pk);
@ -1924,6 +1951,8 @@ update_keysig_packet (ctrl_t ctrl,
/* Create a new signature packet. */
sig = copy_signature (NULL, orig_sig);
if (sig->version >= 5)
memcpy (sig->v5_salt, v5_salt, 16);
sig->digest_algo = digest_algo;