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2002-06-05 Timo Schulz <ts@winpt.org>

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* mainproc.c (symkey_decrypt_sesskey): New.
        (proc_symkey_enc): Support for encrypted session keys.
This commit is contained in:
Timo Schulz 2002-06-05 10:31:08 +00:00
parent 098a5229d1
commit 3b6a0c36a2
2 changed files with 32 additions and 0 deletions
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5
g10/ChangeLog
View File

@ -1,3 +1,8 @@
2002-06-05 Timo Schulz <ts@winpt.org>
* mainproc.c (symkey_decrypt_sesskey): New.
(proc_symkey_enc): Support for encrypted session keys.
2002-06-04 David Shaw <dshaw@jabberwocky.com>
* sign.c (hash_for, sign_file): When encrypting and signing at the

27
g10/mainproc.c
View File

@ -237,6 +237,31 @@ add_signature( CTX c, PACKET *pkt )
return 1;
}
static void
symkey_decrypt_sesskey( DEK *dek, byte *sesskey, size_t slen )
{
CIPHER_HANDLE hd;
if ( slen > 33 ) {
log_error( "weird size for an encrypted session key" );
return;
}
hd = cipher_open( dek->algo, CIPHER_MODE_CFB, 1 );
cipher_setkey( hd, dek->key, dek->keylen );
cipher_setiv( hd, NULL, 0 );
cipher_decrypt( hd, sesskey, sesskey, slen );
cipher_close( hd );
/* check first byte (the cipher algo) */
if ( sesskey[0] > 10 ) {
log_error( "invalid symkey algorithm detected\n" );
return;
}
/* now we replace the dek components with the real session key
to decrypt the contents of the sequencing packet. */
dek->keylen = cipher_get_keylen( sesskey[0] );
dek->algo = sesskey[0];
memcpy( dek->key, sesskey + 1, dek->keylen );
}
static void
proc_symkey_enc( CTX c, PACKET *pkt )
@ -264,6 +289,8 @@ proc_symkey_enc( CTX c, PACKET *pkt )
c->dek = passphrase_to_dek( NULL, 0, algo, &enc->s2k, 0, NULL );
if (c->dek)
c->dek->algo_info_printed = 1;
if ( c->dek && enc->seskeylen )
symkey_decrypt_sesskey( c->dek, enc->seskey, enc->seskeylen );
}
leave:
free_packet(pkt);