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Code Activity

2003-08-18 Timo Schulz <twoaday@freakmail.de>

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* encode.c (encode_sesskey): Checked the code and removed
        the warning since all compatibility checks with PGP succeeded.
        * mainproc.c (symkey_decrypt_sesskey): Better check for the
        algorithm and check the return values of some functions.
This commit is contained in:
Timo Schulz 2003-08-18 21:25:03 +00:00
parent 4eb5165019
commit 73b5da4c7d
3 changed files with 64 additions and 49 deletions
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7
g10/ChangeLog
View File

@ -1,3 +1,10 @@
2003-08-18 Timo Schulz <twoaday@freakmail.de>
* encode.c (encode_sesskey): Checked the code and removed
the warning since all compatibility checks with PGP succeeded.
* mainproc.c (symkey_decrypt_sesskey): Better check for the
algorithm and check the return values of some functions.
2003-08-07 Werner Koch <wk@gnupg.org>
* pkglue.c (pk_sign): Fix last change.

11
g10/encode.c
View File

@ -80,7 +80,6 @@ encode_store( const char *filename )
static void
encode_sesskey (DEK * dek, DEK ** ret_dek, byte * enckey)
{
#warning This functions needs a review.
CIPHER_HANDLE hd;
DEK * c;
byte buf[33];
@ -93,12 +92,16 @@ encode_sesskey( DEK *dek, DEK **ret_dek, byte *enckey )
make_session_key (c);
/*log_hexdump ("thekey", c->key, c->keylen);*/
/* the encrypted session key is prefixed with a one-octet algorithm id */
buf[0] = c->algo;
memcpy (buf + 1, c->key, c->keylen);
gcry_cipher_open (&hd, dek->algo, GCRY_CIPHER_MODE_CFB, 1 );
gcry_cipher_setkey( hd, dek->key, dek->keylen );
/* due to the fact that we use only checked values, consider each
failure as fatal. */
if (gcry_cipher_open (&hd, dek->algo, GCRY_CIPHER_MODE_CFB, 1))
BUG();
if (gcry_cipher_setkey (hd, dek->key, dek->keylen))
BUG();
gcry_cipher_setiv (hd, NULL, 0);
gcry_cipher_encrypt (hd, buf, c->keylen + 1, NULL, 0);
gcry_cipher_close (hd);

15
g10/mainproc.c
View File

@ -244,18 +244,23 @@ symkey_decrypt_sesskey( DEK *dek, byte *sesskey, size_t slen )
CIPHER_HANDLE hd;
int n;
if ( slen < 17 || slen > 33 ) {
if (slen < 17 || slen > 33)
{
log_error ( _("weird size for an encrypted session key (%d)\n"),
(int)slen);
return;
}
gcry_cipher_open ( &hd, dek->algo, GCRY_CIPHER_MODE_CFB, 1 );
gcry_cipher_setkey( hd, dek->key, dek->keylen );
/* we checked the DEK values before, so consider all errors as fatal */
if (gcry_cipher_open (&hd, dek->algo, GCRY_CIPHER_MODE_CFB, 1))
BUG();
if (gcry_cipher_setkey (hd, dek->key, dek->keylen))
BUG();
gcry_cipher_setiv (hd, NULL, 0);
gcry_cipher_decrypt (hd, sesskey, slen, NULL, 0);
gcry_cipher_close (hd);
/* check first byte (the cipher algo) */
if ( sesskey[0] > 10 ) {
if (openpgp_cipher_test_algo (sesskey[0]))
{
log_error (_("invalid symkey algorithm detected (%d)\n"),
sesskey[0]);
return;
@ -265,7 +270,7 @@ symkey_decrypt_sesskey( DEK *dek, byte *sesskey, size_t slen )
BUG ();
/* now we replace the dek components with the real session key
to decrypt the contents of the sequencing packet. */
dek->keylen = gcry_cipher_get_algo_keylen (sesskey[0]);
dek->keylen = n;
dek->algo = sesskey[0];
memcpy (dek->key, sesskey + 1, dek->keylen);
/*log_hexdump ("thekey", dek->key, dek->keylen);*/