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* mdc.c (use_mdc): Simplified.

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This commit is contained in:
Timo Schulz 2003-08-18 21:32:19 +00:00
parent 73b5da4c7d
commit f9867edfb8
2 changed files with 20 additions and 22 deletions
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1
g10/ChangeLog
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@ -4,6 +4,7 @@
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.
* mdc.c (use_mdc): Simplified.
2003-08-07 Werner Koch <wk@gnupg.org>

41
g10/encode.c
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@ -113,18 +113,26 @@ encode_sesskey (DEK * dek, DEK ** ret_dek, byte * enckey)
/* We try very hard to use a MDC */
static int
use_mdc(PK_LIST pk_list,int algo)
use_mdc (PK_LIST pk_list,int algo)
{
byte cipher_algid[4] = {
CIPHER_ALGO_AES,
CIPHER_ALGO_AES192,
CIPHER_ALGO_AES256,
CIPHER_ALGO_TWOFISH
};
int i;
/* --force-mdc overrides --disable-mdc */
if(opt.force_mdc)
if (opt.force_mdc)
return 1;
if(opt.disable_mdc)
if (opt.disable_mdc)
return 0;
/* Do the keys really support MDC? */
if(select_mdc_from_pklist(pk_list))
if (select_mdc_from_pklist (pk_list))
return 1;
/* The keys don't support MDC, so now we do a bit of a hack - if any
@ -132,26 +140,15 @@ use_mdc(PK_LIST pk_list,int algo)
can handle a MDC. This is valid for PGP 7, which can handle MDCs
though it will not generate them. 2440bis allows this, by the
way. */
if(select_algo_from_prefs(pk_list,PREFTYPE_SYM,
CIPHER_ALGO_AES,NULL)==CIPHER_ALGO_AES)
return 1;
if(select_algo_from_prefs(pk_list,PREFTYPE_SYM,
CIPHER_ALGO_AES192,NULL)==CIPHER_ALGO_AES192)
return 1;
if(select_algo_from_prefs(pk_list,PREFTYPE_SYM,
CIPHER_ALGO_AES256,NULL)==CIPHER_ALGO_AES256)
return 1;
if(select_algo_from_prefs(pk_list,PREFTYPE_SYM,
CIPHER_ALGO_TWOFISH,NULL)==CIPHER_ALGO_TWOFISH)
return 1;
for (i=0; i < DIM (cipher_algid); i++)
{
if (select_algo_from_prefs (pk_list, PREFTYPE_SYM, cipher_algid[i],
NULL) == cipher_algid[i])
return 1;
}
/* Last try. Use MDC for the modern ciphers. */
if( gcry_cipher_get_algo_blklen (algo) != 8)
if (gcry_cipher_get_algo_blklen (algo) != 8)
return 1;
return 0; /* No MDC */