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krb5: Reorder checks in _key_schedule

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_krb5_find_enctype is a moderately expensive operation, as it
does a linear search of the enctype lists. Avoid calling it
in _key_schedule when we already have a key schedule in place.

This change makes the most common check the first in the function.
This commit is contained in:
Simon Wilkinson
2014-12-31 11:59:03 +00:00
committed by Jeffrey Altman
parent aedc1fd4bd
commit 152a23f2ce
1 changed files with 6 additions and 3 deletions
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9
lib/krb5/crypto.c
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@@ -132,9 +132,14 @@ _key_schedule(krb5_context context,
struct _krb5_key_data *key)
{
krb5_error_code ret;
struct _krb5_encryption_type *et = _krb5_find_enctype(key->key->keytype);
struct _krb5_encryption_type *et;
struct _krb5_key_type *kt;
if (key->schedule != NULL)
return 0;
et = _krb5_find_enctype(key->key->keytype);
if (et == NULL) {
return unsupported_enctype (context,
key->key->keytype);
@@ -144,8 +149,6 @@ _key_schedule(krb5_context context,
if(kt->schedule == NULL)
return 0;
if (key->schedule != NULL)
return 0;
ALLOC(key->schedule, 1);
if (key->schedule == NULL)
return krb5_enomem(context);