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Minor documentation improvements

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This commit is contained in:
Gilles Peskine 2019-05-22 11:45:59 +02:00
parent 52315e4c16
commit 549ea8676a
2 changed files with 5 additions and 5 deletions
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2
include/psa/crypto_extra.h
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@ -83,7 +83,7 @@ extern "C" {
* attacks based on arithmetic relations between different * attacks based on arithmetic relations between different
* computations made with the same key, or can escalate harmless * computations made with the same key, or can escalate harmless
* side channels into exploitable ones. Use this function only * side channels into exploitable ones. Use this function only
* if it is necessary to support a protocol for which is has been * if it is necessary to support a protocol for which it has been
* verified that the usage of the key with multiple algorithms * verified that the usage of the key with multiple algorithms
* is safe. * is safe.
*/ */

8
library/psa_crypto.c
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@ -748,7 +748,7 @@ static psa_algorithm_t psa_key_policy_algorithm_intersection(
psa_algorithm_t alg1, psa_algorithm_t alg1,
psa_algorithm_t alg2 ) psa_algorithm_t alg2 )
{ {
/* Common case: the policy only allows alg. */ /* Common case: both sides actually specify the same policy. */
if( alg1 == alg2 ) if( alg1 == alg2 )
return( alg1 ); return( alg1 );
/* If the policies are from the same hash-and-sign family, check /* If the policies are from the same hash-and-sign family, check
@ -769,12 +769,12 @@ static psa_algorithm_t psa_key_policy_algorithm_intersection(
static int psa_key_algorithm_permits( psa_algorithm_t policy_alg, static int psa_key_algorithm_permits( psa_algorithm_t policy_alg,
psa_algorithm_t requested_alg ) psa_algorithm_t requested_alg )
{ {
/* Common case: the policy only allows alg. */ /* Common case: the policy only allows requested_alg. */
if( requested_alg == policy_alg ) if( requested_alg == policy_alg )
return( 1 ); return( 1 );
/* If policy_alg is a hash-and-sign with a wildcard for the hash, /* If policy_alg is a hash-and-sign with a wildcard for the hash,
* and alg is the same hash-and-sign family with any hash, * and requested_alg is the same hash-and-sign family with any hash,
* then alg is compliant with policy_alg. */ * then requested_alg is compliant with policy_alg. */
if( PSA_ALG_IS_HASH_AND_SIGN( requested_alg ) && if( PSA_ALG_IS_HASH_AND_SIGN( requested_alg ) &&
PSA_ALG_SIGN_GET_HASH( policy_alg ) == PSA_ALG_ANY_HASH ) PSA_ALG_SIGN_GET_HASH( policy_alg ) == PSA_ALG_ANY_HASH )
{ {