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Add some comments to document some non-obvious coding choices

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Gilles Peskine 2018-03-07 16:41:37 +01:00 committed by itayzafrir
parent 03182e99b6
commit 6d9121381a
1 changed files with 7 additions and 3 deletions
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10
library/psa_crypto.c
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@ -305,6 +305,7 @@ psa_status_t psa_import_key(psa_key_slot_t key,
if( PSA_KEY_TYPE_IS_RAW_BYTES( type ) )
{
/* Ensure that a bytes-to-bit conversion won't overflow. */
if( data_length > SIZE_MAX / 8 )
return( PSA_ERROR_NOT_SUPPORTED );
slot->data.raw.data = mbedtls_calloc( 1, data_length );
@ -396,7 +397,7 @@ psa_status_t psa_destroy_key(psa_key_slot_t key)
#endif /* defined(MBEDTLS_ECP_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put it. */
* put in. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
@ -445,7 +446,7 @@ psa_status_t psa_get_key_information(psa_key_slot_t key,
#endif /* defined(MBEDTLS_ECP_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put it. */
* put in. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
@ -503,8 +504,11 @@ psa_status_t psa_export_key(psa_key_slot_t key,
return( PSA_SUCCESS );
}
else
#endif /* definedMBEDTLS_PK_WRITE_C) */
#endif /* defined(MBEDTLS_PK_WRITE_C) */
{
/* This shouldn't happen in the reference implementation, but
it is valid for a special-purpose implementation to omit
support for exporting certain key types. */
return( PSA_ERROR_NOT_SUPPORTED );
}
}