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New internal function psa_get_key_bits

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Isolate the code of psa_get_key_information that calculates the bit
size of a key into its own function which can be called by functions
that have a key slot pointer.
This commit is contained in:
Gilles Peskine 2018-07-06 16:02:09 +02:00 committed by itayzafrir
parent b0b255c82a
commit b870b188ad
1 changed files with 21 additions and 30 deletions
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49
library/psa_crypto.c
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@ -688,6 +688,24 @@ psa_status_t psa_destroy_key( psa_key_slot_t key )
return( PSA_SUCCESS );
}
/* Return the size of the key in the given slot, in bits. */
static size_t psa_get_key_bits( const key_slot_t *slot )
{
if( key_type_is_raw_bytes( slot->type ) )
return( slot->data.raw.bytes * 8 );
#if defined(MBEDTLS_RSA_C)
if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY ||
slot->type == PSA_KEY_TYPE_RSA_KEYPAIR )
return( mbedtls_rsa_get_bitlen( slot->data.rsa ) );
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
return( slot->data.ecp->grp.pbits );
#endif /* defined(MBEDTLS_ECP_C) */
/* Shouldn't happen except on an empty slot. */
return( 0 );
}
psa_status_t psa_get_key_information( psa_key_slot_t key,
psa_key_type_t *type,
size_t *bits )
@ -702,40 +720,13 @@ psa_status_t psa_get_key_information( psa_key_slot_t key,
status = psa_get_key_slot( key, &slot );
if( status != PSA_SUCCESS )
return( status );
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_EMPTY_SLOT );
if( type != NULL )
*type = slot->type;
if( key_type_is_raw_bytes( slot->type ) )
{
if( bits != NULL )
*bits = slot->data.raw.bytes * 8;
}
else
#if defined(MBEDTLS_RSA_C)
if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY ||
slot->type == PSA_KEY_TYPE_RSA_KEYPAIR )
{
if( bits != NULL )
*bits = mbedtls_rsa_get_bitlen( slot->data.rsa );
}
else
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
if( bits != NULL )
*bits = slot->data.ecp->grp.pbits;
}
else
#endif /* defined(MBEDTLS_ECP_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put in. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
*bits = psa_get_key_bits( slot );
return( PSA_SUCCESS );
}