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Use enum for slot state in PSA-based cipher context

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This commit is contained in:
Hanno Becker 2018-11-17 22:11:16 +00:00
parent 8d88a6e20d
commit ce61a32e6a
2 changed files with 21 additions and 7 deletions
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8
library/cipher.c
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@ -175,7 +175,7 @@ void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx )
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
if( cipher_psa->slot_state == 1 )
if( cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED )
{
/* xxx_free() doesn't allow to return failures. */
(void) psa_destroy_key( cipher_psa->slot );
@ -299,14 +299,16 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
/* Don't allow keys to be set multiple times. */
if( cipher_psa->slot_state != 0 )
if( cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
/* Find a fresh key slot to use. */
status = mbedtls_psa_get_free_key_slot( &cipher_psa->slot );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
cipher_psa->slot_state = 1; /* Indicate that we own the key slot. */
/* Indicate that we own the key slot and need to
* destroy it in mbedtls_cipher_free(). */
cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
/* From that point on, the responsibility for destroying the
* key slot is on mbedtls_cipher_free(). This includes the case