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Always configure PSA-based keys for encryption and decryption

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Mbed TLS cipher layer allows usage of keys for other purposes
than indicated in the `operation` parameter of `mbedtls_cipher_setkey()`.
The semantics of the PSA Crypto API, in contrast, checks key
usage against the key policy.

As a remedy, this commit modifies the PSA key slot setup to
always allow both encryption and decryption.
This commit is contained in:
Hanno Becker 2018-11-12 13:33:16 +00:00
parent e43164e8f1
commit 884f6af590
1 changed files with 7 additions and 1 deletions
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8
library/cipher.c
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@ -310,7 +310,13 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
/* Setup policy for the new key slot. */
psa_key_policy_init( &key_policy );
key_usage = mbedtls_psa_translate_cipher_operation( operation );
/* Mbed TLS' cipher layer doesn't enforce the mode of operation
* (encrypt vs. decrypt): it is possible to setup a key for encryption
* and use it for AEAD decryption. Until tests relying on this
* are changed, allow any usage in PSA. */
/* key_usage = mbedtls_psa_translate_cipher_operation( operation ); */
key_usage = PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT;
psa_key_policy_set_usage( &key_policy, key_usage, cipher_psa->alg );
status = psa_set_key_policy( cipher_psa->slot, &key_policy );
if( status != PSA_SUCCESS )