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New usage flag PSA_KEY_USAGE_COPY

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Document the new flag and allow its use.
This commit is contained in:
Gilles Peskine 2019-05-14 14:24:28 +02:00
parent 4318dfc8ec
commit 8e0206aa26
3 changed files with 26 additions and 0 deletions
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11
include/psa/crypto.h
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@ -850,6 +850,15 @@ psa_status_t psa_export_public_key(psa_key_handle_t handle,
* this function may be used to share a key with a different party, * this function may be used to share a key with a different party,
* subject to implementation-defined restrictions on key sharing. * subject to implementation-defined restrictions on key sharing.
* *
* The policy on the source key must have the usage flag
* #PSA_KEY_USAGE_COPY set.
* In addition, some lifetimes also require the source key to have the
* usage flag #PSA_KEY_USAGE_EXPORT, because otherwise the source key
* is locked inside a secure processing environment and cannot be
* extracted. For keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE or
* #PSA_KEY_LIFETIME_PERSISTENT, the usage flag #PSA_KEY_USAGE_COPY
* is sufficient to permit the copy.
*
* The resulting key may only be used in a way that conforms to * The resulting key may only be used in a way that conforms to
* both the policy of the original key and the policy specified in * both the policy of the original key and the policy specified in
* the \p attributes parameter: * the \p attributes parameter:
@ -902,6 +911,8 @@ psa_status_t psa_export_public_key(psa_key_handle_t handle,
* \p attributes specifies a key type, domain parameters or key size * \p attributes specifies a key type, domain parameters or key size
* which does not match the attributes of the source key. * which does not match the attributes of the source key.
* \retval #PSA_ERROR_NOT_PERMITTED * \retval #PSA_ERROR_NOT_PERMITTED
* The source key does not have the #PSA_KEY_USAGE_COPY usage flag.
* \retval #PSA_ERROR_NOT_PERMITTED
* The source key is not exportable and its lifetime does not * The source key is not exportable and its lifetime does not
* allow copying it to the target's lifetime. * allow copying it to the target's lifetime.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY * \retval #PSA_ERROR_INSUFFICIENT_MEMORY

14
include/psa/crypto_values.h
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@ -1459,6 +1459,20 @@
*/ */
#define PSA_KEY_USAGE_EXPORT ((psa_key_usage_t)0x00000001) #define PSA_KEY_USAGE_EXPORT ((psa_key_usage_t)0x00000001)
/** Whether the key may be copied.
*
* This flag allows the use of psa_crypto_copy() to make a copy of the key
* with the same policy or a more restrictive policy.
*
* For some lifetimes, copying a key also requires the usage flag
* #PSA_KEY_USAGE_EXPORT, because otherwise the source key
* is locked inside a secure processing environment and cannot be
* extracted. For keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE or
* #PSA_KEY_LIFETIME_PERSISTENT, the usage flag #PSA_KEY_USAGE_COPY
* is sufficient to permit the copy.
*/
#define PSA_KEY_USAGE_COPY ((psa_key_usage_t)0x00000002)
/** Whether the key may be used to encrypt a message. /** Whether the key may be used to encrypt a message.
* *
* This flag allows the key to be used for a symmetric encryption operation, * This flag allows the key to be used for a symmetric encryption operation,

1
library/psa_crypto.c
View File

@ -1344,6 +1344,7 @@ static psa_status_t psa_set_key_policy_internal(
const psa_key_policy_t *policy ) const psa_key_policy_t *policy )
{ {
if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT | if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT |
PSA_KEY_USAGE_COPY |
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_ENCRYPT |
PSA_KEY_USAGE_DECRYPT | PSA_KEY_USAGE_DECRYPT |
PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_SIGN |