Regarding custom or vendor specific usage flags in PSA

[mgudda-dot]

Dear Sir/Madam,

I was referring to your page on Key Usage Flags.
https://arm-software.github.io/psa-api/crypto/1.4/api/keys/policy.html#key-usage-flags

Since KeyUsage flags is a 32-bit integer, and PSA already assigned bits till 0x00020000 (18 types of KeyUsage).

Can a vendor add vendor specific KeyUsage flags to implement a vendor specific key management / crypto operation implementation?

Atleast on a example header file (https://arm-software.github.io/psa-api/crypto/1.4/appendix/example_header.html) I could find as below:

typedef uint32_t psa_key_usage_t;
#define PSA_KEY_USAGE_EXPORT ((psa_key_usage_t)0x00000001)
#define PSA_KEY_USAGE_COPY ((psa_key_usage_t)0x00000002)
#define PSA_KEY_USAGE_CACHE ((psa_key_usage_t)0x00000004)
#define PSA_KEY_USAGE_ENCRYPT ((psa_key_usage_t)0x00000100)
#define PSA_KEY_USAGE_DECRYPT ((psa_key_usage_t)0x00000200)
#define PSA_KEY_USAGE_SIGN_MESSAGE ((psa_key_usage_t)0x00000400)
#define PSA_KEY_USAGE_VERIFY_MESSAGE ((psa_key_usage_t)0x00000800)
#define PSA_KEY_USAGE_SIGN_HASH ((psa_key_usage_t)0x00001000)
#define PSA_KEY_USAGE_VERIFY_HASH ((psa_key_usage_t)0x00002000)
#define PSA_KEY_USAGE_DERIVE ((psa_key_usage_t)0x00004000)
#define PSA_KEY_USAGE_VERIFY_DERIVATION ((psa_key_usage_t)0x00008000)
#define PSA_KEY_USAGE_DERIVE_PUBLIC ((psa_key_usage_t)0x00000080)
#define PSA_KEY_USAGE_WRAP ((psa_key_usage_t)0x00010000)
#define PSA_KEY_USAGE_UNWRAP ((psa_key_usage_t)0x00020000)

Thanks and Regards,
mgudda-dot