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Improve the description of PSA_ALG_ANY_HASH

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Make it clearer what PSA_ALG_ANY_HASH can and cannot be used for.
This commit is contained in:
Gilles Peskine 2019-01-28 13:29:01 +01:00
parent eb2d4b9037
commit 763fb9a150
1 changed files with 8 additions and 5 deletions
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13
include/psa/crypto_values.h
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@ -668,15 +668,18 @@
/** SHA3-512 */
#define PSA_ALG_SHA3_512 ((psa_algorithm_t)0x01000013)
/** Allow any hash algorithm.
/** In a hash-and-sign algorithm policy, allow any hash algorithm.
*
* This value may only be used to form the algorithm usage field of a policy
* for a signature algorithm that is parametrized by a hash. That is,
* suppose that `PSA_xxx_SIGNATURE` is one of the following macros:
* This value may be used to form the algorithm usage field of a policy
* for a signature algorithm that is parametrized by a hash. The key
* may then be used to perform operations using the same signature
* algorithm parametrized with any supported hash.
*
* That is, suppose that `PSA_xxx_SIGNATURE` is one of the following macros:
* - #PSA_ALG_RSA_PKCS1V15_SIGN, #PSA_ALG_RSA_PSS,
* - #PSA_ALG_DSA, #PSA_ALG_DETERMINISTIC_DSA,
* - #PSA_ALG_ECDSA, #PSA_ALG_DETERMINISTIC_ECDSA.
* Then you may create a key as follows:
* Then you may create and use a key as follows:
* - Set the key usage field using #PSA_ALG_ANY_HASH, for example:
* ```
* psa_key_policy_set_usage(&policy,