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Algorithm encoding: add flag bit PSA_ALG_AEAD_FROM_BLOCK_FLAG

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Make it easy to distinguish generic constructions on top of block
ciphers, such as CCM or GCM, from specialized algorithms such as
Chacha20-Poly1305.
This commit is contained in:
Gilles Peskine
2019-05-06 15:10:16 +02:00
parent d22b6c4f89
commit 679693ee49
3 changed files with 27 additions and 4 deletions
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25
include/psa/crypto_values.h
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@ -874,13 +874,34 @@
*/
#define PSA_ALG_CBC_PKCS7 ((psa_algorithm_t)0x04600101)
#define PSA_ALG_AEAD_FROM_BLOCK_FLAG ((psa_algorithm_t)0x00400000)
/** Whether the specified algorithm is an AEAD mode on a block cipher.
*
* \param alg An algorithm identifier (value of type #psa_algorithm_t).
*
* \return 1 if \p alg is an AEAD algorithm which is an AEAD mode based on
* a block cipher, 0 otherwise.
* This macro may return either 0 or 1 if \p alg is not a supported
* algorithm identifier.
*/
#define PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg) \
(((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_AEAD_FROM_BLOCK_FLAG)) == \
(PSA_ALG_CATEGORY_AEAD | PSA_ALG_AEAD_FROM_BLOCK_FLAG))
/** The CCM authenticated encryption algorithm.
*/
#define PSA_ALG_CCM ((psa_algorithm_t)0x06001001)
#define PSA_ALG_CCM ((psa_algorithm_t)0x06401001)
/** The GCM authenticated encryption algorithm.
*/
#define PSA_ALG_GCM ((psa_algorithm_t)0x06001002)
#define PSA_ALG_GCM ((psa_algorithm_t)0x06401002)
/** The Chacha20-Poly1305 AEAD algorithm.
*
* The ChaCha20_Poly1305 construction is defined in RFC 7539.
*/
#define PSA_ALG_CHACHA20_POLY1305 ((psa_algorithm_t)0x06001005)
/* In the encoding of a AEAD algorithm, the bits corresponding to
* PSA_ALG_AEAD_TAG_LENGTH_MASK encode the length of the AEAD tag.