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Document and check the consistency of truncated MAC encodings

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Add comments noting that the maximum length of a MAC must fit in
PSA_ALG_MAC_TRUNCATION_MASK. Add a unit test that verifies that the
maximum MAC size fits.
This commit is contained in:
Gilles Peskine
2018-08-21 14:54:54 +02:00
parent 3111981d94
commit e1f2d7d1ac
4 changed files with 30 additions and 0 deletions
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3
include/psa/crypto_sizes.h
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@ -79,6 +79,9 @@
*/
/* All non-HMAC MACs have a maximum size that's smaller than the
* minimum possible value of PSA_HASH_MAX_SIZE in this implementation. */
/* Note that the encoding of truncated MAC algorithms limits this value
* to 64 bytes.
*/
#define PSA_MAC_MAX_SIZE PSA_HASH_MAX_SIZE
/* The maximum size of an RSA key on this implementation, in bits.