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Change PSA Cipher macro safety to use block length

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Although checking if the key was symmetric was correct, its easier to
read if we just check the block length is not zero before we use it in a
division.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2021-07-08 16:50:01 +01:00
parent a02003babe
commit c22950c9d0
1 changed files with 1 additions and 2 deletions
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3
include/psa/crypto_sizes.h
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@ -992,8 +992,7 @@
*/
#define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length) \
(alg == PSA_ALG_CBC_PKCS7 ? \
(((key_type) & PSA_KEY_TYPE_CATEGORY_MASK) \
== PSA_KEY_TYPE_CATEGORY_SYMMETRIC ? \
(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) != 0 ? \
PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type), \
(input_length) + 1) + \
PSA_CIPHER_IV_LENGTH((key_type), (alg)) : 0) : \