eden-emu/mbedtls
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Make sure we don't underflow in the size macros

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Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
This commit is contained in:
Bence Szépkúti 2021-04-21 11:09:50 +02:00
parent b639d43538
commit 1dda21c4a4
2 changed files with 8 additions and 6 deletions
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5
include/psa/crypto_sizes.h
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@ -323,8 +323,9 @@
* return 0.
*/
#define PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg, ciphertext_length) \
(PSA_AEAD_NONCE_LENGTH(key_type, alg) != 0 ? \
(ciphertext_length) - PSA_ALG_AEAD_GET_TAG_LENGTH(alg) : \
(PSA_AEAD_NONCE_LENGTH(key_type, alg) != 0 && \
(ciphertext_length) > PSA_ALG_AEAD_GET_TAG_LENGTH(alg) ? \
(ciphertext_length) - PSA_ALG_AEAD_GET_TAG_LENGTH(alg) : \
0)
/** A sufficient output buffer size for psa_aead_decrypt(), for any of the