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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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3
include/psa/crypto_compat.h
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@ -339,7 +339,8 @@ MBEDTLS_PSA_DEPRECATED static inline psa_status_t psa_asymmetric_verify( psa_key
*/ */
#define PSA_AEAD_DECRYPT_OUTPUT_SIZE_2_ARG( alg, ciphertext_length ) \ #define PSA_AEAD_DECRYPT_OUTPUT_SIZE_2_ARG( alg, ciphertext_length ) \
MBEDTLS_DEPRECATED_CONSTANT( size_t, \ MBEDTLS_DEPRECATED_CONSTANT( size_t, \
PSA_ALG_IS_AEAD( alg ) ? \ PSA_ALG_IS_AEAD( alg ) && \
(ciphertext_length) > PSA_ALG_AEAD_GET_TAG_LENGTH( alg ) ? \
(ciphertext_length) - PSA_ALG_AEAD_GET_TAG_LENGTH( alg ) : \ (ciphertext_length) - PSA_ALG_AEAD_GET_TAG_LENGTH( alg ) : \
0 ) 0 )

3
include/psa/crypto_sizes.h
View File

@ -323,7 +323,8 @@
* return 0. * return 0.
*/ */
#define PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg, ciphertext_length) \ #define PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg, ciphertext_length) \
(PSA_AEAD_NONCE_LENGTH(key_type, alg) != 0 ? \ (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) : \ (ciphertext_length) - PSA_ALG_AEAD_GET_TAG_LENGTH(alg) : \
0) 0)