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Correct the maximum generated nonce length for CCM

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psa_aead_generate_nonce() could generate a nonce of up to 13 bytes,
depending on the inputs to psa_aead_set_lengths().

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
This commit is contained in:
Bence Szépkúti 2021-03-04 10:32:59 +01:00
parent fc86f3f147
commit 0153c9436b
1 changed files with 5 additions and 4 deletions
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9
include/psa/crypto_sizes.h
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@ -351,9 +351,10 @@
* or the parameters are incompatible, return 0. * or the parameters are incompatible, return 0.
*/ */
#define PSA_AEAD_NONCE_LENGTH(key_type, alg) \ #define PSA_AEAD_NONCE_LENGTH(key_type, alg) \
(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) == 16 && \ (PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) == 16 ? \
(PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CCM || \ PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CCM ? 13 : \
PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_GCM) ? 12 : \ PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_GCM ? 12 : \
0 : \
(key_type) == PSA_KEY_TYPE_CHACHA20 && \ (key_type) == PSA_KEY_TYPE_CHACHA20 && \
PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CHACHA20_POLY1305 ? 12 : \ PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CHACHA20_POLY1305 ? 12 : \
0) 0)
@ -369,7 +370,7 @@
* just the largest size that may be generated by * just the largest size that may be generated by
* #psa_aead_generate_nonce(). * #psa_aead_generate_nonce().
*/ */
#define PSA_AEAD_NONCE_MAX_SIZE 12 #define PSA_AEAD_NONCE_MAX_SIZE 13
/** A sufficient output buffer size for psa_aead_update(). /** A sufficient output buffer size for psa_aead_update().
* *