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Fix calculation in PSA_AEAD_UPDATE_OUTPUT_SIZE

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This commit is contained in:
Gilles Peskine 2019-05-14 16:08:59 +02:00
parent f02aec90dc
commit 248010caa0
1 changed files with 6 additions and 3 deletions
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7
include/psa/crypto_sizes.h
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@ -53,6 +53,9 @@
#define PSA_BITS_TO_BYTES(bits) (((bits) + 7) / 8)
#define PSA_BYTES_TO_BITS(bytes) ((bytes) * 8)
#define PSA_ROUND_UP_TO_MULTIPLE(block_size, length) \
(((length) + (block_size) - 1) / (block_size) * (block_size))
/** The size of the output of psa_hash_finish(), in bytes.
*
* This is also the hash size that psa_hash_verify() expects.
@ -317,8 +320,8 @@
* implementation to delay the output until it has a full block. */
#define PSA_AEAD_UPDATE_OUTPUT_SIZE(alg, input_length) \
(PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg) ? \
((plaintext_length) + PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE - 1) / PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE : \
(plaintext_length))
PSA_ROUND_UP_TO_MULTIPLE(PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE, (input_length)) : \
(input_length))
/** A sufficient ciphertext buffer size for psa_aead_finish().
*