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Update comment on crypto_generichash_state allocation with sodium_malloc() (#501)

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Alexander Iljin 2017-03-02 02:29:50 +03:00 committed by Frank Denis
parent 862c747a20
commit fa0245cf1c
1 changed files with 4 additions and 5 deletions
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9
src/libsodium/include/sodium/utils.h
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@ -90,15 +90,14 @@ int sodium_munlock(void * const addr, const size_t len);
* a multiple of the required alignment. For this reason, these functions
* are designed to store data, such as secret keys and messages.
*
* sodium_malloc() can be used to allocate any libsodium data structure,
* with the exception of crypto_generichash_state.
* sodium_malloc() can be used to allocate any libsodium data structure.
*
* The crypto_generichash_state structure is packed and its length is
* either 357 or 361 bytes. For this reason, when using sodium_malloc() to
* allocate a crypto_generichash_state structure, padding must be added in
* order to ensure proper alignment:
* state = sodium_malloc((crypto_generichash_statebytes() + (size_t) 63U)
* & ~(size_t) 63U);
* order to ensure proper alignment. crypto_generichash_statebytes()
* returns the rounded up structure size, and should be prefered to sizeof():
* state = sodium_malloc(crypto_generichash_statebytes());
*/
SODIUM_EXPORT