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mbedtls_ctr_drbg_update_ret: correct doc for input length limit

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Unlike mbedtls_ctr_drbg_update, this function returns an error if the
length limit is exceeded, rather than silently truncating the input.
This commit is contained in:
Gilles Peskine 2018-09-12 19:15:53 +02:00
parent 5da0505842
commit c4a8017e3e
1 changed files with 5 additions and 6 deletions
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11
include/mbedtls/ctr_drbg.h
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@ -239,16 +239,15 @@ int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
/**
* \brief This function updates the state of the CTR_DRBG context.
*
* \note If \p add_len is greater than
* #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT, only the first
* #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT Bytes are used.
* The remaining Bytes are silently discarded.
*
* \param ctx The CTR_DRBG context.
* \param additional The data to update the state with.
* \param add_len Length of \p additional data.
* \param add_len Length of \p additional in bytes. This must be at
* most #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG if
* \p add_len is more than
* #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT.
* \return An error from the underlying AES cipher on failure.
*/
int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx,