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mbedtls_mpi_random: document MBEDTLS_ERR_MPI_NOT_ACCEPTABLE

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Note that this error has a negligible probability with a "crypto-sized"
bound, but macroscopic probability with a small bound.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-04-13 21:28:38 +02:00
parent e39ee8e0a2
commit 33701a62b2
1 changed files with 5 additions and 0 deletions
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5
include/mbedtls/bignum.h
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@ -896,6 +896,11 @@ int mbedtls_mpi_fill_random( mbedtls_mpi *X, size_t size,
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if a memory allocation failed. * \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if a memory allocation failed.
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if \p min or \p N is invalid * \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if \p min or \p N is invalid
* or if they are incompatible. * or if they are incompatible.
* \return #MBEDTLS_ERR_MPI_NOT_ACCEPTABLE if the implementation was
* unable to find a suitable value within a limited number
* of attempts. This has a negligible probability if \p N
* is significantly larger than \p min, which is the case
* for all usual cryptographic applications.
* \return Another negative error code on failure. * \return Another negative error code on failure.
*/ */
int mbedtls_mpi_random( mbedtls_mpi *X, int mbedtls_mpi_random( mbedtls_mpi *X,