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Implement and test mbedtls_mpi_mod_raw_random

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In the basic/XXX=core test cases, use odd upper bounds, because the mod
version of random() only supports odd upper bounds (the upper bound is a
modulus and the mod modules only support odd moduli).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2022-12-06 22:54:09 +01:00
parent 8c32b24a35
commit a57cf9813a
4 changed files with 149 additions and 17 deletions
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34
library/bignum_mod_raw.h
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@@ -297,6 +297,40 @@ void mbedtls_mpi_mod_raw_add( mbedtls_mpi_uint *X,
/* BEGIN MERGE SLOT 6 */
/** Generate a random number uniformly in a range.
*
* This function generates a random number between \p min inclusive and
* \p N exclusive.
*
* The procedure complies with RFC 6979 §3.3 (deterministic ECDSA)
* when the RNG is a suitably parametrized instance of HMAC_DRBG
* and \p min is \c 1.
*
* \note There are `N - min` possible outputs. The lower bound
* \p min can be reached, but the upper bound \p N cannot.
*
* \param X The destination MPI, in canonical representation modulo \p N.
* It must not be aliased with \p N or otherwise overlap it.
* \param min The minimum value to return. It must be strictly smaller
* than \b N.
* \param N The modulus.
* This is the upper bound of the output range, exclusive.
* \param f_rng The RNG function to use. This must not be \c NULL.
* \param p_rng The RNG parameter to be passed to \p f_rng.
*
* \return \c 0 if successful.
* \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.
*/
int mbedtls_mpi_mod_raw_random( mbedtls_mpi_uint *X,
mbedtls_mpi_uint min,
const mbedtls_mpi_mod_modulus *N,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/* END MERGE SLOT 6 */
/* BEGIN MERGE SLOT 7 */