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Generalize dh_flag in mbedtls_mpi_gen_prime

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Setting the dh_flag to 1 used to indicate that the caller requests safe
primes from mbedtls_mpi_gen_prime. We generalize the functionality to
make room for more flags in that parameter.
This commit is contained in:
Janos Follath 2018-08-14 11:08:41 +01:00
parent 53546ea099
commit 7c025a9f50
3 changed files with 16 additions and 6 deletions
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14
include/mbedtls/bignum.h
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@ -740,13 +740,23 @@ int mbedtls_mpi_is_prime( const mbedtls_mpi *X,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Flags for mbedtls_mpi_gen_prime()
*
* Each of these flags is a constraint on the result X returned by
* mbedtls_mpi_gen_prime().
*/
typedef enum {
MBEDTLS_MPI_GEN_PRIME_FLAG_DH = 0x0001, /**< (X-1)/2 is prime too */
} mbedtls_mpi_gen_prime_flag_t;
/**
* \brief Prime number generation
*
* \param X Destination MPI
* \param nbits Required size of X in bits
* ( 3 <= nbits <= MBEDTLS_MPI_MAX_BITS )
* \param dh_flag If 1, then (X-1)/2 will be prime too
* \param flags Mask of flags of type #mbedtls_mpi_gen_prime_flag_t
* \param f_rng RNG function
* \param p_rng RNG parameter
*
@ -754,7 +764,7 @@ int mbedtls_mpi_is_prime( const mbedtls_mpi *X,
* MBEDTLS_ERR_MPI_ALLOC_FAILED if memory allocation failed,
* MBEDTLS_ERR_MPI_BAD_INPUT_DATA if nbits is < 3
*/
int mbedtls_mpi_gen_prime( mbedtls_mpi *X, size_t nbits, int dh_flag,
int mbedtls_mpi_gen_prime( mbedtls_mpi *X, size_t nbits, int flags,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );