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MPILIB: add mpi_read_buf() and mpi_get_size() helpers

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Added a mpi_read_buf() helper function to export MPI to a buf provided by
the user, and a mpi_get_size() helper, that tells the user how big the buf is.
Changed mpi_free to use kzfree instead of kfree because it is used to free
crypto keys.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tadeusz Struk 2015-06-15 13:18:36 -07:00 • committed by Herbert Xu
parent 4beb106045
commit d37e296979
3 changed files with 86 additions and 22 deletions
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15
include/linux/mpi.h
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@ -81,6 +81,8 @@ MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
int mpi_fromstr(MPI val, const char *str);
u32 mpi_get_keyid(MPI a, u32 *keyid);
void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
int *sign);
void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
int mpi_set_buffer(MPI a, const void *buffer, unsigned nbytes, int sign);
@ -142,4 +144,17 @@ int mpi_rshift(MPI x, MPI a, unsigned n);
/*-- mpi-inv.c --*/
int mpi_invm(MPI x, MPI u, MPI v);
/* inline functions */
/**
* mpi_get_size() - returns max size required to store the number
*
* @a: A multi precision integer for which we want to allocate a bufer
*
* Return: size required to store the number
*/
static inline unsigned int mpi_get_size(MPI a)
{
return a->nlimbs * BYTES_PER_MPI_LIMB;
}
#endif /*G10_MPI_H */