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Add ecp_check_prvkey, with test

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Also group key checking and generation functions in ecp.h and ecp.c.
This commit is contained in:
Manuel Pégourié-Gonnard 2013-07-01 14:06:13 +02:00
parent b8c6e0e3e9
commit c8dc295e83
4 changed files with 126 additions and 66 deletions
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61
include/polarssl/ecp.h
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@ -228,25 +228,6 @@ int ecp_is_zero( ecp_point *pt );
*/
int ecp_copy( ecp_point *P, const ecp_point *Q );
/**
* \brief Check that a point is a valid public key on this curve
*
* \param grp Curve/group the point should belong to
* \param pt Point to check
*
* \return 0 if point is a valid public key,
* POLARSSL_ERR_ECP_GENERIC otherwise.
*
* \note This function only checks the point is non-zero, has valid
* coordinates and lies on the curve, but not that it is
* indeed a multiple of G. This is additional check is more
* expensive, isn't required by standards, and shouldn't be
* necessary if the group used has a small cofactor. In
* particular, it is useless for the NIST groups which all
* have a cofactor of 1.
*/
int ecp_check_pubkey( const ecp_group *grp, const ecp_point *pt );
/**
* \brief Import a non-zero point from two ASCII strings
*
@ -437,6 +418,44 @@ int ecp_sub( const ecp_group *grp, ecp_point *R,
int ecp_mul( const ecp_group *grp, ecp_point *R,
const mpi *m, const ecp_point *P );
/**
* \brief Check that a point is a valid public key on this curve
*
* \param grp Curve/group the point should belong to
* \param pt Point to check
*
* \return 0 if point is a valid public key,
* POLARSSL_ERR_ECP_GENERIC otherwise.
*
* \note This function only checks the point is non-zero, has valid
* coordinates and lies on the curve, but not that it is
* indeed a multiple of G. This is additional check is more
* expensive, isn't required by standards, and shouldn't be
* necessary if the group used has a small cofactor. In
* particular, it is useless for the NIST groups which all
* have a cofactor of 1.
*
* \note Uses bare components rather than an ecp_keypair structure
* in order to ease use with other structures such as
* ecdh_context of ecdsa_context.
*/
int ecp_check_pubkey( const ecp_group *grp, const ecp_point *pt );
/**
* \brief Check that an mpi is a valid private key for this curve
*
* \param grp Group used
* \param d Integer to check
*
* \return 0 if point is a valid private key,
* POLARSSL_ERR_ECP_GENERIC otherwise.
*
* \note Uses bare components rather than an ecp_keypair structure
* in order to ease use with other structures such as
* ecdh_context of ecdsa_context.
*/
int ecp_check_prvkey( const ecp_group *grp, const mpi *d );
/**
* \brief Generate a keypair
*
@ -448,6 +467,10 @@ int ecp_mul( const ecp_group *grp, ecp_point *R,
*
* \return 0 if successful,
* or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
*
* \note Uses bare components rather than an ecp_keypair structure
* in order to ease use with other structures such as
* ecdh_context of ecdsa_context.
*/
int ecp_gen_keypair( const ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),