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Add ecp_gen_keypair()

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-01-26 14:42:45 +01:00
parent cf4365f560
commit 45a035a9ac
4 changed files with 73 additions and 0 deletions
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16
include/polarssl/ecp.h
View file

@ -309,6 +309,22 @@ 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 Generate a keypair
*
* \param grp ECP group
* \param d Destination MPI (secret part)
* \param Q Destination point (public part)
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \return 0 if successful,
* or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
*/
int ecp_gen_keypair( const ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Checkup routine
*

27
library/ecp.c
View file

@ -1127,6 +1127,33 @@ cleanup:
return( ret );
}
/*
* Generate a keypair (SEC1 3.2.1)
*/
int ecp_gen_keypair( const ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int count = 0;
size_t n_size = (grp->nbits + 7) / 8;
/*
* Generate d such that 1 <= n < N
*/
do
{
mpi_fill_random( d, n_size, f_rng, p_rng );
while( mpi_cmp_mpi( d, &grp->N ) >= 0 )
mpi_shift_r( d, 1 );
if( count++ > 10 )
return( POLARSSL_ERR_ECP_GENERIC );
}
while( mpi_cmp_int( d, 1 ) < 0 );
return( ecp_mul( grp, Q, d, &grp->G ) );
}
#if defined(POLARSSL_SELF_TEST)

3
tests/suites/test_suite_ecp.data
View file

@ -184,6 +184,9 @@ ecp_read_binary:SECP192R1:"0548d8082a3a1e3112bc03a8ef2f6d40d0a77a6f8e00cc99336ce
ECP read binary #6 (non-zero, OK)
ecp_read_binary:SECP192R1:"0448d8082a3a1e3112bc03a8ef2f6d40d0a77a6f8e00cc99336ceed4d7cba482e288669ee1b6415626d6f34d28501e060c":UNCOMPRESSED:"48d8082a3a1e3112bc03a8ef2f6d40d0a77a6f8e00cc9933":"6ceed4d7cba482e288669ee1b6415626d6f34d28501e060c":"01":0
ECP gen keypair
ecp_gen_keypair:SECP192R1
ECP mod p192 readable
ecp_fast_mod:SECP192R1:"000000000000010500000000000001040000000000000103000000000000010200000000000001010000000000000100"

27
tests/suites/test_suite_ecp.function
View file

@ -295,6 +295,33 @@ ecp_read_binary:id:input:format:x:y:z:ret
}
END_CASE
BEGIN_CASE
ecp_gen_keypair:id
{
ecp_group grp;
ecp_point Q;
mpi d;
rnd_pseudo_info rnd_info;
ecp_group_init( &grp );
ecp_point_init( &Q );
mpi_init( &d );
memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
TEST_ASSERT( ecp_use_known_dp( &grp, POLARSSL_ECP_DP_{id} ) == 0 );
TEST_ASSERT( ecp_gen_keypair( &grp, &d, &Q, &rnd_pseudo_rand, &rnd_info )
== 0 );
TEST_ASSERT( mpi_cmp_mpi( &d, &grp.N ) < 0 );
TEST_ASSERT( mpi_cmp_int( &d, 1 ) >= 0 );
ecp_group_free( &grp );
ecp_point_free( &Q );
mpi_free( &d );
}
END_CASE
BEGIN_CASE
ecp_selftest:
{