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Added ecp_read_binary().

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This commit is contained in:
Manuel Pégourié-Gonnard
2012-11-24 16:19:42 +01:00
committed by Paul Bakker
parent 37d218a8e3
commit 5e402d88ea
4 changed files with 106 additions and 1 deletions
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27
library/ecp.c
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@ -228,6 +228,33 @@ cleanup:
return( ret );
}
/*
* Import a point from unsigned binary data (SEC1 2.3.4)
*/
int ecp_read_binary( const ecp_group *grp, ecp_point *P, int format,
const unsigned char *buf, size_t ilen ) {
int ret;
size_t plen;
if( format != POLARSSL_ECP_PF_UNCOMPRESSED )
return( POLARSSL_ERR_ECP_GENERIC );
if( ilen == 1 && buf[0] == 0x00 )
return( ecp_set_zero( P ) );
plen = mpi_size( &grp-> P );
if( ilen != 2 * plen + 1 || buf[0] != 0x04 )
return( POLARSSL_ERR_ECP_GENERIC );
MPI_CHK( mpi_read_binary( &P->X, buf + 1, plen ) );
MPI_CHK( mpi_read_binary( &P->Y, buf + 1 + plen, plen ) );
MPI_CHK( mpi_lset( &P->Z, 1 ) );
cleanup:
return( ret );
}
/*
* Wrapper around fast quasi-modp functions, with fall-back to mpi_mod_mpi.
* See the documentation of struct ecp_group.