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Added ecp_use_known_dp()

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Manuel Pégourié-Gonnard 2012-11-07 20:24:05 +01:00 committed by Paul Bakker
parent efaa31e9ae
commit a5402fee04
3 changed files with 88 additions and 5 deletions
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24
include/polarssl/ecp.h
View File

@ -32,9 +32,9 @@
/*
* ECP error codes
*
* (The functions written up to now return MPI error codes only.)
* (Only one error code available...)
*/
#define POLARSSL_ERR_ECP_GENERIC -0x007E /**< Generic ECP error */
/**
* \brief ECP point structure (affine coordinates)
@ -75,6 +75,12 @@ ecp_group;
* parameters. Therefore, only well-known domain parameters from trusted
* sources (such as the ones below) should be used.
*/
#define POLARSSL_ECP_DP_SECP192R1 0
#define POLARSSL_ECP_DP_SECP224R1 1
#define POLARSSL_ECP_DP_SECP256R1 2
#define POLARSSL_ECP_DP_SECP384R1 3
#define POLARSSL_ECP_DP_SECP521R1 4
#define POLARSSL_ECP_SECP192R1_P \
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"
#define POLARSSL_ECP_SECP192R1_B \
@ -215,6 +221,20 @@ int ecp_group_read_string( ecp_group *grp, int radix,
const char *p, const char *b,
const char *gx, const char *gy, const char *n);
/**
* \brief Set a group using well-known domain parameters
*
* \param grp Destination group
* \param index Index in the list of well-known domain parameters
*
* \return O if successul,
* POLARSSL_ERR_MPI_XXX if initialization failed
* POLARSSL_ERR_ECP_GENERIC if index is out of range
*
* \note Index should be a POLARSSL_ECP_DP_XXX macro.
*/
int ecp_use_known_dp( ecp_group *grp, size_t index );
/**
* \brief Addition: R = P + Q
*

1
include/polarssl/error.h
View File

@ -68,6 +68,7 @@
* SHA2 1 0x0078-0x0078
* SHA4 1 0x007A-0x007A
* PBKDF2 1 0x007C-0x007C
* ECP 1 0x007E-0x007E
*
* High-level module nr (3 bits - 0x1...-0x8...)
* Name ID Nr of Errors

64
library/ecp.c
View File

@ -154,7 +154,57 @@ cleanup:
return( ret );
}
#define dbg(X) printf(#X " = %s%lu\n", X.s < 0 ? "-" : "", X.p[0])
/*
* Set a group using well-known domain parameters
*/
int ecp_use_known_dp( ecp_group *grp, size_t index )
{
switch( index )
{
case POLARSSL_ECP_DP_SECP192R1:
return( ecp_group_read_string( grp, 16,
POLARSSL_ECP_SECP192R1_P,
POLARSSL_ECP_SECP192R1_B,
POLARSSL_ECP_SECP192R1_GX,
POLARSSL_ECP_SECP192R1_GY,
POLARSSL_ECP_SECP192R1_N )
);
case POLARSSL_ECP_DP_SECP224R1:
return( ecp_group_read_string( grp, 16,
POLARSSL_ECP_SECP224R1_P,
POLARSSL_ECP_SECP224R1_B,
POLARSSL_ECP_SECP224R1_GX,
POLARSSL_ECP_SECP224R1_GY,
POLARSSL_ECP_SECP224R1_N )
);
case POLARSSL_ECP_DP_SECP256R1:
return( ecp_group_read_string( grp, 16,
POLARSSL_ECP_SECP256R1_P,
POLARSSL_ECP_SECP256R1_B,
POLARSSL_ECP_SECP256R1_GX,
POLARSSL_ECP_SECP256R1_GY,
POLARSSL_ECP_SECP256R1_N )
);
case POLARSSL_ECP_DP_SECP384R1:
return( ecp_group_read_string( grp, 16,
POLARSSL_ECP_SECP384R1_P,
POLARSSL_ECP_SECP384R1_B,
POLARSSL_ECP_SECP384R1_GX,
POLARSSL_ECP_SECP384R1_GY,
POLARSSL_ECP_SECP384R1_N )
);
case POLARSSL_ECP_DP_SECP521R1:
return( ecp_group_read_string( grp, 16,
POLARSSL_ECP_SECP521R1_P,
POLARSSL_ECP_SECP521R1_B,
POLARSSL_ECP_SECP521R1_GX,
POLARSSL_ECP_SECP521R1_GY,
POLARSSL_ECP_SECP521R1_N )
);
}
return( POLARSSL_ERR_ECP_GENERIC );
}
/*
* Addition: R = P + Q, generic case (P != Q, P != 0, Q != 0, R != 0)
@ -510,6 +560,18 @@ int ecp_self_test( int verbose )
if( verbose != 0 )
printf( "passed\n" );
if( verbose != 0 )
printf( " ECP test #3 (use_known_dp): " );
for( i = 0; i <= POLARSSL_ECP_DP_SECP521R1; i++ )
{
MPI_CHK( ecp_use_known_dp( &grp, i ) );
}
if( verbose != 0 )
printf( "passed\n" );
cleanup:
if( ret != 0 && verbose != 0 )