247 lines
8.5 KiB
Text
247 lines
8.5 KiB
Text
/* BEGIN_HEADER */
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#include "mbedtls/dhm.h"
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/* Sanity checks on a Diffie-Hellman parameter: check the length-value
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* syntax and check that the value is the expected one (taken from the
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* DHM context by the caller). */
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static int check_dhm_param_output( const mbedtls_mpi *expected,
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const unsigned char *buffer,
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size_t size,
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size_t *offset )
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{
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size_t n;
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mbedtls_mpi actual;
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int ok = 0;
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mbedtls_mpi_init( &actual );
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++mbedtls_test_info.step;
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TEST_ASSERT( size >= *offset + 2 );
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n = ( buffer[*offset] << 8 ) | buffer[*offset + 1];
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*offset += 2;
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/* The DHM param output from Mbed TLS has leading zeros stripped, as
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* permitted but not required by RFC 5246 \S4.4. */
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TEST_EQUAL( n, mbedtls_mpi_size( expected ) );
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TEST_ASSERT( size >= *offset + n );
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TEST_EQUAL( 0, mbedtls_mpi_read_binary( &actual, buffer + *offset, n ) );
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TEST_EQUAL( 0, mbedtls_mpi_cmp_mpi( expected, &actual ) );
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*offset += n;
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ok = 1;
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exit:
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mbedtls_mpi_free( &actual );
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return( ok );
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}
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/* Sanity checks on Diffie-Hellman parameters: syntax, range, and comparison
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* against the context. */
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static int check_dhm_params( const mbedtls_dhm_context *ctx,
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size_t x_size,
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const unsigned char *ske, size_t ske_len )
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{
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size_t offset = 0;
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/* Check that ctx->X and ctx->GX are within range. */
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TEST_ASSERT( mbedtls_mpi_cmp_int( &ctx->X, 1 ) > 0 );
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TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) < 0 );
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TEST_ASSERT( mbedtls_mpi_size( &ctx->X ) <= x_size );
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TEST_ASSERT( mbedtls_mpi_cmp_int( &ctx->GX, 1 ) > 0 );
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TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx->GX, &ctx->P ) < 0 );
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/* Check ske: it must contain P, G and G^X, each prefixed with a
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* 2-byte size. */
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if( !check_dhm_param_output( &ctx->P, ske, ske_len, &offset ) )
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goto exit;
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if( !check_dhm_param_output( &ctx->G, ske, ske_len, &offset ) )
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goto exit;
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if( !check_dhm_param_output( &ctx->GX, ske, ske_len, &offset ) )
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goto exit;
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TEST_EQUAL( offset, ske_len );
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return( 1 );
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exit:
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return( 0 );
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}
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_DHM_C:MBEDTLS_BIGNUM_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void dhm_do_dhm( int radix_P, char *input_P, int x_size,
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int radix_G, char *input_G, int result )
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{
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mbedtls_dhm_context ctx_srv;
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mbedtls_dhm_context ctx_cli;
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unsigned char ske[1000];
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unsigned char *p = ske;
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unsigned char pub_cli[1000];
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unsigned char sec_srv[1000];
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unsigned char sec_cli[1000];
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size_t ske_len = 0;
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size_t pub_cli_len = 0;
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size_t sec_srv_len;
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size_t sec_cli_len;
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int i;
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mbedtls_test_rnd_pseudo_info rnd_info;
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mbedtls_dhm_init( &ctx_srv );
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mbedtls_dhm_init( &ctx_cli );
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memset( ske, 0x00, 1000 );
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memset( pub_cli, 0x00, 1000 );
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memset( sec_srv, 0x00, 1000 );
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memset( sec_cli, 0x00, 1000 );
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memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );
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/*
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* Set params
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*/
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TEST_ASSERT( mbedtls_mpi_read_string( &ctx_srv.P, radix_P, input_P ) == 0 );
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TEST_ASSERT( mbedtls_mpi_read_string( &ctx_srv.G, radix_G, input_G ) == 0 );
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pub_cli_len = mbedtls_mpi_size( &ctx_srv.P );
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/*
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* First key exchange
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*/
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mbedtls_test_set_step( 10 );
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TEST_ASSERT( mbedtls_dhm_make_params( &ctx_srv, x_size, ske, &ske_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == result );
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if ( result != 0 )
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goto exit;
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if( !check_dhm_params( &ctx_srv, x_size, ske, ske_len ) )
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goto exit;
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ske[ske_len++] = 0;
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ske[ske_len++] = 0;
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TEST_ASSERT( mbedtls_dhm_read_params( &ctx_cli, &p, ske + ske_len ) == 0 );
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TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
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TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ),
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&sec_srv_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ), &sec_cli_len, NULL, NULL ) == 0 );
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TEST_ASSERT( sec_srv_len == sec_cli_len );
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TEST_ASSERT( sec_srv_len != 0 );
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TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
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/* Re-do calc_secret on server a few times to test update of blinding values */
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for( i = 0; i < 3; i++ )
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{
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mbedtls_test_set_step( 20 + i );
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sec_srv_len = 1000;
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TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv,
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sizeof( sec_srv ), &sec_srv_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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TEST_ASSERT( sec_srv_len == sec_cli_len );
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TEST_ASSERT( sec_srv_len != 0 );
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TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
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}
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/*
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* Second key exchange to test change of blinding values on server
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*/
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p = ske;
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mbedtls_test_set_step( 30 );
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TEST_ASSERT( mbedtls_dhm_make_params( &ctx_srv, x_size, ske, &ske_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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if( !check_dhm_params( &ctx_srv, x_size, ske, ske_len ) )
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goto exit;
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ske[ske_len++] = 0;
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ske[ske_len++] = 0;
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TEST_ASSERT( mbedtls_dhm_read_params( &ctx_cli, &p, ske + ske_len ) == 0 );
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TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
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TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ),
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&sec_srv_len,
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&mbedtls_test_rnd_pseudo_rand,
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&rnd_info ) == 0 );
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TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ), &sec_cli_len, NULL, NULL ) == 0 );
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TEST_ASSERT( sec_srv_len == sec_cli_len );
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TEST_ASSERT( sec_srv_len != 0 );
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TEST_ASSERT( memcmp( sec_srv, sec_cli, sec_srv_len ) == 0 );
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exit:
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mbedtls_dhm_free( &ctx_srv );
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mbedtls_dhm_free( &ctx_cli );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void dhm_make_public( int P_bytes, int radix_G, char *input_G, int result )
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{
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mbedtls_mpi P, G;
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mbedtls_dhm_context ctx;
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unsigned char output[MBEDTLS_MPI_MAX_SIZE];
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mbedtls_mpi_init( &P );
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mbedtls_mpi_init( &G );
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mbedtls_dhm_init( &ctx );
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TEST_ASSERT( mbedtls_mpi_lset( &P, 1 ) == 0 );
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TEST_ASSERT( mbedtls_mpi_shift_l( &P, ( P_bytes * 8 ) - 1 ) == 0 );
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TEST_ASSERT( mbedtls_mpi_set_bit( &P, 0, 1 ) == 0 );
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TEST_ASSERT( mbedtls_mpi_read_string( &G, radix_G, input_G ) == 0 );
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TEST_ASSERT( mbedtls_dhm_set_group( &ctx, &P, &G ) == 0 );
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TEST_ASSERT( mbedtls_dhm_make_public( &ctx, (int) mbedtls_mpi_size( &P ),
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output, sizeof(output),
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&mbedtls_test_rnd_pseudo_rand,
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NULL ) == result );
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exit:
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mbedtls_mpi_free( &P );
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mbedtls_mpi_free( &G );
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mbedtls_dhm_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
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void dhm_file( char * filename, char * p, char * g, int len )
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{
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mbedtls_dhm_context ctx;
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mbedtls_mpi P, G;
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mbedtls_dhm_init( &ctx );
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mbedtls_mpi_init( &P ); mbedtls_mpi_init( &G );
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TEST_ASSERT( mbedtls_mpi_read_string( &P, 16, p ) == 0 );
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TEST_ASSERT( mbedtls_mpi_read_string( &G, 16, g ) == 0 );
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TEST_ASSERT( mbedtls_dhm_parse_dhmfile( &ctx, filename ) == 0 );
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TEST_ASSERT( ctx.len == (size_t) len );
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TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx.P, &P ) == 0 );
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TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx.G, &G ) == 0 );
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exit:
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mbedtls_mpi_free( &P ); mbedtls_mpi_free( &G );
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mbedtls_dhm_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
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void dhm_selftest( )
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{
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TEST_ASSERT( mbedtls_dhm_self_test( 1 ) == 0 );
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}
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/* END_CASE */
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