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Add first draft or read_server_params

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-08-13 10:09:10 +02:00
parent 23dcbe3f16
commit cb7cd03412
2 changed files with 163 additions and 23 deletions
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36
include/mbedtls/ecjpake.h
View file

@ -39,6 +39,7 @@ typedef struct
mbedtls_ecp_point X2; /**< Public key two */
mbedtls_ecp_point X3; /**< Public key three */
mbedtls_ecp_point X4; /**< Public key four */
mbedtls_ecp_point Xp; /**< Peer's public key (Xs or Xc) */
mbedtls_mpi xa; /**< Our first secret (x1 or x3) */
mbedtls_mpi xb; /**< Our second secret (x2 or x4) */
@ -126,6 +127,7 @@ int mbedtls_ecjpake_tls_write_server_ext( mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/*
* \brief Read and process contents of the ServerHello extension
* (excluding extension type and length bytes)
@ -141,6 +143,40 @@ int mbedtls_ecjpake_tls_read_server_ext( mbedtls_ecjpake_context *ctx,
const unsigned char *buf,
size_t len );
/*
* \brief Generate and write ServerECJPAKEParams
* (the contents for the ServerKeyExchange)
*
* \param ctx Context to use
* \param buf Buffer to write the contents to
* \param len Buffer size
* \param olen Will be updated with the number of bytes written
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \return 0 if successfull,
* a negative error code otherwise
*/
int mbedtls_ecjpake_tls_write_server_params( mbedtls_ecjpake_context *ctx,
unsigned char *buf, size_t len, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/*
* \brief Read and process ServerECJPAKEParams
* (the contents for the ServerKeyExchange)
*
* \param ctx Context to use
* \param buf Pointer to the message
* \param len Message length
*
* \return 0 if successfull,
* a negative error code otherwise
*/
int mbedtls_ecjpake_tls_read_server_params( mbedtls_ecjpake_context *ctx,
const unsigned char *buf,
size_t len );
/*
* \brief Free a context's content
*

150
library/ecjpake.c
View file

@ -51,6 +51,7 @@ void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx )
mbedtls_ecp_point_init( &ctx->X2 );
mbedtls_ecp_point_init( &ctx->X3 );
mbedtls_ecp_point_init( &ctx->X4 );
mbedtls_ecp_point_init( &ctx->Xp );
mbedtls_mpi_init( &ctx->xa );
mbedtls_mpi_init( &ctx->xb );
@ -72,6 +73,7 @@ void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx )
mbedtls_ecp_point_free( &ctx->X2 );
mbedtls_ecp_point_free( &ctx->X3 );
mbedtls_ecp_point_free( &ctx->X4 );
mbedtls_ecp_point_free( &ctx->Xp );
mbedtls_mpi_free( &ctx->xa );
mbedtls_mpi_free( &ctx->xb );
@ -497,6 +499,67 @@ int mbedtls_ecjpake_tls_write_server_ext( mbedtls_ecjpake_context *ctx,
"server", buf, len, olen, f_rng, p_rng ) );
}
/*
* Read and process ServerECJPAKEParams (7.4.2.5)
*/
int mbedtls_ecjpake_tls_read_server_params( mbedtls_ecjpake_context *ctx,
const unsigned char *buf,
size_t len )
{
int ret;
const unsigned char *p = buf;
const unsigned char *end = buf + len;
mbedtls_ecp_group grp;
mbedtls_ecp_point GB;
mbedtls_mpi one;
mbedtls_ecp_group_init( &grp );
mbedtls_ecp_point_init( &GB );
mbedtls_mpi_init( &one );
/*
* We need that before parsing in order to check Xs as we read it
* GB = X1 + X2 + X3 (7.4.2.5.1)
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &GB, &one, &ctx->X1,
&one, &ctx->X2 ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &GB, &one, &GB,
&one, &ctx->X3 ) );
/*
* struct {
* ECParameters curve_params;
* ECJPAKEKeyKP ecjpake_key_kp;
* } ServerECJPAKEParams;
*/
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_group( &grp, &p, len ) );
MBEDTLS_MPI_CHK( ecjpake_kkp_read( ctx->md_info, &ctx->grp,
&GB, &ctx->Xp, "server", &p, end ) );
if( p != end )
{
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
/*
* Xs already checked, only thing left to check is the group
*/
if( grp.id != ctx->grp.id )
{
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
goto cleanup;
}
cleanup:
mbedtls_ecp_group_free( &grp );
mbedtls_ecp_point_free( &GB );
mbedtls_mpi_free( &one );
return( ret );
}
#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
@ -515,7 +578,7 @@ int mbedtls_ecjpake_self_test( int verbose )
}
#else
static const unsigned char ecjpake_test_kkpp[] = {
static const unsigned char ecjpake_test_cli_ext[] = {
0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19,
0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44,
0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad,
@ -546,6 +609,55 @@ static const unsigned char ecjpake_test_kkpp[] = {
0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0
};
static const unsigned char ecjpake_test_srv_ext[] = {
0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb,
0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18,
0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47,
0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f,
0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7,
0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d,
0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64,
0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36,
0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2,
0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec,
0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16,
0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96,
0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3,
0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19,
0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f,
0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8,
0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7,
0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea,
0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5,
0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6,
0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31,
0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d,
0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8,
0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee,
0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84,
0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f,
0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80,
0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12
};
static const unsigned char ecjpake_test_srv_kx[] = {
0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23,
0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c,
0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f,
0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca,
0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26,
0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55,
0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38,
0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6,
0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9,
0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4,
0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2,
0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8,
0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd,
0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c
};
#if 0
/* For tests we don't need a secure RNG;
* use the LGC from Numerical Recipes for simplicity */
static int ecjpake_lgc( void *p, unsigned char *out, size_t len )
@ -564,6 +676,7 @@ static int ecjpake_lgc( void *p, unsigned char *out, size_t len )
return( 0 );
}
#endif
#define TEST_ASSERT( x ) \
do { \
@ -583,8 +696,6 @@ int mbedtls_ecjpake_self_test( int verbose )
{
int ret;
mbedtls_ecjpake_context ctx;
unsigned char buf[1000];
size_t len;
char secret[] = "test passphrase";
mbedtls_ecjpake_init( &ctx );
@ -596,30 +707,23 @@ int mbedtls_ecjpake_self_test( int verbose )
sizeof( secret ) - 1 ) == 0 );
if( verbose != 0 )
mbedtls_printf( " ECJPAKE test #1 (client ext read): " );
mbedtls_printf( " ECJPAKE test #1 (read in sequence): " );
/* This is not realistic because it uses the same context for client and
* server, but it ensures the context has all of X1 to X4 when reading the
* key exchange message, so this is convenient for a quick test */
TEST_ASSERT( mbedtls_ecjpake_tls_read_client_ext( &ctx,
ecjpake_test_kkpp,
sizeof( ecjpake_test_kkpp ) ) == 0 );
ecjpake_test_cli_ext,
sizeof( ecjpake_test_cli_ext ) ) == 0 );
/* Corrupt message */
memcpy( buf, ecjpake_test_kkpp, sizeof( ecjpake_test_kkpp ) );
buf[sizeof( ecjpake_test_kkpp ) - 1]--;
TEST_ASSERT( mbedtls_ecjpake_tls_read_client_ext( &ctx,
buf, sizeof( ecjpake_test_kkpp ) )
== MBEDTLS_ERR_ECP_VERIFY_FAILED );
TEST_ASSERT( mbedtls_ecjpake_tls_read_server_ext( &ctx,
ecjpake_test_srv_ext,
sizeof( ecjpake_test_srv_ext ) ) == 0 );
if( verbose != 0 )
mbedtls_printf( "passed\n" );
if( verbose != 0 )
mbedtls_printf( " ECJPAKE test #2 (client ext write/read): " );
TEST_ASSERT( mbedtls_ecjpake_tls_write_client_ext( &ctx,
buf, sizeof( buf ), &len,
ecjpake_lgc, NULL ) == 0 );
TEST_ASSERT( mbedtls_ecjpake_tls_read_client_ext( &ctx, buf, len ) == 0 );
TEST_ASSERT( mbedtls_ecjpake_tls_read_server_params( &ctx,
ecjpake_test_srv_kx,
sizeof( ecjpake_test_srv_kx ) ) == 0 );
if( verbose != 0 )
mbedtls_printf( "passed\n" );