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Fix EC J-PAKE failing when the payload is all-bits-zero

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Fix function mbedtls_ecp_mul_shortcuts() to skip multiplication when m
is 0 and simply assignt 0 to R. Additionally fix ecjpake_zkp_read() to
return MBEDTLS_ERR_ECP_INVALID_KEY when the above condintion is met.

Fix #1792

Signed-off-by: TRodziewicz <rodziewicz@gmail.com>
This commit is contained in:
TRodziewicz
2021-03-04 17:59:39 +01:00
parent 2ac5f8c04b
commit 9edff740e1
3 changed files with 17 additions and 2 deletions
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7
library/ecjpake.c
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@ -286,6 +286,13 @@ static int ecjpake_zkp_read( const mbedtls_md_info_t *md_info,
* Verification
*/
MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) );
if( mbedtls_mpi_cmp_int( &r,0 ) == 0 )
{
ret = MBEDTLS_ERR_ECP_INVALID_KEY;
goto cleanup;
}
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( (mbedtls_ecp_group *) grp,
&VV, &h, X, &r, G ) );