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Fix ECDH secret export for Mongomery curves

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We only switched to little endian for Curve25519, but all Montgomery
curves require little endian byte order.
This commit is contained in:
Janos Follath 2019-02-26 13:56:04 +00:00
parent bf42408528
commit 52ff8e9387
1 changed files with 1 additions and 1 deletions
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library/ecdh.c
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@ -638,7 +638,7 @@ static int ecdh_calc_secret_internal( mbedtls_ecdh_context_mbed *ctx,
*olen = ctx->grp.pbits / 8 + ( ( ctx->grp.pbits % 8 ) != 0 ); *olen = ctx->grp.pbits / 8 + ( ( ctx->grp.pbits % 8 ) != 0 );
if( ctx->grp.id == MBEDTLS_ECP_DP_CURVE25519 ) if( mbedtls_ecp_get_type( &ctx->grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
return mbedtls_mpi_write_binary_le( &ctx->z, buf, *olen ); return mbedtls_mpi_write_binary_le( &ctx->z, buf, *olen );
return mbedtls_mpi_write_binary( &ctx->z, buf, *olen ); return mbedtls_mpi_write_binary( &ctx->z, buf, *olen );