Commit 2235b7f2 authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

Simplify tls1_set_ec_id. 



Reviewed-by: default avatarMatt Caswell <matt@openssl.org>
parent 2fa2d15a

ssl/t1_lib.c

+12 −24
Original line number Diff line number Diff line
@@ -221,6 +221,7 @@ typedef struct { 
    unsigned int flags;         /* Flags: currently just field type */

} tls_curve_info;



# define TLS_CURVE_TYPE          0x1

# define TLS_CURVE_CHAR2         0x1

# define TLS_CURVE_PRIME         0x0
@@ -617,46 +618,33 @@ int tls1_set_curves_list(unsigned char **pext, size_t *pextlen, 
static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,

                          EC_KEY *ec)

{

    int is_prime, id;

    int id;

    const EC_GROUP *grp;

    const EC_METHOD *meth;

    if (!ec)

        return 0;

    /* Determine if it is a prime field */

    grp = EC_KEY_get0_group(ec);

    if (!grp)

        return 0;

    meth = EC_GROUP_method_of(grp);

    if (!meth)

        return 0;

    if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)

        is_prime = 1;

    else

        is_prime = 0;

    /* Determine curve ID */

    id = EC_GROUP_get_curve_name(grp);

    id = tls1_ec_nid2curve_id(id);

    /* If we have an ID set it, otherwise set arbitrary explicit curve */

    if (id) {

    /* If no id return error: we don't support arbitrary explicit curves */

    if (id == 0)

        return 0;

    curve_id[0] = 0;

    curve_id[1] = (unsigned char)id;

    } else {

        curve_id[0] = 0xff;

        if (is_prime)

            curve_id[1] = 0x01;

        else

            curve_id[1] = 0x02;

    }

    if (comp_id) {

        if (EC_KEY_get0_public_key(ec) == NULL)

            return 0;

        if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) {

            if (is_prime)

        if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_UNCOMPRESSED) {

            *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;

        } else {

            if ((nid_list[id - 1].flags & TLS_CURVE_TYPE) == TLS_CURVE_PRIME)

                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;

            else

                *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;

        } else

            *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;

        }

    }

    return 1;

}