Class: OpenSSL::PKey::EC::Group

Inherits:
Object
  • Object
show all
Defined in:
ext/openssl/ossl_pkey_ec.c

Defined Under Namespace

Classes: Error

Instance Method Summary collapse

Constructor Details

#OpenSSL::PKey::EC::Group.new(ec_group) ⇒ Object #OpenSSL::PKey::EC::Group.new(pem_or_der_encoded) ⇒ Object #OpenSSL::PKey::EC::Group.new(ec_method) ⇒ Object #OpenSSL::PKey::EC::Group.new(: GFp, bignum_p, bignum_a, bignum_b) ⇒ Object #OpenSSL::PKey::EC::Group.new(: GF2m, bignum_p, bignum_a, bignum_b) ⇒ Object

Creates a new EC::Group object.

ec_method is a symbol that represents an EC_METHOD. Currently the following are supported:

  • :GFp_simple

  • :GFp_mont

  • :GFp_nist

  • :GF2m_simple

If the first argument is :GFp or :GF2m, creates a new curve with given parameters.



738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
 
# File 'ext/openssl/ossl_pkey_ec.c', line 738

static VALUE ossl_ec_group_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE arg1, arg2, arg3, arg4;
    EC_GROUP *group;

    TypedData_Get_Struct(self, EC_GROUP, &ossl_ec_group_type, group);
    if (group)
        ossl_raise(rb_eRuntimeError, "EC_GROUP is already initialized");

    switch (rb_scan_args(argc, argv, "13", &arg1, &arg2, &arg3, &arg4)) {
    case 1:
        if (SYMBOL_P(arg1)) {
            const EC_METHOD *method = NULL;
            ID id = SYM2ID(arg1);

            if (id == s_GFp_simple) {
                method = EC_GFp_simple_method();
            } else if (id == s_GFp_mont) {
                method = EC_GFp_mont_method();
            } else if (id == s_GFp_nist) {
                method = EC_GFp_nist_method();
#if !defined(OPENSSL_NO_EC2M)
            } else if (id == s_GF2m_simple) {
                method = EC_GF2m_simple_method();
#endif
            }

            if (method) {
                if ((group = EC_GROUP_new(method)) == NULL)
                    ossl_raise(eEC_GROUP, "EC_GROUP_new");
            } else {
                ossl_raise(rb_eArgError, "unknown symbol, must be :GFp_simple, :GFp_mont, :GFp_nist or :GF2m_simple");
            }
        } else if (rb_obj_is_kind_of(arg1, cEC_GROUP)) {
            const EC_GROUP *arg1_group;

            SafeGetECGroup(arg1, arg1_group);
            if ((group = EC_GROUP_dup(arg1_group)) == NULL)
                ossl_raise(eEC_GROUP, "EC_GROUP_dup");
        } else {
            BIO *in = ossl_obj2bio(&arg1);

            group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
            if (!group) {
		OSSL_BIO_reset(in);
                group = d2i_ECPKParameters_bio(in, NULL);
            }

            BIO_free(in);

            if (!group) {
                const char *name = StringValueCStr(arg1);
                int nid = OBJ_sn2nid(name);

		ossl_clear_error(); /* ignore errors in d2i_ECPKParameters_bio() */
                if (nid == NID_undef)
                    ossl_raise(eEC_GROUP, "unknown curve name (%"PRIsVALUE")", arg1);

                group = EC_GROUP_new_by_curve_name(nid);
                if (group == NULL)
                    ossl_raise(eEC_GROUP, "unable to create curve (%"PRIsVALUE")", arg1);

                EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
                EC_GROUP_set_point_conversion_form(group, POINT_CONVERSION_UNCOMPRESSED);
            }
        }

        break;
    case 4:
        if (SYMBOL_P(arg1)) {
            ID id = SYM2ID(arg1);
            EC_GROUP *(*new_curve)(const BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *) = NULL;
            const BIGNUM *p = GetBNPtr(arg2);
            const BIGNUM *a = GetBNPtr(arg3);
            const BIGNUM *b = GetBNPtr(arg4);

            if (id == s_GFp) {
                new_curve = EC_GROUP_new_curve_GFp;
#if !defined(OPENSSL_NO_EC2M)
            } else if (id == s_GF2m) {
                new_curve = EC_GROUP_new_curve_GF2m;
#endif
            } else {
                ossl_raise(rb_eArgError, "unknown symbol, must be :GFp or :GF2m");
            }

            if ((group = new_curve(p, a, b, ossl_bn_ctx)) == NULL)
                ossl_raise(eEC_GROUP, "EC_GROUP_new_by_GF*");
        } else {
             ossl_raise(rb_eArgError, "unknown argument, must be :GFp or :GF2m");
        }

        break;
    default:
        ossl_raise(rb_eArgError, "wrong number of arguments");
    }

    if (group == NULL)
        ossl_raise(eEC_GROUP, "");
    RTYPEDDATA_DATA(self) = group;

    return self;
}

Instance Method Details

#asn1_flag ⇒ Integer

Returns the flags set on the group.

See also #asn1_flag=.

Returns:



1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1046

static VALUE ossl_ec_group_get_asn1_flag(VALUE self)
{
    EC_GROUP *group = NULL;
    int flag;

    GetECGroup(self, group);
    flag = EC_GROUP_get_asn1_flag(group);

    return INT2NUM(flag);
}

#asn1_flag=(flags) ⇒ Object

Sets flags on the group. The flag value is used to determine how to encode the group: encode explicit parameters or named curve using an OID.

The flag value can be either of:

  • EC::NAMED_CURVE

  • EC::EXPLICIT_CURVE

See the OpenSSL documentation for EC_GROUP_set_asn1_flag().



1071
1072
1073
1074
1075
1076
1077
1078
1079
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1071

static VALUE ossl_ec_group_set_asn1_flag(VALUE self, VALUE flag_v)
{
    EC_GROUP *group = NULL;

    GetECGroup(self, group);
    EC_GROUP_set_asn1_flag(group, NUM2INT(flag_v));

    return flag_v;
}

#get_cofactor ⇒ Object

Returns the cofactor of the group.

See the OpenSSL documentation for EC_GROUP_get_cofactor()



961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
 
# File 'ext/openssl/ossl_pkey_ec.c', line 961

static VALUE ossl_ec_group_get_cofactor(VALUE self)
{
    VALUE bn_obj;
    BIGNUM *bn;
    EC_GROUP *group = NULL;

    GetECGroup(self, group);

    bn_obj = ossl_bn_new(NULL);
    bn = GetBNPtr(bn_obj);

    if (EC_GROUP_get_cofactor(group, bn, ossl_bn_ctx) != 1)
        ossl_raise(eEC_GROUP, "EC_GROUP_get_cofactor");

    return bn_obj;
}

#curve_name ⇒ String

Returns the curve name (sn).

See the OpenSSL documentation for EC_GROUP_get_curve_name()

Returns:

  • (String) 


986
987
988
989
990
991
992
993
994
995
996
997
998
999
 
# File 'ext/openssl/ossl_pkey_ec.c', line 986

static VALUE ossl_ec_group_get_curve_name(VALUE self)
{
    EC_GROUP *group = NULL;
    int nid;

    GetECGroup(self, group);
    if (group == NULL)
        return Qnil;

    nid = EC_GROUP_get_curve_name(group);

/* BUG: an nid or asn1 object should be returned, maybe. */
    return rb_str_new2(OBJ_nid2sn(nid));
}

#degree ⇒ Integer

See the OpenSSL documentation for EC_GROUP_get_degree()

Returns:



1204
1205
1206
1207
1208
1209
1210
1211
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1204

static VALUE ossl_ec_group_get_degree(VALUE self)
{
    EC_GROUP *group = NULL;

    GetECGroup(self, group);

    return INT2NUM(EC_GROUP_get_degree(group));
}

#eql?(group2) ⇒ Boolean #==(group2) ⇒ Boolean Also known as: ==

Returns true if the two groups use the same curve and have the same parameters, false otherwise.

Returns:

  • (Boolean) 


868
869
870
871
872
873
874
875
876
877
878
879
 
# File 'ext/openssl/ossl_pkey_ec.c', line 868

static VALUE ossl_ec_group_eql(VALUE a, VALUE b)
{
    EC_GROUP *group1 = NULL, *group2 = NULL;

    GetECGroup(a, group1);
    SafeGetECGroup(b, group2);

    if (EC_GROUP_cmp(group1, group2, ossl_bn_ctx) == 1)
       return Qfalse;

    return Qtrue;
}

#generator ⇒ Object

Returns the generator of the group.

See the OpenSSL documentation for EC_GROUP_get0_generator()



889
890
891
892
893
894
895
896
897
898
899
900
 
# File 'ext/openssl/ossl_pkey_ec.c', line 889

static VALUE ossl_ec_group_get_generator(VALUE self)
{
    EC_GROUP *group;
    const EC_POINT *generator;

    GetECGroup(self, group);
    generator = EC_GROUP_get0_generator(group);
    if (!generator)
	return Qnil;

    return ec_point_new(generator, group);
}

#get_order ⇒ Object

Returns the order of the group.

See the OpenSSL documentation for EC_GROUP_get_order()



936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
 
# File 'ext/openssl/ossl_pkey_ec.c', line 936

static VALUE ossl_ec_group_get_order(VALUE self)
{
    VALUE bn_obj;
    BIGNUM *bn;
    EC_GROUP *group = NULL;

    GetECGroup(self, group);

    bn_obj = ossl_bn_new(NULL);
    bn = GetBNPtr(bn_obj);

    if (EC_GROUP_get_order(group, bn, ossl_bn_ctx) != 1)
        ossl_raise(eEC_GROUP, "EC_GROUP_get_order");

    return bn_obj;
}

#point_conversion_form ⇒ Symbol

Returns the form how EC::Point data is encoded as ASN.1.

See also #point_conversion_form=.

Returns:

  • (Symbol) 


1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1089

static VALUE ossl_ec_group_get_point_conversion_form(VALUE self)
{
    EC_GROUP *group = NULL;
    point_conversion_form_t form;
    VALUE ret;

    GetECGroup(self, group);
    form = EC_GROUP_get_point_conversion_form(group);

    switch (form) {
    case POINT_CONVERSION_UNCOMPRESSED:	ret = ID_uncompressed; break;
    case POINT_CONVERSION_COMPRESSED:	ret = ID_compressed; break;
    case POINT_CONVERSION_HYBRID:	ret = ID_hybrid; break;
    default:	ossl_raise(eEC_GROUP, "unsupported point conversion form: %d, this module should be updated", form);
    }

   return ID2SYM(ret);
}

#point_conversion_form=(form) ⇒ Object

Sets the form how EC::Point data is encoded as ASN.1 as defined in X9.62.

format can be one of these:

:compressed

Encoded as z||x, where z is an octet indicating which solution of the equation y is. z will be 0x02 or 0x03.

:uncompressed

Encoded as z||x||y, where z is an octet 0x04.

:hybrid

Encodes as z||x||y, where z is an octet indicating which solution of the equation y is. z will be 0x06 or 0x07.

See the OpenSSL documentation for EC_GROUP_set_point_conversion_form()



1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1143

static VALUE
ossl_ec_group_set_point_conversion_form(VALUE self, VALUE form_v)
{
    EC_GROUP *group;
    point_conversion_form_t form;

    GetECGroup(self, group);
    form = parse_point_conversion_form_symbol(form_v);

    EC_GROUP_set_point_conversion_form(group, form);

    return form_v;
}

#seed ⇒ String?

See the OpenSSL documentation for EC_GROUP_get0_seed()

Returns:

  • (String, nil) 


1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1163

static VALUE ossl_ec_group_get_seed(VALUE self)
{
    EC_GROUP *group = NULL;
    size_t seed_len;

    GetECGroup(self, group);
    seed_len = EC_GROUP_get_seed_len(group);

    if (seed_len == 0)
        return Qnil;

    return rb_str_new((const char *)EC_GROUP_get0_seed(group), seed_len);
}

#seed=(seed) ⇒ Object

See the OpenSSL documentation for EC_GROUP_set_seed()



1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1183

static VALUE ossl_ec_group_set_seed(VALUE self, VALUE seed)
{
    EC_GROUP *group = NULL;

    GetECGroup(self, group);
    StringValue(seed);

    if (EC_GROUP_set_seed(group, (unsigned char *)RSTRING_PTR(seed), RSTRING_LEN(seed)) != (size_t)RSTRING_LEN(seed))
        ossl_raise(eEC_GROUP, "EC_GROUP_set_seed");

    return seed;
}

#set_generator(generator, order, cofactor) ⇒ self

Sets the curve parameters. generator must be an instance of EC::Point that is on the curve. order and cofactor are integers.

See the OpenSSL documentation for EC_GROUP_set_generator()

Returns:

  • (self) 


911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
 
# File 'ext/openssl/ossl_pkey_ec.c', line 911

static VALUE ossl_ec_group_set_generator(VALUE self, VALUE generator, VALUE order, VALUE cofactor)
{
    EC_GROUP *group = NULL;
    const EC_POINT *point;
    const BIGNUM *o, *co;

    GetECGroup(self, group);
    SafeGetECPoint(generator, point);
    o = GetBNPtr(order);
    co = GetBNPtr(cofactor);

    if (EC_GROUP_set_generator(group, point, o, co) != 1)
        ossl_raise(eEC_GROUP, "EC_GROUP_set_generator");

    return self;
}

#to_der ⇒ String

See the OpenSSL documentation for i2d_ECPKParameters_bio()

Returns:

  • (String) 


1264
1265
1266
1267
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1264

static VALUE ossl_ec_group_to_der(VALUE self)
{
    return ossl_ec_group_to_string(self, EXPORT_DER);
}

#to_pem ⇒ String

See the OpenSSL documentation for PEM_write_bio_ECPKParameters()

Returns:

  • (String) 


1253
1254
1255
1256
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1253

static VALUE ossl_ec_group_to_pem(VALUE self)
{
    return ossl_ec_group_to_string(self, EXPORT_PEM);
}

#to_text ⇒ String

See the OpenSSL documentation for ECPKParameters_print()

Returns:

  • (String) 


1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
 
# File 'ext/openssl/ossl_pkey_ec.c', line 1275

static VALUE ossl_ec_group_to_text(VALUE self)
{
    EC_GROUP *group;
    BIO *out;
    VALUE str;

    GetECGroup(self, group);
    if (!(out = BIO_new(BIO_s_mem()))) {
	ossl_raise(eEC_GROUP, "BIO_new(BIO_s_mem())");
    }
    if (!ECPKParameters_print(out, group, 0)) {
	BIO_free(out);
	ossl_raise(eEC_GROUP, NULL);
    }
    str = ossl_membio2str(out);

    return str;
}