class OpenSSL::PKey::EC

OpenSSL::PKey::EC provides access to Elliptic Curve Digital Signature Algorithm (ECDSA) and Elliptic Curve Diffie-Hellman (ECDH).

Key exchange

ec1 = OpenSSL::PKey::EC.generate("prime256v1")
ec2 = OpenSSL::PKey::EC.generate("prime256v1")
# ec1 and ec2 have own private key respectively
shared_key1 = ec1.dh_compute_key(ec2.public_key)
shared_key2 = ec2.dh_compute_key(ec1.public_key)

p shared_key1 == shared_key2 #=> true

Constants

EXPLICIT_CURVE
NAMED_CURVE

Public Class Methods

builtin_curves → [[sn, comment], ...] click to toggle source

Obtains a list of all predefined curves by the OpenSSL. Curve names are returned as sn.

See the OpenSSL documentation for EC_get_builtin_curves().

static VALUE ossl_s_builtin_curves(VALUE self)
{
    EC_builtin_curve *curves = NULL;
    int n;
    int crv_len = rb_long2int(EC_get_builtin_curves(NULL, 0));
    VALUE ary, ret;

    curves = ALLOCA_N(EC_builtin_curve, crv_len);
    if (curves == NULL)
        return Qnil;
    if (!EC_get_builtin_curves(curves, crv_len))
        ossl_raise(rb_eRuntimeError, "EC_get_builtin_curves");

    ret = rb_ary_new2(crv_len);

    for (n = 0; n < crv_len; n++) {
        const char *sname = OBJ_nid2sn(curves[n].nid);
        const char *comment = curves[n].comment;

        ary = rb_ary_new2(2);
        rb_ary_push(ary, rb_str_new2(sname));
        rb_ary_push(ary, comment ? rb_str_new2(comment) : Qnil);
        rb_ary_push(ret, ary);
    }

    return ret;
}
generate(ec_group) → ec click to toggle source
generate(string) → ec

Creates a new EC instance with a new random private and public key.

static VALUE
ossl_ec_key_s_generate(VALUE klass, VALUE arg)
{
    EVP_PKEY *pkey;
    EC_KEY *ec;
    VALUE obj;

    obj = rb_obj_alloc(klass);
    GetPKey(obj, pkey);

    ec = ec_key_new_from_group(arg);
    if (!EVP_PKEY_assign_EC_KEY(pkey, ec)) {
        EC_KEY_free(ec);
        ossl_raise(eECError, "EVP_PKEY_assign_EC_KEY");
    }
    if (!EC_KEY_generate_key(ec))
        ossl_raise(eECError, "EC_KEY_generate_key");

    return obj;
}
OpenSSL::PKey::EC.new click to toggle source
OpenSSL::PKey::EC.new(ec_key)
OpenSSL::PKey::EC.new(ec_group)
OpenSSL::PKey::EC.new("secp112r1")
OpenSSL::PKey::EC.new(pem_string [, pwd])
OpenSSL::PKey::EC.new(der_string)

Creates a new EC object from given arguments.

static VALUE ossl_ec_key_initialize(int argc, VALUE *argv, VALUE self)
{
    EVP_PKEY *pkey;
    EC_KEY *ec = NULL;
    VALUE arg, pass;

    GetPKey(self, pkey);
    if (EVP_PKEY_base_id(pkey) != EVP_PKEY_NONE)
        ossl_raise(eECError, "EC_KEY already initialized");

    rb_scan_args(argc, argv, "02", &arg, &pass);

    if (NIL_P(arg)) {
        if (!(ec = EC_KEY_new()))
            ossl_raise(eECError, NULL);
    } else if (rb_obj_is_kind_of(arg, cEC)) {
        EC_KEY *other_ec = NULL;

        GetEC(arg, other_ec);
        if (!(ec = EC_KEY_dup(other_ec)))
            ossl_raise(eECError, NULL);
    } else if (rb_obj_is_kind_of(arg, cEC_GROUP)) {
        ec = ec_key_new_from_group(arg);
    } else {
        BIO *in = ossl_obj2bio(&arg);
        EVP_PKEY *tmp;
        pass = ossl_pem_passwd_value(pass);
        tmp = ossl_pkey_read_generic(in, pass);
        if (tmp) {
            if (EVP_PKEY_base_id(tmp) != EVP_PKEY_EC)
                rb_raise(eECError, "incorrect pkey type: %s",
                         OBJ_nid2sn(EVP_PKEY_base_id(tmp)));
            ec = EVP_PKEY_get1_EC_KEY(tmp);
            EVP_PKEY_free(tmp);
        }
        BIO_free(in);

        if (!ec) {
            ossl_clear_error();
            ec = ec_key_new_from_group(arg);
        }
    }

    if (!EVP_PKEY_assign_EC_KEY(pkey, ec)) {
        EC_KEY_free(ec);
        ossl_raise(eECError, "EVP_PKEY_assign_EC_KEY");
    }

    return self;
}

Public Instance Methods

check_key → true click to toggle source

Raises an exception if the key is invalid.

See also the man page EVP_PKEY_public_check(3).

static VALUE ossl_ec_key_check_key(VALUE self)
{
#ifdef HAVE_EVP_PKEY_CHECK
    EVP_PKEY *pkey;
    EVP_PKEY_CTX *pctx;
    int ret;

    GetPKey(self, pkey);
    pctx = EVP_PKEY_CTX_new(pkey, /* engine */NULL);
    if (!pctx)
        ossl_raise(eDHError, "EVP_PKEY_CTX_new");
    ret = EVP_PKEY_public_check(pctx);
    EVP_PKEY_CTX_free(pctx);
    if (ret != 1)
        ossl_raise(eECError, "EVP_PKEY_public_check");
#else
    EC_KEY *ec;

    GetEC(self, ec);
    if (EC_KEY_check_key(ec) != 1)
        ossl_raise(eECError, "EC_KEY_check_key");
#endif

    return Qtrue;
}
dh_compute_key(pubkey) → string click to toggle source

Derives a shared secret by ECDH. pubkey must be an instance of OpenSSL::PKey::EC::Point and must belong to the same group.

This method is provided for backwards compatibility, and calls derive internally.

# File ext/openssl/lib/openssl/pkey.rb, line 251
def dh_compute_key(pubkey)
  peer = OpenSSL::PKey::EC.new(group)
  peer.public_key = pubkey
  derive(peer)
end
dsa_sign_asn1(data) → String click to toggle source

Deprecated in version 3.0. Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.

# File ext/openssl/lib/openssl/pkey.rb, line 226
def dsa_sign_asn1(data)
  sign_raw(nil, data)
rescue OpenSSL::PKey::PKeyError
  raise OpenSSL::PKey::ECError, $!.message
end
dsa_verify_asn1(data, sig) → true | false click to toggle source

Deprecated in version 3.0. Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.

# File ext/openssl/lib/openssl/pkey.rb, line 237
def dsa_verify_asn1(data, sig)
  verify_raw(nil, sig, data)
rescue OpenSSL::PKey::PKeyError
  raise OpenSSL::PKey::ECError, $!.message
end
export([cipher, pass_phrase]) → String click to toggle source

Outputs the EC key in PEM encoding. If cipher and pass_phrase are given they will be used to encrypt the key. cipher must be an OpenSSL::Cipher instance. Note that encryption will only be effective for a private key, public keys will always be encoded in plain text.

static VALUE
ossl_ec_key_export(int argc, VALUE *argv, VALUE self)
{
    EC_KEY *ec;

    GetEC(self, ec);
    if (EC_KEY_get0_private_key(ec))
        return ossl_pkey_export_traditional(argc, argv, self, 0);
    else
        return ossl_pkey_export_spki(self, 0);
}
Also aliased as: to_pem

Generates a new random private and public key.

See also the OpenSSL documentation for EC_KEY_generate_key()

Example

ec = OpenSSL::PKey::EC.new("prime256v1")
p ec.private_key # => nil
ec.generate_key!
p ec.private_key # => #<OpenSSL::BN XXXXXX>
Alias for: generate_key!

Generates a new random private and public key.

See also the OpenSSL documentation for EC_KEY_generate_key()

Example

ec = OpenSSL::PKey::EC.new("prime256v1")
p ec.private_key # => nil
ec.generate_key!
p ec.private_key # => #<OpenSSL::BN XXXXXX>
static VALUE ossl_ec_key_generate_key(VALUE self)
{
    EC_KEY *ec;

    GetEC(self, ec);
    if (EC_KEY_generate_key(ec) != 1)
        ossl_raise(eECError, "EC_KEY_generate_key");

    return self;
}
Also aliased as: generate_key
group → group click to toggle source

Returns the EC::Group that the key is associated with. Modifying the returned group does not affect key.

static VALUE
ossl_ec_key_get_group(VALUE self)
{
    EC_KEY *ec;
    const EC_GROUP *group;

    GetEC(self, ec);
    group = EC_KEY_get0_group(ec);
    if (!group)
        return Qnil;

    return ec_group_new(group);
}
group = group click to toggle source

Sets the EC::Group for the key. The group structure is internally copied so modification to group after assigning to a key has no effect on the key.

static VALUE
ossl_ec_key_set_group(VALUE self, VALUE group_v)
{
    EC_KEY *ec;
    EC_GROUP *group;

    GetEC(self, ec);
    GetECGroup(group_v, group);

    if (EC_KEY_set_group(ec, group) != 1)
        ossl_raise(eECError, "EC_KEY_set_group");

    return group_v;
}
initialize_copy(p1) click to toggle source
static VALUE
ossl_ec_key_initialize_copy(VALUE self, VALUE other)
{
    EVP_PKEY *pkey;
    EC_KEY *ec, *ec_new;

    GetPKey(self, pkey);
    if (EVP_PKEY_base_id(pkey) != EVP_PKEY_NONE)
        ossl_raise(eECError, "EC already initialized");
    GetEC(other, ec);

    ec_new = EC_KEY_dup(ec);
    if (!ec_new)
        ossl_raise(eECError, "EC_KEY_dup");
    if (!EVP_PKEY_assign_EC_KEY(pkey, ec_new)) {
        EC_KEY_free(ec_new);
        ossl_raise(eECError, "EVP_PKEY_assign_EC_KEY");
    }

    return self;
}
private? → true or false click to toggle source

Returns whether this EC instance has a private key. The private key (BN) can be retrieved with EC#private_key.

static VALUE ossl_ec_key_is_private(VALUE self)
{
    EC_KEY *ec;

    GetEC(self, ec);

    return EC_KEY_get0_private_key(ec) ? Qtrue : Qfalse;
}
Also aliased as: private_key?
private_key → OpenSSL::BN click to toggle source

See the OpenSSL documentation for EC_KEY_get0_private_key()

static VALUE ossl_ec_key_get_private_key(VALUE self)
{
    EC_KEY *ec;
    const BIGNUM *bn;

    GetEC(self, ec);
    if ((bn = EC_KEY_get0_private_key(ec)) == NULL)
        return Qnil;

    return ossl_bn_new(bn);
}
private_key = openssl_bn click to toggle source

See the OpenSSL documentation for EC_KEY_set_private_key()

static VALUE ossl_ec_key_set_private_key(VALUE self, VALUE private_key)
{
    EC_KEY *ec;
    BIGNUM *bn = NULL;

    GetEC(self, ec);
    if (!NIL_P(private_key))
        bn = GetBNPtr(private_key);

    switch (EC_KEY_set_private_key(ec, bn)) {
    case 1:
        break;
    case 0:
        if (bn == NULL)
            break;
    default:
        ossl_raise(eECError, "EC_KEY_set_private_key");
    }

    return private_key;
}

Returns whether this EC instance has a private key. The private key (BN) can be retrieved with EC#private_key.

Alias for: private?
public? → true or false click to toggle source

Returns whether this EC instance has a public key. The public key (EC::Point) can be retrieved with EC#public_key.

static VALUE ossl_ec_key_is_public(VALUE self)
{
    EC_KEY *ec;

    GetEC(self, ec);

    return EC_KEY_get0_public_key(ec) ? Qtrue : Qfalse;
}
Also aliased as: public_key?
public_key → OpenSSL::PKey::EC::Point click to toggle source

See the OpenSSL documentation for EC_KEY_get0_public_key()

static VALUE ossl_ec_key_get_public_key(VALUE self)
{
    EC_KEY *ec;
    const EC_POINT *point;

    GetEC(self, ec);
    if ((point = EC_KEY_get0_public_key(ec)) == NULL)
        return Qnil;

    return ec_point_new(point, EC_KEY_get0_group(ec));
}
public_key = ec_point click to toggle source

See the OpenSSL documentation for EC_KEY_set_public_key()

static VALUE ossl_ec_key_set_public_key(VALUE self, VALUE public_key)
{
    EC_KEY *ec;
    EC_POINT *point = NULL;

    GetEC(self, ec);
    if (!NIL_P(public_key))
        GetECPoint(public_key, point);

    switch (EC_KEY_set_public_key(ec, point)) {
    case 1:
        break;
    case 0:
        if (point == NULL)
            break;
    default:
        ossl_raise(eECError, "EC_KEY_set_public_key");
    }

    return public_key;
}

Returns whether this EC instance has a public key. The public key (EC::Point) can be retrieved with EC#public_key.

Alias for: public?
to_der → String click to toggle source

See the OpenSSL documentation for i2d_ECPrivateKey_bio()

static VALUE
ossl_ec_key_to_der(VALUE self)
{
    EC_KEY *ec;

    GetEC(self, ec);
    if (EC_KEY_get0_private_key(ec))
        return ossl_pkey_export_traditional(0, NULL, self, 1);
    else
        return ossl_pkey_export_spki(self, 1);
}
to_pem([cipher, pass_phrase]) → String

Outputs the EC key in PEM encoding. If cipher and pass_phrase are given they will be used to encrypt the key. cipher must be an OpenSSL::Cipher instance. Note that encryption will only be effective for a private key, public keys will always be encoded in plain text.

Alias for: export