diff options
Diffstat (limited to 'src/pubkey/ec_group/ec_group.h')
-rw-r--r-- | src/pubkey/ec_group/ec_group.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/pubkey/ec_group/ec_group.h b/src/pubkey/ec_group/ec_group.h new file mode 100644 index 000000000..b7b09985e --- /dev/null +++ b/src/pubkey/ec_group/ec_group.h @@ -0,0 +1,143 @@ +/* +* ECC Domain Parameters +* +* (C) 2007 Falko Strenzke, FlexSecure GmbH +* 2008-2010 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_ECC_DOMAIN_PARAMETERS_H__ +#define BOTAN_ECC_DOMAIN_PARAMETERS_H__ + +#include <botan/point_gfp.h> +#include <botan/curve_gfp.h> +#include <botan/asn1_oid.h> + +namespace Botan { + +/** +* This class represents elliptic curce domain parameters +*/ +enum EC_Group_Encoding { + EC_DOMPAR_ENC_EXPLICIT = 0, + EC_DOMPAR_ENC_IMPLICITCA = 1, + EC_DOMPAR_ENC_OID = 2 +}; + +/** +* Class representing an elliptic curve +*/ +class BOTAN_DLL EC_Group + { + public: + + /** + * Construct Domain paramers from specified parameters + * @param curve elliptic curve + * @param base_point a base point + * @param order the order of the base point + * @param cofactor the cofactor + */ + EC_Group(const CurveGFp& curve, + const PointGFp& base_point, + const BigInt& order, + const BigInt& cofactor) : + curve(curve), + base_point(base_point), + order(order), + cofactor(cofactor), + oid("") + {} + + /** + * Decode a BER encoded ECC domain parameter set + * @param ber_encoding the bytes of the BER encoding + */ + EC_Group(const MemoryRegion<byte>& ber_encoding); + + /** + * Create an EC domain by OID (or throw if unknown) + * @param oid the OID of the EC domain to create + */ + EC_Group(const OID& oid); + + /** + * Create an EC domain from PEM encoding (as from PEM_encode), + * or from an OID name (eg "secp16r1", or "1.3.132.0.8") + * @param pem_or_oid PEM-encoded data, or an OID + */ + EC_Group(const std::string& pem_or_oid = ""); + + /** + * Create the DER encoding of this domain + * @param form of encoding to use + * @returns bytes encododed as DER + */ + SecureVector<byte> DER_encode(EC_Group_Encoding form) const; + + /** + * Return the PEM encoding (always in explicit form) + * @return string containing PEM data + */ + std::string PEM_encode() const; + + /** + * Return domain parameter curve + * @result domain parameter curve + */ + const CurveGFp& get_curve() const { return curve; } + + /** + * Return domain parameter curve + * @result domain parameter curve + */ + const PointGFp& get_base_point() const { return base_point; } + + /** + * Return the order of the base point + * @result order of the base point + */ + const BigInt& get_order() const { return order; } + + /** + * Return the cofactor + * @result the cofactor + */ + const BigInt& get_cofactor() const { return cofactor; } + + bool initialized() const { return !base_point.is_zero(); } + + /** + * Return the OID of these domain parameters + * @result the OID + */ + std::string get_oid() const { return oid; } + + bool operator==(const EC_Group& other) const + { + return ((get_curve() == other.get_curve()) && + (get_base_point() == other.get_base_point()) && + (get_order() == other.get_order()) && + (get_cofactor() == other.get_cofactor())); + } + + private: + CurveGFp curve; + PointGFp base_point; + BigInt order, cofactor; + std::string oid; + }; + +inline bool operator!=(const EC_Group& lhs, + const EC_Group& rhs) + { + return !(lhs == rhs); + } + +// For compatability with 1.8 +typedef EC_Group EC_Domain_Params; + +} + +#endif |