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100 lines
4.1 KiB
100 lines
4.1 KiB
14 years ago
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//////////////////////////////////////////////////////////////////////////////////
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// Name: actToolsECC.h
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// Product: cv act library
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// Purpose: useful ECC functions
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//
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// Copyright: (c) 2009 cv cryptovision GmbH
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// all rights reserved
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// Licence: The conditions for the use of this software are regulated
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// in the cv act library licence agreement.
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//////////////////////////////////////////////////////////////////////////////////
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#ifndef ACT_ToolsECC_h
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#define ACT_ToolsECC_h
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#include "actMode.h"
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#include "actBlob.h"
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#include "actIKey.h"
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namespace act
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{
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// Functions for ECC scalar multiplication, addition of points.
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// Input points must be in ASN.1 point representation (uncompressed,
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// compressed or hybrid). The output point will be in ASN.1 representation
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// as indicated in 'output_format'.
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//
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// 1) Calculate s * Q, s unsigned in ASN.1 OCTET STRING representation
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// (leading zeros will be ignored)
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Blob ECMultiplyPoint(IKey* ec_key, const Blob& s, const Blob& Q,
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int output_format = UNCOMPRESSED);
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// 2) Calculate Q1 + Q2
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Blob ECAddPoints(IKey* ec_key, const Blob& Q1, const Blob& Q2,
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int output_format = UNCOMPRESSED);
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// Functions to encode an (EC-)DSA signature (r, s) in ASN1 format and backwards.
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//
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// 1) Plain signature I/O as string
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// - for encode: r and s must be in hex notation
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// - for decode: the user has to allocate r and s buffers
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void EncodeSignature(const char* r, const char* s, Blob& signature_ASN1);
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void DecodeSignature(const Blob& signature_ASN1, char* r, char* s);
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// 2) Plain signature I/O as byte array (Blob)
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// - r and s I/O in big endian representation
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void EncodeSignature(const Blob& r, const Blob& s, Blob& signature_ASN1);
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void DecodeSignature(const Blob& signature_ASN1, Blob& r, Blob& s);
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// 3) Plain signature I/O as byte array (Blob)
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// - r_s length even, left haft = r, right half = s
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// - if order_bytes is non zero, decode output length is 2 * order_bytes
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void EncodeSignature(const Blob& r_s, Blob& signature_ASN1);
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void DecodeSignature(const Blob& signature_ASN1, Blob& r_s, size_t order_bytes = 0);
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// Tools for elliptic curves over GF(P).
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// The basepoint can be given by it's coordinates (Gx, Gy) or as
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// COMPRESSED, UNCOMPRESSED or HYBRID octetstring G corresponding
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// to ANSI X9.62/63 standard.
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// By default, the basepoint will be encoded in UNCOMPRESSED format.
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Blob EncodePrimeCurveParam(const Blob& p, const Blob& a, const Blob& b,
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const Blob& Gx, const Blob& Gy, const Blob& n, const Blob& h,
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int output_type = UNCOMPRESSED);
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Blob EncodePrimeCurveParam(const Blob& p, const Blob& a, const Blob& b,
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const Blob& G, const Blob& n, const Blob& h, int output_type = UNCOMPRESSED);
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// dto. for elliptic curves over GF(2^m), tri- or pentanomial basis.
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// tri- or pentanomial in hex presentation
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Blob EncodeGF2CurveParam(const Blob& p, const Blob& a, const Blob& b,
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const Blob& Gx, const Blob& Gy, const Blob& n, const Blob& h,
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int output_type = UNCOMPRESSED);
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// tri- or pentanomial in hex presentation
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Blob EncodeGF2CurveParam(const Blob& p, const Blob& a, const Blob& b,
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const Blob& G, const Blob& n, const Blob& h, int output_type = UNCOMPRESSED);
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// f(t) = t^m + t^k + 1
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Blob EncodeTrinomialCurveParam(const int m, const int k,
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const Blob& a, const Blob& b, const Blob& Gx, const Blob& Gy,
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const Blob& n, const Blob& h, int output_type = UNCOMPRESSED);
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// f(t) = t^m + t^k + 1
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Blob EncodeTrinomialCurveParam(const int m, const int k,
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const Blob& a, const Blob& b, const Blob& G, const Blob& n,
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const Blob& h, int output_type = UNCOMPRESSED);
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// f(t) = t^m + t^k3 + t^k2 + t^k1 + 1
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Blob EncodePentanomialCurveParam(const int m, const int k3, const int k2,
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const int k1, const Blob& a, const Blob& b, const Blob& Gx, const Blob& Gy,
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const Blob& n, const Blob& h, int output_type = UNCOMPRESSED);
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// f(t) = t^m + t^k3 + t^k2 + t^k1 + 1
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Blob EncodePentanomialCurveParam(const int m, const int k3, const int k2,
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const int k1, const Blob& a, const Blob& b, const Blob& G,
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const Blob& n, const Blob& h, int output_type = UNCOMPRESSED);
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} // namespace act
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#endif // ACT_ToolsECC_h
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