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ecdsa.go
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ecdsa.go
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//BSD 3-Clause License
//
//Copyright (c) 2018, jadeblaquiere
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions are met:
//
//* Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
//* Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
//* Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
//FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
//OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package ecgo
// #cgo LDFLAGS: -lecc -lgmp
// #include <ecc/ecdsa.h>
// #include <ecc/ecurve.h>
// #include <stdlib.h>
// #include <string.h>
//
// //typedef _mpECDSASignatureScheme_t *mpECDSASignatureScheme_ptr;
//
// mpECDSASignatureScheme_ptr malloc_ECDSASignatureScheme() {
// return (mpECDSASignatureScheme_ptr)malloc(sizeof(_mpECDSASignatureScheme_t));
// }
//
// void free_ECDSASignatureScheme(mpECDSASignatureScheme_ptr css) {
// free(css);
// }
//
// //typedef _mpECDSASignature_t *mpECDSASignature_ptr;
//
// mpECDSASignature_ptr malloc_ECDSASignature() {
// return (mpECDSASignature_ptr)malloc(sizeof(_mpECDSASignature_t));
// }
//
// void free_ECDSASignature(mpECDSASignature_ptr csig) {
// free(csig);
// }
//
// // this is a bit of a cheat as golang wrapper will pre-hash the message
// void cgo_dohash(unsigned char *hash, unsigned char *msg, size_t msz) {
// memcpy(hash, msg, msz);
// return;
// }
//
// extern unsigned char *_toUCP(void *p);
//
import "C"
import (
//"bytes"
//"crypto"
//"encoding/base64"
//"encoding/hex"
//"encoding/binary"
//"errors"
//"fmt"
"hash"
//"io/ioutil"
"math/big"
//"os"
//"reflect"
"runtime"
//"strconv"
//"strings"
//"time"
"unsafe"
)
type ECDSASignatureScheme struct {
css *C._mpECDSASignatureScheme_t
cv *Curve
h hash.Hash
}
type ECDSASignature struct {
csig *C._mpECDSASignature_t
ss *ECDSASignatureScheme
}
func NewECDSASignatureScheme(c *Curve, h hash.Hash) (ss *ECDSASignatureScheme) {
var hdesc C._mpECDSAHashfunc_t
ss = new(ECDSASignatureScheme)
ss.css = C.malloc_ECDSASignatureScheme()
ss.cv = c
ss.h = h
hdesc.dohash = C._ecdsa_dohash(C.cgo_dohash)
hdesc.hsz = C.size_t(h.Size())
C.mpECDSASignatureScheme_init(ss.css, c.ec, &hdesc)
runtime.SetFinalizer(ss, signaturescheme_clear)
return ss
}
func signaturescheme_clear(ss *ECDSASignatureScheme) {
C.mpECDSASignatureScheme_clear(ss.css)
C.free_ECDSASignatureScheme(ss.css)
}
func (ss *ECDSASignatureScheme) Sign(sK *big.Int, message []byte) *ECDSASignature {
ss.h.Reset()
ss.h.Write(message)
mhash := C.CBytes(ss.h.Sum(nil))
// ghash := ss.h.Sum(nil)
// fmt.Fprintf(os.Stderr, "hash = %s\n", hex.EncodeToString(ghash))
hsz := C.size_t(ss.h.Size())
sig := new(ECDSASignature)
sig.csig = C.malloc_ECDSASignature()
sKfe := NewFieldElement(sK, ss.cv.GetAttr("n"))
status := C.mpECDSASignature_init_Sign(sig.csig, ss.css, sKfe.fe, C._toUCP(mhash), hsz)
C.free(mhash)
if status != C.int(0) {
C.free_ECDSASignature(sig.csig)
return nil
}
sig.ss = ss
return sig
}
func (sig *ECDSASignature) Verify(pK *Point, message []byte) bool {
sig.ss.h.Reset()
sig.ss.h.Write(message)
mhash := C.CBytes(sig.ss.h.Sum(nil))
hsz := C.size_t(sig.ss.h.Size())
status := C.mpECDSASignature_verify_cmp(sig.csig, pK.ecp, C._toUCP(mhash), hsz)
C.free(mhash)
if status == C.int(0) {
return true
}
return false
}
func (sig *ECDSASignature) AsBytes() []byte {
var sz C.size_t
cbytes := unsafe.Pointer(C.mpECDSASignature_export_bytes(sig.csig, &sz))
gobytes := C.GoBytes(cbytes, C.int(sz))
C.memset(cbytes, 0, sz)
C.free(cbytes)
return gobytes
}
func (ss *ECDSASignatureScheme) SignatureFromBytes(gobytes []byte) *ECDSASignature {
sig := new(ECDSASignature)
sig.csig = C.malloc_ECDSASignature()
sig.ss = ss
cbytes := C.CBytes(gobytes)
sz := C.size_t(len(gobytes))
status := C.mpECDSASignature_init_import_bytes(sig.csig, ss.css, C._toUCP(cbytes), sz)
C.memset(cbytes, 0, sz)
C.free(cbytes)
if status != 0 {
C.free_ECDSASignature(sig.csig)
return nil
}
return sig
}