Discription

it is a BBS04 signature lib for golang

How to install the lib

First :install the GMP

This package must be compiled using cgo. It also requires the installation of GMP and PBC. During the build process, this package will attempt to include <gmp.h> and <pbc/pbc.h>, and then dynamically link to GMP and PBC.

Most systems include a package for GMP. To install GMP in Debian / Ubuntu:

sudo apt-get install libgmp-dev

For an RPM installation with YUM:

sudo yum install gmp-devel

For installation with Fink (http://www.finkproject.org/) on Mac OS X:

sudo fink install gmp gmp-shlibs

For more information or to compile from source, visit https://gmplib.org/

Second:install the PBC

To install the PBC library, download the appropriate files for your system from https://crypto.stanford.edu/pbc/download.html. PBC has three dependencies: the gcc compiler, flex (http://flex.sourceforge.net/), and bison (https://www.gnu.org/software/bison/). See the respective sites for installation instructions. Most distributions include packages for these libraries. For example, in Debian / Ubuntu:

sudo apt-get install build-essential flex bison

The PBC source can be compiled and installed using the usual GNU Build System:

./configure
make
sudo make install

After installing, you may need to rebuild the search path for libraries:

sudo ldconfig

It is possible to install the package on Windows through the use of MinGW and MSYS. MSYS is required for installing PBC, while GMP can be installed through a package. Based on your MinGW installation, you may need to add "-I/usr/local/include" to CPPFLAGS and "-L/usr/local/lib" to LDFLAGS when building PBC. Likewise, you may need to add these options toCGO_CPPFLAGSand CGO_LDFLAGS when installing this package.

and then install the golang pbc lib

go get github.com/Nik-U/pbc

Third: install the BBS04 signature golang lib

download the bbs04 signature lib

go get go get github.com/yunfeiyangbuaa/BBS04_signature

and imprt in your code

import "github.com/yunfeiyangbuaa/BBS04_signature"

How to use

Exmple

func  main(){
   params:=pbc.GenerateA(160,512)
   pairing:=params.NewPairing()
   g1:=pairing.NewG1().Rand()
   g2:=pairing.NewG2().Rand()
   priv:=GenerateGroup(g1,g2 ,pairing)
   //genarate  new  member
   member:=priv.NewMember()
   //generate  new  cert
   cert:=priv.Cert(member.u_)
   fmt.Println(cert.A.String())

   member1:=priv.NewMember()
   cert1:=priv.Cert(member1.u_)
   fmt.Println(cert1.A.String())

   //verify  cert
   member.Verify_cert(cert)
   member1.Verify_cert(cert1)
   //generate   mima
   c1:=pairing.NewG1().Rand()
   c2:=pairing.NewG1().Rand()
   c3:=pairing.NewG1().Mul(c1,c2)
   //generate  signature
   sig:=member.Sign(cert,c1,c2,c3)
   sig1:=member1.Sign(cert1,c1,c2,c3)
   //verify    signature
   priv.Group.Verify_sign(sig,member.h_)
   priv.Group.Verify_sign(sig1,member1.h_)
   priv.open(sig)
   priv.open(sig1)
}

Function

func (member *MemberKey) Verify_cert(cert *Cert)bool
func GenerateGroup(g_1,g_2  *pbc.Element,pairing_ *pbc.Pairing) (*PrivateKey)
func (g *Group) precompute() 
func (priv *PrivateKey) NewMember() (*MemberKey)
func (priv *PrivateKey)Cert(u3  *pbc.Element)(*Cert)
func (priv  *PrivateKey)open(sig  *Sig)*pbc.Element
func (g *Group) Verify_sign(sig  *Sig,h3 *pbc.Element) bool
func (mem *MemberKey) Sign(cert  *Cert,c1,c2,c3  *pbc.Element) (*Sig)