digisig

README

digisig

Digital Signure Scheme

This is an implementation of the Schnorr signature based on Linear groups. For the linear groups, see RFC-3526.

https://godoc.org/github.com/mad-day/digisig

package main

import "io"
import "fmt"
import "github.com/mad-day/digisig"

import "golang.org/x/crypto/sha3"

import "golang.org/x/crypto/blake2b"
import "github.com/mad-day/digisig/blake2butil"

func Message(f io.Writer) {
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
}

func Message2(f io.Writer) {
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World.")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
	fmt.Fprintln(f,"Hello World!")
}

func main() {
	random := sha3.NewShake256()
	random.Write([]byte("12345"))
	pk,e := new(digisig.PrivateKey).SetGroup(digisig.Modp18).Generate(random)
	if e!=nil { fmt.Println(e); return }
	pub := pk.PublicKey()
	
	sig,e := digisig.NewSigner(pk,blake2b.New512,blake2butil.PreKey,random)
	if e!=nil { fmt.Println(e); return }
	
	Message(sig)
	E,S := sig.Sign()
	//fmt.Printf("E=%x\nS=%x\n",E,S)
	
	ver,e := digisig.NewVerifier(E,S,pub,blake2b.New512,blake2butil.PreKey)
	if e!=nil { fmt.Println(e); return }
	Message(ver)
	E2,ok := ver.Verify()
	
	fmt.Println()
	fmt.Println()
	fmt.Println()
	fmt.Printf("E=%x\nS=%x\n",E,S)
	fmt.Printf("E=%x\nok=%v\n",E2,ok)
	
	//fmt.Println(pk)
	//fmt.Println(pub)
}

Documentation

Index

• Constants
• type MAC
• type Prek
• type PrivateKey
  • func (p *PrivateKey) Generate(r io.Reader) (*PrivateKey, error)
  • func (p *PrivateKey) PublicKey() *PublicKey
  • func (p *PrivateKey) SetGroup(g int) *PrivateKey
  • func (p *PrivateKey) String() string
• type PublicKey
  • func (p *PublicKey) Base() *PublicKey
  • func (p *PublicKey) Exp(i *big.Int) *PublicKey
  • func (p *PublicKey) ModInverse() *PublicKey
  • func (p *PublicKey) Mul(o *PublicKey) *PublicKey
  • func (p *PublicKey) String() string
• type Signer
  • func NewSigner(priv *PrivateKey, mac MAC, prep Prek, ra io.Reader) (*Signer, error)
  • func (s *Signer) Sign() (E *big.Int, S *big.Int)
• type Verifier
  • func NewVerifier(E, S *big.Int, pub *PublicKey, mac MAC, prep Prek) (v *Verifier, err error)
  • func (v *Verifier) Verify() (*big.Int, bool)

Constants

const (
	Modp5  = 5  /* 1536-bit MODP Group */
	Modp14 = 14 /* 2048-bit MODP Group */
	Modp15 = 15 /* 3072-bit MODP Group */
	Modp16 = 16 /* 4096-bit MODP Group */
	Modp17 = 17 /* 6144-bit MODP Group */
	Modp18 = 18 /* 8192-bit MODP Group */
)

Types

type MAC

type MAC func(key []byte) (hash.Hash, error)

type Prek

type Prek func(key []byte) []byte

nil will result in "func(key []byte) []byte { return key }"

type PrivateKey

type PrivateKey struct {
	Group  int
	Secret *big.Int
}

func (*PrivateKey) Generate

func (p *PrivateKey) Generate(r io.Reader) (*PrivateKey, error)

func (*PrivateKey) PublicKey

func (p *PrivateKey) PublicKey() *PublicKey

func (*PrivateKey) SetGroup

func (p *PrivateKey) SetGroup(g int) *PrivateKey

func (*PrivateKey) String

func (p *PrivateKey) String() string

type PublicKey

type PublicKey struct {
	Group  int
	Public *big.Int
}

func (*PublicKey) Base

func (p *PublicKey) Base() *PublicKey

func (*PublicKey) Exp

func (p *PublicKey) Exp(i *big.Int) *PublicKey

func (*PublicKey) ModInverse

func (p *PublicKey) ModInverse() *PublicKey

func (*PublicKey) Mul

func (p *PublicKey) Mul(o *PublicKey) *PublicKey

func (*PublicKey) String

func (p *PublicKey) String() string

type Signer

type Signer struct {
	io.Writer
	// contains filtered or unexported fields
}

func NewSigner

func NewSigner(priv *PrivateKey, mac MAC, prep Prek, ra io.Reader) (*Signer, error)

func (*Signer) Sign

func (s *Signer) Sign() (E *big.Int, S *big.Int)

type Verifier

type Verifier struct {
	io.Writer
	// contains filtered or unexported fields
}

func NewVerifier

func NewVerifier(E, S *big.Int, pub *PublicKey, mac MAC, prep Prek) (v *Verifier, err error)

func (*Verifier) Verify

func (v *Verifier) Verify() (*big.Int, bool)