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August 27, 2020 07:50
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Golang : Example for ECDSA(Elliptic Curve Digital Signature Algorithm) package functions
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| // https://www.socketloop.com/tutorials/golang-example-for-ecdsa-elliptic-curve-digital-signature-algorithm-functions | |
| package main | |
| import ( | |
| "crypto/ecdsa" | |
| "crypto/elliptic" | |
| "crypto/md5" | |
| "crypto/rand" | |
| "fmt" | |
| "hash" | |
| "io" | |
| "math/big" | |
| "os" | |
| ) | |
| func main() { | |
| pubkeyCurve := elliptic.P256() //see http://golang.org/pkg/crypto/elliptic/#P256 | |
| privatekey := new(ecdsa.PrivateKey) | |
| privatekey, err := ecdsa.GenerateKey(pubkeyCurve, rand.Reader) // this generates a public & private key pair | |
| if err != nil { | |
| fmt.Println(err) | |
| os.Exit(1) | |
| } | |
| var pubkey ecdsa.PublicKey | |
| pubkey = privatekey.PublicKey | |
| fmt.Println("Private Key :") | |
| fmt.Printf("%x \n", privatekey) | |
| fmt.Println("Public Key :") | |
| fmt.Printf("%x \n", pubkey) | |
| // Sign ecdsa style | |
| var h hash.Hash | |
| h = md5.New() | |
| r := big.NewInt(0) | |
| s := big.NewInt(0) | |
| io.WriteString(h, "This is a message to be signed and verified by ECDSA!") | |
| signhash := h.Sum(nil) | |
| r, s, serr := ecdsa.Sign(rand.Reader, privatekey, signhash) | |
| if serr != nil { | |
| fmt.Println(err) | |
| os.Exit(1) | |
| } | |
| signature := r.Bytes() | |
| signature = append(signature, s.Bytes()...) | |
| fmt.Printf("Signature : %x\n", signature) | |
| // Verify | |
| verifystatus := ecdsa.Verify(&pubkey, signhash, r, s) | |
| fmt.Println(verifystatus) // should be true | |
| } |
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