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example_test.go
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example_test.go
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package cose_test
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha512"
"fmt"
"github.com/veraison/go-cose"
)
// This example demonstrates signing and verifying COSE_Sign signatures.
//
// The COSE Sign API is EXPERIMENTAL and may be changed or removed in a later
// release.
func ExampleSignMessage() {
// create a signature holder
sigHolder := cose.NewSignature()
sigHolder.Headers.Protected.SetAlgorithm(cose.AlgorithmES512)
sigHolder.Headers.Unprotected[cose.HeaderLabelKeyID] = []byte("1")
// create message to be signed
msgToSign := cose.NewSignMessage()
msgToSign.Payload = []byte("hello world")
msgToSign.Signatures = append(msgToSign.Signatures, sigHolder)
// create a signer
privateKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
panic(err)
}
signer, err := cose.NewSigner(cose.AlgorithmES512, privateKey)
if err != nil {
panic(err)
}
// sign message
err = msgToSign.Sign(rand.Reader, nil, signer)
if err != nil {
panic(err)
}
sig, err := msgToSign.MarshalCBOR()
if err != nil {
panic(err)
}
fmt.Println("message signed")
// create a verifier from a trusted public key
publicKey := privateKey.Public()
verifier, err := cose.NewVerifier(cose.AlgorithmES512, publicKey)
if err != nil {
panic(err)
}
// verify message
var msgToVerify cose.SignMessage
err = msgToVerify.UnmarshalCBOR(sig)
if err != nil {
panic(err)
}
err = msgToVerify.Verify(nil, verifier)
if err != nil {
panic(err)
}
fmt.Println("message verified")
// tamper the message and verification should fail
msgToVerify.Payload = []byte("foobar")
err = msgToVerify.Verify(nil, verifier)
if err != cose.ErrVerification {
panic(err)
}
fmt.Println("verification error as expected")
// Output:
// message signed
// message verified
// verification error as expected
}
// This example demonstrates signing and verifying COSE_Sign1 signatures.
func ExampleSign1Message() {
// create message to be signed
msgToSign := cose.NewSign1Message()
msgToSign.Payload = []byte("hello world")
msgToSign.Headers.Protected.SetAlgorithm(cose.AlgorithmES512)
msgToSign.Headers.Unprotected[cose.HeaderLabelKeyID] = []byte("1")
// create a signer
privateKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
panic(err)
}
signer, err := cose.NewSigner(cose.AlgorithmES512, privateKey)
if err != nil {
panic(err)
}
// sign message
err = msgToSign.Sign(rand.Reader, nil, signer)
if err != nil {
panic(err)
}
sig, err := msgToSign.MarshalCBOR()
if err != nil {
panic(err)
}
fmt.Println("message signed")
// create a verifier from a trusted public key
publicKey := privateKey.Public()
verifier, err := cose.NewVerifier(cose.AlgorithmES512, publicKey)
if err != nil {
panic(err)
}
// verify message
var msgToVerify cose.Sign1Message
err = msgToVerify.UnmarshalCBOR(sig)
if err != nil {
panic(err)
}
err = msgToVerify.Verify(nil, verifier)
if err != nil {
panic(err)
}
fmt.Println("message verified")
// tamper the message and verification should fail
msgToVerify.Payload = []byte("foobar")
err = msgToVerify.Verify(nil, verifier)
if err != cose.ErrVerification {
panic(err)
}
fmt.Println("verification error as expected")
// Output:
// message signed
// message verified
// verification error as expected
}
// This example demonstrates signing COSE_Sign1_Tagged signatures using Sign1().
func ExampleSign1() {
// create a signer
privateKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
panic(err)
}
signer, err := cose.NewSigner(cose.AlgorithmES512, privateKey)
if err != nil {
panic(err)
}
// sign message
headers := cose.Headers{
Protected: cose.ProtectedHeader{
cose.HeaderLabelAlgorithm: cose.AlgorithmES512,
},
Unprotected: cose.UnprotectedHeader{
cose.HeaderLabelKeyID: []byte("1"),
},
}
sig, err := cose.Sign1(rand.Reader, signer, headers, []byte("hello world"), nil)
if err != nil {
panic(err)
}
fmt.Println("message signed")
_ = sig // further process on sig
// Output:
// message signed
}
// This example demonstrates signing COSE_Sign1 signatures using Sign1Untagged().
func ExampleSign1Untagged() {
// create a signer
privateKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
panic(err)
}
signer, err := cose.NewSigner(cose.AlgorithmES512, privateKey)
if err != nil {
panic(err)
}
// sign message
headers := cose.Headers{
Protected: cose.ProtectedHeader{
cose.HeaderLabelAlgorithm: cose.AlgorithmES512,
},
Unprotected: cose.UnprotectedHeader{
cose.HeaderLabelKeyID: []byte("1"),
},
}
sig, err := cose.Sign1Untagged(rand.Reader, signer, headers, []byte("hello world"), nil)
if err != nil {
panic(err)
}
fmt.Println("message signed")
_ = sig // further process on sig
// Output:
// message signed
}
func ExampleDigestSigner() {
// create a signer
privateKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
panic(err)
}
signer, err := cose.NewSigner(cose.AlgorithmES256, privateKey)
if err != nil {
panic(err)
}
digestSigner, ok := signer.(cose.DigestSigner)
if !ok {
panic("signer does not support digest signing")
}
// hash payload outside go-cose.
payload := []byte("hello world")
digested := sha512.Sum512(payload)
sig, err := digestSigner.SignDigest(rand.Reader, digested[:])
fmt.Println("digest signed")
_ = sig // further process on sig
// Output:
// digest signed
}
// This example demonstrates signing and verifying countersignatures.
//
// The COSE Countersignature API is EXPERIMENTAL and may be changed or removed in a later
// release.
func ExampleCountersignature() {
// create a signature holder
sigHolder := cose.NewSignature()
sigHolder.Headers.Protected.SetAlgorithm(cose.AlgorithmES512)
sigHolder.Headers.Unprotected[cose.HeaderLabelKeyID] = []byte("1")
// create message to be signed
msgToSign := cose.NewSignMessage()
msgToSign.Payload = []byte("hello world")
msgToSign.Signatures = append(msgToSign.Signatures, sigHolder)
// create a signer
privateKey, _ := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
signer, _ := cose.NewSigner(cose.AlgorithmES512, privateKey)
// sign message
msgToSign.Sign(rand.Reader, nil, signer)
// create a countersignature holder for the message
msgCountersig := cose.NewCountersignature()
msgCountersig.Headers.Protected.SetAlgorithm(cose.AlgorithmES512)
msgCountersig.Headers.Unprotected[cose.HeaderLabelKeyID] = []byte("11")
// create a countersigner
counterPrivateKey, _ := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
countersigner, _ := cose.NewSigner(cose.AlgorithmES512, counterPrivateKey)
// countersign message
err := msgCountersig.Sign(rand.Reader, countersigner, msgToSign, nil)
if err != nil {
panic(err)
}
// add countersignature as message unprotected header; notice the
// countersignature should be assigned as reference
msgToSign.Headers.Unprotected[cose.HeaderLabelCounterSignatureV2] = msgCountersig
// create a countersignature holder for the signature
sigCountersig := cose.NewCountersignature()
sigCountersig.Headers.Protected.SetAlgorithm(cose.AlgorithmES512)
sigCountersig.Headers.Unprotected[cose.HeaderLabelKeyID] = []byte("11")
// countersign signature
err = sigCountersig.Sign(rand.Reader, countersigner, sigHolder, nil)
if err != nil {
panic(err)
}
// add countersignature as signature unprotected header; notice the
// countersignature should be assigned as reference
sigHolder.Headers.Unprotected[cose.HeaderLabelCounterSignatureV2] = sigCountersig
sig, err := msgToSign.MarshalCBOR()
if err != nil {
panic(err)
}
fmt.Println("message signed and countersigned")
// create a verifier from a trusted public key
publicKey := counterPrivateKey.Public()
verifier, err := cose.NewVerifier(cose.AlgorithmES512, publicKey)
if err != nil {
panic(err)
}
// decode COSE_Sign message containing countersignatures
var msgToVerify cose.SignMessage
err = msgToVerify.UnmarshalCBOR(sig)
if err != nil {
panic(err)
}
// unwrap the message countersignature; the example assumes the header is a
// single countersignature, but real code would consider checking if it
// consists in a slice of countersignatures too.
msgCountersigHdr := msgToVerify.Headers.Unprotected[cose.HeaderLabelCounterSignatureV2]
msgCountersigToVerify := msgCountersigHdr.(*cose.Countersignature)
// verify message countersignature
err = msgCountersigToVerify.Verify(verifier, msgToVerify, nil)
if err != nil {
panic(err)
}
fmt.Println("message countersignature verified")
// unwrap the signature countersignature; the example assumes the header is a
// single countersignature, but real code would consider checking if it
// consists in a slice of countersignatures too.
sig0 := msgToVerify.Signatures[0]
sigCountersigHdr := sig0.Headers.Unprotected[cose.HeaderLabelCounterSignatureV2]
sigCountersigToVerify := sigCountersigHdr.(*cose.Countersignature)
// verify signature countersignature
err = sigCountersigToVerify.Verify(verifier, sig0, nil)
if err != nil {
panic(err)
}
fmt.Println("signature countersignature verified")
// tamper the message and verification should fail
msgToVerify.Payload = []byte("foobar")
err = msgCountersigToVerify.Verify(verifier, msgToVerify, nil)
if err != cose.ErrVerification {
panic(err)
}
fmt.Println("verification error as expected")
// Output:
// message signed and countersigned
// message countersignature verified
// signature countersignature verified
// verification error as expected
}