func JWSVerify(buf string, alg jwa.SignatureAlgorithm, key interface{}, b64 bool) (ret []byte, err error) {
	verifier, err := verify.New(alg)
	if err != nil {
		return nil, errors.New("failed to create verifier")
	}
	protected, payload, signature := payloadSplit(buf)
	verifyBuf := []byte(protected + "." + payload)
	decodedSignature := make([]byte, base64.RawURLEncoding.DecodedLen(len(signature)))
	if _, err := base64.RawURLEncoding.Decode(decodedSignature, []byte(signature)); err != nil {
		return nil, errors.New(`failed to decode signature`)
	}
	if err := verifier.Verify(verifyBuf, decodedSignature, key); err != nil {
		return nil, errors.New(`failed to verify message`)
	}

	decodedPayload := make([]byte, base64.RawURLEncoding.DecodedLen(len(payload)))
	if b64 {
		if _, err := base64.RawURLEncoding.Decode(decodedPayload, []byte(payload)); err != nil {
			return nil, errors.New(`message verified, failed to decode payload`)
		}
	} else {
		decodedPayload = []byte(payload)
	}
	return decodedPayload, nil
}
// JWSVerify checks if the given JWS message is verifiable using `alg` and `key`.
// If the verification is successful, `err` is nil, and the content of the
// payload that was signed is returned.
JWSVerify checks if the given JWS message is verifiable using `alg` and `key`.
If the verification is successful, `err` is nil, and the content of the
payload that was signed is returned.
// JWSVerify checks if the given JWS message is verifiable using ` alg ` and ` key ` . // If the verification is successful ` err ` is nil and the content of the // payload that was signed is returned .
func JWSVerify(buf string, alg jwa.SignatureAlgorithm, key interface{}, b64 bool) (ret []byte, err error) {
	verifier, err := verify.New(alg)
	if err != nil {
		return nil, errors.New("failed to create verifier")
	}
	protected, payload, signature := payloadSplit(buf)
	verifyBuf := []byte(protected + "." + payload)
	decodedSignature := make([]byte, base64.RawURLEncoding.DecodedLen(len(signature)))
	if _, err := base64.RawURLEncoding.Decode(decodedSignature, []byte(signature)); err != nil {
		return nil, errors.New(`failed to decode signature`)
	}
	if err := verifier.Verify(verifyBuf, decodedSignature, key); err != nil {
		return nil, errors.New(`failed to verify message`)
	}
	decodedPayload := make([]byte, base64.RawURLEncoding.DecodedLen(len(payload)))
	if b64 {
		if _, err := base64.RawURLEncoding.Decode(decodedPayload, []byte(payload)); err != nil {
			return nil, errors.New(`message verified, failed to decode payload`)
		}
	} else {
		decodedPayload = []byte(payload)
	}
	return decodedPayload, nil
}
func JWSVerify ( buf string , alg jwa . SignatureAlgorithm , key interface { } , b64 bool ) ( ret [ ] byte , err error ) { verifier , err := verify . New ( alg ) if err != nil { return nil , errors . New ( " " ) } protected , payload , signature := payloadSplit ( buf ) verifyBuf := [ ] byte ( protected + " " + payload ) decodedSignature := make ( [ ] byte , base64 . RawURLEncoding . DecodedLen ( len ( signature ) ) ) if _ , err := base64 . RawURLEncoding . Decode ( decodedSignature , [ ] byte ( signature ) ) ; err != nil { return nil , errors . New ( `failed to decode signature` ) } if err := verifier . Verify ( verifyBuf , decodedSignature , key ) ; err != nil { return nil , errors . New ( `failed to verify message` ) } decodedPayload := make ( [ ] byte , base64 . RawURLEncoding . DecodedLen ( len ( payload ) ) ) if b64 { if _ , err := base64 . RawURLEncoding . Decode ( decodedPayload , [ ] byte ( payload ) ) ; err != nil { return nil , errors . New ( `message verified, failed to decode payload` ) } } else { decodedPayload = [ ] byte ( payload ) } return decodedPayload , nil }
JWSVerify checks if the given JWS message is verifiable using `alg` and `key`.
JWSVerify checks if the given JWS message is verifiable using ` alg ` and ` key ` .