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signature.go
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signature.go
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package jws
import (
"crypto/rsa"
"encoding/json"
"github.com/alexandru-ionut-balan/ing-jws/crypto"
"github.com/alexandru-ionut-balan/ing-jws/logging"
"github.com/alexandru-ionut-balan/ing-jws/util"
)
func generateEncodedHeader(jwsHeader *JwsHeader) (string, error) {
rawHeaderBytes, err := json.Marshal(jwsHeader)
if err != nil {
logging.Error("Cannot marshal JWS Header into JSON.", nil)
return "", err
}
return crypto.Base64(rawHeaderBytes), nil
}
func generateSignatureValue(encodedJwsHeader string, httpHeaders []util.HttpHeader, privateKey *rsa.PrivateKey) (string, error) {
signatureInput := encodedJwsHeader + "."
for _, header := range httpHeaders {
signatureInput += header.Name + ": " + header.Value + "\n"
}
signedInput, err := crypto.Sign(signatureInput[:len(signatureInput)-1], privateKey)
if err != nil {
logging.Error("Cannot generate signature value.", nil)
return "", err
}
return crypto.Base64(signedInput), nil
}
func GenerateSignature(jwsHeader *JwsHeader, httpHeaders []util.HttpHeader, privateKey *rsa.PrivateKey) (string, error) {
encodedHeader, err := generateEncodedHeader(jwsHeader)
if err != nil {
logging.Error("Cannot create signature!", nil)
return "", err
}
signatureValue, err := generateSignatureValue(encodedHeader, httpHeaders, privateKey)
if err != nil {
logging.Error("Cannot create signature!", nil)
return "", err
}
return encodedHeader + ".." + signatureValue, nil
}