问用RSA 256私钥与算法RSASSA-PKCS1-v1.5SHA-256签署JWS

EN

{"alg": "RS256","kid": "asff1233dd"}

{"CompInvoiceId": "0009699521","IssueDtm": "20220623"}<br />

String jwsToken(String key, String data, String header, Container container) throws 
StreamTransformationException{
String tok = null;
byte[] signed = null;
try {
StringBuffer token = new StringBuffer();
//Encode the JWT Header and add it to our string to sign
token.append(Base64.getUrlEncoder().withoutPadding().encodeToString(header.getBytes("UTF- 
8")));
token.append(".");
//Encode the Json payload
token.append(Base64.getUrlEncoder().withoutPadding().encodeToString(data.getBytes("UTF-8")));
//Separate with a period
token.append(".");
//String signedPayload = 
Base64.getUrlEncoder().withoutPadding().encodeToString(signature.sign());
PrivateKey privatekey = null;
String privateKeyPEM = key;
//String key = new String(Files.readAllBytes(file.toPath()), Charset.defaultCharset());
byte[] decodePrivateKey = Base64.getDecoder().decode(key);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodePrivateKey);
privatekey = (PrivateKey) keyFactory.generatePrivate(keySpec);
Signature sig = Signature.getInstance( "SHA256withRSA" );
sig.initSign( ( PrivateKey ) privatekey );
sig.update(token.toString().getBytes("UTF-8"));
signed=sig.sign();
tok = (token.toString());
}
catch (Exception e) {
e.printStackTrace();
}
return tok;
}