The signing key‘s size is 1024 bits which is not secure enough for the RS256 algorithm.
最编程
2024-01-13 18:29:51
...
/**
* @since 0.10.0
*/
private void assertValid(Key key, boolean signing, int keyLength) throws InvalidKeyException {
// 如果用户有传key的长度，则使用用户的，否则使用默认 【修改的地方】
keyLength = keyLength == 0 ? this.minKeyLength : keyLength;
if (this == NONE) {
String msg = "The 'NONE' signature algorithm does not support cryptographic keys.";
throw new InvalidKeyException(msg);
} else if (isHmac()) {
if (!(key instanceof SecretKey)) {
String msg = this.familyName + " " + keyType(signing) + " keys must be SecretKey instances.";
throw new InvalidKeyException(msg);
}
SecretKey secretKey = (SecretKey) key;
byte[] encoded = secretKey.getEncoded();
if (encoded == null) {
throw new InvalidKeyException("The " + keyType(signing) + " key's encoded bytes cannot be null.");
}
String alg = secretKey.getAlgorithm();
if (alg == null) {
throw new InvalidKeyException("The " + keyType(signing) + " key's algorithm cannot be null.");
}
// These next checks use equalsIgnoreCase per https://github.com/jwtk/jjwt/issues/381#issuecomment-412912272
if (!HS256.jcaName.equalsIgnoreCase(alg) &&
!HS384.jcaName.equalsIgnoreCase(alg) &&
!HS512.jcaName.equalsIgnoreCase(alg)) {
throw new InvalidKeyException("The " + keyType(signing) + " key's algorithm '" + alg +
"' does not equal a valid HmacSHA* algorithm name and cannot be used with " + name() + ".");
}
int size = encoded.length * 8; //size in bits
if (size < keyLength) { // 【修改的地方】
String msg = "The " + keyType(signing) + " key's size is " + size + " bits which " +
"is not secure enough for the " + name() + " algorithm. The JWT " +
"JWA Specification (RFC 7518, Section 3.2) states that keys used with " + name() + " MUST have a " +
"size >= " + minKeyLength + " bits (the key size must be greater than or equal to the hash " +
"output size). Consider using the " + Keys.class.getName() + " class's " +
"'secretKeyFor(SignatureAlgorithm." + name() + ")' method to create a key guaranteed to be " +
"secure enough for " + name() + ". See " +
"https://tools.ietf.org/html/rfc7518#section-3.2 for more information.";
throw new WeakKeyException(msg);
}
} else { //EC or RSA
if (signing) {
if (!(key instanceof PrivateKey)) {
String msg = familyName + " signing keys must be PrivateKey instances.";
throw new InvalidKeyException(msg);
}
}
if (isEllipticCurve()) {
if (!(key instanceof ECKey)) {
String msg = familyName + " " + keyType(signing) + " keys must be ECKey instances.";
throw new InvalidKeyException(msg);
}
ECKey ecKey = (ECKey) key;
int size = ecKey.getParams().getOrder().bitLength();
if (size < keyLength) { // 【修改的地方】
String msg = "The " + keyType(signing) + " key's size (ECParameterSpec order) is " + size +
" bits which is not secure enough for the " + name() + " algorithm. The JWT " +
"JWA Specification (RFC 7518, Section 3.4) states that keys used with " +
name() + " MUST have a size >= " + keyLength +
" bits. Consider using the " + Keys.class.getName() + " class's " +
"'keyPairFor(SignatureAlgorithm." + name() + ")' method to create a key pair guaranteed " +
"to be secure enough for " + name() + ". See " +
"https://tools.ietf.org/html/rfc7518#section-3.4 for more information.";
throw new WeakKeyException(msg);
}
} else { //RSA
if (!(key instanceof RSAKey)) {
String msg = familyName + " " + keyType(signing) + " keys must be RSAKey instances.";
throw new InvalidKeyException(msg);
}
RSAKey rsaKey = (RSAKey) key;
int size = rsaKey.getModulus().bitLength();
if (size < keyLength) { // 【修改的地方】
String section = name().startsWith("P") ? "3.5" : "3.3";
String msg = "The " + keyType(signing) + " key's size is " + size + " bits which is not secure " +
"enough for the " + name() + " algorithm. The JWT JWA Specification (RFC 7518, Section " +
section + ") states that keys used with " + name() + " MUST have a size >= " +
keyLength + " bits. Consider using the " + Keys.class.getName() + " class's " +
"'keyPairFor(SignatureAlgorithm." + name() + ")' method to create a key pair guaranteed " +
"to be secure enough for " + name() + ". See " +
"https://tools.ietf.org/html/rfc7518#section-" + section + " for more information.";
throw new WeakKeyException(msg);
}
}
}
}