RSAKeyUtils (Nimbus JOSE + JWT v9.21)

java.lang.Object
- com.nimbusds.jose.crypto.impl.RSAKeyUtils

```
public class RSAKeyUtils
extends Object
```
RSA JWK conversion utility.

Constructor Summary

Constructors
Constructor Description

RSAKeyUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static int`	`keyBitLength(PrivateKey privateKey)`	Returns the length in bits of the specified RSA private key.
`static PrivateKey`	`toRSAPrivateKey(RSAKey rsaJWK)`	Returns the private RSA key of the specified RSA JWK.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RSAKeyUtils
```
public RSAKeyUtils()
```
- Method Detail
  - toRSAPrivateKey
```
public static PrivateKey toRSAPrivateKey(RSAKey rsaJWK)
                                  throws JOSEException
```
    Returns the private RSA key of the specified RSA JWK. Supports PKCS#11 keys stores.
    
    Parameters:
    
    rsaJWK - The RSA JWK. Must not be null.
    
    Returns:
    
    The private RSA key.
    
    Throws:
    
    JOSEException - If the RSA JWK doesn't contain a private part.
  - keyBitLength
```
public static int keyBitLength(PrivateKey privateKey)
```
    Returns the length in bits of the specified RSA private key.
    
    Parameters:
    
    privateKey - The RSA private key. Must not be null.
    
    Returns:
    
    The key length in bits, -1 if the length couldn't be determined, e.g. for a PKCS#11 backed key which doesn't expose an RSAPrivateKey interface or support the getModulus() method.