WolfSSLEccSignCallback

```
public interface WolfSSLEccSignCallback
```
wolfSSL ECC Signing Callback Interface. This interface specifies how applicaitons should implement the ECC signing callback class to be used by wolfSSL.
After implementing this interface, it should be passed as a parameter to the WolfSSLContext.setEccSignCb() method to be registered with the native wolfSSL library.

Version:

1.0, August 2013

Author:

wolfSSL

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`eccSignCallback(WolfSSLSession ssl, java.nio.ByteBuffer in, long inSz, java.nio.ByteBuffer out, long[] outSz, java.nio.ByteBuffer keyDer, long keySz, java.lang.Object ctx)`	ECC signing callback method.

- Method Detail
  - eccSignCallback
```
int eccSignCallback(WolfSSLSession ssl,
                    java.nio.ByteBuffer in,
                    long inSz,
                    java.nio.ByteBuffer out,
                    long[] outSz,
                    java.nio.ByteBuffer keyDer,
                    long keySz,
                    java.lang.Object ctx)
```
    ECC signing callback method. This method acts as ECC signing callback.
    
    Parameters:
    
    ssl - the current SSL session object from which the callback was initiated.
    
    in - input buffer to sign
    
    inSz - the length of the input buffer, in
    
    out - output buffer where the result of the signature should be stored
    
    outSz - an input/output variable that specifies the size of the output buffer upon invocation and the actual size of the signature should be stored here before returning. Use the first element of the array for both usage (input) and storage (output)
    
    keyDer - ECC Private key in ASN1 format
    
    keySz - length of the key, keyDer, in bytes
    
    ctx - custom user-registered ECC signing context
    
    Returns:
    
    0 upon success, otherwise a negative value on error.