SecurityModule (plugin-api 20.10.0-RC2 API)

```
public interface SecurityModule
```
Provides a generic interface for classes which wrap/hide a cryptographic private key. This interface ensures cryptographic functions required by Ethereum are available to the application at large, without releasing the content of the private key.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`org.apache.tuweni.bytes.Bytes32`	`calculateECDHKeyAgreement(PublicKey partyKey)`	Perform ECDH key agreement calculations.
`PublicKey`	`getPublicKey()`	The public key associated with this security module.
`Signature`	`sign(org.apache.tuweni.bytes.Bytes32 dataHash)`	Produces a signature for the given hash.

- Method Detail
  - sign
```
Signature sign(org.apache.tuweni.bytes.Bytes32 dataHash)
        throws SecurityModuleException
```
    Produces a signature for the given hash.
    
    Parameters:
    
    dataHash - The Keccack hash of a set of data, which is to be signed.
    
    Returns:
    
    the signature (R, S) generated by signing the hash with the node key
    
    Throws:
    
    SecurityModuleException - if sign fails
  - getPublicKey
```
PublicKey getPublicKey()
                throws SecurityModuleException
```
    The public key associated with this security module.
    
    Returns:
    
    the public key associated with the key stored behind this interface.
    
    Throws:
    
    SecurityModuleException - if getPublicKey fails
  - calculateECDHKeyAgreement
```
org.apache.tuweni.bytes.Bytes32 calculateECDHKeyAgreement(PublicKey partyKey)
                                                   throws SecurityModuleException
```
    Perform ECDH key agreement calculations.
    
    Parameters:
    
    partyKey - the key with which an agreement is to be created.
    
    Returns:
    
    The bytes forming the agreement
    
    Throws:
    
    SecurityModuleException - if calculateECDHKeyAgreement fails