IHashDrbg

All Known Implementing Classes:

HASHDRBG, SHA2DRBG, SHA5DRBG
```
public interface IHashDrbg
```
Expose programming interfaces to accomplish full API flexibility discussed in NIST 800-90 for hash-based deterministic random bit generators.

Method Summary

Methods
Modifier and Type	Method and Description
`byte[]`	`generate(int requested_no_of_bytes, boolean prediction_resistant, byte[] additionalInput)` Generate the requested number of bytes from the DRBG From section 10.1.1.4 of NIST SP 800-90
`int`	`init(java.lang.String algorithm, int bitStrengthRequested, java.nio.ByteBuffer entropySource, boolean predictionResistant)` Not really discussed in NIST document, but seems to be necessary to implement.
`void`	`instantiate(byte[] nonce, byte[] personalization)` Initialize the DRBG
`void`	`reseed(byte[] addlInput)` Add additional entropy to the DRBG.

- Method Detail
  - instantiate
```
void instantiate(byte[] nonce,
               byte[] personalization)
```
    Initialize the DRBG
    
    Parameters:
    nonce - caller-supplied nonce (optional, may be NULL)
    personalization - caller-supplied personalization data (optional, may be NULL) From NIST SP 800-90, Section 10.1.1.2
  - reseed
```
void reseed(byte[] addlInput)
```
    Add additional entropy to the DRBG. From NIST SP 800-90, Section 10.1.1.3
    
    Parameters:
    additionalInput - caller-supplied additional input (optional, may be NULL)
  - generate
```
byte[] generate(int requested_no_of_bytes,
              boolean prediction_resistant,
              byte[] additionalInput)
                throws java.lang.IllegalStateException
```
    Generate the requested number of bytes from the DRBG From section 10.1.1.4 of NIST SP 800-90
    
    Parameters:
    requested_no_of_bytes - how many bytes to produce
    prediction_resistant - whether additional entropy has been supplied through the entropySource for the generate operation
    additionalInput - caller-supplied additional input (optional, may be NULL)
    
    Returns:
    the requested number of bytes of data
    
    Throws:
    
    java.lang.IllegalStateException
  - init
```
int init(java.lang.String algorithm,
       int bitStrengthRequested,
       java.nio.ByteBuffer entropySource,
       boolean predictionResistant)
         throws java.lang.IllegalArgumentException
```
    Not really discussed in NIST document, but seems to be necessary to implement.
    
    Parameters:
    algorithm - the name of the hash algorithm to employ
    bitStrengthRequested - the strength of the expected output (depends on strength of the algorithm above, typical values 112, 128, 192, 256)
    entropySource - a ByteBuffer the caller will use to supply entropy, or NULL if caller chooses not to
    predictionResistant - whether additional entropy will be supplied through the entropySource before generate operations
    
    Returns:
    the number of bits of security strength the DRBG will provide (and the entropy the caller must supply through entropySource (if supplied by caller))
    
    Throws:
    
    java.lang.IllegalArgumentException

instantiate

reseed

generate

init