DerUtils (security 201 API)

java.lang.Object
- io.airlift.security.der.DerUtils

```
public final class DerUtils
extends Object
```
ASN.1 DER encoder methods necessary to process PEM files and to write a certificate signing request. NOTE: this API is only present for the two mentioned use cases, and is subject to change without warning.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static List<byte[]>`	`decodeSequence(byte[] sequence)`	Decodes a sequence of encoded values.
`static byte[]`	`decodeSequenceOptionalElement(byte[] element)`	Decodes a optional element of a sequence.
`static byte[]`	`encodeBitString(int padBits, byte[] value)`	Encodes a bit string padded with the specified number of bits.
`static byte[]`	`encodeLength(int length)`	Encodes the length of a DER value.
`static byte[]`	`encodeOctetString(byte[] value)`	Encodes an octet string.
`static byte[]`	`encodeOid(String oid)`
`static byte[]`	`encodeSequence(byte[]... encodedValues)`	Encodes a sequence of encoded values.

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

- Method Detail
  - encodeSequence
```
public static byte[] encodeSequence(byte[]... encodedValues)
```
    Encodes a sequence of encoded values.
  - decodeSequence
```
public static List<byte[]> decodeSequence(byte[] sequence)
```
    Decodes a sequence of encoded values.
  - decodeSequenceOptionalElement
```
public static byte[] decodeSequenceOptionalElement(byte[] element)
```
    Decodes a optional element of a sequence.
  - encodeBitString
```
public static byte[] encodeBitString(int padBits,
                                     byte[] value)
```
    Encodes a bit string padded with the specified number of bits. The encoding is a byte containing the padBits followed by the value bytes.
  - encodeOctetString
```
public static byte[] encodeOctetString(byte[] value)
```
    Encodes an octet string.
  - encodeLength
```
public static byte[] encodeLength(int length)
```
    Encodes the length of a DER value. The encoding of a 7bit value is simply the value. Values needing more than 7bits are encoded as a lead byte with the high bit set and containing the number of value bytes. Then the following bytes encode the length using the least number of bytes possible.
  - encodeOid
```
public static byte[] encodeOid(String oid)
```