On Tue, 24 Aug 2021 17:47:18 GMT, Valerie Peng <valer...@openjdk.org> wrote:

>> Weijun Wang has updated the pull request incrementally with one additional 
>> commit since the last revision:
>> 
>>   best practice for reading DEFAULT, switch expression, etc
>
> src/java.base/share/classes/sun/security/util/DerInputStream.java line 352:
> 
>> 350:      * @throws IOException if an I/O error happens while peeking the 
>> byte
>> 351:      */
>> 352:     public boolean seeOptionalContextSpecific(int n) throws IOException 
>> {
> 
> Given the two getOptionalXXXContextSpecific(int) method, do we really need 
> this to be public? Same goes for the two checkNextTag(...) methods above.

It is useful for other OPTIONAL fields that does not have a context tag. For 
example, `keyLength` inside


PBKDF2-params ::= SEQUENCE {
     salt CHOICE {
       specified OCTET STRING,
       otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
     },
     iterationCount INTEGER (1..MAX),
     keyLength INTEGER (1..MAX) OPTIONAL,
     prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1
}
 ```
Maybe I should create a `getOptional(byte)` method?

-------------

PR: https://git.openjdk.java.net/jdk/pull/5221

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