Incorrect documentation

Weijun Wang weijun.wang at oracle.com
Fri Dec 20 08:09:37 UTC 2019


I've already updated the words into

    The format of the Signature bytes for these algorithms is the concatenation of the integers r and s in raw bytes.

It does not have the same detail as your description but I think it's enough to be differentiated from the one with an ASN.1 encoding.

Thanks,
Max

> On Dec 20, 2019, at 3:00 AM, Jiva, Azeem <javajiva at amazon.com> wrote:
> 
> Hi,
>  Following up here with suggested language for the section associated with the *inP1363Formatsignatures.  I don’t have write access to the JBS bug as of yet.
>  
> The ECDSA signature algorithms, as defined by ANSI X9.62, with an output defined in IEEE P1363 format. Both r and s are encoded as unsigned big-endian integers that have been padded to be equal in length to the curve order. The final encoded signature is the r ands concatenated as r || s, resulting in a byte array that is exactly twice as long as the curve order.
> 
> The DSA signature algorithms, as defined by ANSI X9.62, with an output defined in IEEE P1363 format. Both r and s are encoded as unsigned big-endian integers that have been padded to be equal in length to the underlying group order q. The final encoded signature is the r ands concatenated as r || s, resulting in a byte array that is exactly twice as long as the group order.
>  
>  
> From: "Jiva, Azeem" <javajiva at amazon.com>
> Date: Tuesday, December 17, 2019 at 3:43 PM
> To: "security-dev at openjdk.java.net" <security-dev at openjdk.java.net>
> Subject: Incorrect documentation
>  
> Security experts,
>   The official Java Security Standard Algorithm Names incorrectly documents the Signature.*withECDSAinP1363Format algorithms as
> 
> SEQUENCE ::= { r INTEGER, s INTEGER }
> 
> This is incorrect. The IEEE P1363 Format is defined as concatenating the r and s values (with no ASN.1 encoding, but with appropriate padding). The implementations appear correct. This just appears to be a documentation issue.  The documentation for Java 11, 12, and 13 would need to be updated.
> 
> I refer you to the Wikipedia page [2], item #7 that has the relevant information
> 
>  
> 
> Thank you.
> 
>  
>  
> [1]:  https://docs.oracle.com/en/java/javase/12/docs/specs/security/standard-names.html#signature-algorithms
> [2]: https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#Signature_generation_algorithm



More information about the security-dev mailing list