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 <[email protected]> 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" <[email protected]>
> Date: Tuesday, December 17, 2019 at 3:43 PM
> To: "[email protected]" <[email protected]>
> 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
