[jdk7u] RFR: 8285591: [11] add signum checks in DSA.java engineVerify

[Sergey Chernyshev]

On Mon, 6 Jun 2022 23:57:51 GMT, Sergey Chernyshev <duke at openjdk.java.net> wrote:

> This is DSA related part of JDK-8277233 security fix. The remaining part of JDK-8277233 is only applicable to 15u and later versions.
> 
> This fix is applicable to 13u and older versions. It ensures that the signature components r, s are positive integers, as required by FIPS PUB 186-4 Section 4.7.

Thank you Andrew for sponsoring.

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PR: https://git.openjdk.java.net/jdk7u/pull/8