RFR: 8196415: Disable SHA-1 Signed JARs

[Sean Coffey]

On Mon, 26 Apr 2021 17:29:26 GMT, Sean Mullan <mullan at openjdk.org> wrote:

> This change will restrict JARs signed with SHA-1 algorithms and treat them as if they were unsigned. This applies to the algorithms used to digest, sign, and optionally timestamp the JAR. It also applies to the signature and digest algorithms of the certificates in the certificate chain of the code signer and the Timestamp Authority, and any CRLs or OCSP responses that are used to verify if those certificates have been revoked.
> 
> In order to reduce the compatibility risk for applications that have been previously timestamped or use private CAs, there are two exceptions to this policy:
> 
> - Any JAR signed with SHA-1 algorithms and timestamped prior to January 01, 2019 will not be restricted.
> - Any JAR signed with a SHA-1 certificate that does not chain back to a Root CA included by default in the JDK `cacerts` keystore will not be restricted.
> 
> These exceptions may be removed in a future JDK release.
> 
> All tests are in the closed repo for now.
> 
> CSR: https://bugs.openjdk.java.net/browse/JDK-8264362

Marked as reviewed by coffeys (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3700