On Wed, 6 Aug 2025 05:39:56 GMT, Valerie Peng <[email protected]> wrote:
>> This enhancement introduces a new security property
>> "jdk.crypto.disabledAlgorithms" which can be leveraged to disable algorithms
>> for JCE/JCA crypto services. For now, only Cipher, KeyStore, MessageDigest,
>> and Signature services support this new security property. The support can
>> be expanded later to cover more services if needed. Note that this security
>> property is meant to disable algorithms irrespective of providers. If the
>> algorithm is found to be disabled, it will be rejected before reaching out
>> to provider(s) for the corresponding implementation(s).
>>
>> A few implementation notes:
>> 1) The specified security property value is lazily loaded and all changes
>> after it's been loaded are ignored. Invalid entries, e.g. wrong syntax, are
>> ignored and removed. The algorithm name check is case-insensitive. If a
>> disabled algorithm is known to has an object identifier (oid) by JDK, this
>> oid and its aliases is also added to the disabled services.
>> 2) The algorithm name checking impl is based on the
>> sun.security.util.AlgorithmConstraints class, but without the decomposing
>> and different constraints.
>> 3) The hardwiring of NONEwithRSA signature to RSA/ECB/PKCS1Padding cipher in
>> java.security.Signature class is removed. Instead, this is moved to the
>> provider level, i.e. SunJCE and SunPKCS11 provider are changed to claim the
>> NONEwithRSA signature support. Disabling one will not affect the other.
>>
>> CSR will be filed once the review is wrapping up.
>>
>> Thanks~
>> Valerie
>
> Valerie Peng has updated the pull request incrementally with two additional
> commits since the last revision:
>
> - Add a public static final constant for the property name.
> - Address more review comments from Sean and Artur.
src/java.base/share/classes/sun/security/util/CryptoAlgorithmConstraints.java
line 98:
> 96: service.equalsIgnoreCase("KeyStore") ||
> 97: service.equalsIgnoreCase("MessageDigest") ||
> 98: service.equalsIgnoreCase("Signature")) {
It will be a cleaner solution if we define a set of allowed services as a
static class variable (all in upper/lower case) and then do
`SET.contains(service.toUpper/toLower)`. We may also need such set of allowed
services for other operations (like `*` wildcard substitution).
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/26377#discussion_r2257535714
