On Fri, 8 Aug 2025 18:42:08 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 one additional
> commit since the last revision:
>
> Address review comments from Artur and updated tests to leverage
> Utils.runAndCheckException
src/java.base/share/classes/sun/security/util/CryptoAlgorithmConstraints.java
line 32:
> 30: import java.security.CryptoPrimitive;
> 31: import java.security.Key;
> 32: import java.security.Security;
nit.. this has become an unused import
src/java.base/share/classes/sun/security/util/CryptoAlgorithmConstraints.java
line 68:
> 66: public static boolean permits(String service, String algo) {
> 67: String serviceDesc = service + "." + algo;
> 68: return CryptoHolder.CONSTRAINTS.cachedCheckAlgorithm(serviceDesc);
Efficiency nit: It's better for byte-code if you remove `serviceDesc` and just
do the string concatenation in the parameter for `cachedCheckAlgorithm()`.
`serviceDesc` causes an unnecessary store op and extra load op.
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/26377#discussion_r2264142579
PR Review Comment: https://git.openjdk.org/jdk/pull/26377#discussion_r2264151915
