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  1. JDK
  2. JDK-8259065

Optimize MessageDigest.getInstance

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 17
    • None
    • security-libs
    • None

    Description

      By caching default constructors used in java.security.Provider::newInstanceUtil in a ClassValue, we can reduce the overhead of allocating instances in a variety of places, e.g., MessageDigest::getInstance, without compromising thread-safety or security.

      See: https://cl4es.github.io/2021/01/04/Investigating-MD5-Overheads.html#reflection-overheads for context. Doing this reduces memory allocations made by repeated calls to MessageDigest.getInstance("MD5") by 120 bytes/op, and I expect similar improvements would show up in more places.

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        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. JDK-8229958 Provider.getService() scalability issue for legacy algorithm and message digest

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8269276 Additional tests for MessageDigest with different providers

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8304700 Improve lock contention in javax.crypto.Mac.getInstance

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8304699 Improve lock contention in java.security.MessageDigest.getInstance and java.security.Signature.getInstance

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          links to

          Commit Commit openjdk/jdk/fc1d2a1e

          Review Review openjdk/jdk/1933

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              redestad Claes Redestad
              redestad Claes Redestad
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                Created:
                Updated:
                Resolved: