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In Dynamics 365 2020 release wave 2, the hash function for the dimension framework in Dynamics 365 Finance has changed. This change may cause breaks in your production and test code in some scenarios. This blog post explains how to inspect your code for impacted patterns and provides guidance about how to validate this functionality after you upgrade, to help you avoid potential issues.
One of the changes in 2020 release wave 2 includes hash functionality updates to tables used by financial dimensions. The hash function, known as SHA1, is being deprecated in all Microsoft products. The reason for this change is that SHA1 has been proven by researchers to be susceptible to collision attacks.
The financial dimensions framework in Microsoft Dynamics 365 Finance has always used SHA1 to generate hash keys. This was not for cryptographic purposes, but instead used for quicker hash key lookups. Because SHA1 has been proven to allow collisions, we need to move away from SHA1 to a more reliable algorithm.
To find a new algorithm, we analyzed many non-cryptographic and cryptographic scenarios. We considered the following factors:
After your code is updated to the new release it will generate Ledger dimensions, Default dimensions, and Dimension enum sets with a new hash key. Data from before the upgrade will be computed with SHA1 and data after the upgrade will be computed with SpookyHash. This means that when the Dimension APIs calculate a hash key for an older dimension combination or set, it will create a duplicate new combination or set. This combination will have a different record ID and a new hash value that is different than the original. The two dimensions will look the same according to the display value. Over time, all new combinations will be created in the new format. In the meantime, you may encounter the following issues in your production and test code.
In conclusion, the hash function for the dimension framework has changed in Dynamics 265 2020 release wave 2, potentially causing breaks in your production and test code in the above scenarios. Carefully inspect your code for the patterns discussed in this blog. Also spend time validating this functionality after you upgrade, to avoid potential issues.
If something is not covered here or if you have questions, leave us a comment. We will keep this post updated when new patterns are discovered.
The post Verify hash function changes after update to Dynamics 365 Finance 2020 release wave 2 appeared first on Microsoft Dynamics 365 Blog.
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