Initial design for export of Merkle-Damgard hash state #1577
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This commit provides a building block to implement HMAC with precomputed keys from aws#1574. It adds internal functions to export the state of SHA-256 and use such exported state to initialize a SHA-256 context. Once the design is reviewed and approved, we will similar functions to the other Merkle-Damgard hash functions (MD4, MD5, SHA-1, SHA-2).
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Description of changes:
This PR provides a building block to implement HMAC with precomputed keys from #1574.
It adds internal functions to export the state of SHA-256 and use such exported state to initialize a SHA-256 context.
Once the design is reviewed and approved, we will similar functions to the other Merkle-Damgard hash functions (MD4, MD5, SHA-1, SHA-2).
Call-outs:
N/A
Testing:
Unit tests added.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.