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README.md

SHA Example

This code demonstrates how to provably compute the SHA-256 hash of a string using RISC Zero.

Notable details:

  • We use risc0_zkvm::sha rather than general-purpose SHA code in the zkVM. This is because the RISC Zero zkVM includes SHA-specific accelerator code, and we therefore get much better performance by using the native SHA code.
  • We could have passed the guest a String rather than a string literal for the same result.
  • Interpretting the output on the host side as a risc0_zkp::core::sha::Digest is useful for quality of life. We could also directly read the bytes written in the journal, but then we need to be careful about endianness, printing the bytes (Digest implements the Display trait), etc.