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block_length 

        # Digest::SHA2.block_length

(from ruby core)
### Implementation from SHA2
---
    digest_obj.block_length -> Integer

---

Return the block length of the digest in bytes.

    Digest::SHA256.new.block_length * 8
    # => 512
    Digest::SHA384.new.block_length * 8
    # => 1024
    Digest::SHA512.new.block_length * 8
    # => 1024

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