# init(rawValue:) Constructs a digest by adopting a caller-supplied 32-byte value. ``` init(rawValue: Data) throws ``` ## Parameters `rawValue` The digest bytes. Must be exactly 32 bytes; any other length throws. ## Discussion Use this when materializing a previously computed digest back into a typed value — for example, after reading the raw bytes from persistent storage or decoding a Nostr NIP-01 event `id` from hex. The bytes are copied in by value (`Data` is a Swift value type), so the initializer has no ongoing aliasing with the caller’s buffer. No cryptographic work is performed here — this initializer is purely a typed wrapper around an existing digest. Compute new digests through [`hash(data:)`](/documentation/OpenSSL/SHA256/hash(data:)) or [`hash(string:)`](/documentation/OpenSSL/SHA256/hash(string:)). > Throws: ``doc://OpenSSL/documentation/OpenSSL/OpenSSLError/invalidInput(_:)`` with a message > describing the length mismatch when `rawValue.count != 32`.