41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
import { keccak256 } from "../crypto/index.js";
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import { MessagePrefix } from "../constants/index.js";
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import { concat, toUtf8Bytes } from "../utils/index.js";
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/**
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* Computes the [[link-eip-191]] personal-sign message digest to sign.
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*
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* This prefixes the message with [[MessagePrefix]] and the decimal length
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* of %%message%% and computes the [[keccak256]] digest.
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*
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* If %%message%% is a string, it is converted to its UTF-8 bytes
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* first. To compute the digest of a [[DataHexString]], it must be converted
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* to [bytes](getBytes).
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*
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* @example:
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* hashMessage("Hello World")
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* //_result:
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*
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* // Hashes the SIX (6) string characters, i.e.
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* // [ "0", "x", "4", "2", "4", "3" ]
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* hashMessage("0x4243")
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* //_result:
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*
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* // Hashes the TWO (2) bytes [ 0x42, 0x43 ]...
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* hashMessage(getBytes("0x4243"))
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* //_result:
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*
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* // ...which is equal to using data
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* hashMessage(new Uint8Array([ 0x42, 0x43 ]))
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* //_result:
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*
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*/
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export function hashMessage(message: Uint8Array | string): string {
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if (typeof(message) === "string") { message = toUtf8Bytes(message); }
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return keccak256(concat([
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toUtf8Bytes(MessagePrefix),
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toUtf8Bytes(String(message.length)),
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message
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]));
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}
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