hashMessage

The hashMessage function from the viem library is a utility function that calculates an Ethereum-specific hash in EIP-191 format. The function takes a message as input and returns the hashed message in hex format.

The function supports three types of input messages:

String messages: The function takes a string message as input and hashes it directly.
Hex messages: The function takes a hex string message as input and hashes it directly.
ByteArray messages: The function takes a ByteArray message as input and hashes it directly.

Here is an example of how to use the hashMessage function:

The function returns the hashed message in hex format. The hash value is a 32-byte value that is computed using the Keccak-256 hash function, with the message prefixed by the bytes "\x19Ethereum Signed Message:\n" followed by the length of the message in bytes, and then the message itself.

message

Output will appear here. You can scroll the text if it becomes too long.

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hashMessage

The function supports three types of input messages:

String messages: The function takes a string message as input and hashes it directly.
Hex messages: The function takes a hex string message as input and hashes it directly.
ByteArray messages: The function takes a ByteArray message as input and hashes it directly.

Here is an example of how to use the hashMessage function:

message

Output will appear here. You can scroll the text if it becomes too long.

JavaScript

import { hashMessage } from 'viem';

hashMessage('hello world') 
// 0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68
    
// Hash a hex data value.
hashMessage({ raw: '0x68656c6c6f20776f726c64' })
// 0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68
    
// Hash a bytes data value.
hashMessage({ 
    raw: Uint8Array.from([
    104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100,
    ])})
// 0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68