hashMessage

Calculates an Ethereum-specific hash in EIP-191 format: keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)).

Import

import "github.com/ChefBingbong/viem-go/utils/signature"

Usage

import "github.com/ChefBingbong/viem-go/utils/signature"

// Hash a string message
hash := signature.HashMessage(signature.NewSignableMessage("hello world"))
// "0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68"

// Hash hex data
hash = signature.HashMessage(signature.NewSignableMessageHex("0x68656c6c6f20776f726c64"))
// "0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68"

// Get hash as bytes
hashBytes := signature.HashMessageBytes(signature.NewSignableMessage("hello world"))
// []byte{...}

Returns

• Type: string for HashMessage, []byte for HashMessageBytes

The hashed message. HashMessage returns a hex string with 0x prefix, HashMessageBytes returns raw bytes.

Parameters

message (required)

• Type: signature.SignableMessage

The message to hash. Use signature.NewSignableMessage() for string messages or signature.NewSignableMessageHex() for hex data.

// Hash string message
hash := signature.HashMessage(signature.NewSignableMessage("hello world"))

// Hash hex data
hash = signature.HashMessage(signature.NewSignableMessageHex("0x68656c6c6f20776f726c64"))

Functions

HashMessage

Hashes a message and returns a hex string:

hash := signature.HashMessage(signature.NewSignableMessage("hello world"))
// "0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68"

HashMessageBytes

Hashes a message and returns raw bytes:

hashBytes := signature.HashMessageBytes(signature.NewSignableMessage("hello world"))
// []byte{...}

Message Format

The message hash is computed as:

keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)

This format ensures that messages signed for Ethereum cannot be replayed on other platforms.