ethers.js/docs.wrm/api/utils/hashing.wrm

_title: Hashing

_section: Hashing Algorithms

Explain what hash functions are?


_subsection: Cryptographic Hashing

The [Cryptographic Hash Functions](https://en.wikipedia.org/wiki/Cryptographic_hash_function)
are a specific family of hash functions.

_property: utils.keccak256(aBytesLike) => string<[[datahexstring]]<32>>  @<utils-keccak256> @SRC<keccak256>
Returns the [KECCAK256](https://en.wikipedia.org/wiki/SHA-3) digest //aBytesLike//.

_property: utils.ripemd160(aBytesLike) => string<[[datahexstring]]<20>>  @<utils-ripemd160> @SRC<sha2>
Returns the [RIPEMD-160](https://en.m.wikipedia.org/wiki/RIPEMD) digest of //aBytesLike//.

_property: utils.sha256(aBytesLike) => string<[[datahexstring]]<32>>  @<utils-sha256> @SRC<sha2:function.sha256>
Returns the [SHA2-256](https://en.wikipedia.org/wiki/SHA-2) digest of //aBytesLike//.

_property: utils.sha512(aBytesLike) => string<[[datahexstring]]<64>>  @<utils-sha512> @SRC<sha2:function.sha512>
Returns the [SHA2-512](https://en.wikipedia.org/wiki/SHA-2) digest of //aBytesLike//.

_property: utils.computeHmac(algorithm, key, data) => string<[[datahexstring]]>  @<utils-computehmac> @SRC<sha2>
Returns the [HMAC](https://en.wikipedia.org/wiki/HMAC) of //data// with //key//
using the [Algorithm](supported-algorithm) //algorithm//.


_heading: HMAC Supported Algorithms @<supported-algorithm> @SRC<sha2:enum.SupportedAlgorithms>

_property: utils.SupportedAlgorithms.sha256 => string
Use the [SHA2-256](https://en.wikipedia.org/wiki/SHA-2) hash algorithm.

_property: utils.SupportedAlgorithms.sha512 => string
Use the [SHA2-512](https://en.wikipedia.org/wiki/SHA-2) hash algorithm.


_subsection: Common Hashing Helpers

_property: utils.hashMessage(message) => string<[[datahexstring]]<32>>  @<utils-hashmessage> @SRC<hash>
Computes the Ethereum message digest of //message//. Ethereum messages are
converted to UTF-8 bytes and prefixed with ``\x19Ethereum Signed Message:``
and the length of //message//.

_property: utils.id(text) => string<[[datahexstring]]<32>>  @<utils-id> @SRC<hash>
The Ethereum Identity function computs the keccak256 hash of the //text// bytes.

_property: utils.namehash(name) => string<[[datahexstring]]<32>>  @<utils-namehash> @SRC<hash>
Returns the [ENS Namehash](https://docs.ens.domains/contract-api-reference/name-processing#hashing-names) of //name//.


_subsection: Solidity Hashing Algorithms

When using the Solidity ``abi.packEncoded(...)`` function, a non-standard
//tightly packed// version of encoding is used. These functions implement
the tightly packing algorithm.

_property: utils.solidityPack(arrayOfTypes, arrayOfValues) => string<[[datahexstring]]>  @<utils-soliditypack> @SRC<solidity:pack>
Returns the non-standard encoded //arrayOfValues// packed according to
their respecive type in //arrayOfTypes//.

_property: utils.solidityKeccak256(arrayOfTypes, arrayOfValues) => string<[[datahexstring]]<32>>  @<utils-soliditykeccak256> @SRC<solidity:keccak256>
Returns the KECCAK256 of the non-standard encoded //arrayOfValues// packed
according to their respective type in //arrayOfTypes//.

_property: utils.soliditySha256(arrayOfTypes, arrayOfValues) => string<[[datahexstring]]<32>>  @<utils-soliditysha256> @SRC<solidity:sha256>
Returns the SHA2-256 of the non-standard encoded //arrayOfValues// packed
according to their respective type in //arrayOfTypes//.