Hash

Table of Contents

  1. Functions

    1. sha3

    2. sha3Raw

    3. keccak256Wrapper

    4. getType

    5. elementaryName

    6. solidityPack

    7. processSolidityEncodePackedArgs

    8. encodePacked

    9. soliditySha3

    10. soliditySha3Raw

    11. getStorageSlotNumForLongString

Functions

sha3

This function computes the Keccak-256 hash of the input and returns a hexstring. Input: Bytes Output: string | undefined

Example:

    console.log(web3.utils.sha3('web3.js'));
    > 0x63667efb1961039c9bb0d6ea7a5abdd223a3aca7daa5044ad894226e1f83919a

    console.log(web3.utils.sha3(''));
    > undefined

sha3Raw

This function will calculate the sha3 of the input but does return the hash value instead of null if for example an empty string is passed. Input: Bytes Output: string

Example:

    console.log(web3.utils.sha3Raw('web3.js'));
    > 0x63667efb1961039c9bb0d6ea7a5abdd223a3aca7daa5044ad894226e1f83919a
    console.log(web3.utils.sha3Raw(''));
    > 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470

keccak256Wrapper

This function is a wrapper for ethereum-cryptography/keccak256 to allow hashing a string and a bigint in addition to UInt8Array. Inputs: Bytes | Numbers | string | ReadonlyArray Output: string

Example:

    console.log(web3.utils.keccak256Wrapper('web3.js'));
    > 0x63667efb1961039c9bb0d6ea7a5abdd223a3aca7daa5044ad894226e1f83919a
    console.log(web3.utils.keccak256Wrapper(1));
    > 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6
    console.log(web3.utils.keccak256Wrapper(0xaf12fd));
    > 0x358640fd4719fa923525d74ab5ae80a594301aba5543e3492b052bf4598b794c

getType

Return type and value Input: Sha3Input Output: [string, EncodingTypes]

elementaryName

Returns the type with size if uint or int Input: string Output: string

solidityPack

Pads the value based on size and type returns a string of the padded value Input: string, EncodingTypes Output: string

processSolidityEncodePackedArgs

Returns a string of the tightly packed value given based on the type Input: Sha3Input Output: string

encodePacked

Encodes packed arguments to a hexstring Input: Sha3Input[] Output: string

soliditySha3

This function will tightly pack values given in the same way solidity would then hash. Returns a hash string, or null if input is empty. Input: Sha3Input Output: string | undefined`

Example:

    console.log([{ type: 'string', value: '31323334' }]);
    console.log(web3.utils.soliditySha3({ type: "string", value: "31323334" }));
    > 0xf15f8da2ad27e486d632dc37d24912f634398918d6f9913a0a0ff84e388be62b

soliditySha3Raw

This function will tightly pack values given in the same way solidity would then hash. Returns a hash string, if input is empty will return 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470. Input: Sha3Input Output: string

Example:

    console.log(web3.utils.soliditySha3Raw({ type: "string", value: "helloworld" }))
    > 0xfa26db7ca85ead399216e7c6316bc50ed24393c3122b582735e7f3b0f91b93f0

getStorageSlotNumForLongString

Get the slot number for storing a long string in the contract. This function is particularly useful for getStorage method. Returns the slot number where the long string will be stored. Input: number | string Output: string

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