copy
Creates a new Hash
object that contains a deep copy of the internal state of the current Hash
object.
The optional options
argument controls stream behavior. For XOF hash functions such as 'shake256'
, the outputLength
option can be used to specify the desired output length in bytes.
An error is thrown when an attempt is made to copy the Hash
object after its hash.digest()
method has been called.
// Calculate a rolling hash.
const {
createHash,
} = await import('node:crypto');
const hash = createHash('sha256');
hash.update('one');
console.log(hash.copy().digest('hex'));
hash.update('two');
console.log(hash.copy().digest('hex'));
hash.update('three');
console.log(hash.copy().digest('hex'));
// Etc.
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Since
v13.1.0
Parameters
options
stream.transform
options