Inherits: Reference < Object

Context to compute cryptographic hashes over multiple iterations.


The HashingContext class provides an interface for computing cryptographic hashes over multiple iterations. This is useful for example when computing hashes of big files (so you don't have to load them all in memory), network streams, and data streams in general (so you don't have to hold buffers).

The HashType enum shows the supported hashing algorithms.

const CHUNK_SIZE = 1024

func hash_file(path):
    var ctx = HashingContext.new()
    var file = File.new()
    # Start a SHA-256 context.
    # Check that file exists.
    if not file.file_exists(path):
    # Open the file to hash.
    file.open(path, File.READ)
    # Update the context after reading each chunk.
    while not file.eof_reached():
    # Get the computed hash.
    var res = ctx.finish()
    # Print the result as hex string and array.
    printt(res.hex_encode(), Array(res))



finish ( )


start ( HashType type )


update ( PoolByteArray chunk )


enum HashType:

HashType HASH_MD5 = 0

Hashing algorithm: MD5.

HashType HASH_SHA1 = 1

Hashing algorithm: SHA-1.

HashType HASH_SHA256 = 2

Hashing algorithm: SHA-256.

Method Descriptions

PoolByteArray finish ( )

Closes the current context, and return the computed hash.

Error start ( HashType type )

Starts a new hash computation of the given type (e.g. HASH_SHA256 to start computation of a SHA-256).

Error update ( PoolByteArray chunk )

Updates the computation with the given chunk of data.