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Crypt-Sodium-XS-0.000039
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/ Crypt::Sodium::XS::hash

NAME

Crypt::Sodium::XS::hash - SHA2 cryptographic hashing

SYNOPSIS

use Crypt::Sodium::XS::hash ":default";

my $hash = hash("arbitrary input data");

my $multipart = hash_init();
$multipart->update("arbitrary");
$multipart->update("input", " data");
$hash = $multipart->final;

DESCRIPTION

The SHA-256 and SHA-512 functions are provided for interoperability with other applications. If you are looking for a generic hash function and not specifically SHA-2, using Crypt::Sodium::XS::generichash (BLAKE2b) might be a better choice.

These functions are also not suitable for hashing passwords or deriving keys from passwords. Use Crypt::Sodium::XS::pwhash instead.

These functions are not keyed and are thus deterministic. In addition, the untruncated versions are vulnerable to length extension attacks.

A message can be hashed in a single pass, but a multi-part API is also available to process a message as a sequence of multiple chunks.

FUNCTIONS

Nothing is exported by default. A :default tag imports the functions and constants documented below. A separate :<primitive> import tag is provided for each of the primitives listed in "PRIMITIVES". These tags import the hash_<primitive>_* functions and constants for that primitive. A :all tag imports everything.

hash

hash_<primitive>

my $hash = hash($message);

$message is the message to hash. It may be a Crypt::Sodium::XS::MemVault.

Returns the hash output of "hash_BYTES" bytes.

MULTI-PART INTERFACE

hash_init

hash_<primitive>_init

my $multipart = hash_init($flags);

$flags is optional. It is the flags used for the multipart protected memory object. See Crypt::Sodium::XS::ProtMem.

Returns a multipart hashing object. See "MULTI-PART INTERFACE".

MULTI-PART INTERFACE

A multipart hashing object is created by calling the "hash_init" function. Data to be hashed is added by calling the "update" method of that object as many times as desired. An output hash is generated by calling its "final" method. Do not use the object after calling "final".

The multipart hashing object is an opaque object which provides the following methods:

clone

my $multipart_copy = $multipart->clone;

Returns a cloned copy of the multipart hashing object, duplicating its internal state.

final

my $hash = $multipart->final;

Retruns the final hash for all data added with "update".

Once final has been called, the hashing object must not be used further.

update

$multipart->update(@messages);

Adds all given arguments (stringified) to hashed data. Any argument may be a Crypt::Sodium::XS::MemVault.

CONTSANTS

hash_PRIMITIVE

my $default_primitive = hash_PRIMITIVE();

Returns the name of the default primitive.

hash_BYTES

hash_<primitive>_BYTES

my $hash_size = hash_BYTES();

Returns the size, in bytes, of hash output.

PRIMITIVES

All constants (except _PRIMITIVE) and functions have hash_<primitive>-prefixed couterparts (e.g., hash_sha256, hash_sha512_BYTES).

  • sha256

  • sha512 (default)

SEE ALSO

Crypt::Sodium::XS
Crypt::Sodium::XS::OO::hash
https://doc.libsodium.org/advanced/sha-2_hash_function

FEEDBACK

For reporting bugs, giving feedback, submitting patches, etc. please use the following:

AUTHOR

Brad Barden <perlmodules@5c30.org>

COPYRIGHT & LICENSE

Copyright (c) 2022 Brad Barden. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.