Module: Digest::KangarooTwelve

Defined in:
ext/digest/kangarootwelve/ext.c,
lib/digest/kangarootwelve/version.rb,
ext/digest/kangarootwelve/ext.c

Overview

The Digest::KangarooTwelve module is the main component of the KangarooTwelve extension for Ruby.

It contains singleton methods that can be used to create implementation classes. These implementation classes can then be used to create instances for producing hashes.

Example:

Digest::KangarooTwelve[32].new.update("one").update("two").digest

The implementation classes can also be used to directly produce hashes.

Example:

Digest::KangarooTwelve[32].hexdigest("1234")

The produced implementation classes and their instances can be used just like any other classes and instances in the Digest namespace that’s based on Digest::Base.

Defined Under Namespace

Classes: Impl, Metadata

Constant Summary collapse

VERSION = 
"0.4.4"
BLOCK_LENGTH =

8192 bytes

INT2FIX(KT_BLOCK_LENGTH)
DEFAULT_DIGEST_LENGTH =

64 bytes (512 bits)

INT2FIX(KT_DEFAULT_DIGEST_LENGTH)

Class Method Summary collapse

Class Method Details

.Digest::KangarooTwelve ⇒ Object

Creates an implementation class with specified digest length. This method is the simpler form of Digest::KangarooTwelve.implement.

The class is generated in the name form of Digest::KangarooTwelve_<digest_length>, and can be directly referenced after this method is called.



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# File 'ext/digest/kangarootwelve/ext.c', line 446

static VALUE _Digest_KangarooTwelve_singleton_implement_simple(VALUE self, VALUE digest_length)
{
	return implement(ID2SYM(_id_auto), digest_length, Qnil);
}

.Digest::KangarooTwelve.default ⇒ Object

Returns the default implementation class which has a digest length of 64 bytes, and doesn’t have a customization string.



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# File 'ext/digest/kangarootwelve/ext.c', line 332

static VALUE _Digest_KangarooTwelve_singleton_default(VALUE self)
{
	VALUE default_ = Qnil;

	if (rb_ivar_defined(self, _id_default) == Qtrue)
		default_ = rb_ivar_get(self, _id_default);

	if (NIL_P(default_)) {
		default_ = implement(ID2SYM(_id_auto), INT2FIX(KT_DEFAULT_DIGEST_LENGTH), Qnil);
		rb_ivar_set(self, _id_default, default_);
	}

	Check_Type(default_, T_CLASS);
	return default_;
}

.Digest::KangarooTwelve.implement(**opts) ⇒ Object

The Digest::KangarooTwelve::implement method is more configurable than the Digest::KangarooTwelve::[] method, and can implement classes with customization strings, a custom block length, and a different or anonymous name.

The method can be called with the following options:

:n, :name

Specifies the name of the class, which would be placed in the Digest module.

The default value for this option is :auto, and it implies automatic generation of the name. The generated name is in the form of Digest::KangarooTwelve_<digest_length> if a customization string is not specified.

If a customization string is specified, the format would be Digest::KangarooTwelve_<digest_length>_<cust_str_hex>.

Specifying a string would make the method produce Digest::<string>.

Specifying nil would produce an anonymous class. I.e., a class not assigned to any constant, and has no name returned with Class#name, but nil.

:d, :digest_length

Specifies the digest length.

See Digest::KangarooTwelve::DEFAULT_DIGEST_LENGTH for the default value.

:c, :customization

Specifies the customization string. Adding a customization string changes the resulting digest of every input.

:ch, :customization_hex

Specifies the customization string in hex mode.

Calling the method with no argument is the same as calling the Digest::KangarooTwelve::default method.



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# File 'ext/digest/kangarootwelve/ext.c', line 391

static VALUE _Digest_KangarooTwelve_singleton_implement(int argc, VALUE *argv, VALUE self)
{
	VALUE opts, name, digest_length, customization;

	rb_scan_args(argc, argv, "0:", &opts);

	if (NIL_P(opts)) {
		name = ID2SYM(_id_auto);
		digest_length = customization = Qnil;
	} else {
		name = rb_hash_lookup2(opts, ID2SYM(_id_n), Qundef);

		if (name == Qundef)
			name = rb_hash_lookup2(opts, ID2SYM(_id_name), ID2SYM(_id_auto));

		digest_length = rb_hash_lookup2(opts, ID2SYM(_id_d), Qundef);

		if (digest_length == Qundef)
			digest_length = rb_hash_lookup2(opts, ID2SYM(_id_digest_length), Qnil);

		customization = rb_hash_lookup2(opts, ID2SYM(_id_c), Qundef);

		if (customization == Qundef)
			customization = rb_hash_lookup2(opts, ID2SYM(_id_customization), Qundef);

		if (customization == Qundef) {
			VALUE customization_hex = rb_hash_lookup2(opts, ID2SYM(_id_customization_hex), Qundef);

			if (customization_hex == Qundef)
				customization_hex = rb_hash_lookup2(opts, ID2SYM(_id_ch), Qundef);

			if (customization_hex == Qundef) {
				customization = Qnil;
			} else {
				if (TYPE(customization_hex) != T_STRING)
					rb_raise(rb_eTypeError, "Customization argument not a string.");

				customization = hex_decode_str(customization_hex);
			}
		}
	}

	return implement(name, digest_length, customization);
}