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Module: Digest::Instance

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
Defined in: ext/digest/digest.c,
ext/digest/bubblebabble/bubblebabble.c,
ext/digest/lib/digest.rb

Overview

This module provides instance methods for a digest implementation object to calculate message digest values.

Instance Method Summary

Instance Method Details

#update(string) ⇒ digest_obj #<<(string) ⇒ digest_obj
Also known as: #update

Updates the digest using a given string and returns self.

The update() method and the left-shift operator are overridden by each implementation subclass. (One should be an alias for the other)

[ GitHub ]

  
# File 'ext/digest/digest.c', line 171

static VALUE
rb_digest_instance_update(VALUE self, VALUE str)
{
    rb_digest_instance_method_unimpl(self, "update");

    UNREACHABLE;
}

#==(another_digest_obj) ⇒ Boolean #==(string) ⇒ Boolean

If a string is given, checks whether it is equal to the hex-encoded hash value of the digest object. If another digest instance is given, checks whether they have the same hash value. Otherwise returns false.

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# File 'ext/digest/digest.c', line 367

static VALUE
rb_digest_instance_equal(VALUE self, VALUE other)
{
    VALUE str1, str2;

    if (rb_obj_is_kind_of(other, rb_mDigest_Instance) == Qtrue) {
        str1 = rb_digest_instance_digest(0, 0, self);
        str2 = rb_digest_instance_digest(0, 0, other);
    } else {
        str1 = rb_digest_instance_to_s(self);
        str2 = rb_check_string_type(other);
        if (NIL_P(str2)) return Qfalse;
    }

    /* never blindly assume that subclass methods return strings */
    StringValue(str1);
    StringValue(str2);

    if (RSTRING_LEN(str1) == RSTRING_LEN(str2) &&
	rb_str_cmp(str1, str2) == 0) {
	return Qtrue;
    }
    return Qfalse;
}

#base64digest(str = nil)

If none is given, returns the resulting hash value of the digest in a base64 encoded form, keeping the digest’s state.

If a string is given, returns the hash value for the given string in a base64 encoded form, resetting the digest to the initial state before and after the process.

In either case, the return value is properly padded with ‘=’ and contains no line feeds.

[ GitHub ]

  
# File 'ext/digest/lib/digest.rb', line 68

def base64digest(str = nil)
  [str ? digest(str) : digest].pack('m0')
end

#base64digest!

Returns the resulting hash value and resets the digest to the initial state.

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# File 'ext/digest/lib/digest.rb', line 74

def base64digest!
  [digest!].pack('m0')
end

#block_lengthInteger

Returns the block length of the digest.

This method is overridden by each implementation subclass.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 433

static VALUE
rb_digest_instance_block_length(VALUE self)
{
    rb_digest_instance_method_unimpl(self, "block_length");

    UNREACHABLE;
}

#bubblebabblehash_string

Returns the resulting hash value in a Bubblebabble encoded form.

[ GitHub ]

  
# File 'ext/digest/bubblebabble/bubblebabble.c', line 114

static VALUE
rb_digest_instance_bubblebabble(VALUE self)
{
    return bubblebabble_str_new(rb_funcall(self, id_digest, 0));
}

#digestString #digest(string) ⇒ String

If none is given, returns the resulting hash value of the digest, keeping the digest’s state.

If a string is given, returns the hash value for the given string, resetting the digest to the initial state before and after the process.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 242

static VALUE
rb_digest_instance_digest(int argc, VALUE *argv, VALUE self)
{
    VALUE str, value;

    if (rb_scan_args(argc, argv, "01", &str) > 0) {
        rb_funcall(self, id_reset, 0);
        rb_funcall(self, id_update, 1, str);
        value = rb_funcall(self, id_finish, 0);
        rb_funcall(self, id_reset, 0);
    } else {
        value = rb_funcall(rb_obj_clone(self), id_finish, 0);
    }

    return value;
}

#digest!String

Returns the resulting hash value and resets the digest to the initial state.

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# File 'ext/digest/digest.c', line 266

static VALUE
rb_digest_instance_digest_bang(VALUE self)
{
    VALUE value = rb_funcall(self, id_finish, 0);
    rb_funcall(self, id_reset, 0);

    return value;
}

#digest_lengthInteger

Returns the length of the hash value of the digest.

This method should be overridden by each implementation subclass. If not, digest_obj.digest().length() is returned.

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# File 'ext/digest/digest.c', line 401

static VALUE
rb_digest_instance_digest_length(VALUE self)
{
    /* subclasses really should redefine this method */
    VALUE digest = rb_digest_instance_digest(0, 0, self);

    /* never blindly assume that #digest() returns a string */
    StringValue(digest);
    return INT2NUM(RSTRING_LEN(digest));
}

#file(name)

Updates the digest with the contents of a given file name and returns self.

[ GitHub ]

  
# File 'ext/digest/lib/digest.rb', line 49

def file(name)
  File.open(name, "rb") {|f|
    buf = ""
    while f.read(16384, buf)
      update buf
    end
  }
  self
end

#instance_evaldigest_obj (private)

Finishes the digest and returns the resulting hash value.

This method is overridden by each implementation subclass and often made private, because some of those subclasses may leave internal data uninitialized. Do not call this method from outside. Use #digest!() instead, which ensures that internal data be reset for security reasons.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 191

static VALUE
rb_digest_instance_finish(VALUE self)
{
    rb_digest_instance_method_unimpl(self, "finish");

    UNREACHABLE;
}

#hexdigestString #hexdigest(string) ⇒ String

If none is given, returns the resulting hash value of the digest in a hex-encoded form, keeping the digest’s state.

If a string is given, returns the hash value for the given string in a hex-encoded form, resetting the digest to the initial state before and after the process.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 287

static VALUE
rb_digest_instance_hexdigest(int argc, VALUE *argv, VALUE self)
{
    VALUE str, value;

    if (rb_scan_args(argc, argv, "01", &str) > 0) {
        rb_funcall(self, id_reset, 0);
        rb_funcall(self, id_update, 1, str);
        value = rb_funcall(self, id_finish, 0);
        rb_funcall(self, id_reset, 0);
    } else {
        value = rb_funcall(rb_obj_clone(self), id_finish, 0);
    }

    return hexencode_str_new(value);
}

#hexdigest!String

Returns the resulting hash value in a hex-encoded form and resets the digest to the initial state.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 311

static VALUE
rb_digest_instance_hexdigest_bang(VALUE self)
{
    VALUE value = rb_funcall(self, id_finish, 0);
    rb_funcall(self, id_reset, 0);

    return hexencode_str_new(value);
}

#inspectString

Creates a printable version of the digest object.

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# File 'ext/digest/digest.c', line 338

static VALUE
rb_digest_instance_inspect(VALUE self)
{
    VALUE str;
    size_t digest_len = 32;	/* about this size at least */
    const char *cname;

    cname = rb_obj_classname(self);

    /* #<Digest::ClassName: xxxxx...xxxx> */
    str = rb_str_buf_new(2 + strlen(cname) + 2 + digest_len * 2 + 1);
    rb_str_buf_cat2(str, "#<");
    rb_str_buf_cat2(str, cname);
    rb_str_buf_cat2(str, ": ");
    rb_str_buf_append(str, rb_digest_instance_hexdigest(0, 0, self));
    rb_str_buf_cat2(str, ">");
    return str;
}

#lengthInteger #sizeInteger
Also known as: #size

Returns digest_obj.digest_length().

[ GitHub ]

  
# File 'ext/digest/digest.c', line 419

static VALUE
rb_digest_instance_length(VALUE self)
{
    return rb_funcall(self, id_digest_length, 0);
}

#newanother_digest_obj

Returns a new, initialized copy of the digest object. Equivalent to digest_obj.clone().reset().

[ GitHub ]

  
# File 'ext/digest/digest.c', line 222

static VALUE
rb_digest_instance_new(VALUE self)
{
    VALUE clone = rb_obj_clone(self);
    rb_funcall(clone, id_reset, 0);
    return clone;
}

#resetdigest_obj

Resets the digest to the initial state and returns self.

This method is overridden by each implementation subclass.

[ GitHub ]

  
# File 'ext/digest/digest.c', line 207

static VALUE
rb_digest_instance_reset(VALUE self)
{
    rb_digest_instance_method_unimpl(self, "reset");

    UNREACHABLE;
}

#lengthInteger #sizeInteger

Alias for #length.

#to_sString

Returns digest_obj.hexdigest().

[ GitHub ]

  
# File 'ext/digest/digest.c', line 326

static VALUE
rb_digest_instance_to_s(VALUE self)
{
    return rb_funcall(self, id_hexdigest, 0);
}

#update(string) ⇒ digest_obj #<<(string) ⇒ digest_obj

Alias for #<<.