In Files

  • digest/digest.c
  • digest/lib/digest.rb

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Digest::Instance

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

Public Instance Methods

digest_obj << string → digest_obj click to toggle source

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)

 
               static VALUE
rb_digest_instance_update(VALUE self, VALUE str)
{
    rb_raise(rb_eRuntimeError, "%s does not implement update()", RSTRING_PTR(rb_inspect(self)));
}
            
digest_obj == another_digest_obj → boolean click to toggle source
digest_obj == 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.

 
               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 = other;
    }

    /* 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;
}
            
block_length → integer click to toggle source

Returns the block length of the digest.

This method is overridden by each implementation subclass.

 
               static VALUE
rb_digest_instance_block_length(VALUE self)
{
    rb_raise(rb_eRuntimeError, "%s does not implement block_length()", RSTRING_PTR(rb_inspect(self)));
}
            
digest → string click to toggle source
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.

 
               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 clone = rb_obj_clone(self);

        value = rb_funcall(clone, id_finish, 0);
        rb_funcall(clone, id_reset, 0);
    }

    return value;
}
            
digest! → string click to toggle source

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

 
               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_length → integer click to toggle source

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.

 
               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) click to toggle source

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

 
               # File digest/lib/digest.rb, line 36
def file(name)
  File.open(name, "rb") {|f|
    buf = ""
    while f.read(16384, buf)
      update buf
    end
  }
  self
end
            
hexdigest → string click to toggle source
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.

 
               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 clone = rb_obj_clone(self);

        value = rb_funcall(clone, id_finish, 0);
        rb_funcall(clone, id_reset, 0);
    }

    return hexencode_str_new(value);
}
            
hexdigest! → string click to toggle source

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

 
               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);
}
            
inspect → string click to toggle source

Creates a printable version of the digest object.

 
               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;
}
            
length → integer click to toggle source

Returns digest_obj.digest_length().

 
               static VALUE
rb_digest_instance_length(VALUE self)
{
    return rb_funcall(self, id_digest_length, 0);
}
            
new → another_digest_obj click to toggle source

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

 
               static VALUE
rb_digest_instance_new(VALUE self)
{
    VALUE clone = rb_obj_clone(self);
    rb_funcall(clone, id_reset, 0);
    return clone;
}
            
reset → digest_obj click to toggle source

Resets the digest to the initial state and returns self.

This method is overridden by each implementation subclass.

 
               static VALUE
rb_digest_instance_reset(VALUE self)
{
    rb_raise(rb_eRuntimeError, "%s does not implement reset()", RSTRING_PTR(rb_inspect(self)));
}
            
size → integer click to toggle source

Returns digest_obj.digest_length().

 
               static VALUE
rb_digest_instance_length(VALUE self)
{
    return rb_funcall(self, id_digest_length, 0);
}
            
to_s → string click to toggle source

Returns digest_obj.hexdigest().

 
               static VALUE
rb_digest_instance_to_s(VALUE self)
{
    return rb_funcall(self, id_hexdigest, 0);
}
            
update(string) → digest_obj click to toggle source

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)

 
               static VALUE
rb_digest_instance_update(VALUE self, VALUE str)
{
    rb_raise(rb_eRuntimeError, "%s does not implement update()", RSTRING_PTR(rb_inspect(self)));
}
            

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