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# <!-- rdoc-file=ext/digest/digest.c -->
# This module provides a framework for message digest libraries.
#
# You may want to look at OpenSSL::Digest as it supports more algorithms.
#
# A cryptographic hash function is a procedure that takes data and returns a
# fixed bit string: the hash value, also known as *digest*. Hash functions are
# also called one-way functions, it is easy to compute a digest from a message,
# but it is infeasible to generate a message from a digest.
#
# ## Examples
#
#     require 'digest'
#
#     # Compute a complete digest
#     Digest::SHA256.digest 'message'       #=> "\xABS\n\x13\xE4Y..."
#
#     sha256 = Digest::SHA256.new
#     sha256.digest 'message'               #=> "\xABS\n\x13\xE4Y..."
#
#     # Other encoding formats
#     Digest::SHA256.hexdigest 'message'    #=> "ab530a13e459..."
#     Digest::SHA256.base64digest 'message' #=> "q1MKE+RZFJgr..."
#
#     # Compute digest by chunks
#     md5 = Digest::MD5.new
#     md5.update 'message1'
#     md5 << 'message2'                     # << is an alias for update
#
#     md5.hexdigest                         #=> "94af09c09bb9..."
#
#     # Compute digest for a file
#     sha256 = Digest::SHA256.file 'testfile'
#     sha256.hexdigest
#
# Additionally digests can be encoded in "bubble babble" format as a sequence of
# consonants and vowels which is more recognizable and comparable than a
# hexadecimal digest.
#
#     require 'digest/bubblebabble'
#
#     Digest::SHA256.bubblebabble 'message' #=> "xopoh-fedac-fenyh-..."
#
# See the bubble babble specification at
# http://web.mit.edu/kenta/www/one/bubblebabble/spec/jrtrjwzi/draft-huima-01.txt
# .
#
# ## Digest algorithms
#
# Different digest algorithms (or hash functions) are available:
#
# MD5
# :   See RFC 1321 The MD5 Message-Digest Algorithm
# RIPEMD-160
# :   As Digest::RMD160. See
#     http://homes.esat.kuleuven.be/~bosselae/ripemd160.html.
# SHA1
# :   See FIPS 180 Secure Hash Standard.
# SHA2 family
# :   See FIPS 180 Secure Hash Standard which defines the following algorithms:
#     *   SHA512
#     *   SHA384
#     *   SHA256
#
#
#
# The latest versions of the FIPS publications can be found here:
# http://csrc.nist.gov/publications/PubsFIPS.html.
#
module Digest
  # <!--
  #   rdoc-file=ext/digest/bubblebabble/bubblebabble.c
  #   - Digest.bubblebabble(string) -> bubblebabble_string
  # -->
  # Returns a BubbleBabble encoded version of a given *string*.
  #
  def self.bubblebabble: (String) -> String

  def self.const_missing: (Symbol name) -> singleton(::Digest::Base)

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - Digest.hexencode(string) -> hexencoded_string
  # -->
  # Generates a hex-encoded version of a given *string*.
  #
  def self.hexencode: (String) -> String

  private

  def bubblebabble: (String) -> String

  def hexencode: (String) -> String
end

# <!-- rdoc-file=ext/digest/lib/digest.rb -->
# A mutex for Digest().
#
Digest::REQUIRE_MUTEX: Thread::Mutex

# <!-- rdoc-file=ext/digest/digest.c -->
# This module provides instance methods for a digest implementation object to
# calculate message digest values.
#
module Digest::Instance
  public

  # <!-- rdoc-file=ext/digest/digest.c -->
  # 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)
  #
  def <<: (String) -> self

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj == another_digest_obj -> boolean
  #   - 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.
  #
  def ==: (::Digest::Instance | String) -> bool

  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - 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.
  #
  def base64digest: (?String? str) -> String

  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - base64digest!()
  # -->
  # Returns the resulting hash value and resets the digest to the initial state.
  #
  def base64digest!: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.block_length -> integer
  # -->
  # Returns the block length of the digest.
  #
  # This method is overridden by each implementation subclass.
  #
  def block_length: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/bubblebabble/bubblebabble.c
  #   - digest_obj.bubblebabble -> hash_string
  # -->
  # Returns the resulting hash value in a Bubblebabble encoded form.
  #
  def bubblebabble: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.digest -> string
  #   - digest_obj.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.
  #
  def digest: (?String) -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.digest! -> string
  # -->
  # Returns the resulting hash value and resets the digest to the initial state.
  #
  def digest!: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.digest_length -> integer
  # -->
  # 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.
  #
  def digest_length: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - file(name)
  # -->
  # Updates the digest with the contents of a given file *name* and returns self.
  #
  def file: (String name) -> self

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.hexdigest -> string
  #   - digest_obj.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.
  #
  def hexdigest: (?String) -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.hexdigest! -> string
  # -->
  # Returns the resulting hash value in a hex-encoded form and resets the digest
  # to the initial state.
  #
  def hexdigest!: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.inspect -> string
  # -->
  # Creates a printable version of the digest object.
  #
  def inspect: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.length -> integer
  #   - digest_obj.size -> integer
  # -->
  # Returns digest_obj.digest_length().
  #
  def length: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.new -> another_digest_obj
  # -->
  # Returns a new, initialized copy of the digest object.  Equivalent to
  # digest_obj.clone().reset().
  #
  def new: () -> ::Digest::Base

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.reset -> digest_obj
  # -->
  # Resets the digest to the initial state and returns self.
  #
  # This method is overridden by each implementation subclass.
  #
  def reset: () -> self

  # <!-- rdoc-file=ext/digest/digest.c -->
  # Returns digest_obj.digest_length().
  #
  def size: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.to_s -> string
  # -->
  # Returns digest_obj.hexdigest().
  #
  def to_s: () -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.update(string) -> digest_obj
  #   - digest_obj << string -> digest_obj
  # -->
  # 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)
  #
  def update: (String) -> self

  private

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_obj.instance_eval { finish } -> digest_obj
  # -->
  # 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.
  #
  def finish: () -> self
end

# <!-- rdoc-file=ext/digest/digest.c -->
# This module stands as a base class for digest implementation classes.
#
class Digest::Class
  include ::Digest::Instance

  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - base64digest(str, *args)
  # -->
  # Returns the base64 encoded hash value of a given *string*.  The return value
  # is properly padded with '=' and contains no line feeds.
  #
  def self.base64digest: (String str, *untyped) -> String

  # <!--
  #   rdoc-file=ext/digest/bubblebabble/bubblebabble.c
  #   - Digest::Class.bubblebabble(string, ...) -> hash_string
  # -->
  # Returns the BubbleBabble encoded hash value of a given *string*.
  #
  def self.bubblebabble: (String, *untyped) -> String

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - Digest::Class.digest(string, *parameters) -> hash_string
  # -->
  # Returns the hash value of a given *string*.  This is equivalent to
  # Digest::Class.new(*parameters).digest(string), where extra *parameters*, if
  # any, are passed through to the constructor and the *string* is passed to
  # #digest().
  #
  def self.digest: (String, *untyped) -> String

  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - file(name, *args)
  # -->
  # Creates a digest object and reads a given file, *name*. Optional arguments are
  # passed to the constructor of the digest class.
  #
  #     p Digest::SHA256.file("X11R6.8.2-src.tar.bz2").hexdigest
  #     # => "f02e3c85572dc9ad7cb77c2a638e3be24cc1b5bea9fdbb0b0299c9668475c534"
  #
  def self.file: (String name, *untyped) -> ::Digest::Class

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - Digest::Class.hexdigest(string[, ...]) -> hash_string
  # -->
  # Returns the hex-encoded hash value of a given *string*.  This is almost
  # equivalent to Digest.hexencode(Digest::Class.new(*parameters).digest(string)).
  #
  def self.hexdigest: (String, *untyped) -> String

  private

  def initialize: () -> self
end

# <!-- rdoc-file=ext/digest/digest.c -->
# This abstract class provides a common interface to message digest
# implementation classes written in C.
#
# ## Write a Digest subclass in C
# Digest::Base provides a common interface to message digest classes written in
# C. These classes must provide a struct of type rb_digest_metadata_t:
#     typedef int (*rb_digest_hash_init_func_t)(void *);
#     typedef void (*rb_digest_hash_update_func_t)(void *, unsigned char *, size_t);
#     typedef int (*rb_digest_hash_finish_func_t)(void *, unsigned char *);
#
#     typedef struct {
#       int api_version;
#       size_t digest_len;
#       size_t block_len;
#       size_t ctx_size;
#       rb_digest_hash_init_func_t init_func;
#       rb_digest_hash_update_func_t update_func;
#       rb_digest_hash_finish_func_t finish_func;
#     } rb_digest_metadata_t;
#
# This structure must be set as an instance variable named `metadata` (without
# the +@+ in front of the name). By example:
#      static const rb_digest_metadata_t sha1 = {
#         RUBY_DIGEST_API_VERSION,
#         SHA1_DIGEST_LENGTH,
#         SHA1_BLOCK_LENGTH,
#         sizeof(SHA1_CTX),
#         (rb_digest_hash_init_func_t)SHA1_Init,
#         (rb_digest_hash_update_func_t)SHA1_Update,
#         (rb_digest_hash_finish_func_t)SHA1_Finish,
#     };
#
#     rb_ivar_set(cDigest_SHA1, rb_intern("metadata"),
#                 Data_Wrap_Struct(0, 0, 0, (void *)&sha1));
#
class Digest::Base < Digest::Class
  public

  # <!-- rdoc-file=ext/digest/digest.c -->
  # Update the digest using given *string* and return `self`.
  #
  def <<: (String) -> self

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_base.block_length -> Integer
  # -->
  # Return the block length of the digest in bytes.
  #
  def block_length: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_base.digest_length -> Integer
  # -->
  # Return the length of the hash value in bytes.
  #
  def digest_length: () -> Integer

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_base.reset -> digest_base
  # -->
  # Reset the digest to its initial state and return `self`.
  #
  def reset: () -> self

  # <!--
  #   rdoc-file=ext/digest/digest.c
  #   - digest_base.update(string) -> digest_base
  #   - digest_base << string -> digest_base
  # -->
  # Update the digest using given *string* and return `self`.
  #
  def update: (String) -> self

  private

  def finish: () -> String

  def initialize_copy: (::Digest::Base) -> self
end

# <!-- rdoc-file=ext/digest/sha1/sha1init.c -->
# A class for calculating message digests using the SHA-1 Secure Hash Algorithm
# by NIST (the US' National Institute of Standards and Technology), described in
# FIPS PUB 180-1.
#
# See Digest::Instance for digest API.
#
# SHA-1 calculates a digest of 160 bits (20 bytes).
#
# ## Examples
#     require 'digest'
#
#     # Compute a complete digest
#     Digest::SHA1.hexdigest 'abc'      #=> "a9993e36..."
#
#     # Compute digest by chunks
#     sha1 = Digest::SHA1.new               # =>#<Digest::SHA1>
#     sha1.update "ab"
#     sha1 << "c"                           # alias for #update
#     sha1.hexdigest                        # => "a9993e36..."
#
#     # Use the same object to compute another digest
#     sha1.reset
#     sha1 << "message"
#     sha1.hexdigest                        # => "6f9b9af3..."
#
class Digest::SHA1 < Digest::Base
end

# <!-- rdoc-file=ext/digest/md5/md5init.c -->
# A class for calculating message digests using the MD5 Message-Digest Algorithm
# by RSA Data Security, Inc., described in RFC1321.
#
# MD5 calculates a digest of 128 bits (16 bytes).
#
# ## Examples
#     require 'digest'
#
#     # Compute a complete digest
#     Digest::MD5.hexdigest 'abc'      #=> "90015098..."
#
#     # Compute digest by chunks
#     md5 = Digest::MD5.new               # =>#<Digest::MD5>
#     md5.update "ab"
#     md5 << "c"                           # alias for #update
#     md5.hexdigest                        # => "90015098..."
#
#     # Use the same object to compute another digest
#     md5.reset
#     md5 << "message"
#     md5.hexdigest                        # => "78e73102..."
#
class Digest::MD5 < Digest::Base
end

# <!-- rdoc-file=ext/digest/rmd160/rmd160init.c -->
# A class for calculating message digests using RIPEMD-160 cryptographic hash
# function, designed by Hans Dobbertin, Antoon Bosselaers, and Bart Preneel.
#
# RMD160 calculates a digest of 160 bits (20 bytes).
#
# ## Examples
#     require 'digest'
#
#     # Compute a complete digest
#     Digest::RMD160.hexdigest 'abc'      #=> "8eb208f7..."
#
#     # Compute digest by chunks
#     rmd160 = Digest::RMD160.new               # =>#<Digest::RMD160>
#     rmd160.update "ab"
#     rmd160 << "c"                           # alias for #update
#     rmd160.hexdigest                        # => "8eb208f7..."
#
#     # Use the same object to compute another digest
#     rmd160.reset
#     rmd160 << "message"
#     rmd160.hexdigest                        # => "1dddbe1b..."
#
class Digest::RMD160 < Digest::Base
end

class Digest::SHA256 < Digest::Base
end

class Digest::SHA384 < Digest::Base
end

class Digest::SHA512 < Digest::Base
end

%a{annotate:rdoc:skip}
class Object
  # <!--
  #   rdoc-file=ext/digest/lib/digest.rb
  #   - Digest(name) -> digest_subclass
  # -->
  # Returns a Digest subclass by `name` in a thread-safe manner even when
  # on-demand loading is involved.
  #
  #     require 'digest'
  #
  #     Digest("MD5")
  #     # => Digest::MD5
  #
  #     Digest(:SHA256)
  #     # => Digest::SHA256
  #
  #     Digest(:Foo)
  #     # => LoadError: library not found for class Digest::Foo -- digest/foo
  #
  def Digest: (String | Symbol name) -> singleton(::Digest::Base)
end

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