Section 3 of the manual describes all library functions excluding the library functions (system call wrappers) described in Section 2, which implement system calls.

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Crypt::PK::DH
Public key cryptography based on Diffie-Hellman
Crypt::PK::DSA
Public key cryptography based on DSA
Crypt::PK::ECC
Public key cryptography based on EC
Crypt::PK::Ed25519
Digital signature based on Ed25519
Crypt::PK::RSA
Public key cryptography based on RSA
Crypt::PK::X25519
Asymmetric cryptography based on X25519
Crypt::PRNG
Cryptographically secure random number generator
Crypt::PRNG::ChaCha20
Cryptographically secure PRNG based on ChaCha20 (stream cipher) algorithm
Crypt::PRNG::Fortuna
Cryptographically secure PRNG based on Fortuna algorithm
Crypt::PRNG::RC4
Cryptographically secure PRNG based on RC4 (stream cipher) algorithm
Crypt::PRNG::Sober128
Cryptographically secure PRNG based on Sober128 (stream cipher) algorithm
Crypt::PRNG::Yarrow
Cryptographically secure PRNG based on Yarrow algorithm
Crypt::PasswdMD5
Provide interoperable MD5-based crypt() functions
Crypt::RC4
Perl implementation of the RC4 encryption algorithm
Crypt::RSA::Parse
Parse RSA keys
Crypt::Random::Seed
Simple method to get strong randomness
Crypt::Random::Source
Get weak or strong random data from pluggable sources
Crypt::Random::Source::Base
Abstract base class for Crypt::Random::Source classes
Crypt::Random::Source::Base::File
File (or device) random data sources
Crypt::Random::Source::Base::Handle
IO::Handle based random data sources
Crypt::Random::Source::Base::Proc
Base class for helper processes (e.g. "openssl")
Crypt::Random::Source::Base::RandomDevice
Base class for random devices
Crypt::Random::Source::Factory
Load and instantiate sources of random data
Crypt::Random::Source::Strong
Abstract base class for strong random data sources
Crypt::Random::Source::Strong::devrandom
A strong random data source using /dev/random
Crypt::Random::Source::Weak
Abstract base class for weak random data sources
Crypt::Random::Source::Weak::devurandom
A weak random data source using /dev/urandom
Crypt::Rijndael
Crypt::CBC compliant Rijndael encryption module
Crypt::SSLeay
OpenSSL support for LWP
Crypt::SSLeay::Version
Obtain OpenSSL version information
Crypt::SaltedHash
Perl interface to functions that assist in working with salted hashes
Crypt::Simple
encrypt stuff simply
Crypt::SmbHash
Perl-only implementation of lanman and nt md4 hash functions, for use in Samba style smbpasswd entries
Crypt::Stream::ChaCha
Stream cipher ChaCha
Crypt::Stream::RC4
Stream cipher RC4
Crypt::Stream::Rabbit
Stream cipher Rabbit
Crypt::Stream::Salsa20
Stream cipher Salsa20
Crypt::Stream::Sober128
Stream cipher Sober128
Crypt::Stream::Sosemanuk
Stream cipher Sosemanuk
Crypt::Twofish
The Twofish Encryption Algorithm
Crypt::U2F::Server
Low level wrapper around the U2F two factor authentication C library (server side)
Crypt::U2F::Server::Simple
Register and Authenticate U2F compatible security devices
Crypt::URandom
Provide non blocking randomness
Crypt::UnixCrypt
perl-only implementation of the "crypt" function
Crypt::UnixCrypt_XS
perl xs interface for a portable traditional crypt function
Crypt::Util
A lightweight Crypt/Digest convenience API
Crypt::X509
Parse a X.509 certificate
CryptX
Cryptographic toolkit
CryptoContext
The implementation for a SRTP cryptographic context.  
CryptoContext.h
CryptoContext.h
CryptoContextCtrl
The implementation for a SRTCP cryptographic context.  
CryptoContextCtrl.h
CryptoContextCtrl.h
CurrentMatrix
vpCurrentMatrix - choose the current transformation matrix
Curses
terminal screen handling and optimization
Curses::UI
A curses based OO user interface framework
Curses::UI::Buttonbox
Create and manipulate button widgets
Curses::UI::Calendar
Create and manipulate calendar widgets
Curses::UI::Checkbox
Create and manipulate checkbox widgets
Curses::UI::Color
Color support module
Curses::UI::Common
Common methods for Curses::UI
Curses::UI::Container
Create and manipulate container widgets
Curses::UI::Dialog::Basic
Create and manipulate basic dialogs
Curses::UI::Dialog::Calendar
Create and manipulate calendar dialogs
Curses::UI::Dialog::Dirbrowser
Create and manipulate filebrowser dialogs
Curses::UI::Dialog::Error
Create and manipulate error dialogs
Curses::UI::Dialog::Filebrowser
Create and manipulate filebrowser dialogs
Curses::UI::Dialog::Progress
Create and manipulate progress dialogs
Curses::UI::Dialog::Question
Pose a simple question to the user
Curses::UI::Dialog::Status
Create and manipulate status dialogs
Curses::UI::Label
Create and manipulate label widgets
Curses::UI::Listbox
Create and manipulate listbox widgets
Curses::UI::Menubar
Create and manipulate menubar widgets
Curses::UI::Notebook
Create and manipulate notebook widgets
Curses::UI::PasswordEntry
Create and manipulate passwordentry widgets
Curses::UI::Popupmenu
Create and manipulate popupbox widgets
Curses::UI::Progressbar
Create and manipulate progressbar widgets
Curses::UI::Radiobuttonbox
Create and manipulate radiobuttonbox widgets
Curses::UI::Searchable
Add 'less'-like search abilities to a widget
Curses::UI::TextEditor
Create and manipulate texteditor widgets
Curses::UI::TextEntry
Create and manipulate textentry widgets
Curses::UI::TextViewer
Create and manipulate textviewer widgets
Curses::UI::Tutorial
Tutorial for the Curses::UI framework
Curses::UI::Widget
The base class for all widgets
Curses::UI::Window
Create and manipulate Window widgets
Curses::Widgets
Base widget class for use with the Curses::Application framework
Curses::Widgets::ButtonSet
Button Set Widgets
Curses::Widgets::Calendar
Calendar Widgets
Curses::Widgets::ComboBox
Combo-Box Widgets
Curses::Widgets::Label
Label Widgets
Curses::Widgets::ListBox
List Box Widgets
Curses::Widgets::ListBox::MultiColumn
Multi-Column List Box Widgets
Curses::Widgets::Menu
Menu Widgets
Curses::Widgets::ProgressBar
Progress Bar Widgets
Curses::Widgets::TextField
Text Field Widgets
Curses::Widgets::TextMemo
Text Memo Widgets
Curses::Widgets::Tutorial
Curses::Widget::Tutorial -- Widget Usage Tutorial
Curses::Widgets::Tutorial::Creation
Curses::Widget::Tutorial::Creation -- Widget Creation Tutorial
Cvs
Object oriented interface to the CVS command
Cwd
get pathname of current working directory
Cwd::Guard
Temporary changing working directory (chdir)