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The Libgcrypt Library

This manual is for Libgcrypt (version 1.4.1, 4 January 2008), which is GNU's library of cryptographic building blocks.

Copyright © 2000, 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The text of the license can be found in the section entitled “Copying”.

1. Introduction   What is Libgcrypt.
2. Preparation   What you should do before using the library.
3. Generalities   General library functions and data types.
4. Handler Functions   Working with handler functions.
5. Symmetric cryptography   How to use symmetric cryptography.
6. Hashing   How to use hashing.
7. Public Key cryptography (I)   How to use public key cryptography.
8. Public Key cryptography (II)   How to use public key cryptography, alternatively.
9. Random Numbers   How to work with random numbers.
10. S-expressions   How to manage S-expressions.
11. MPI library   How to work with multi-precision-integers.
12. Prime numbers   How to use the Prime number related functions.
13. Utilities   Utility functions. 
Appendices
A. GNU LESSER GENERAL PUBLIC LICENSE   The GNU Lesser General Public License says how you can copy and share Libgcrypt.
B. GNU GENERAL PUBLIC LICENSE   The GNU General Public License says how you can copy and share some parts of Libgcrypt. 
Indices
Concept Index   Index of concepts and programs.
Function and Data Index   Index of functions, variables and data types. 
 --- The Detailed Node Listing ---

Introduction
1.1 Getting Started   How to use this manual.
1.2 Features   A glance at Libgcrypt's features.
1.3 Overview   Overview about the library. 
Preparation
2.1 Header   What header file you need to include.
2.2 Building sources   How to build sources using the library.
2.3 Building sources using Automake   How to build sources with the help of Automake.
2.4 Initializing the library   How to initialize the library.
2.5 Multi-Threading   How Libgcrypt can be used in a MT environment. 
Generalities
3.1 Controlling the library   Controlling Libgcrypt's behavior.
3.2 Modules   Description of extension modules.
3.3 Error Handling   Error codes and such. 
Handler Functions
4.1 Progress handler   Using a progress handler function.
4.2 Allocation handler   Using special memory allocation functions.
4.3 Error handler   Using error handler functions.
4.4 Logging handler   Using a special logging function. 
Symmetric cryptography
5.1 Available ciphers   List of ciphers supported by the library.
5.2 Cipher modules   How to work with cipher modules.
5.3 Available cipher modes   List of cipher modes supported by the library.
5.4 Working with cipher handles   How to perform operations related to cipher handles.
5.5 General cipher functions   General cipher functions independent of cipher handles. 
Hashing
6.1 Available hash algorithms   List of hash algorithms supported by the library.
6.2 Hash algorithm modules   How to work with hash algorithm modules.
6.3 Working with hash algorithms   List of functions related to hashing. 
Public Key cryptography (I)
7.2 Used S-expressions   Introduction into the used S-expression.
7.1 Available algorithms   Algorithms supported by the library.
7.3 Public key modules   How to work with public key modules.
7.4 Cryptographic Functions   Functions for performing the cryptographic actions.
7.5 General public-key related Functions   General functions, not implementing any cryptography. 
Public Key cryptography (II)
8.1 Available asymmetric algorithms   List of algorithms supported by the library.
8.2 Working with sets of data   How to work with sets of data.
8.4 Working with handles   How to use handles.
8.5 Working with keys   How to work with keys.
8.6 Using cryptographic functions   How to perform cryptographic operations.
8.7 Handle-independent functions   General functions independent of handles. 
Random Numbers
9.1 Quality of random numbers   Libgcrypt uses different quality levels.
9.2 Retrieving random numbers   How to retrieve random numbers. 
S-expressions
10.1 Data types for S-expressions   Data types related with S-expressions.
10.2 Working with S-expressions   How to work with S-expressions. 
MPI library
11.1 Data types   MPI related data types.
11.2 Basic functions   First steps with MPI numbers.
11.3 MPI formats   External representation of MPIs.
11.4 Calculations   Performing MPI calculations.
11.5 Comparisons   How to compare MPI values.
11.6 Bit manipulations   How to access single bits of MPI values.
11.7 Miscellaneous   Miscellaneous MPI functions. 
Prime numbers
12.1 Generation   Generation of new prime numbers.
12.2 Checking   Checking if a given number is prime. 
Utilities
13.1 Memory allocation   Functions related with memory allocation.
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