# Heimdal crypto library

### 1.3.3

## Introduction

Heimdal libhcrypto library is a implementation many crypto algorithms, among others: AES, SHA, DES, RSA, Camellia and many help function.

hcrypto provies a OpenSSL compatible interface libcrypto interface and is licensed under a 3 clause BSD license (GPL compatible).

The project web page: http://www.h5l.org/

Sections of this manual:

- EVP - generic crypto interface, EVP generic crypto functions
- RAND - random number, RAND crypto functions
- DH - Diffie-Hellman key exchange, Diffie-Hellman functions
- RSA - public-key cryptography, RSA functions
- hcrypto miscellaneous functions

Older interfaces that you should not use:

- DES - Data Encryption Standard crypto interface, DES crypto functions

### Control functions

Functions controlling general behavior, like adding algorithms, are documented in this module: hcrypto function controlling behavior .

### Return values

Return values are diffrent in this module to be compatible with OpenSSL interface. The diffrence is that on success 1 is returned instead of the customary 0.

### History

Eric Young implemented DES in the library libdes, that grew into libcrypto in the ssleay package. ssleay went into recession and then got picked up by the OpenSSL (htp://www.openssl.org/) project.

libhcrypto is an independent implementation with no code decended from ssleay/openssl. Both includes some common imported code, for example the AES implementation.