crypto(3)
NAME
crypto - OpenSSL cryptographic library
SYNOPSIS
DESCRIPTION
The OpenSSL crypto library implements a wide range of cryptographic
algorithms used in various Internet standards. The services provided by
this library are used by the OpenSSL implementations of SSL, TLS and
S/MIME, and they have also been used to implement SSH, OpenPGP, and
other cryptographic standards.
OVERVIEW
libcrypto consists of a number of sub-libraries that implement the
individual algorithms.
The functionality includes symmetric encryption, public key
cryptography and key agreement, certificate handling, cryptographic
hash functions and a cryptographic pseudo-random number generator.
- SYMMETRIC CIPHERS
- blowfish(3), cast(3), des(3), idea(3), rc2(3), rc4(3), rc5(3)
- PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT
- dsa(3), dh(3), rsa(3)
- CERTIFICATES
- x509(3), x509v3(3)
- AUTHENTICATION CODES, HASH FUNCTIONS
- hmac(3), md2(3), md4(3), md5(3), mdc2(3), ripemd(3), sha(3)
- AUXILIARY FUNCTIONS
- err(3), threads(3), rand(3), OPENSSL_VERSION_NUMBER(3)
- INPUT/OUTPUT, DATA ENCODING
- asn1(3), bio(3), evp(3), pem(3), pkcs7(3), pkcs12(3)
- INTERNAL FUNCTIONS
- bn(3), buffer(3), lhash(3), objects(3), stack(3), txt_db(3)
NOTES
- Some of the newer functions follow a naming convention using the
numbers 0 and 1. For example the functions: - int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj); - The 0 version uses the supplied structure pointer directly in the
parent and it will be freed up when the parent is freed. In the above example crl would be freed but rev would not. - The 1 function uses a copy of the supplied structure pointer (or in
some cases increases its link count) in the parent and so both (x and obj above) should be freed up.