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crypto(3)                                          OpenSSL                                         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
           x5_9(3), x5_9v3(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.

SEE ALSO
       openssl(1), ssl(3)



50                                               2013-03-05                                        crypto(3)