NAME    [Toc]    [Back]

       crypto - OpenSSL cryptographic library

SYNOPSIS DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

       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 pseudorandom
 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    [Toc]    [Back]

       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    [Toc]    [Back]

       openssl(1), ssl(3)


OpenBSD 3.6                 2003-05-11                          2