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 cryptogra-
       phy and key agreement, certificate handling, cryptographic hash func-
       tions 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), ec(3), lhash(3), objects(3), stack(3), txt_db(3)

NOTES

       Some of the newer functions follow a naming convention using the num-
       bers 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 par-
       ent 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)

1.0.2t                            2019-09-10                         crypto(3)