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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
           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.

SEE ALSO
       openssl(1), ssl(3)



1.0.1e                            2013-02-11                         crypto(3)

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