crypto(3)							      OpenSSL								 crypto(3)

NAME

       crypto - OpenSSL cryptographic library

LIBRARY

       libcrypto, -lcrypto

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
	   openssl_blowfish(3), cast(3), openssl_des(3), idea(3), rc2(3), openssl_rc4(3), rc5(3)

       PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT
	   openssl_dsa(3), openssl_dh(3), openssl_rsa(3)

       CERTIFICATES
	   x509(3), x509v3(3)

       AUTHENTICATION CODES, HASH FUNCTIONS
	   openssl_hmac(3), md2(3), md4(3), openssl_md5(3), openssl_mdc2(3), openssl_ripemd(3), openssl_sha(3)

       AUXILIARY FUNCTIONS
	   openssl_err(3), openssl_threads(3), openssl_rand(3), OPENSSL_VERSION_NUMBER(3)

       INPUT/OUTPUT, DATA ENCODING
	   asn1(3), openssl_bio(3), openssl_evp(3), pem(3), pkcs7(3), pkcs12(3)

       INTERNAL FUNCTIONS
	   openssl_bn(3), openssl_buffer(3), openssl_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)

1.0.1i								    2009-07-20								 crypto(3)