159191Skris=pod
259191Skris
359191Skris=head1 NAME
459191Skris
559191Skriscrypto - OpenSSL cryptographic library
659191Skris
759191Skris=head1 SYNOPSIS
859191Skris
959191Skris=head1 DESCRIPTION
1059191Skris
1159191SkrisThe OpenSSL B<crypto> library implements a wide range of cryptographic
1259191Skrisalgorithms used in various Internet standards. The services provided
1359191Skrisby this library are used by the OpenSSL implementations of SSL, TLS
1459191Skrisand S/MIME, and they have also been used to implement SSH, OpenPGP, and
1559191Skrisother cryptographic standards.
1659191Skris
1759191Skris=head1 OVERVIEW
1859191Skris
1959191SkrisB<libcrypto> consists of a number of sub-libraries that implement the
2059191Skrisindividual algorithms.
2159191Skris
2259191SkrisThe functionality includes symmetric encryption, public key
2359191Skriscryptography and key agreement, certificate handling, cryptographic
2459191Skrishash functions and a cryptographic pseudo-random number generator.
2559191Skris
2659191Skris=over 4
2759191Skris
2859191Skris=item SYMMETRIC CIPHERS
2959191Skris
3059191SkrisL<blowfish(3)|blowfish(3)>, L<cast(3)|cast(3)>, L<des(3)|des(3)>,
3159191SkrisL<idea(3)|idea(3)>, L<rc2(3)|rc2(3)>, L<rc4(3)|rc4(3)>, L<rc5(3)|rc5(3)> 
3259191Skris
3359191Skris=item PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT
3459191Skris
3559191SkrisL<dsa(3)|dsa(3)>, L<dh(3)|dh(3)>, L<rsa(3)|rsa(3)>
3659191Skris
3759191Skris=item CERTIFICATES
3859191Skris
3959191SkrisL<x509(3)|x509(3)>, L<x509v3(3)|x509v3(3)>
4059191Skris
4159191Skris=item AUTHENTICATION CODES, HASH FUNCTIONS
4259191Skris
4368651SkrisL<hmac(3)|hmac(3)>, L<md2(3)|md2(3)>, L<md4(3)|md4(3)>,
4468651SkrisL<md5(3)|md5(3)>, L<mdc2(3)|mdc2(3)>, L<ripemd(3)|ripemd(3)>,
4568651SkrisL<sha(3)|sha(3)>
4659191Skris
4759191Skris=item AUXILIARY FUNCTIONS
4859191Skris
49100928SnectarL<err(3)|err(3)>, L<threads(3)|threads(3)>, L<rand(3)|rand(3)>,
50100928SnectarL<OPENSSL_VERSION_NUMBER(3)|OPENSSL_VERSION_NUMBER(3)>
5159191Skris
5259191Skris=item INPUT/OUTPUT, DATA ENCODING
5359191Skris
5459191SkrisL<asn1(3)|asn1(3)>, L<bio(3)|bio(3)>, L<evp(3)|evp(3)>, L<pem(3)|pem(3)>,
5559191SkrisL<pkcs7(3)|pkcs7(3)>, L<pkcs12(3)|pkcs12(3)> 
5659191Skris
5759191Skris=item INTERNAL FUNCTIONS
5859191Skris
5959191SkrisL<bn(3)|bn(3)>, L<buffer(3)|buffer(3)>, L<lhash(3)|lhash(3)>,
6059191SkrisL<objects(3)|objects(3)>, L<stack(3)|stack(3)>,
6159191SkrisL<txt_db(3)|txt_db(3)> 
6259191Skris
6359191Skris=back
6459191Skris
65109998Smarkm=head1 NOTES
66109998Smarkm
67109998SmarkmSome of the newer functions follow a naming convention using the numbers
68109998SmarkmB<0> and B<1>. For example the functions:
69109998Smarkm
70109998Smarkm int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
71109998Smarkm int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
72109998Smarkm
73109998SmarkmThe B<0> version uses the supplied structure pointer directly
74109998Smarkmin the parent and it will be freed up when the parent is freed.
75109998SmarkmIn the above example B<crl> would be freed but B<rev> would not.
76109998Smarkm
77109998SmarkmThe B<1> function uses a copy of the supplied structure pointer
78109998Smarkm(or in some cases increases its link count) in the parent and
79109998Smarkmso both (B<x> and B<obj> above) should be freed up.
80109998Smarkm
8159191Skris=head1 SEE ALSO
8259191Skris
8359191SkrisL<openssl(1)|openssl(1)>, L<ssl(3)|ssl(3)>
8459191Skris
8559191Skris=cut
86