mirror of
https://github.com/openssl/openssl.git
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86 lines
2.0 KiB
Plaintext
86 lines
2.0 KiB
Plaintext
=pod
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=head1 NAME
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crypto - OpenSSL cryptographic library
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=head1 SYNOPSIS
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=head1 DESCRIPTION
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The OpenSSL B<crypto> library implements a wide range of cryptographic
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algorithms used in various Internet standards. The services provided
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by this library are used by the OpenSSL implementations of SSL, TLS
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and S/MIME, and they have also been used to implement SSH, OpenPGP, and
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other cryptographic standards.
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=head1 OVERVIEW
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B<libcrypto> consists of a number of sub-libraries that implement the
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individual algorithms.
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The functionality includes symmetric encryption, public key
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cryptography and key agreement, certificate handling, cryptographic
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hash functions and a cryptographic pseudo-random number generator.
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=over 4
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=item SYMMETRIC CIPHERS
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L<blowfish(3)>, L<cast(3)>, L<des(3)>,
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L<idea(3)>, L<rc2(3)>, L<rc4(3)>, L<rc5(3)>
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=item PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT
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L<dsa(3)>, L<dh(3)>, L<ec(3)>, L<rsa(3)>
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=item CERTIFICATES
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L<x509(3)>, L<x509v3(3)>
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=item AUTHENTICATION CODES, HASH FUNCTIONS
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L<hmac(3)>, L<md2(3)>, L<md4(3)>,
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L<md5(3)>, L<mdc2(3)>, L<ripemd(3)>,
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L<sha(3)>
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=item AUXILIARY FUNCTIONS
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L<err(3)>, L<threads(3)>, L<rand(3)>,
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L<OPENSSL_VERSION_NUMBER(3)>
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=item INPUT/OUTPUT, DATA ENCODING
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L<asn1(3)>, L<bio(3)>, L<evp(3)>, L<pem(3)>,
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L<pkcs7(3)>, L<pkcs12(3)>
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=item UTILITY FUNCTIONS
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L<bn(3)>, L<buffer(3)>, L<lhash(3)>,
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L<objects(3)>, L<stack(3)>,
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L<txt_db(3)>
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=back
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=head1 NOTES
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Some of the newer functions follow a naming convention using the numbers
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B<0> and B<1>. For example the functions:
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int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
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int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
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The B<0> version uses the supplied structure pointer directly
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in the parent and it will be freed up when the parent is freed.
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In the above example B<crl> would be freed but B<rev> would not.
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The B<1> function uses a copy of the supplied structure pointer
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(or in some cases increases its link count) in the parent and
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so both (B<x> and B<obj> above) should be freed up.
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=head1 SEE ALSO
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L<openssl(1)>, L<ssl(3)>
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=cut
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