crypto
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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.
      
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