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    Command:

    crypto

    
    
    

    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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