CRYPTO(3) OpenSSL CRYPTO(3)
crypto - OpenSSL cryptographic library
The OpenSSL crypto library implements a wide range of cryp-
tographic 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.
libcrypto consists of a number of sub-libraries that imple-
ment the individual algorithms.
The functionality includes symmetric encryption, public key
cryptography and key agreement, certificate handling, cryp-
tographic hash functions and a cryptographic pseudo-random
number generator.
SYMMETRIC CIPHERS
blowfish(3), cast(3), des(3), rc2(3), rc4(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), 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)
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
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CRYPTO(3) OpenSSL CRYPTO(3)
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.
openssl(1), ssl(3)
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