NAME
crypto — OpenSSL cryptographic library
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.
SEE ALSO
openssl(1), ssl(3)
