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.\" ========================================================================
.\"
.IX Title "crypto 3"
.TH crypto 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
crypto \- OpenSSL cryptographic library
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The OpenSSL \fBcrypto\fR 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 \s-1SSL, TLS\s0
and S/MIME, and they have also been used to implement \s-1SSH,\s0 OpenPGP, and
other cryptographic standards.
.SH "OVERVIEW"
.IX Header "OVERVIEW"
\&\fBlibcrypto\fR consists of a number of sub-libraries that implement the
individual algorithms.
.PP
The functionality includes symmetric encryption, public key
cryptography and key agreement, certificate handling, cryptographic
hash functions and a cryptographic pseudo-random number generator.
.IP "\s-1SYMMETRIC CIPHERS\s0" 4
.IX Item "SYMMETRIC CIPHERS"
\&\fIblowfish\fR\|(3), \fIcast\fR\|(3), \fIdes\fR\|(3),
\&\fIidea\fR\|(3), \fIrc2\fR\|(3), \fIrc4\fR\|(3), \fIrc5\fR\|(3)
.IP "\s-1PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT\s0" 4
.IX Item "PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT"
\&\fIdsa\fR\|(3), \fIdh\fR\|(3), \fIrsa\fR\|(3)
.IP "\s-1CERTIFICATES\s0" 4
.IX Item "CERTIFICATES"
\&\fIx509\fR\|(3), \fIx509v3\fR\|(3)
.IP "\s-1AUTHENTICATION CODES, HASH FUNCTIONS\s0" 4
.IX Item "AUTHENTICATION CODES, HASH FUNCTIONS"
\&\fIhmac\fR\|(3), \fImd2\fR\|(3), \fImd4\fR\|(3),
\&\fImd5\fR\|(3), \fImdc2\fR\|(3), \fIripemd\fR\|(3),
\&\fIsha\fR\|(3)
.IP "\s-1AUXILIARY FUNCTIONS\s0" 4
.IX Item "AUXILIARY FUNCTIONS"
\&\fIerr\fR\|(3), \fIthreads\fR\|(3), \fIrand\fR\|(3),
\&\s-1\fIOPENSSL_VERSION_NUMBER\s0\fR\|(3)
.IP "\s-1INPUT/OUTPUT, DATA ENCODING\s0" 4
.IX Item "INPUT/OUTPUT, DATA ENCODING"
\&\fIasn1\fR\|(3), \fIbio\fR\|(3), \fIevp\fR\|(3), \fIpem\fR\|(3),
\&\fIpkcs7\fR\|(3), \fIpkcs12\fR\|(3)
.IP "\s-1INTERNAL FUNCTIONS\s0" 4
.IX Item "INTERNAL FUNCTIONS"
\&\fIbn\fR\|(3), \fIbuffer\fR\|(3), \fIec\fR\|(3), \fIlhash\fR\|(3),
\&\fIobjects\fR\|(3), \fIstack\fR\|(3),
\&\fItxt_db\fR\|(3)
.SH "NOTES"
.IX Header "NOTES"
Some of the newer functions follow a naming convention using the numbers
\&\fB0\fR and \fB1\fR. For example the functions:
.PP
.Vb 2
\& int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
\& int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
.Ve
.PP
The \fB0\fR 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 \fBcrl\fR would be freed but \fBrev\fR would not.
.PP
The \fB1\fR function uses a copy of the supplied structure pointer
(or in some cases increases its link count) in the parent and
so both (\fBx\fR and \fBobj\fR above) should be freed up.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIopenssl\fR\|(1), \fIssl\fR\|(3)

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