204 lines
6.5 KiB
Groff
204 lines
6.5 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "crypto 3"
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.TH crypto 3 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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crypto \- OpenSSL cryptographic library
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The OpenSSL \fBcrypto\fR library implements a wide range of cryptographic
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algorithms used in various Internet standards. The services provided
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by this library are used by the OpenSSL implementations of \s-1SSL, TLS\s0
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and S/MIME, and they have also been used to implement \s-1SSH,\s0 OpenPGP, and
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other cryptographic standards.
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.SH "OVERVIEW"
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.IX Header "OVERVIEW"
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\&\fBlibcrypto\fR consists of a number of sub-libraries that implement the
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individual algorithms.
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.PP
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The functionality includes symmetric encryption, public key
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cryptography and key agreement, certificate handling, cryptographic
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hash functions and a cryptographic pseudo-random number generator.
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.IP "\s-1SYMMETRIC CIPHERS\s0" 4
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.IX Item "SYMMETRIC CIPHERS"
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\&\fIblowfish\fR\|(3), \fIcast\fR\|(3), \fIdes\fR\|(3),
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\&\fIidea\fR\|(3), \fIrc2\fR\|(3), \fIrc4\fR\|(3), \fIrc5\fR\|(3)
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.IP "\s-1PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT\s0" 4
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.IX Item "PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT"
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\&\fIdsa\fR\|(3), \fIdh\fR\|(3), \fIrsa\fR\|(3)
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.IP "\s-1CERTIFICATES\s0" 4
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.IX Item "CERTIFICATES"
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\&\fIx509\fR\|(3), \fIx509v3\fR\|(3)
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.IP "\s-1AUTHENTICATION CODES, HASH FUNCTIONS\s0" 4
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.IX Item "AUTHENTICATION CODES, HASH FUNCTIONS"
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\&\fIhmac\fR\|(3), \fImd2\fR\|(3), \fImd4\fR\|(3),
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\&\fImd5\fR\|(3), \fImdc2\fR\|(3), \fIripemd\fR\|(3),
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\&\fIsha\fR\|(3)
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.IP "\s-1AUXILIARY FUNCTIONS\s0" 4
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.IX Item "AUXILIARY FUNCTIONS"
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\&\fIerr\fR\|(3), \fIthreads\fR\|(3), \fIrand\fR\|(3),
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\&\s-1\fIOPENSSL_VERSION_NUMBER\s0\fR\|(3)
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.IP "\s-1INPUT/OUTPUT, DATA ENCODING\s0" 4
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.IX Item "INPUT/OUTPUT, DATA ENCODING"
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\&\fIasn1\fR\|(3), \fIbio\fR\|(3), \fIevp\fR\|(3), \fIpem\fR\|(3),
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\&\fIpkcs7\fR\|(3), \fIpkcs12\fR\|(3)
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.IP "\s-1INTERNAL FUNCTIONS\s0" 4
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.IX Item "INTERNAL FUNCTIONS"
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\&\fIbn\fR\|(3), \fIbuffer\fR\|(3), \fIec\fR\|(3), \fIlhash\fR\|(3),
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\&\fIobjects\fR\|(3), \fIstack\fR\|(3),
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\&\fItxt_db\fR\|(3)
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.SH "NOTES"
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.IX Header "NOTES"
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Some of the newer functions follow a naming convention using the numbers
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\&\fB0\fR and \fB1\fR. For example the functions:
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.PP
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.Vb 2
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\& int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
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\& int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
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.Ve
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.PP
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The \fB0\fR version uses the supplied structure pointer directly
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in the parent and it will be freed up when the parent is freed.
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In the above example \fBcrl\fR would be freed but \fBrev\fR would not.
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.PP
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The \fB1\fR function uses a copy of the supplied structure pointer
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(or in some cases increases its link count) in the parent and
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so both (\fBx\fR and \fBobj\fR above) should be freed up.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIopenssl\fR\|(1), \fIssl\fR\|(3)
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