Merge OpenSSL 1.0.1j.
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secure/usr.bin/openssl/man/c_rehash.1
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.\" ========================================================================
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.\"
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.IX Title "C_REHASH 1"
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.TH C_REHASH 1 "2014-10-15" "1.0.1j" "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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c_rehash \- Create symbolic links to files named by the hash values
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBc_rehash\fR
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[ \fIdirectory\fR...]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBc_rehash\fR scans directories and calculates a hash value of each \f(CW\*(C`.pem\*(C'\fR
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file in the specified directory list and creates symbolic links
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for each file, where the name of the link is the hash value.
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This utility is useful as many programs that use OpenSSL require
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directories to be set up like this in order to find certificates.
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.PP
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If any directories are named on the command line, then those are
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processed in turn. If not, then the \fB\s-1SSL_CERT_DIR\s0\fR environment variable
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is consulted; this shold be a colon-separated list of directories,
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like the Unix \fB\s-1PATH\s0\fR variable.
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If that is not set then the default directory (installation-specific
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but often \fB/usr/local/ssl/certs\fR) is processed.
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.PP
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In order for a directory to be processed, the user must have write
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permissions on that directory, otherwise it will be skipped.
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The links created are of the form \f(CW\*(C`HHHHHHHH.D\*(C'\fR, where each \fBH\fR
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is a hexadecimal character and \fBD\fR is a single decimal digit.
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When processing a directory, \fBc_rehash\fR will first remove all links
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that have a name in that syntax. If you have links in that format
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used for other purposes, they will be removed.
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Hashes for \s-1CRL\s0's look similar except the letter \fBr\fR appears after
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the period, like this: \f(CW\*(C`HHHHHHHH.rD\*(C'\fR.
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.PP
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Multiple objects may have the same hash; they will be indicated by
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incrementing the \fBD\fR value. Duplicates are found by comparing the
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full \s-1SHA\-1\s0 fingerprint. A warning will be displayed if a duplicate
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is found.
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.PP
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A warning will also be displayed if there are \fB.pem\fR files that
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cannot be parsed as either a certificate or a \s-1CRL\s0.
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.PP
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The program uses the \fBopenssl\fR program to compute the hashes and
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fingerprints. If not found in the user's \fB\s-1PATH\s0\fR, then set the
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\&\fB\s-1OPENSSL\s0\fR environment variable to the full pathname.
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Any program can be used, it will be invoked as follows for either
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a certificate or \s-1CRL:\s0
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.PP
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.Vb 2
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\& $OPENSSL x509 \-hash \-fingerprint \-noout \-in FFFFFF
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\& $OPENSSL crl \-hash \-fingerprint \-noout \-in FFFFFF
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.Ve
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.PP
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where \fB\s-1FFFFFF\s0\fR is the filename. It must output the hash of the
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file on the first line, and the fingerprint on the second,
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optionally prefixed with some text and an equals sign.
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.SH "ENVIRONMENT"
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.IX Header "ENVIRONMENT"
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.IP "\fB\s-1OPENSSL\s0\fR" 4
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.IX Item "OPENSSL"
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The path to an executable to use to generate hashes and
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fingerprints (see above).
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.IP "\fB\s-1SSL_CERT_DIR\s0\fR" 4
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.IX Item "SSL_CERT_DIR"
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Colon separated list of directories to operate on.
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Ignored if directories are listed on the command line.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIopenssl\fR\|(1),
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\&\fIcrl\fR\|(1).
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\&\fIx509\fR\|(1).
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