C_REHASH(1) OpenSSL C_REHASH(1) NNAAMMEE c_rehash - Create symbolic links to files named by the hash values SSYYNNOOPPSSIISS cc__rreehhaasshh [ _d_i_r_e_c_t_o_r_y...] DDEESSCCRRIIPPTTIIOONN cc__rreehhaasshh scans directories and calculates a hash value of each ".pem" file in the specified directory list and creates symbolic links for each file, where the name of the link is the hash value. This utility is useful as many programs that use OpenSSL require directories to be set up like this in order to find certificates. If any directories are named on the command line, then those are pro- cessed in turn. If not, then the SSSSLL__CCEERRTT__DDIIRR environment variable is consulted; this shold be a colon-separated list of directories, like the Unix PPAATTHH variable. If that is not set then the default directory (installation-specific but often //uussrr//llooccaall//ssssll//cceerrttss) is processed. In order for a directory to be processed, the user must have write per- missions on that directory, otherwise it will be skipped. The links created are of the form "HHHHHHHH.D", where each HH is a hexadecimal character and DD is a single decimal digit. When processing a direc- tory, cc__rreehhaasshh will first remove all links that have a name in that syntax. If you have links in that format used for other purposes, they will be removed. Hashes for CRL's look similar except the letter rr appears after the period, like this: "HHHHHHHH.rD". Multiple objects may have the same hash; they will be indicated by incrementing the DD value. Duplicates are found by comparing the full SHA-1 fingerprint. A warning will be displayed if a duplicate is found. A warning will also be displayed if there are ..ppeemm files that cannot be parsed as either a certificate or a CRL. The program uses the ooppeennssssll program to compute the hashes and finger- prints. If not found in the user's PPAATTHH, then set the OOPPEENNSSSSLL environ- ment variable to the full pathname. Any program can be used, it will be invoked as follows for either a certificate or CRL: $OPENSSL x509 -hash -fingerprint -noout -in FFFFFF $OPENSSL crl -hash -fingerprint -noout -in FFFFFF where FFFFFFFFFFFF is the filename. It must output the hash of the file on the first line, and the fingerprint on the second, optionally prefixed with some text and an equals sign. EENNVVIIRROONNMMEENNTT OOPPEENNSSSSLL The path to an executable to use to generate hashes and finger- prints (see above). SSSSLL__CCEERRTT__DDIIRR Colon separated list of directories to operate on. Ignored if directories are listed on the command line. SSEEEE AALLSSOO _o_p_e_n_s_s_l(1), _c_r_l(1). _x_5_0_9(1). 1.0.1u 2016-09-22 C_REHASH(1)