02-27-2017
Encrypt and Decrypt a File with Password
Hello,
I have few files on unix which are payroll related and I need them to encrypt with password so others wouldn't see the data. I use ETL tool and would like to know the unix command that does encryption/decryption to use in the ETL.
Thank you,
Sri
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LEARN ABOUT CENTOS
encrypt
ENCRYPT(3P) POSIX Programmer's Manual ENCRYPT(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
encrypt - encoding function (CRYPT)
SYNOPSIS
#include <unistd.h>
void encrypt(char block[64], int edflag);
DESCRIPTION
The encrypt() function shall provide access to an implementation-defined encoding algorithm. The key generated by setkey() is used to
encrypt the string block with encrypt().
The block argument to encrypt() shall be an array of length 64 bytes containing only the bytes with values of 0 and 1. The array is modi-
fied in place to a similar array using the key set by setkey(). If edflag is 0, the argument is encoded. If edflag is 1, the argument may
be decoded (see the APPLICATION USAGE section); if the argument is not decoded, errno shall be set to [ENOSYS].
The encrypt() function shall not change the setting of errno if successful. An application wishing to check for error situations should set
errno to 0 before calling encrypt(). If errno is non-zero on return, an error has occurred.
The encrypt() function need not be reentrant. A function that is not required to be reentrant is not required to be thread-safe.
RETURN VALUE
The encrypt() function shall not return a value.
ERRORS
The encrypt() function shall fail if:
ENOSYS The functionality is not supported on this implementation.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
Historical implementations of the encrypt() function used a rather primitive encoding algorithm.
In some environments, decoding might not be implemented. This is related to some Government restrictions on encryption and decryption rou-
tines. Historical practice has been to ship a different version of the encryption library without the decryption feature in the routines
supplied. Thus the exported version of encrypt() does encoding but not decoding.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
crypt(), setkey(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 ENCRYPT(3P)