dgst, sha, sha1, mdc2, ripemd160, sha224, sha256, sha384, sha512, md2, md4, md5, dss1 - message digests
openssl dgst [-sha|-sha1|-mdc2|-ripemd160|-sha224|-sha256|-sha384|-sha512|-md2|-md4|-md5|-dss1] [-c] [-d] [-hex] [-binary] [-r] [-non-fips-allow] [-out filename] [-sign filename] [-keyform arg] [-passin arg] [-verify filename] [-prverify filename] [-signature filename] [-hmac key] [-non-fips-allow] [-fips-fingerprint] [file...] openssl [digest] [...]
The digest functions output the message digest of a supplied file or files in hexadecimal. The digest functions also generate and verify digital signatures using message digests.
-c print out the digest in two digit groups separated by colons, only relevant if hex format output is used. -d print out BIO debugging information. -hex digest is to be output as a hex dump. This is the default case for a "normal" digest as opposed to a digital signature. See NOTES below for digital signatures using -hex. -binary output the digest or signature in binary form. -r output the digest in the "coreutils" format used by programs like sha1sum. -non-fips-allow Allow use of non FIPS digest when in FIPS mode. This has no effect when not in FIPS mode. -out filename filename to output to, or standard output by default. -sign filename digitally sign the digest using the private key in "filename". -keyform arg Specifies the key format to sign digest with. The DER, PEM, P12, and ENGINE formats are supported. -engine id Use engine id for operations (including private key storage). This engine is not used as source for digest algorithms, unless it is also specified in the configuration file. -sigopt nm:v Pass options to the signature algorithm during sign or verify operations. Names and values of these options are algorithm- specific. -passin arg the private key password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl(1). -verify filename verify the signature using the the public key in "filename". The output is either "Verification OK" or "Verification Failure". -prverify filename verify the signature using the the private key in "filename". -signature filename the actual signature to verify. -hmac key create a hashed MAC using "key". -mac alg create MAC (keyed Message Authentication Code). The most popular MAC algorithm is HMAC (hash-based MAC), but there are other MAC algorithms which are not based on hash, for instance gost-mac algorithm, supported by ccgost engine. MAC keys and other options should be set via -macopt parameter. -macopt nm:v Passes options to MAC algorithm, specified by -mac key. Following options are supported by both by HMAC and gost-mac: key:string Specifies MAC key as alphnumeric string (use if key contain printable characters only). String length must conform to any restrictions of the MAC algorithm for example exactly 32 chars for gost-mac. hexkey:string Specifies MAC key in hexadecimal form (two hex digits per byte). Key length must conform to any restrictions of the MAC algorithm for example exactly 32 chars for gost-mac. -rand file(s) a file or files containing random data used to seed the random number generator, or an EGD socket (see RAND_egd(3)). Multiple files can be specified separated by a OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others. -non-fips-allow enable use of non-FIPS algorithms such as MD5 even in FIPS mode. -fips-fingerprint compute HMAC using a specific key for certain OpenSSL-FIPS operations. file... file or files to digest. If no files are specified then standard input is used.
To create a hex-encoded message digest of a file: openssl dgst -md5 -hex file.txt To sign a file using SHA-256 with binary file output: openssl dgst -sha256 -sign privatekey.pem -out signature.sign file.txt To verify a signature: openssl dgst -sha256 -verify publickey.pem \ -signature signature.sign \ file.txt
The digest of choice for all new applications is SHA1. Other digests are however still widely used. When signing a file, dgst will automatically determine the algorithm (RSA, ECC, etc) to use for signing based on the private key's ASN.1 info. When verifying signatures, it only handles the RSA, DSA, or ECDSA signature itself, not the related data to identify the signer and algorithm used in formats such as x.509, CMS, and S/MIME. A source of random numbers is required for certain signing algorithms, in particular ECDSA and DSA. The signing and verify options should only be used if a single file is being signed or verified. Hex signatures cannot be verified using openssl. Instead, use "xxd -r" or similar program to transform the hex signature into a binary signature prior to verification.
More Linux Commands
FcNameParse(3) - Parse a pattern string - Linux manual page
Converts name from the standard text format described above into a pattern. VERSION Fontconfig version 2.8.0 FcNameParse.3 .....(Library - Linux manual page)
getsyx(3ncurses) - low-level curses routines (Man Page).....
The following routines give low-level access to various curses capabilities. These routines typically are used inside library routines. The def_prog_mode and de
next(n) invoke superclass method implementations (Man Page)
The next command is used to call implementations of a method by a class, superclass or mixin that are overridden by the current method. It can only be used from
XGetSelectionOwner(3) - manipulate window selection.........
The XSetSelectionOwner function changes the owner and last-change time for the specified selection and has no effect if the specified time is earlier than the c
info(n) - Return information about the state of the Tcl inte
This command provides information about various internals of the Tcl interpreter. The legal options (which may be abbreviated) are: info args procname Returns a
fsck.cramfs(8) fsck compressed ROM file system (Man Page)...
fsck.cramfs is used to check the cramfs file system. OPTIONS -v, --verbose Enable verbose messaging. -b, --blocksize blocksize Use this blocksize, defaults to p
Tcl_FSDeleteFile(3) - procedures to interact with any filesy
There are several reasons for calling the Tcl_FS API functions (e.g. Tcl_FSAccess and Tcl_FSStat) rather than calling system level functions like access and sta
setjmp(3) - save stack context for nonlocal goto (Man Page)
setjmp() and longjmp(3) are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. setjmp() saves the stack context/e
Tcl_GetVar2Ex(3) - manipulate Tcl variables - Linux man page
These procedures are used to create, modify, read, and delete Tcl variables from C code. Tcl_SetVar2Ex, Tcl_SetVar, Tcl_SetVar2, and Tcl_ObjSetVar2 will create
news2mail(8) - Channel script to gateway news into e-mails
news2mail runs as a channel process underneath innd. It is set up as channel feed in newsfeeds, with different mailing-lists as funnel entries pointing to it (s
vline(3ncurses) - create curses borders, horizontal and vert
The border, wborder and box routines draw a box around the edges of a window. Other than the window, each argument is a character with attributes: ls - left sid
cacaplay(1) - play libcaca files (Commands - Linux man page)
cacaplay plays libcaca animation files. These files can be created by any libcaca program by setting the CACA_DRIVER environment variable to raw and storing the