DGST 1 2005-03-25 0.9.9-dev OpenSSL

NAME

dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests

LIBRARY

libcrypto, -lcrypto

SYNOPSIS

ooppeennssssll ddggsstt [--mmdd55||--mmdd44||--mmdd22||--sshhaa11||--sshhaa||--mmddcc22||--rriippeemmdd116600||--ddssss11] [--cc] [--dd] [--hheexx] [--bbiinnaarryy] [--oouutt ffiilleennaammee] [--ssiiggnn ffiilleennaammee] [--ppaassssiinn aarrgg] [--vveerriiffyy ffiilleennaammee] [--pprrvveerriiffyy ffiilleennaammee] [--ssiiggnnaattuurree ffiilleennaammee] [ffiillee......]

[mmdd55||mmdd44||mmdd22||sshhaa11||sshhaa||mmddcc22||rriippeemmdd116600] [--cc] [--dd] [ffiillee......]

DESCRIPTION

The digest functions output the message digest of a supplied file or files in hexadecimal form. They can also be used for digital signing and verification.

OPTIONS

--cc print out the digest in two digit groups separated by colons, only relevant if
hheexx format output is used.
--dd print out BIO debugging information.
--hheexx digest is to be output as a hex dump. This is the default case for a "normal"
digest as opposed to a digital signature.
--bbiinnaarryy output the digest or signature in binary form.
--oouutt ffiilleennaammee filename to output to, or standard output by default.
--ssiiggnn ffiilleennaammee digitally sign the digest using the private key in "filename".
--ppaassssiinn aarrgg the private key password source. For more information about the format of aarrgg
see the PPAASSSS PPHHRRAASSEE AARRGGUUMMEENNTTSS section in _o_p_e_n_s_s_l(1).
--vveerriiffyy ffiilleennaammee verify the signature using the the public key in "filename".
The output is either "Verification OK" or "Verification Failure".
--pprrvveerriiffyy ffiilleennaammee verify the signature using the the private key in "filename".
--ssiiggnnaattuurree ffiilleennaammee the actual signature to verify.
--rraanndd ffiillee((ss)) a file or files containing random data used to seed the random number
generator, or an EGD socket (see _R_A_N_D___e_g_d(3)). Multiple files can be specified separated by a OS-dependent character. The separator is ;; for MS-Windows, ,, for OpenVMS, and :: for all others.
ffiillee...... file or files to digest. If no files are specified then standard input is
used.

NOTES

The digest of choice for all new applications is SHA1. Other digests are however still widely used.

If you wish to sign or verify data using the DSA algorithm then the dss1 digest must be used.

A source of random numbers is required for certain signing algorithms, in particular DSA.

The signing and verify options should only be used if a single file is being signed or verified.