Provided by: tcllib_1.20+dfsg-1_all 
NAME
pki - Implementation of the public key cipher
SYNOPSIS
package require Tcl 8.5
package require pki ?0.10?
::pki::encrypt ?-binary? ?-hex? ?-pad? ?-nopad? ?-priv? ?-pub? ?--? input key
::pki::decrypt ?-binary? ?-hex? ?-unpad? ?-nounpad? ?-priv? ?-pub? ?--? input key
::pki::sign input key ?algo?
::pki::verify signedmessage plaintext key ?algo?
::pki::key key ?password? ?encodePem?
::pki::pkcs::parse_key key ?password?
::pki::x509::parse_cert cert
::pki::rsa::generate bitlength ?exponent?
::pki::x509::verify_cert cert trustedcerts ?intermediatecerts?
::pki::x509::validate_cert cert ?-sign_message dn_of_signer? ?-encrypt_message
dn_of_signer? ?-sign_cert dn_to_be_signed ca_depth? ?-ssl dn?
::pki::pkcs::create_csr keylist namelist ?encodePem? ?algo?
::pki::pkcs::parse_csr csr
::pki::x509::create_cert signreqlist cakeylist serial_number notBefore notAfter isCA
extensions ?encodePem? ?algo?
_________________________________________________________________________________________________
DESCRIPTION
COMMANDS
::pki::encrypt ?-binary? ?-hex? ?-pad? ?-nopad? ?-priv? ?-pub? ?--? input key
Encrypt a message using PKI (probably RSA). Requires the caller to specify either
-priv to encrypt with the private key or -pub to encrypt with the public key. The
default option is to pad and return in hex. One of -pub or -priv must be
specified. The -hex option causes the data to be returned in encoded as a
hexidecimal string, while the -binary option causes the data to be returned as a
binary string. If they are specified multiple times, the last one specified is
used. The -pad option causes the data to be padded per PKCS#1 prior to being
encrypted. The -nopad inhibits this behaviour. If they are specified multiple
times, the last one specified is used. The input to encrypt is specified as input.
The key parameter, holding the key to use, is a return value from either
::pki::pkcs::parse_key, ::pki::x509::parse_cert, or ::pki::rsa::generate.
Mapping to OpenSSL's openssl application:
[1] "openssl rsautl -encrypt" == "::pki::encrypt -binary -pub"
[2] "openssl rsautl -sign" == "::pki::encrypt -binary -priv"
::pki::decrypt ?-binary? ?-hex? ?-unpad? ?-nounpad? ?-priv? ?-pub? ?--? input key
Decrypt a message using PKI (probably RSA). See ::pki::encrypt for option handling.
Mapping to OpenSSL's openssl application:
[1] "openssl rsautl -decrypt" == "::pki::decrypt -binary -priv"
[2] "openssl rsautl -verify" == "::pki::decrypt -binary -pub"
::pki::sign input key ?algo?
Digitally sign message input using the private key.
If algo is ommited "sha1" is assumed. Possible values for algo include "md5",
"sha1", "sha256", and "raw".
Specifying "raw" for algo will inhibit the building of an ASN.1 structure to encode
which hashing algorithm was chosen. Attention: In this case the corresponding
pkgi::verify must be called with algorithm information. Conversely, specifying a
non-"raw" algorithm here means that the corresponding pkgi::verify invokation has
to be made without algorithm information.
The input should be the plain text, hashing will be performed on it.
The key should include the private key.
::pki::verify signedmessage plaintext key ?algo?
Verify a digital signature using a public key. Returns true or false.
Attention: The algorithm information algo has to be specified if and only if the
pki::sign which generated the signedmessage was called with algorithm "raw". This
inhibited the building of the ASN.1 structure encoding the chosen hashing
algorithm. Conversely, if a proper algorithm was specified during signing then you
must not specify an algorithm here.
::pki::key key ?password? ?encodePem?
Convert a key structure into a serialized PEM (default) or DER encoded private key
suitable for other applications. For RSA keys this means PKCS#1.
::pki::pkcs::parse_key key ?password?
Convert a PKCS#1 private key into a usable key, i.e. one which can be used as
argument for ::pki::encrypt, ::pki::decrypt, ::pki::sign, and ::pki::verify.
::pki::x509::parse_cert cert
Convert an X.509 certificate to a usable (public) key, i.e. one which can be used
as argument for ::pki:encrypt, ::pki::decrypt, and ::pki::verify. The cert
argument can be either PEM or DER encoded.
::pki::rsa::generate bitlength ?exponent?
Generate a new RSA key pair, the parts of which can be used as argument for
::pki::encrypt, ::pki::decrypt, ::pki::sign, and ::pki::verify. The bitlength
argument is the length of the public key modulus. The exponent argument should
generally not be specified unless you really know what you are doing.
::pki::x509::verify_cert cert trustedcerts ?intermediatecerts?
Verify that a trust can be found between the certificate specified in the cert
argument and one of the certificates specified in the list of certificates in the
trustedcerts argument. (Eventually the chain can be through untrusted certificates
listed in the intermediatecerts argument, but this is currently unimplemented).
The certificates specified in the cert and trustedcerts option should be parsed
(from ::pki::x509::parse_cert).
::pki::x509::validate_cert cert ?-sign_message dn_of_signer? ?-encrypt_message
dn_of_signer? ?-sign_cert dn_to_be_signed ca_depth? ?-ssl dn?
Validate that a certificate is valid to be used in some capacity. If multiple
options are specified they must all be met for this procedure to return "true".
Currently, only the -sign_cert option is functional. Arguments for the -sign_cert
option are dn_to_be_signed and ca_depth. The dn_to_be_signed is the distinguished
from the subject of a certificate to verify that the certificate specified in the
cert argument can sign. The ca_depth argument is used to indicate at which depth
the verification should be done at. Some certificates are limited to how far down
the chain they can be used to verify a given certificate.
::pki::pkcs::create_csr keylist namelist ?encodePem? ?algo?
Generate a certificate signing request from a key pair specified in the keylist
argument. The namelist argument is a list of "name" followed by "value" pairs to
encoding as the requested distinguished name in the CSR. The encodePem option
specifies whether or not the result should be PEM encoded or DER encoded. A "true"
value results in the result being PEM encoded, while any other value 9results in
the the result being DER encoded. DER encoding is the default. The algo argument
specifies the hashing algorithm we should use to sign this certificate signing
request with. The default is "sha1". Other possible values include "md5" and
"sha256".
::pki::pkcs::parse_csr csr
Parse a Certificate Signing Request. The csr argument can be either PEM or DER
encoded.
::pki::x509::create_cert signreqlist cakeylist serial_number notBefore notAfter isCA
extensions ?encodePem? ?algo?
Sign a signing request (usually from ::pki::pkcs::create_csr or
::pki::pkcs::parse_csr) with a Certificate Authority (CA) certificate. The
signreqlist argument should be the parsed signing request. The cakeylist argument
should be the parsed CA certificate. The serial_number argument should be a serial
number unique to this certificate from this certificate authority. The notBefore
and notAfter arguments should contain the time before and after which
(respectively) the certificate should be considered invalid. The time should be
encoded as something clock format will accept (i.e., the results of clock seconds
and clock add). The isCA argument is a boolean argumen describing whether or not
the signed certificate should be a a CA certificate. If specified as true the "id-
ce-basicConstraints" extension is added with the arguments of "critical" being
true, "allowCA" being true, and caDepth being -1 (infinite). The extensions
argument is a list of extensions and their parameters that should be encoded into
the created certificate. Currently only one extension is understood ("id-ce-
basicConstraints"). It accepts three arguments critical allowCA caDepth. The
critical argument to this extension (and any extension) whether or not the
validator should reject the certificate as invalid if it does not understand the
extension (if set to "true") or should ignore the extension (if set to "false").
The allowCA argument is used to specify as a boolean value whether or not we can be
used a certificate authority (CA). The caDepth argument indicates how many
children CAs can be children of this CA in a depth-wise fashion. A value of "0"
for the caDepth argument means that this CA cannot sign a CA certificate and have
the result be valid. A value of "-1" indicates infinite depth.
EXAMPLES
REFERENCES
[1]
AUTHORS
Roy Keene
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other
problems. Please report such in the category rsa of the Tcllib Trackers
[http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for enhancements you
may have for either package and/or documentation.
When proposing code changes, please provide unified diffs, i.e the output of diff -u.
Note further that attachments are strongly preferred over inlined patches. Attachments can
be made by going to the Edit form of the ticket immediately after its creation, and then
using the left-most button in the secondary navigation bar.
SEE ALSO
aes(3tcl), blowfish(3tcl), des(3tcl), md5(3tcl), sha1(3tcl)
KEYWORDS
cipher, data integrity, encryption, public key cipher, rsa, security
CATEGORY
Hashes, checksums, and encryption
COPYRIGHT
Copyright (c) 2010, 2011, 2012, 2013, Roy Keene, Andreas Kupries