openssl: Adjust manual pages for 1.0.1h.
[dragonfly.git] / secure / usr.bin / openssl / man / cms.1
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124.\" ========================================================================
126.IX Title "CMS 1"
34240b21 127.TH CMS 1 "2014-06-05" "1.0.1h" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
132.SH "NAME"
133cms \- CMS utility
135.IX Header "SYNOPSIS"
136\&\fBopenssl\fR \fBcms\fR
151[\fB\-verify_receipt receipt\fR]
152[\fB\-in filename\fR]
153[\fB\-inform SMIME|PEM|DER\fR]
154[\fB\-rctform SMIME|PEM|DER\fR]
155[\fB\-out filename\fR]
156[\fB\-outform SMIME|PEM|DER\fR]
157[\fB\-stream \-indef \-noindef\fR]
159[\fB\-content filename\fR]
163[\fB\-CAfile file\fR]
164[\fB\-CApath dir\fR]
165[\fB\-md digest\fR]
174[\fB\-certfile file\fR]
175[\fB\-certsout file\fR]
176[\fB\-signer file\fR]
177[\fB\-recip file\fR]
179[\fB\-receipt_request_all \-receipt_request_first\fR]
180[\fB\-receipt_request_from emailaddress\fR]
181[\fB\-receipt_request_to emailaddress\fR]
183[\fB\-secretkey key\fR]
184[\fB\-secretkeyid id\fR]
185[\fB\-econtent_type type\fR]
186[\fB\-inkey file\fR]
187[\fB\-passin arg\fR]
188[\fB\-rand file(s)\fR]
190[\fB\-to addr\fR]
191[\fB\-from addr\fR]
192[\fB\-subject subj\fR]
196The \fBcms\fR command handles S/MIME v3.1 mail. It can encrypt, decrypt, sign and
197verify, compress and uncompress S/MIME messages.
200There are fourteen operation options that set the type of operation to be
201performed. The meaning of the other options varies according to the operation
203.IP "\fB\-encrypt\fR" 4
204.IX Item "-encrypt"
205encrypt mail for the given recipient certificates. Input file is the message
206to be encrypted. The output file is the encrypted mail in \s-1MIME\s0 format. The
207actual \s-1CMS\s0 type is <B>EnvelopedData<B>.
208.IP "\fB\-decrypt\fR" 4
209.IX Item "-decrypt"
210decrypt mail using the supplied certificate and private key. Expects an
211encrypted mail message in \s-1MIME\s0 format for the input file. The decrypted mail
212is written to the output file.
213.IP "\fB\-debug_decrypt\fR" 4
214.IX Item "-debug_decrypt"
215this option sets the \fB\s-1CMS_DEBUG_DECRYPT\s0\fR flag. This option should be used
216with caution: see the notes section below.
217.IP "\fB\-sign\fR" 4
218.IX Item "-sign"
219sign mail using the supplied certificate and private key. Input file is
220the message to be signed. The signed message in \s-1MIME\s0 format is written
221to the output file.
222.IP "\fB\-verify\fR" 4
223.IX Item "-verify"
224verify signed mail. Expects a signed mail message on input and outputs
225the signed data. Both clear text and opaque signing is supported.
226.IP "\fB\-cmsout\fR" 4
227.IX Item "-cmsout"
228takes an input message and writes out a \s-1PEM\s0 encoded \s-1CMS\s0 structure.
229.IP "\fB\-resign\fR" 4
230.IX Item "-resign"
231resign a message: take an existing message and one or more new signers.
232.IP "\fB\-data_create\fR" 4
233.IX Item "-data_create"
234Create a \s-1CMS\s0 \fBData\fR type.
235.IP "\fB\-data_out\fR" 4
236.IX Item "-data_out"
237\&\fBData\fR type and output the content.
238.IP "\fB\-digest_create\fR" 4
239.IX Item "-digest_create"
240Create a \s-1CMS\s0 \fBDigestedData\fR type.
241.IP "\fB\-digest_verify\fR" 4
242.IX Item "-digest_verify"
243Verify a \s-1CMS\s0 \fBDigestedData\fR type and output the content.
244.IP "\fB\-compress\fR" 4
245.IX Item "-compress"
246Create a \s-1CMS\s0 \fBCompressedData\fR type. OpenSSL must be compiled with \fBzlib\fR
247support for this option to work, otherwise it will output an error.
248.IP "\fB\-uncompress\fR" 4
249.IX Item "-uncompress"
250Uncompress a \s-1CMS\s0 \fBCompressedData\fR type and output the content. OpenSSL must be
251compiled with \fBzlib\fR support for this option to work, otherwise it will
252output an error.
253.IP "\fB\-EncryptedData_encrypt\fR" 4
254.IX Item "-EncryptedData_encrypt"
255Encrypt suppled content using supplied symmetric key and algorithm using a \s-1CMS\s0
256\&\fBEncrytedData\fR type and output the content.
257.IP "\fB\-sign_receipt\fR" 4
258.IX Item "-sign_receipt"
259Generate and output a signed receipt for the supplied message. The input
260message \fBmust\fR contain a signed receipt request. Functionality is otherwise
261similar to the \fB\-sign\fR operation.
262.IP "\fB\-verify_receipt receipt\fR" 4
263.IX Item "-verify_receipt receipt"
264Verify a signed receipt in filename \fBreceipt\fR. The input message \fBmust\fR
265contain the original receipt request. Functionality is otherwise similar
266to the \fB\-verify\fR operation.
267.IP "\fB\-in filename\fR" 4
268.IX Item "-in filename"
269the input message to be encrypted or signed or the message to be decrypted
270or verified.
271.IP "\fB\-inform SMIME|PEM|DER\fR" 4
272.IX Item "-inform SMIME|PEM|DER"
273this specifies the input format for the \s-1CMS\s0 structure. The default
274is \fB\s-1SMIME\s0\fR which reads an S/MIME format message. \fB\s-1PEM\s0\fR and \fB\s-1DER\s0\fR
275format change this to expect \s-1PEM\s0 and \s-1DER\s0 format \s-1CMS\s0 structures
276instead. This currently only affects the input format of the \s-1CMS\s0
277structure, if no \s-1CMS\s0 structure is being input (for example with
278\&\fB\-encrypt\fR or \fB\-sign\fR) this option has no effect.
279.IP "\fB\-rctform SMIME|PEM|DER\fR" 4
280.IX Item "-rctform SMIME|PEM|DER"
281specify the format for a signed receipt for use with the \fB\-receipt_verify\fR
283.IP "\fB\-out filename\fR" 4
284.IX Item "-out filename"
285the message text that has been decrypted or verified or the output \s-1MIME\s0
286format message that has been signed or verified.
287.IP "\fB\-outform SMIME|PEM|DER\fR" 4
288.IX Item "-outform SMIME|PEM|DER"
289this specifies the output format for the \s-1CMS\s0 structure. The default
290is \fB\s-1SMIME\s0\fR which writes an S/MIME format message. \fB\s-1PEM\s0\fR and \fB\s-1DER\s0\fR
291format change this to write \s-1PEM\s0 and \s-1DER\s0 format \s-1CMS\s0 structures
292instead. This currently only affects the output format of the \s-1CMS\s0
293structure, if no \s-1CMS\s0 structure is being output (for example with
294\&\fB\-verify\fR or \fB\-decrypt\fR) this option has no effect.
295.IP "\fB\-stream \-indef \-noindef\fR" 4
296.IX Item "-stream -indef -noindef"
297the \fB\-stream\fR and \fB\-indef\fR options are equivalent and enable streaming I/O
298for encoding operations. This permits single pass processing of data without
299the need to hold the entire contents in memory, potentially supporting very
300large files. Streaming is automatically set for S/MIME signing with detached
301data if the output format is \fB\s-1SMIME\s0\fR it is currently off by default for all
302other operations.
303.IP "\fB\-noindef\fR" 4
304.IX Item "-noindef"
305disable streaming I/O where it would produce and indefinite length constructed
306encoding. This option currently has no effect. In future streaming will be
307enabled by default on all relevant operations and this option will disable it.
308.IP "\fB\-content filename\fR" 4
309.IX Item "-content filename"
310This specifies a file containing the detached content, this is only
311useful with the \fB\-verify\fR command. This is only usable if the \s-1CMS\s0
312structure is using the detached signature form where the content is
313not included. This option will override any content if the input format
314is S/MIME and it uses the multipart/signed \s-1MIME\s0 content type.
315.IP "\fB\-text\fR" 4
316.IX Item "-text"
317this option adds plain text (text/plain) \s-1MIME\s0 headers to the supplied
318message if encrypting or signing. If decrypting or verifying it strips
319off text headers: if the decrypted or verified message is not of \s-1MIME\s0
320type text/plain then an error occurs.
321.IP "\fB\-noout\fR" 4
322.IX Item "-noout"
323for the \fB\-cmsout\fR operation do not output the parsed \s-1CMS\s0 structure. This
324is useful when combined with the \fB\-print\fR option or if the syntax of the \s-1CMS\s0
325structure is being checked.
326.IP "\fB\-print\fR" 4
327.IX Item "-print"
328for the \fB\-cmsout\fR operation print out all fields of the \s-1CMS\s0 structure. This
329is mainly useful for testing purposes.
330.IP "\fB\-CAfile file\fR" 4
331.IX Item "-CAfile file"
332a file containing trusted \s-1CA\s0 certificates, only used with \fB\-verify\fR.
333.IP "\fB\-CApath dir\fR" 4
334.IX Item "-CApath dir"
335a directory containing trusted \s-1CA\s0 certificates, only used with
336\&\fB\-verify\fR. This directory must be a standard certificate directory: that
337is a hash of each subject name (using \fBx509 \-hash\fR) should be linked
338to each certificate.
339.IP "\fB\-md digest\fR" 4
340.IX Item "-md digest"
341digest algorithm to use when signing or resigning. If not present then the
342default digest algorithm for the signing key will be used (usually \s-1SHA1\s0).
343.IP "\fB\-[cipher]\fR" 4
344.IX Item "-[cipher]"
345the encryption algorithm to use. For example triple \s-1DES\s0 (168 bits) \- \fB\-des3\fR
346or 256 bit \s-1AES\s0 \- \fB\-aes256\fR. Any standard algorithm name (as used by the
347\&\fIEVP_get_cipherbyname()\fR function) can also be used preceded by a dash, for
348example \fB\-aes_128_cbc\fR. See \fBenc\fR for a list of ciphers
349supported by your version of OpenSSL.
351If not specified triple \s-1DES\s0 is used. Only used with \fB\-encrypt\fR and
352\&\fB\-EncryptedData_create\fR commands.
353.IP "\fB\-nointern\fR" 4
354.IX Item "-nointern"
355when verifying a message normally certificates (if any) included in
356the message are searched for the signing certificate. With this option
357only the certificates specified in the \fB\-certfile\fR option are used.
358The supplied certificates can still be used as untrusted CAs however.
359.IP "\fB\-no_signer_cert_verify\fR" 4
360.IX Item "-no_signer_cert_verify"
361do not verify the signers certificate of a signed message.
362.IP "\fB\-nocerts\fR" 4
363.IX Item "-nocerts"
364when signing a message the signer's certificate is normally included
365with this option it is excluded. This will reduce the size of the
366signed message but the verifier must have a copy of the signers certificate
367available locally (passed using the \fB\-certfile\fR option for example).
368.IP "\fB\-noattr\fR" 4
369.IX Item "-noattr"
370normally when a message is signed a set of attributes are included which
371include the signing time and supported symmetric algorithms. With this
372option they are not included.
373.IP "\fB\-nosmimecap\fR" 4
374.IX Item "-nosmimecap"
375exclude the list of supported algorithms from signed attributes, other options
376such as signing time and content type are still included.
377.IP "\fB\-binary\fR" 4
378.IX Item "-binary"
379normally the input message is converted to \*(L"canonical\*(R" format which is
380effectively using \s-1CR\s0 and \s-1LF\s0 as end of line: as required by the S/MIME
381specification. When this option is present no translation occurs. This
382is useful when handling binary data which may not be in \s-1MIME\s0 format.
383.IP "\fB\-nodetach\fR" 4
384.IX Item "-nodetach"
385when signing a message use opaque signing: this form is more resistant
386to translation by mail relays but it cannot be read by mail agents that
387do not support S/MIME. Without this option cleartext signing with
388the \s-1MIME\s0 type multipart/signed is used.
389.IP "\fB\-certfile file\fR" 4
390.IX Item "-certfile file"
391allows additional certificates to be specified. When signing these will
392be included with the message. When verifying these will be searched for
393the signers certificates. The certificates should be in \s-1PEM\s0 format.
394.IP "\fB\-certsout file\fR" 4
395.IX Item "-certsout file"
396any certificates contained in the message are written to \fBfile\fR.
397.IP "\fB\-signer file\fR" 4
398.IX Item "-signer file"
399a signing certificate when signing or resigning a message, this option can be
400used multiple times if more than one signer is required. If a message is being
401verified then the signers certificates will be written to this file if the
402verification was successful.
403.IP "\fB\-recip file\fR" 4
404.IX Item "-recip file"
405the recipients certificate when decrypting a message. This certificate
406must match one of the recipients of the message or an error occurs.
407.IP "\fB\-keyid\fR" 4
408.IX Item "-keyid"
409use subject key identifier to identify certificates instead of issuer name and
410serial number. The supplied certificate \fBmust\fR include a subject key
411identifier extension. Supported by \fB\-sign\fR and \fB\-encrypt\fR options.
412.IP "\fB\-receipt_request_all \-receipt_request_first\fR" 4
413.IX Item "-receipt_request_all -receipt_request_first"
414for \fB\-sign\fR option include a signed receipt request. Indicate requests should
415be provided by all receipient or first tier recipients (those mailed directly
416and not from a mailing list). Ignored it \fB\-receipt_request_from\fR is included.
417.IP "\fB\-receipt_request_from emailaddress\fR" 4
418.IX Item "-receipt_request_from emailaddress"
419for \fB\-sign\fR option include a signed receipt request. Add an explicit email
420address where receipts should be supplied.
421.IP "\fB\-receipt_request_to emailaddress\fR" 4
422.IX Item "-receipt_request_to emailaddress"
423Add an explicit email address where signed receipts should be sent to. This
424option \fBmust\fR but supplied if a signed receipt it requested.
425.IP "\fB\-receipt_request_print\fR" 4
426.IX Item "-receipt_request_print"
427For the \fB\-verify\fR operation print out the contents of any signed receipt
429.IP "\fB\-secretkey key\fR" 4
430.IX Item "-secretkey key"
431specify symmetric key to use. The key must be supplied in hex format and be
432consistent with the algorithm used. Supported by the \fB\-EncryptedData_encrypt\fR
433\&\fB\-EncrryptedData_decrypt\fR, \fB\-encrypt\fR and \fB\-decrypt\fR options. When used
434with \fB\-encrypt\fR or \fB\-decrypt\fR the supplied key is used to wrap or unwrap the
435content encryption key using an \s-1AES\s0 key in the \fBKEKRecipientInfo\fR type.
436.IP "\fB\-secretkeyid id\fR" 4
437.IX Item "-secretkeyid id"
438the key identifier for the supplied symmetric key for \fBKEKRecipientInfo\fR type.
439This option \fBmust\fR be present if the \fB\-secretkey\fR option is used with
440\&\fB\-encrypt\fR. With \fB\-decrypt\fR operations the \fBid\fR is used to locate the
441relevant key if it is not supplied then an attempt is used to decrypt any
442\&\fBKEKRecipientInfo\fR structures.
443.IP "\fB\-econtent_type type\fR" 4
444.IX Item "-econtent_type type"
445set the encapsulated content type to \fBtype\fR if not supplied the \fBData\fR type
446is used. The \fBtype\fR argument can be any valid \s-1OID\s0 name in either text or
447numerical format.
448.IP "\fB\-inkey file\fR" 4
449.IX Item "-inkey file"
450the private key to use when signing or decrypting. This must match the
451corresponding certificate. If this option is not specified then the
452private key must be included in the certificate file specified with
453the \fB\-recip\fR or \fB\-signer\fR file. When signing this option can be used
454multiple times to specify successive keys.
455.IP "\fB\-passin arg\fR" 4
456.IX Item "-passin arg"
457the private key password source. For more information about the format of \fBarg\fR
458see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
459.IP "\fB\-rand file(s)\fR" 4
460.IX Item "-rand file(s)"
461a file or files containing random data used to seed the random number
462generator, or an \s-1EGD\s0 socket (see \fIRAND_egd\fR\|(3)).
463Multiple files can be specified separated by a OS-dependent character.
464The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
465all others.
466.IP "\fBcert.pem...\fR" 4
467.IX Item "cert.pem..."
468one or more certificates of message recipients: used when encrypting
469a message.
470.IP "\fB\-to, \-from, \-subject\fR" 4
471.IX Item "-to, -from, -subject"
472the relevant mail headers. These are included outside the signed
473portion of a message so they may be included manually. If signing
474then many S/MIME mail clients check the signers certificate's email
475address matches that specified in the From: address.
476.IP "\fB\-purpose, \-ignore_critical, \-issuer_checks, \-crl_check, \-crl_check_all, \-policy_check, \-extended_crl, \-x509_strict, \-policy \-check_ss_sig\fR" 4
477.IX Item "-purpose, -ignore_critical, -issuer_checks, -crl_check, -crl_check_all, -policy_check, -extended_crl, -x509_strict, -policy -check_ss_sig"
478Set various certificate chain valiadition option. See the
479\&\fBverify\fR manual page for details.
480.SH "NOTES"
481.IX Header "NOTES"
482The \s-1MIME\s0 message must be sent without any blank lines between the
483headers and the output. Some mail programs will automatically add
484a blank line. Piping the mail directly to sendmail is one way to
485achieve the correct format.
487The supplied message to be signed or encrypted must include the
488necessary \s-1MIME\s0 headers or many S/MIME clients wont display it
489properly (if at all). You can use the \fB\-text\fR option to automatically
490add plain text headers.
492A \*(L"signed and encrypted\*(R" message is one where a signed message is
493then encrypted. This can be produced by encrypting an already signed
494message: see the examples section.
496This version of the program only allows one signer per message but it
497will verify multiple signers on received messages. Some S/MIME clients
498choke if a message contains multiple signers. It is possible to sign
499messages \*(L"in parallel\*(R" by signing an already signed message.
501The options \fB\-encrypt\fR and \fB\-decrypt\fR reflect common usage in S/MIME
502clients. Strictly speaking these process \s-1CMS\s0 enveloped data: \s-1CMS\s0
503encrypted data is used for other purposes.
505The \fB\-resign\fR option uses an existing message digest when adding a new
506signer. This means that attributes must be present in at least one existing
507signer using the same message digest or this operation will fail.
509The \fB\-stream\fR and \fB\-indef\fR options enable experimental streaming I/O support.
510As a result the encoding is \s-1BER\s0 using indefinite length constructed encoding
511and no longer \s-1DER\s0. Streaming is supported for the \fB\-encrypt\fR operation and the
512\&\fB\-sign\fR operation if the content is not detached.
514Streaming is always used for the \fB\-sign\fR operation with detached data but
515since the content is no longer part of the \s-1CMS\s0 structure the encoding
516remains \s-1DER\s0.
518If the \fB\-decrypt\fR option is used without a recipient certificate then an
519attempt is made to locate the recipient by trying each potential recipient
520in turn using the supplied private key. To thwart the \s-1MMA\s0 attack
521(Bleichenbacher's attack on \s-1PKCS\s0 #1 v1.5 \s-1RSA\s0 padding) all recipients are
522tried whether they succeed or not and if no recipients match the message
523is \*(L"decrypted\*(R" using a random key which will typically output garbage.
524The \fB\-debug_decrypt\fR option can be used to disable the \s-1MMA\s0 attack protection
525and return an error if no recipient can be found: this option should be used
526with caution. For a fuller description see \fICMS_decrypt\fR\|(3)).
528.IX Header "EXIT CODES"
529.IP "0" 4
530the operation was completely successfully.
531.IP "1" 4
532.IX Item "1"
533an error occurred parsing the command options.
534.IP "2" 4
535.IX Item "2"
536one of the input files could not be read.
537.IP "3" 4
538.IX Item "3"
539an error occurred creating the \s-1CMS\s0 file or when reading the \s-1MIME\s0
541.IP "4" 4
542.IX Item "4"
543an error occurred decrypting or verifying the message.
544.IP "5" 4
545.IX Item "5"
546the message was verified correctly but an error occurred writing out
547the signers certificates.
549.IX Header "COMPATIBILITY WITH PKCS#7 format."
550The \fBsmime\fR utility can only process the older \fBPKCS#7\fR format. The \fBcms\fR
551utility supports Cryptographic Message Syntax format. Use of some features
552will result in messages which cannot be processed by applications which only
553support the older format. These are detailed below.
555The use of the \fB\-keyid\fR option with \fB\-sign\fR or \fB\-encrypt\fR.
557The \fB\-outform \s-1PEM\s0\fR option uses different headers.
559The \fB\-compress\fR option.
561The \fB\-secretkey\fR option when used with \fB\-encrypt\fR.
563Additionally the \fB\-EncryptedData_create\fR and \fB\-data_create\fR type cannot
564be processed by the older \fBsmime\fR command.
566.IX Header "EXAMPLES"
567Create a cleartext signed message:
569.Vb 2
570\& openssl cms \-sign \-in message.txt \-text \-out mail.msg \e
571\& \-signer mycert.pem
574Create an opaque signed message
576.Vb 2
577\& openssl cms \-sign \-in message.txt \-text \-out mail.msg \-nodetach \e
578\& \-signer mycert.pem
581Create a signed message, include some additional certificates and
582read the private key from another file:
584.Vb 2
585\& openssl cms \-sign \-in in.txt \-text \-out mail.msg \e
586\& \-signer mycert.pem \-inkey mykey.pem \-certfile mycerts.pem
589Create a signed message with two signers, use key identifier:
591.Vb 2
592\& openssl cms \-sign \-in message.txt \-text \-out mail.msg \e
593\& \-signer mycert.pem \-signer othercert.pem \-keyid
596Send a signed message under Unix directly to sendmail, including headers:
598.Vb 3
599\& openssl cms \-sign \-in in.txt \-text \-signer mycert.pem \e
600\& \-from \-to someone@somewhere \e
601\& \-subject "Signed message" | sendmail someone@somewhere
604Verify a message and extract the signer's certificate if successful:
606.Vb 1
607\& openssl cms \-verify \-in mail.msg \-signer user.pem \-out signedtext.txt
610Send encrypted mail using triple \s-1DES:\s0
612.Vb 3
613\& openssl cms \-encrypt \-in in.txt \-from \e
614\& \-to someone@somewhere \-subject "Encrypted message" \e
615\& \-des3 user.pem \-out mail.msg
618Sign and encrypt mail:
620.Vb 4
621\& openssl cms \-sign \-in ml.txt \-signer my.pem \-text \e
622\& | openssl cms \-encrypt \-out mail.msg \e
623\& \-from \-to someone@somewhere \e
624\& \-subject "Signed and Encrypted message" \-des3 user.pem
627Note: the encryption command does not include the \fB\-text\fR option because the
628message being encrypted already has \s-1MIME\s0 headers.
630Decrypt mail:
632.Vb 1
633\& openssl cms \-decrypt \-in mail.msg \-recip mycert.pem \-inkey key.pem
636The output from Netscape form signing is a PKCS#7 structure with the
637detached signature format. You can use this program to verify the
638signature by line wrapping the base64 encoded structure and surrounding
639it with:
641.Vb 2
642\& \-\-\-\-\-BEGIN PKCS7\-\-\-\-\-
643\& \-\-\-\-\-END PKCS7\-\-\-\-\-
646and using the command,
648.Vb 1
649\& openssl cms \-verify \-inform PEM \-in signature.pem \-content content.txt
652alternatively you can base64 decode the signature and use
654.Vb 1
655\& openssl cms \-verify \-inform DER \-in signature.der \-content content.txt
658Create an encrypted message using 128 bit Camellia:
660.Vb 1
661\& openssl cms \-encrypt \-in plain.txt \-camellia128 \-out mail.msg cert.pem
664Add a signer to an existing message:
666.Vb 1
667\& openssl cms \-resign \-in mail.msg \-signer newsign.pem \-out mail2.msg
669.SH "BUGS"
670.IX Header "BUGS"
671The \s-1MIME\s0 parser isn't very clever: it seems to handle most messages that I've
672thrown at it but it may choke on others.
674The code currently will only write out the signer's certificate to a file: if
675the signer has a separate encryption certificate this must be manually
676extracted. There should be some heuristic that determines the correct
677encryption certificate.
679Ideally a database should be maintained of a certificates for each email
682The code doesn't currently take note of the permitted symmetric encryption
683algorithms as supplied in the SMIMECapabilities signed attribute. this means the
684user has to manually include the correct encryption algorithm. It should store
685the list of permitted ciphers in a database and only use those.
687No revocation checking is done on the signer's certificate.
689.IX Header "HISTORY"
690The use of multiple \fB\-signer\fR options and the \fB\-resign\fR command were first
691added in OpenSSL 1.0.0