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           openssl smime [-encrypt] [-decrypt] [-sign] [-resign] [-verify]
           [-pk7out] [-[cipher]] [-in file] [-CAfile file] [-CApath dir]
           [-trusted_first] [-certfile file] [-signer file] [-recip  file]
           [-inform SMIME|PEM|DER] [-passin arg] [-inkey file] [-out file]
           [-outform SMIME|PEM|DER] [-content file] [-to addr] [-from ad]
           [-subject s] [-text] [-indef] [-noindef] [-stream] [-rand file(s)] [-md
           digest] [cert.pem]...


           The smime command handles S/MIME mail. It can encrypt, decrypt, sign
           and verify S/MIME messages.


           There are six operation options that set the type of operation to be
           performed.  The meaning of the other options varies according to the
           operation type.
               encrypt mail for the given recipient certificates. Input file is
               the message to be encrypted. The output file is the encrypted mail
               in MIME format.
               decrypt mail using the supplied certificate and private key.
               Expects an encrypted mail message in MIME format for the input
               file. The decrypted mail is written to the output file.
               sign mail using the supplied certificate and private key. Input
               file is the message to be signed. The signed message in MIME format
               is written to the output file.
               verify signed mail. Expects a signed mail message on input and
               outputs the signed data. Both clear text and opaque signing is
               takes an input message and writes out a PEM encoded PKCS#7
               resign a message: take an existing message and one or more new
           -in filename
               the input message to be encrypted or signed or the MIME message to
               be decrypted or verified.
           -inform SMIME|PEM|DER
               this specifies the input format for the PKCS#7 structure. The
               instead. This currently only affects the output format of the
               PKCS#7 structure, if no PKCS#7 structure is being output (for
               example with -verify or -decrypt) this option has no effect.
           -stream -indef -noindef
               the -stream and -indef options are equivalent and enable streaming
               I/O for encoding operations. This permits single pass processing of
               data without the need to hold the entire contents in memory,
               potentially supporting very large files. Streaming is automatically
               set for S/MIME signing with detached data if the output format is
               SMIME it is currently off by default for all other operations.
               disable streaming I/O where it would produce and indefinite length
               constructed encoding. This option currently has no effect. In
               future streaming will be enabled by default on all relevant
               operations and this option will disable it.
           -content filename
               This specifies a file containing the detached content, this is only
               useful with the -verify command. This is only usable if the PKCS#7
               structure is using the detached signature form where the content is
               not included. This option will override any content if the input
               format is S/MIME and it uses the multipart/signed MIME content
               this option adds plain text (text/plain) MIME headers to the
               supplied message if encrypting or signing. If decrypting or
               verifying it strips off text headers: if the decrypted or verified
               message is not of MIME type text/plain then an error occurs.
           -CAfile file
               a file containing trusted CA certificates, only used with -verify.
           -CApath dir
               a directory containing trusted CA certificates, only used with
               -verify. This directory must be a standard certificate directory:
               that is a hash of each subject name (using x509 -hash) should be
               linked to each certificate.
               Use certificates in CA file or CA directory over certificates
               provided in the message when building the trust chain to verify a
               certificate.  This is mainly useful in environments with Bridge CA
               or Cross-Certified CAs.
           -md digest
               digest algorithm to use when signing or resigning. If not present
               then the default digest algorithm for the signing key will be used
               (usually SHA1).
               do not verify the signers certificate of a signed message.
               do not do chain verification of signers certificates: that is don't
               use the certificates in the signed message as untrusted CAs.
               don't try to verify the signatures on the message.
               when signing a message the signer's certificate is normally
               included with this option it is excluded. This will reduce the size
               of the signed message but the verifier must have a copy of the
               signers certificate available locally (passed using the -certfile
               option for example).
               normally when a message is signed a set of attributes are included
               which include the signing time and supported symmetric algorithms.
               With this option they are not included.
               normally the input message is converted to "canonical" format which
               is effectively using CR and LF as end of line: as required by the
               S/MIME specification. When this option is present no translation
               occurs. This is useful when handling binary data which may not be
               in MIME format.
               when signing a message use opaque signing: this form is more
               resistant to translation by mail relays but it cannot be read by
               mail agents that do not support S/MIME.  Without this option
               cleartext signing with the MIME type multipart/signed is used.
           -certfile file
               allows additional certificates to be specified. When signing these
               will be included with the message. When verifying these will be
               searched for the signers certificates. The certificates should be
               in PEM format.
           -signer file
               a signing certificate when signing or resigning a message, this
               option can be used multiple times if more than one signer is
               required. If a message is being verified then the signers
               certificates will be written to this file if the verification was
           -recip file
               the recipients certificate when decrypting a message. This
               certificate must match one of the recipients of the message or an
               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.
               one or more certificates of message recipients: used when
               encrypting a message.
           -to, -from, -subject
               the relevant mail headers. These are included outside the signed
               portion of a message so they may be included manually. If signing
               then many S/MIME mail clients check the signers certificate's email
               address matches that specified in the From: address.
           -purpose, -ignore_critical, -issuer_checks, -crl_check, -crl_check_all,
           -policy_check, -extended_crl, -x509_strict, -policy -check_ss_sig
               Set various options of certificate chain verification. See verify
               manual page for details.


           The MIME message must be sent without any blank lines between the
           headers and the output. Some mail programs will automatically add a
           blank line. Piping the mail directly to sendmail is one way to achieve
           the correct format.
           The supplied message to be signed or encrypted must include the
           necessary MIME headers or many S/MIME clients wont display it properly
           (if at all). You can use the -text option to automatically add plain
           text headers.
           A "signed and encrypted" message is one where a signed message is then
           encrypted. This can be produced by encrypting an already signed
           message: see the examples section.
           This version of the program only allows one signer per message but it
           will verify multiple signers on received messages. Some S/MIME clients
           choke if a message contains multiple signers. It is possible to sign
           messages "in parallel" by signing an already signed message.
           The options -encrypt and -decrypt reflect common usage in S/MIME
           clients. Strictly speaking these process PKCS#7 enveloped data: PKCS#7
           encrypted data is used for other purposes.
           The -resign option uses an existing message digest when adding a new
           signer. This means that attributes must be present in at least one
           existing signer using the same message digest or this operation will
           The -stream and -indef options enable experimental streaming I/O
           support.  As a result the encoding is BER using indefinite length
           constructed encoding and no longer DER. Streaming is supported for the
           3   an error occurred creating the PKCS#7 file or when reading the MIME
           4   an error occurred decrypting or verifying the message.
           5   the message was verified correctly but an error occurred writing
               out the signers certificates.


           Create a cleartext signed message:
            openssl smime -sign -in message.txt -text -out mail.msg \
                   -signer mycert.pem
           Create an opaque signed message:
            openssl smime -sign -in message.txt -text -out mail.msg -nodetach \
                   -signer mycert.pem
           Create a signed message, include some additional certificates and read
           the private key from another file:
            openssl smime -sign -in in.txt -text -out mail.msg \
                   -signer mycert.pem -inkey mykey.pem -certfile mycerts.pem
           Create a signed message with two signers:
            openssl smime -sign -in message.txt -text -out mail.msg \
                   -signer mycert.pem -signer othercert.pem
           Send a signed message under Unix directly to sendmail, including
            openssl smime -sign -in in.txt -text -signer mycert.pem \
                   -from -to someone@somewhere \
                   -subject "Signed message" | sendmail someone@somewhere
           Verify a message and extract the signer's certificate if successful:
            openssl smime -verify -in mail.msg -signer user.pem -out signedtext.txt
           Send encrypted mail using triple DES:
            openssl smime -encrypt -in in.txt -from \
                   -to someone@somewhere -subject "Encrypted message" \
                   -des3 user.pem -out mail.msg
           Sign and encrypt mail:
            openssl smime -sign -in ml.txt -signer my.pem -text \
                   | openssl smime -encrypt -out mail.msg \
                   -from -to someone@somewhere \
            -----BEGIN PKCS7-----
            -----END PKCS7-----
           and using the command:
            openssl smime -verify -inform PEM -in signature.pem -content content.txt
           Alternatively you can base64 decode the signature and use:
            openssl smime -verify -inform DER -in signature.der -content content.txt
           Create an encrypted message using 128 bit Camellia:
            openssl smime -encrypt -in plain.txt -camellia128 -out mail.msg cert.pem
           Add a signer to an existing message:
            openssl smime -resign -in mail.msg -signer newsign.pem -out mail2.msg


           The MIME parser isn't very clever: it seems to handle most messages
           that I've thrown at it but it may choke on others.
           The code currently will only write out the signer's certificate to a
           file: if the signer has a separate encryption certificate this must be
           manually extracted. There should be some heuristic that determines the
           correct encryption certificate.
           Ideally a database should be maintained of a certificates for each
           email address.
           The code doesn't currently take note of the permitted symmetric
           encryption algorithms as supplied in the SMIMECapabilities signed
           attribute. This means the user has to manually include the correct
           encryption algorithm. It should store the list of permitted ciphers in
           a database and only use those.
           No revocation checking is done on the signer's certificate.
           The current code can only handle S/MIME v2 messages, the more complex
           S/MIME v3 structures may cause parsing errors.


           The use of multiple -signer options and the -resign command were first
           added in OpenSSL 1.0.0

    1.0.1e 2017-03-22 SMIME(1)


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