• Predefined Constants
  • PKCS7 Flags/Constants

  • PKCS7 Flags/Constants
  • PKCS7 Flags/Constants

    PKCS7 Flags/Constants

    The S/MIME functions make use of flags which are
    specified using a bitfield which can include one or more of the
    following values:

    Constant Description
    PKCS7_TEXT Adds text/plain content type headers to encrypted/signed
    message. If decrypting or verifying, it strips those headers from
    the output – if the decrypted or verified message is not of MIME
    type text/plain then an error will occur.
    PKCS7_BINARY 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.
    PKCS7_NOINTERN When verifying a message, certificates (if any) included in the
    message are normally searched for the signing certificate. With
    this option only the certificates specified in the extracerts parameter of openssl_pkcs7_verify() are used. The supplied
    certificates can still be used as untrusted CAs however.
    PKCS7_NOVERIFY Do not verify the signers certificate of a signed message.
    PKCS7_NOCHAIN Do not chain verification of signers certificates: that is
    don’t use the certificates in the signed message as untrusted
    PKCS7_NOCERTS 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
    extracerts to openssl_pkcs7_verify() for example).
    PKCS7_NOATTR Normally when a message is signed, a set of attributes are
    included which include the signing time and the supported symmetric
    algorithms. With this option they are not included.
    PKCS7_DETACHED When signing a message, use cleartext signing with the MIME
    type “multipart/signed”. This is the default if you do not
    specify any flags to openssl_pkcs7_sign(). If you turn this option
    off, the message will be signed using opaque signing, which is more
    resistant to translation by mail relays but cannot be read by mail
    agents that do not support S/MIME.
    PKCS7_NOSIGS Don’t try and verify the signatures on a message