SMIME_read_PKCS7(3)

SMIME_read_PKCS7(3)          OpenSSL          SMIME_read_PKCS7(3)

NAME

     SMIME_read_PKCS7 - parse S/MIME message.

SYNOPSIS

      #include <openssl/pkcs7.h>

      PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);

DESCRIPTION

     SMIME_read_PKCS7() parses a message in S/MIME format.

     in is a BIO to read the message from.

     If cleartext signing is used then the content is saved in a
     memory bio which is written to *bcont, otherwise *bcont is
     set to NULL.

     The parsed PKCS#7 structure is returned or NULL if an error
     occurred.

NOTES

     If *bcont is not NULL then the message is clear text signed.
     *bcont can then be passed to PKCS7_verify() with the
     PKCS7_DETACHED flag set.

     Otherwise the type of the returned structure can be
     determined using PKCS7_type().

     To support future functionality if bcont is not NULL *bcont
     should be initialized to NULL. For example:

      BIO *cont = NULL;
      PKCS7 *p7;

      p7 = SMIME_read_PKCS7(in, &cont);

BUGS

     The MIME parser used by SMIME_read_PKCS7() is somewhat
     primitive.  While it will handle most S/MIME messages more
     complex compound formats may not work.

     The parser assumes that the PKCS7 structure is always base64
     encoded and will not handle the case where it is in binary
     format or uses quoted printable format.

     The use of a memory BIO to hold the signed content limits
     the size of message which can be processed due to memory
     restraints: a streaming single pass option should be
     available.

RETURN VALUES

     SMIME_read_PKCS7() returns a valid PKCS7 structure or NULL

1.0.2t               Last change: 2019-09-10                    1

SMIME_read_PKCS7(3)          OpenSSL          SMIME_read_PKCS7(3)

     if an error occurred. The error can be obtained from
     ERR_get_error(3).

SEE ALSO

     ERR_get_error(3), PKCS7_type(3) SMIME_read_PKCS7(3),
     PKCS7_sign(3), PKCS7_verify(3), PKCS7_encrypt(3)
     PKCS7_decrypt(3)

HISTORY

     SMIME_read_PKCS7() was added to OpenSSL 0.9.5

1.0.2t               Last change: 2019-09-10                    2