PKCS7_encrypt(3)            OpenSSL            PKCS7_encrypt(3)





NAME
       PKCS7_encrypt - create a PKCS#7 envelopedData structure

SYNOPSIS
       PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in,
       const EVP_CIPHER *cipher, int flags);

DESCRIPTION
       PKCS7_encrypt() creates and returns a PKCS#7 enveloped-
       Data structure. certs is a list of recipient certifi-
       cates. in is the content to be encrypted.  cipher is the
       symmetric cipher to use. flags is an optional set of
       flags.

NOTES
       Only RSA keys are supported in PKCS#7 and envelopedData
       so the recipient certificates supplied to this function
       must all contain RSA public keys, though they do not
       have to be signed using the RSA algorithm.

       EVP_des_ede3_cbc() (triple DES) is the algorithm of
       choice for S/MIME use because most clients will support
       it.

       Some old "export grade" clients may only support weak
       encryption using 40 or 64 bit RC2. These can be used by
       passing EVP_rc2_40_cbc() and EVP_rc2_64_cbc() respec-
       tively.

       The algorithm passed in the cipher parameter must sup-
       port ASN1 encoding of its parameters.

       Many browsers implement a "sign and encrypt" option
       which is simply an S/MIME envelopedData containing an
       S/MIME signed message. This can be readily produced by
       storing the S/MIME signed message in a memory BIO and
       passing it to PKCS7_encrypt().

       The following flags can be passed in the flags parame-
       ter.

       If the PKCS7_TEXT flag is set MIME headers for type
       text/plain are prepended to the data.

       Normally the supplied content is translated into MIME
       canonical format (as required by the S/MIME specifica-
       tions) if PKCS7_BINARY is set no translation occurs.
       This option should be used if the supplied data is in
       binary format otherwise the translation will corrupt it.
       If PKCS7_BINARY is set then PKCS7_TEXT is ignored.

RETURN VALUES
       PKCS7_encrypt() returns either a valid PKCS7 structure
       or NULL if an error occurred.  The error can be obtained
       from ERR_get_error(3).

BUGS
       The lack of single pass processing and need to hold all
       data in memory as mentioned in PKCS7_sign() also applies
       to PKCS7_verify().

SEE ALSO
       ERR_get_error(3), PKCS7_decrypt(3)

HISTORY
       PKCS7_decrypt() was added to OpenSSL 0.9.5



0.9.7c                     2002-10-09          PKCS7_encrypt(3)
