MirBSD manpage: PKCS7_encrypt(3)

PKCS7_ENCRYPT(3)             OpenSSL             PKCS7_ENCRYPT(3)


     PKCS7_encrypt - create a PKCS#7 envelopedData structure


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


     PKCS7_encrypt() creates and returns a PKCS#7 envelopedData
     structure. certs is a list of recipient certificates. in is
     the content to be encrypted. cipher is the symmetric cipher
     to use. flags is an optional set of flags.


     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() respectively.

     The algorithm passed in the cipher parameter must support
     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

     The following flags can be passed in the flags parameter.

     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 canon-
     ical format (as required by the S/MIME specifications) if
     PKCS7_BINARY is set no translation occurs. This option
     should be used if the supplied data is in binary format oth-
     erwise the translation will corrupt it. If PKCS7_BINARY is
     set then PKCS7_TEXT is ignored.


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

MirBSD #10-current         2005-02-05                           1

PKCS7_ENCRYPT(3)             OpenSSL             PKCS7_ENCRYPT(3)


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


     ERR_get_error(3), PKCS7_decrypt(3)


     PKCS7_decrypt() was added to OpenSSL 0.9.5

MirBSD #10-current         2005-02-05                           2

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