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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 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.

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() 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 PKCS7_encrypt().

       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 canonical 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 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



0.9.7l                                           2002-10-09                                 PKCS7_encrypt(3)