Manual Pages for UNIX Operating System command usage for man PKCS7_encrypt

OpenSSL                                   PKCS7_encrypt(3openssl)



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     PKCS7_encrypt - create a PKCS#7 envelopedData structure

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      #include 

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


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

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     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 cccciiiipppphhhheeeerrrr 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 ffffllllaaaaggggssss parameter.

     If the PPPPKKKKCCCCSSSS7777_TTTTEEEEXXXXTTTT flag is set MIME headers for type
     tttteeeexxxxtttt////ppppllllaaaaiiiinnnn are prepended to the data.

     Normally the supplied content is translated into MIME
     canonical format (as required by the S/MIME specifications)
     if PPPPKKKKCCCCSSSS7777_BBBBIIIINNNNAAAARRRRYYYY 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 PPPPKKKKCCCCSSSS7777_BBBBIIIINNNNAAAARRRRYYYY
     is set then PPPPKKKKCCCCSSSS7777_TTTTEEEEXXXXTTTT is ignored.

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



27/Mar/2010            Last change: 0.9.8o                      1






OpenSSL                                   PKCS7_encrypt(3openssl)



     ERR_get_error(3).

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

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     ERR_get_error(3), PKCS7_decrypt(3)

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     PKCS7_decrypt() was added to OpenSSL 0.9.5











































27/Mar/2010            Last change: 0.9.8o                      2