openssl_seal(3) [php man page]

OPENSSL_SEAL(3) 							 1							   OPENSSL_SEAL(3)

openssl_seal - Seal (encrypt) data

SYNOPSIS

       int openssl_seal (string  $data, string	&$sealed_data, array  &$env_keys, array  $pub_key_ids, [string	$method])

DESCRIPTION

       openssl_seal(3) seals (encrypts) $data by using RC4 with a randomly generated secret key. The key is encrypted with each of the public keys
       associated with the identifiers in $pub_key_ids and each encrypted key is returned in $env_keys. This means that one can send  sealed  data
       to multiple recipients (provided one has obtained their public keys). Each recipient must receive both the sealed data and the envelope key
       that was encrypted with the recipient's public key.

PARAMETERS

	      o $data
		-

	      o $sealed_data
		-

	      o $env_keys
		-

	      o $pub_key_ids
		-

RETURN VALUES

	Returns the length of the sealed data on success, or FALSE on error. If successful the sealed data is returned in  $sealed_data,  and  the
       envelope keys in $env_keys.

EXAMPLES

       Example #1

	      openssl_seal(3) example

	      <?php
	      // $data is assumed to contain the data to be sealed

	      // fetch public keys for our recipients, and ready them
	      $fp = fopen("/src/openssl-0.9.6/demos/maurice/cert.pem", "r");
	      $cert = fread($fp, 8192);
	      fclose($fp);
	      $pk1 = openssl_get_publickey($cert);
	      // Repeat for second recipient
	      $fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
	      $cert = fread($fp, 8192);
	      fclose($fp);
	      $pk2 = openssl_get_publickey($cert);

	      // seal message, only owners of $pk1 and $pk2 can decrypt $sealed with keys
	      // $ekeys[0] and $ekeys[1] respectively.
	      openssl_seal($data, $sealed, $ekeys, array($pk1, $pk2));

	      // free the keys from memory
	      openssl_free_key($pk1);
	      openssl_free_key($pk2);
	      ?>

SEE ALSO

       openssl_open(3).

PHP Documentation Group 													   OPENSSL_SEAL(3)

CMS_decrypt(3SSL)						      OpenSSL							 CMS_decrypt(3SSL)

NAME

	CMS_decrypt - decrypt content from a CMS envelopedData structure

SYNOPSIS

	#include <openssl/cms.h>

	int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *dcont, BIO *out, unsigned int flags);

DESCRIPTION

       CMS_decrypt() extracts and decrypts the content from a CMS EnvelopedData structure. pkey is the private key of the recipient, cert is the
       recipient's certificate, out is a BIO to write the content to and flags is an optional set of flags.

       The dcont parameter is used in the rare case where the encrypted content is detached. It will normally be set to NULL.

NOTES

       OpenSSL_add_all_algorithms() (or equivalent) should be called before using this function or errors about unknown algorithms will occur.

       Although the recipients certificate is not needed to decrypt the data it is needed to locate the appropriate (of possible several)
       recipients in the CMS structure. If cert is set to NULL all possible recipients are tried.

       It is possible to determine the correct recipient key by other means (for example looking them up in a database) and setting them in the
       CMS structure in advance using the CMS utility functions such as CMS_set1_pkey(). In this case both cert and pkey should be set to NULL.

       To process KEKRecipientInfo types CMS_set1_key() or CMS_RecipientInfo_set0_key() and CMS_ReceipientInfo_decrypt() should be called before
       CMS_decrypt() and cert and pkey set to NULL.

       The following flags can be passed in the flags parameter.

       If the CMS_TEXT flag is set MIME headers for type text/plain are deleted from the content. If the content is not of type text/plain then an
       error is returned.

RETURN VALUES

       CMS_decrypt() returns either 1 for success or 0 for failure.  The error can be obtained from ERR_get_error(3)

BUGS

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

SEE ALSO

       ERR_get_error(3), CMS_encrypt(3)

HISTORY

       CMS_decrypt() was added to OpenSSL 0.9.8

1.0.0e								    2008-04-11							 CMS_decrypt(3SSL)