1=pod
2
3=head1 NAME
4
5PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure
6
7=head1 SYNOPSIS
8
9 #include <openssl/pkcs7.h>
10
11 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
12
13=head1 DESCRIPTION
14
15PKCS7_decrypt() extracts and decrypts the content from a PKCS#7 envelopedData
16structure. B<pkey> is the private key of the recipient, B<cert> is the
17recipients certificate, B<data> is a BIO to write the content to and
18B<flags> is an optional set of flags.
19
20=head1 NOTES
21
22OpenSSL_add_all_algorithms() (or equivalent) should be called before using this
23function or errors about unknown algorithms will occur.
24
25Although the recipients certificate is not needed to decrypt the data it is needed
26to locate the appropriate (of possible several) recipients in the PKCS#7 structure.
27
28The following flags can be passed in the B<flags> parameter.
29
30If the B<PKCS7_TEXT> flag is set MIME headers for type B<text/plain> are deleted
31from the content. If the content is not of type B<text/plain> then an error is
32returned.
33
34=head1 RETURN VALUES
35
36PKCS7_decrypt() returns either 1 for success or 0 for failure.
37The error can be obtained from ERR_get_error(3)
38
39=head1 BUGS
40
41PKCS7_decrypt() must be passed the correct recipient key and certificate. It would
42be better if it could look up the correct key and certificate from a database.
43
44The lack of single pass processing and need to hold all data in memory as
45mentioned in PKCS7_sign() also applies to PKCS7_verify().
46
47=head1 SEE ALSO
48
49L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_encrypt(3)|PKCS7_encrypt(3)>
50
51=head1 HISTORY
52
53PKCS7_decrypt() was added to OpenSSL 0.9.5
54
55=cut
56