2002-10-09 20:06:12 +08:00
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=pod
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=head1 NAME
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PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure
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=head1 SYNOPSIS
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2006-05-14 19:28:00 +08:00
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#include <openssl/pkcs7.h>
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int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
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2002-10-09 20:06:12 +08:00
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=head1 DESCRIPTION
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PKCS7_decrypt() extracts and decrypts the content from a PKCS#7 envelopedData
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structure. B<pkey> is the private key of the recipient, B<cert> is the
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recipients certificate, B<data> is a BIO to write the content to and
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B<flags> is an optional set of flags.
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=head1 NOTES
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OpenSSL_add_all_algorithms() (or equivalent) should be called before using this
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function or errors about unknown algorithms will occur.
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Although the recipients certificate is not needed to decrypt the data it is needed
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to locate the appropriate (of possible several) recipients in the PKCS#7 structure.
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The following flags can be passed in the B<flags> parameter.
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If the B<PKCS7_TEXT> flag is set MIME headers for type B<text/plain> are deleted
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from the content. If the content is not of type B<text/plain> then an error is
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returned.
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=head1 RETURN VALUES
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PKCS7_decrypt() returns either 1 for success or 0 for failure.
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The error can be obtained from ERR_get_error(3)
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=head1 BUGS
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PKCS7_decrypt() must be passed the correct recipient key and certificate. It would
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be better if it could look up the correct key and certificate from a database.
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The lack of single pass processing and need to hold all data in memory as
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mentioned in PKCS7_sign() also applies to PKCS7_verify().
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=head1 SEE ALSO
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L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_encrypt(3)|PKCS7_encrypt(3)>
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=head1 HISTORY
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PKCS7_decrypt() was added to OpenSSL 0.9.5
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=cut
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