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135 .\" ========================================================================
137 .IX Title "PKCS7_decrypt 3"
138 .TH PKCS7_decrypt 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 PKCS7_decrypt \- decrypt content from a PKCS#7 envelopedData structure
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/pkcs7.h>
152 \& int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
155 .IX Header "DESCRIPTION"
156 \&\fIPKCS7_decrypt()\fR extracts and decrypts the content from a PKCS#7 envelopedData
157 structure. \fBpkey\fR is the private key of the recipient, \fBcert\fR is the
158 recipients certificate, \fBdata\fR is a \s-1BIO\s0 to write the content to and
159 \&\fBflags\fR is an optional set of flags.
162 \&\fIOpenSSL_add_all_algorithms()\fR (or equivalent) should be called before using this
163 function or errors about unknown algorithms will occur.
165 Although the recipients certificate is not needed to decrypt the data it is needed
166 to locate the appropriate (of possible several) recipients in the PKCS#7 structure.
168 The following flags can be passed in the \fBflags\fR parameter.
170 If the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
171 from the content. If the content is not of type \fBtext/plain\fR then an error is
174 .IX Header "RETURN VALUES"
175 \&\fIPKCS7_decrypt()\fR returns either 1 for success or 0 for failure.
176 The error can be obtained from \fIERR_get_error\fR\|(3)
179 \&\fIPKCS7_decrypt()\fR must be passed the correct recipient key and certificate. It would
180 be better if it could look up the correct key and certificate from a database.
182 The lack of single pass processing and need to hold all data in memory as
183 mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR.
185 .IX Header "SEE ALSO"
186 \&\fIERR_get_error\fR\|(3), \fIPKCS7_encrypt\fR\|(3)
189 \&\fIPKCS7_decrypt()\fR was added to OpenSSL 0.9.5