Update build for OpenSSL-0.9.8j upgrade.
[dragonfly.git] / secure / lib / libcrypto / man / PKCS7_decrypt.3
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132.\" ========================================================================
133.\"
134.IX Title "PKCS7_decrypt 3"
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135.TH PKCS7_decrypt 3 "2009-01-11" "0.9.8j" "OpenSSL"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
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140.SH "NAME"
141PKCS7_decrypt \- decrypt content from a PKCS#7 envelopedData structure
142.SH "SYNOPSIS"
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143.IX Header "SYNOPSIS"
144int PKCS7_decrypt(\s-1PKCS7\s0 *p7, \s-1EVP_PKEY\s0 *pkey, X509 *cert, \s-1BIO\s0 *data, int flags);
984263bc 145.SH "DESCRIPTION"
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146.IX Header "DESCRIPTION"
147\&\fIPKCS7_decrypt()\fR extracts and decrypts the content from a PKCS#7 envelopedData
984263bc 148structure. \fBpkey\fR is the private key of the recipient, \fBcert\fR is the
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149recipients certificate, \fBdata\fR is a \s-1BIO\s0 to write the content to and
150\&\fBflags\fR is an optional set of flags.
984263bc 151.SH "NOTES"
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152.IX Header "NOTES"
153\&\fIOpenSSL_add_all_algorithms()\fR (or equivalent) should be called before using this
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154function or errors about unknown algorithms will occur.
155.PP
156Although the recipients certificate is not needed to decrypt the data it is needed
157to locate the appropriate (of possible several) recipients in the PKCS#7 structure.
158.PP
159The following flags can be passed in the \fBflags\fR parameter.
160.PP
8b0cefbb 161If the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
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162from the content. If the content is not of type \fBtext/plain\fR then an error is
163returned.
164.SH "RETURN VALUES"
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165.IX Header "RETURN VALUES"
166\&\fIPKCS7_decrypt()\fR returns either 1 for success or 0 for failure.
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167The error can be obtained from \fIERR_get_error\fR\|(3)
168.SH "BUGS"
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169.IX Header "BUGS"
170\&\fIPKCS7_decrypt()\fR must be passed the correct recipient key and certificate. It would
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171be better if it could look up the correct key and certificate from a database.
172.PP
173The lack of single pass processing and need to hold all data in memory as
174mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR.
175.SH "SEE ALSO"
74dab6c2 176.IX Header "SEE ALSO"
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177\&\fIERR_get_error\fR\|(3), \fIPKCS7_encrypt\fR\|(3)
178.SH "HISTORY"
984263bc 179.IX Header "HISTORY"
8b0cefbb 180\&\fIPKCS7_decrypt()\fR was added to OpenSSL 0.9.5