Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / CMS_decrypt.3
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124.\" ========================================================================
125.\"
126.IX Title "CMS_decrypt 3"
e3261593 127.TH CMS_decrypt 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133.Vb 1
134\& CMS_decrypt \- decrypt content from a CMS envelopedData structure
135.Ve
136.SH "SYNOPSIS"
137.IX Header "SYNOPSIS"
138.Vb 1
139\& #include <openssl/cms.h>
140\&
141\& int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *dcont, BIO *out, unsigned int flags);
142.Ve
143.SH "DESCRIPTION"
144.IX Header "DESCRIPTION"
145\&\fICMS_decrypt()\fR extracts and decrypts the content from a \s-1CMS\s0 EnvelopedData
146structure. \fBpkey\fR is the private key of the recipient, \fBcert\fR is the
147recipient's certificate, \fBout\fR is a \s-1BIO\s0 to write the content to and
148\&\fBflags\fR is an optional set of flags.
149.PP
150The \fBdcont\fR parameter is used in the rare case where the encrypted content
151is detached. It will normally be set to \s-1NULL\s0.
152.SH "NOTES"
153.IX Header "NOTES"
154\&\fIOpenSSL_add_all_algorithms()\fR (or equivalent) should be called before using this
155function or errors about unknown algorithms will occur.
156.PP
157Although the recipients certificate is not needed to decrypt the data it is
158needed to locate the appropriate (of possible several) recipients in the \s-1CMS\s0
159structure. If \fBcert\fR is set to \s-1NULL\s0 all possible recipients are tried.
160.PP
161It is possible to determine the correct recipient key by other means (for
162example looking them up in a database) and setting them in the \s-1CMS\s0 structure
163in advance using the \s-1CMS\s0 utility functions such as \fICMS_set1_pkey()\fR. In this
164case both \fBcert\fR and \fBpkey\fR should be set to \s-1NULL\s0.
165.PP
166To process KEKRecipientInfo types \fICMS_set1_key()\fR or \fICMS_RecipientInfo_set0_key()\fR
167and \fICMS_ReceipientInfo_decrypt()\fR should be called before \fICMS_decrypt()\fR and
168\&\fBcert\fR and \fBpkey\fR set to \s-1NULL\s0.
169.PP
170The following flags can be passed in the \fBflags\fR parameter.
171.PP
172If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
173from the content. If the content is not of type \fBtext/plain\fR then an error is
174returned.
175.SH "RETURN VALUES"
176.IX Header "RETURN VALUES"
177\&\fICMS_decrypt()\fR returns either 1 for success or 0 for failure.
178The error can be obtained from \fIERR_get_error\fR\|(3)
179.SH "BUGS"
180.IX Header "BUGS"
181The lack of single pass processing and the need to hold all data in memory as
182mentioned in \fICMS_verify()\fR also applies to \fICMS_decrypt()\fR.
183.SH "SEE ALSO"
184.IX Header "SEE ALSO"
185\&\fIERR_get_error\fR\|(3), \fICMS_encrypt\fR\|(3)
186.SH "HISTORY"
187.IX Header "HISTORY"
188\&\fICMS_decrypt()\fR was added to OpenSSL 0.9.8