Switch from OpenSSL 0.9.7d to 0.9.7e.
[dragonfly.git] / secure / lib / libcrypto / man / PKCS7_encrypt.3
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2''' $RCSfile$$Revision$$Date$
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34'''
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36''' Set up \*(-- to give an unbreakable dash;
37''' string Tr holds user defined translation string.
38''' Bell System Logo is used as a dummy character.
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984263bc 40.tr \(*W-|\(bv\*(Tr
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42.ds -- \(*W-
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46.ds L" ""
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48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
51''' double-quote interpretation
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64.ds -- \(em\|
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
84.\" Sh Subsection
85.\" Ip Item
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96.TH PKCS7_encrypt 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
984263bc 99.if n .na
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109..
110.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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120.\}
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139.\}
140.if t \{\
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141. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
142. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
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144. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
145. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
146. ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
147. ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
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172\{\
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188.\}
189.rm #[ #] #H #V #F C
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190.SH "NAME"
191PKCS7_encrypt \- create a PKCS#7 envelopedData structure
192.SH "SYNOPSIS"
74dab6c2 193PKCS7 *\fIPKCS7_encrypt\fR\|(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, int flags);
984263bc 194.SH "DESCRIPTION"
74dab6c2 195\fIPKCS7_encrypt()\fR creates and returns a PKCS#7 envelopedData structure. \fBcerts\fR
984263bc 196is a list of recipient certificates. \fBin\fR is the content to be encrypted.
74dab6c2 197\fBcipher\fR is the symmetric cipher to use. \fBflags\fR is an optional set of flags.
984263bc 198.SH "NOTES"
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199Only RSA keys are supported in PKCS#7 and envelopedData so the recipient certificates
200supplied to this function must all contain RSA public keys, though they do not have to
201be signed using the RSA algorithm.
984263bc 202.PP
74dab6c2 203\fIEVP_des_ede3_cbc()\fR (triple DES) is the algorithm of choice for S/MIME use because
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204most clients will support it.
205.PP
206Some old \*(L"export grade\*(R" clients may only support weak encryption using 40 or 64 bit
74dab6c2 207RC2. These can be used by passing \fIEVP_rc2_40_cbc()\fR and \fIEVP_rc2_64_cbc()\fR respectively.
984263bc 208.PP
74dab6c2 209The algorithm passed in the \fBcipher\fR parameter must support ASN1 encoding of its
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210parameters.
211.PP
212Many browsers implement a \*(L"sign and encrypt\*(R" option which is simply an S/MIME
213envelopedData containing an S/MIME signed message. This can be readily produced
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214by storing the S/MIME signed message in a memory BIO and passing it to
215\fIPKCS7_encrypt()\fR.
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216.PP
217The following flags can be passed in the \fBflags\fR parameter.
218.PP
74dab6c2 219If the \fBPKCS7_TEXT\fR flag is set MIME headers for type \fBtext/plain\fR are prepended
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220to the data.
221.PP
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222Normally the supplied content is translated into MIME canonical format (as required
223by the S/MIME specifications) if \fBPKCS7_BINARY\fR is set no translation occurs. This
984263bc 224option should be used if the supplied data is in binary format otherwise the translation
74dab6c2 225will corrupt it. If \fBPKCS7_BINARY\fR is set then \fBPKCS7_TEXT\fR is ignored.
984263bc 226.SH "RETURN VALUES"
74dab6c2 227\fIPKCS7_encrypt()\fR returns either a valid PKCS7 structure or NULL if an error occurred.
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228The error can be obtained from \fIERR_get_error\fR\|(3).
229.SH "BUGS"
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230The lack of single pass processing and need to hold all data in memory as
231mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR.
232.SH "SEE ALSO"
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233ERR_get_error(3), PKCS7_decrypt(3)
234.SH "HISTORY"
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235\fIPKCS7_decrypt()\fR was added to OpenSSL 0.9.5
236
237.rn }` ''
238.IX Title "PKCS7_encrypt 3"
239.IX Name "PKCS7_encrypt - create a PKCS#7 envelopedData structure"
240
241.IX Header "NAME"
242
243.IX Header "SYNOPSIS"
244
245.IX Header "DESCRIPTION"
246
247.IX Header "NOTES"
248
249.IX Header "RETURN VALUES"
250
251.IX Header "BUGS"
252
253.IX Header "SEE ALSO"
254
984263bc 255.IX Header "HISTORY"
74dab6c2 256