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[dragonfly.git] / secure / lib / libcrypto / man / PKCS7_decrypt.3
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129.\" ========================================================================
130.\"
131.IX Title "PKCS7_decrypt 3"
aac4ff6f 132.TH PKCS7_decrypt 3 "2008-09-06" "0.9.8h" "OpenSSL"
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133.SH "NAME"
134PKCS7_decrypt \- decrypt content from a PKCS#7 envelopedData structure
135.SH "SYNOPSIS"
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136.IX Header "SYNOPSIS"
137int PKCS7_decrypt(\s-1PKCS7\s0 *p7, \s-1EVP_PKEY\s0 *pkey, X509 *cert, \s-1BIO\s0 *data, int flags);
984263bc 138.SH "DESCRIPTION"
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139.IX Header "DESCRIPTION"
140\&\fIPKCS7_decrypt()\fR extracts and decrypts the content from a PKCS#7 envelopedData
984263bc 141structure. \fBpkey\fR is the private key of the recipient, \fBcert\fR is the
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142recipients certificate, \fBdata\fR is a \s-1BIO\s0 to write the content to and
143\&\fBflags\fR is an optional set of flags.
984263bc 144.SH "NOTES"
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145.IX Header "NOTES"
146\&\fIOpenSSL_add_all_algorithms()\fR (or equivalent) should be called before using this
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147function or errors about unknown algorithms will occur.
148.PP
149Although the recipients certificate is not needed to decrypt the data it is needed
150to locate the appropriate (of possible several) recipients in the PKCS#7 structure.
151.PP
152The following flags can be passed in the \fBflags\fR parameter.
153.PP
8b0cefbb 154If 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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155from the content. If the content is not of type \fBtext/plain\fR then an error is
156returned.
157.SH "RETURN VALUES"
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158.IX Header "RETURN VALUES"
159\&\fIPKCS7_decrypt()\fR returns either 1 for success or 0 for failure.
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160The error can be obtained from \fIERR_get_error\fR\|(3)
161.SH "BUGS"
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162.IX Header "BUGS"
163\&\fIPKCS7_decrypt()\fR must be passed the correct recipient key and certificate. It would
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164be better if it could look up the correct key and certificate from a database.
165.PP
166The lack of single pass processing and need to hold all data in memory as
167mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR.
168.SH "SEE ALSO"
74dab6c2 169.IX Header "SEE ALSO"
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170\&\fIERR_get_error\fR\|(3), \fIPKCS7_encrypt\fR\|(3)
171.SH "HISTORY"
984263bc 172.IX Header "HISTORY"
8b0cefbb 173\&\fIPKCS7_decrypt()\fR was added to OpenSSL 0.9.5