189 lines
6.1 KiB
Groff
189 lines
6.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "CMS_decrypt 3"
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.TH CMS_decrypt 3 "2013-02-11" "1.0.1e" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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.Vb 1
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\& CMS_decrypt \- decrypt content from a CMS envelopedData structure
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.Ve
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/cms.h>
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\&
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\& int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *dcont, BIO *out, unsigned int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fICMS_decrypt()\fR extracts and decrypts the content from a \s-1CMS\s0 EnvelopedData
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structure. \fBpkey\fR is the private key of the recipient, \fBcert\fR is the
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recipient's certificate, \fBout\fR is a \s-1BIO\s0 to write the content to and
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\&\fBflags\fR is an optional set of flags.
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.PP
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The \fBdcont\fR parameter is used in the rare case where the encrypted content
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is detached. It will normally be set to \s-1NULL\s0.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIOpenSSL_add_all_algorithms()\fR (or equivalent) should be called before using this
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function or errors about unknown algorithms will occur.
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.PP
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Although the recipients certificate is not needed to decrypt the data it is
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needed to locate the appropriate (of possible several) recipients in the \s-1CMS\s0
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structure. If \fBcert\fR is set to \s-1NULL\s0 all possible recipients are tried.
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.PP
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It is possible to determine the correct recipient key by other means (for
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example looking them up in a database) and setting them in the \s-1CMS\s0 structure
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in advance using the \s-1CMS\s0 utility functions such as \fICMS_set1_pkey()\fR. In this
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case both \fBcert\fR and \fBpkey\fR should be set to \s-1NULL\s0.
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.PP
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To process KEKRecipientInfo types \fICMS_set1_key()\fR or \fICMS_RecipientInfo_set0_key()\fR
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and \fICMS_ReceipientInfo_decrypt()\fR should be called before \fICMS_decrypt()\fR and
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\&\fBcert\fR and \fBpkey\fR set to \s-1NULL\s0.
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.PP
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The following flags can be passed in the \fBflags\fR parameter.
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.PP
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If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
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from the content. If the content is not of type \fBtext/plain\fR then an error is
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returned.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fICMS_decrypt()\fR returns either 1 for success or 0 for failure.
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The error can be obtained from \fIERR_get_error\fR\|(3)
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.SH "BUGS"
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.IX Header "BUGS"
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The lack of single pass processing and the need to hold all data in memory as
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mentioned in \fICMS_verify()\fR also applies to \fICMS_decrypt()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3), \fICMS_encrypt\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fICMS_decrypt()\fR was added to OpenSSL 0.9.8
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