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.\"
.IX Title "CMS_ENCRYPTEDDATA_DECRYPT 3ssl"
.TH CMS_ENCRYPTEDDATA_DECRYPT 3ssl 2024-10-23 3.4.0 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
CMS_EncryptedData_decrypt, CMS_EnvelopedData_decrypt
\&\- Decrypt CMS EncryptedData or EnvelopedData
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
\&                               const unsigned char *key, size_t keylen,
\&                               BIO *dcont, BIO *out, unsigned int flags);
\&
\& BIO *CMS_EnvelopedData_decrypt(CMS_EnvelopedData *env, BIO *detached_data,
\&                                EVP_PKEY *pkey, X509 *cert,
\&                                ASN1_OCTET_STRING *secret, unsigned int flags,
\&                                OSSL_LIB_CTX *libctx, const char *propq);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBCMS_EncryptedData_decrypt()\fR decrypts a \fIcms\fR EncryptedData object using the
symmetric \fIkey\fR of size \fIkeylen\fR bytes. \fIout\fR is a BIO to write the content
to and \fIflags\fR is an optional set of flags.
\&\fIdcont\fR is used in the rare case where the encrypted content is detached. It
will normally be set to NULL.
.PP
The following flags can be passed in the \fIflags\fR parameter.
.PP
If the \fBCMS_TEXT\fR flag is set MIME headers for type \f(CW\*(C`text/plain\*(C'\fR are deleted
from the content. If the content is not of type \f(CW\*(C`text/plain\*(C'\fR then an error is
returned.
.PP
\&\fBCMS_EnvelopedData_decrypt()\fR decrypts, similarly to \fBCMS_decrypt\fR\|(3),
a CMS EnvelopedData object \fIenv\fR using the symmetric key \fIsecret\fR if it
is not NULL, otherwise the private key of the recipient \fIpkey\fR.
If \fIpkey\fR is given, it is recommended to provide also the associated
certificate in \fIcert\fR \- see \fBCMS_decrypt\fR\|(3) and the NOTES on \fIcert\fR there.
The optional parameters \fIflags\fR and \fIdcont\fR are used as described above.
The optional parameters library context \fIlibctx\fR and property query \fIpropq\fR
are used when retrieving algorithms from providers.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBCMS_EncryptedData_decrypt()\fR returns 0 if an error occurred otherwise returns 1.
.PP
\&\fBCMS_EnvelopedData_decrypt()\fR returns NULL if an error occurred,
otherwise a BIO containing the decypted content.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBCMS_EncryptedData_encrypt\fR\|(3), \fBCMS_decrypt\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
\&\fBCMS_EnvelopedData_decrypt()\fR was added in OpenSSL 3.2.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.