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.\" ========================================================================
.\"
.IX Title "CMS_ENCRYPTEDDATA_DECRYPT 3ossl"
.TH CMS_ENCRYPTEDDATA_DECRYPT 3ossl "2024-01-30" "3.2.1" "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"
\&\fICMS_EncryptedData_decrypt()\fR decrypts a \fIcms\fR EncryptedData object using the
symmetric \fIkey\fR of size \fIkeylen\fR bytes. \fIout\fR is a \s-1BIO\s0 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 \s-1NULL.\s0
.PP
The following flags can be passed in the \fIflags\fR parameter.
.PP
If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 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
\&\fICMS_EnvelopedData_decrypt()\fR decrypts, similarly to \fICMS_decrypt\fR\|(3),
a \s-1CMS\s0 EnvelopedData object \fIenv\fR using the symmetric key \fIsecret\fR if it
is not \s-1NULL,\s0 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 \fICMS_decrypt\fR\|(3) and the \s-1NOTES\s0 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"
\&\fICMS_EncryptedData_decrypt()\fR returns 0 if an error occurred otherwise returns 1.
.PP
\&\fICMS_EnvelopedData_decrypt()\fR returns \s-1NULL\s0 if an error occurred,
otherwise a \s-1BIO\s0 containing the decypted content.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIERR_get_error\fR\|(3), \fICMS_EncryptedData_encrypt\fR\|(3), \fICMS_decrypt\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fICMS_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 \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.