CMS_ENCRYPTEDDATA_DECRYPT(3SSL) OpenSSL CMS_ENCRYPTEDDATA_DECRYPT(3SSL)
NAME
CMS_EncryptedData_decrypt, CMS_EnvelopedData_decrypt - Decrypt CMS
EncryptedData or EnvelopedData
SYNOPSIS
#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);
DESCRIPTION
CMS_EncryptedData_decrypt() decrypts a cms EncryptedData object using
the symmetric key of size keylen bytes. AEAD cipher algorithms are not
supported. out is a BIO to write the content to and flags is an optional
set of flags. dcont is used in the rare case where the encrypted content
is detached. It will normally be set to NULL.
The following flags can be passed in the flags parameter.
If the CMS_TEXT flag is set MIME headers for type "text/plain" are
deleted from the content. If the content is not of type "text/plain"
then an error is returned.
CMS_EnvelopedData_decrypt() decrypts, similarly to CMS_decrypt(3), a CMS
EnvelopedData object env using the symmetric key secret if it is not
NULL, otherwise the private key of the recipient pkey. If pkey is
given, it is recommended to provide also the associated certificate in
cert - see CMS_decrypt(3) and the NOTES on cert there. The optional
parameters flags and dcont are used as described above. The optional
parameters library context libctx and property query propq are used when
retrieving algorithms from providers.
RETURN VALUES
CMS_EncryptedData_decrypt() returns 0 if an error occurred otherwise
returns 1.
CMS_EnvelopedData_decrypt() returns NULL if an error occurred, otherwise
a BIO containing the decypted content.
SEE ALSO
ERR_get_error(3), CMS_EncryptedData_encrypt(3), CMS_decrypt(3)
HISTORY
CMS_EnvelopedData_decrypt() was added in OpenSSL 3.2.
COPYRIGHT
Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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>.
3.5.7 2026-06-09 CMS_ENCRYPTEDDATA_DECRYPT(3SSL)
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