I2D\_PKCS7\_BIO\_STREAM(3ossl) OpenSSL I2D\_PKCS7\_BIO\_STREAM(3ossl)

# [NAME](#NAME)

i2d\_PKCS7\_bio\_stream - output PKCS7 structure in BER format

# [SYNOPSIS](#SYNOPSIS)

```
 #include <openssl/pkcs7.h>
 int i2d_PKCS7_bio_stream(BIO *out, PKCS7 *p7, BIO *data, int flags);
```

# [DESCRIPTION](#DESCRIPTION)

**i2d\_PKCS7\_bio\_stream()** outputs a PKCS7 structure in BER format.

It is otherwise identical to the function **SMIME\_write\_PKCS7()**.

# [NOTES](#NOTES)

This function is effectively a version of the **d2i\_PKCS7\_bio()** supporting streaming.

# [BUGS](#BUGS)

The prefix "i2d" is arguably wrong because the function outputs BER format.

# [RETURN VALUES](#RETURN_VALUES)

**i2d\_PKCS7\_bio\_stream()** returns 1 for success or 0 for failure.

# [SEE ALSO](#SEE_ALSO)

[**ERR\_get\_error**(3)](/man/os/openssl-4.0/ERR_get_error.3), [**PKCS7\_sign**(3)](/man/os/openssl-4.0/PKCS7_sign.3), [**PKCS7\_verify**(3)](/man/os/openssl-4.0/PKCS7_verify.3), [**PKCS7\_encrypt**(3)](/man/os/openssl-4.0/PKCS7_encrypt.3) [**PKCS7\_decrypt**(3)](/man/os/openssl-4.0/PKCS7_decrypt.3), [**SMIME\_write\_PKCS7**(3)](/man/os/openssl-4.0/SMIME_write_PKCS7.3), [**PEM\_write\_bio\_PKCS7\_stream**(3)](/man/os/openssl-4.0/PEM_write_bio_PKCS7_stream.3)

# [HISTORY](#HISTORY)

The **i2d\_PKCS7\_bio\_stream()** function was added in OpenSSL 1.0.0.

# [COPYRIGHT](#COPYRIGHT)

Copyright 2008-2016 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 &lt;https://www.openssl.org/source/license.html&gt;.

2026-09-29 4.0.3

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Document: i2d_PKCS7_bio_stream(3ossl) from openssl-4.0 4.0.3-r8 (Chainguard OS)