I2D_PKCS7_BIO_STREAM(3ossl)

💖 i2d_PKCS7_bio_stream — the 3ossl manual, but make it make sense 💖

okay bestie, gather round, because we're talking about i2d_PKCS7_bio_stream from the 3ossl manual, and it's lowkey one of those functions that's like... doing the most but also not that deep? ✨

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✨ NAME ✨

i2d_PKCS7_bio_stream — bestie, it outputs a PKCS7 structure in BER format. that's the whole vibe. that's the job. 💅

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🌸 SYNOPSIS 🌸

#include <openssl/pkcs7.h>

int i2d_PKCS7_bio_stream(BIO *out, PKCS7 *p7, BIO *data, int flags);

yes she takes four args, no we're not scared, come on now 🫶

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💜 DESCRIPTION 💜

so i2d_PKCS7_bio_stream() outputs a PKCS7 structure in BER format. periodt. that's what she does.

other than that? it is otherwise identical to the function SMIME_write_PKCS7(). like literally the same girl, different name tag. no cap. 🎀

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🦋 NOTES 🦋

this function is effectively a version of the d2i_PKCS7_bio() that's supporting streaming. so if you were wondering why she's built different, that's why. iykyk 😌

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💀 BUGS 💀

the prefix "i2d" is arguably wrong, because this function outputs BER format. yeah. the name is lying to you a little bit. it's giving "trust me bro" energy. 🙈

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⭐ RETURN VALUES ⭐

i2d_PKCS7_bio_stream() returns 1 for success, or 0 for failure. that's it. no in-between, no drama, no "it depends." slay. 👑

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🌈 SEE ALSO 🌈

go read these too, bestie, they're all in the group chat:

• ERR_get_error(3)
• PKCS7_sign(3)
• PKCS7_verify(3)
• PKCS7_encrypt(3)
• PKCS7_decrypt(3)
• SMIME_write_PKCS7(3)
• PEM_write_bio_PKCS7_stream(3)

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🎀 HISTORY 🎀

the i2d_PKCS7_bio_stream() function was added in OpenSSL 1.0.0. so she's been around a minute. a legend, honestly. 💖

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👑 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 <https://www.openssl.org/source/license.html>.

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and that's the whole page, bestie!! 🧚 this was OpenSSL 3.5.9, dated 2026-09-29, and it's the I2D_PKCS7_BIO_STREAM(3ossl) manual. go stream something in BER format, you absolute icon. 🍓💜✨