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I2D_PKCS7_BIO_STREAM(3) Library Functions Manual I2D_PKCS7_BIO_STREAM(3)

i2d_PKCS7_bio_stream
output PKCS7 structure in BER format

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

i2d_PKCS7_bio_stream() outputs a PKCS7 structure in BER format. It is otherwise identical to the function SMIME_write_PKCS7(3). This function is effectively a version of d2i_PKCS7_bio(3) supporting streaming.

i2d_PKCS7_bio_stream() returns 1 for success or 0 for failure.

BIO_new(3), ERR_get_error(3), PEM_write_bio_PKCS7_stream(3), PEM_write_PKCS7(3), PKCS7_new(3), SMIME_write_PKCS7(3)

i2d_PKCS7_bio_stream() first appeared in OpenSSL 1.0.0 and has been available since OpenBSD 4.9.

The prefix "i2d" is arguably wrong because the function outputs BER format.
March 23, 2018 OpenBSD-current