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D2I_PKCS8PRIVATEKEY_BIO(3) Library Functions Manual D2I_PKCS8PRIVATEKEY_BIO(3)

d2i_PKCS8PrivateKey_bio, d2i_PKCS8PrivateKey_fp, i2d_PKCS8PrivateKey_bio, i2d_PKCS8PrivateKey_fp, i2d_PKCS8PrivateKey_nid_bio, i2d_PKCS8PrivateKey_nid_fp
PKCS#8 format private key functions

#include <openssl/evp.h>

EVP_PKEY *
d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u);

EVP_PKEY *
d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u);

int
i2d_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);

int
i2d_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u);

int
i2d_PKCS8PrivateKey_nid_bio(BIO *bp, EVP_PKEY *x, int nid, char *kstr, int klen, pem_password_cb *cb, void *u);

int
i2d_PKCS8PrivateKey_nid_fp(FILE *fp, EVP_PKEY *x, int nid, char *kstr, int klen, pem_password_cb *cb, void *u);

The PKCS#8 functions encode and decode private keys in PKCS#8 format using both PKCS#5 v1.5 and PKCS#5 v2.0 password based encryption algorithms.

Other than the use of DER as opposed to PEM these functions are identical to the corresponding functions described in PEM_read_PrivateKey(3).

These functions are currently the only way to store encrypted private keys using DER format.

Currently all the functions use BIO or FILE pointers. There are no functions which work directly on memory, though this can be readily worked around by converting the buffers to memory BIOs; see BIO_s_mem(3) for details.

d2i_PKCS8PrivateKey_bio() and d2i_PKCS8PrivateKey_fp() return a EVP_PKEY object or NULL if an error occurs.

i2d_PKCS8PrivateKey_bio(), i2d_PKCS8PrivateKey_fp(), i2d_PKCS8PrivateKey_nid_bio(), and i2d_PKCS8PrivateKey_nid_fp() return 1 on success or 0 on error.

d2i_X509_SIG(3), PEM_write_PKCS8PrivateKey(3), PKCS8_PRIV_KEY_INFO_new(3)

These functions first appeared in OpenSSL 0.9.5 and have been available since OpenBSD 2.7.

Do not confuse these functions with i2d_PKCS8PrivateKeyInfo_bio(3) and i2d_PKCS8PrivateKeyInfo_fp(3), which write out private keys in unencrypted DER format.
June 7, 2019 OpenBSD-current