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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>

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

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

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

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

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

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).

Before using these functions, OpenSSL_add_all_algorithms(3) should be called to initialize the internal algorithm lookup tables. Otherwise errors about unknown algorithms will occur if an attempt is made to decrypt a private key.

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.
March 22, 2018 OpenBSD-current