Synopsis #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);
DESCRIPTIONThe 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 PEM function
as described in the pem(3) manual page.
NOTESBefore 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 BIOs or FILE pointers, there
are no functions which work directly on memory: this can be readily
worked around by converting the buffers to memory BIOs, see BIO_s_mem(3) for
details.
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CRYPTO Application Programming Interface (API)... 
