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D2I_PRIVATEKEY(3ossl)                OpenSSL               D2I_PRIVATEKEY(3ossl)





NAME

       d2i_PrivateKey_ex, d2i_PrivateKey, d2i_PublicKey, d2i_KeyParams,
       d2i_AutoPrivateKey_ex,  d2i_AutoPrivateKey, i2d_PrivateKey,
       i2d_PublicKey, i2d_KeyParams, i2d_KeyParams_bio, d2i_PrivateKey_ex_bio,
       d2i_PrivateKey_bio, d2i_PrivateKey_ex_fp, d2i_PrivateKey_fp,
       d2i_KeyParams_bio, i2d_PrivateKey_bio, i2d_PrivateKey_fp - decode and
       encode functions for reading and saving EVP_PKEY structures


SYNOPSIS

        #include <openssl/evp.h>

        EVP_PKEY *d2i_PrivateKey_ex(int type, EVP_PKEY **a, const unsigned char **pp,
                                    long length, OSSL_LIB_CTX *libctx,
                                    const char *propq);
        EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
                                 long length);
        EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
                                long length);
        EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
                                long length);
        EVP_PKEY *d2i_AutoPrivateKey_ex(EVP_PKEY **a, const unsigned char **pp,
                                        long length, OSSL_LIB_CTX *libctx,
                                        const char *propq);
        EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
                                     long length);

        int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp);
        int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp);
        int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp);
        int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey);
        EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in);


        #include <openssl/x509.h>

        EVP_PKEY *d2i_PrivateKey_ex_bio(BIO *bp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
                                        const char *propq);
        EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
        EVP_PKEY *d2i_PrivateKey_ex_fp(FILE *fp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
                                       const char *propq);
        EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a);

        int i2d_PrivateKey_bio(BIO *bp, const EVP_PKEY *pkey);
        int i2d_PrivateKey_fp(FILE *fp, const EVP_PKEY *pkey);


DESCRIPTION

       d2i_PrivateKey_ex() decodes a private key using algorithm type. It
       attempts to use any key-specific format or PKCS#8 unencrypted
       PrivateKeyInfo format.  The type parameter should be a public key
       algorithm constant such as EVP_PKEY_RSA. An error occurs if the decoded
       key does not match type. Some private key decoding implementations may
       use cryptographic algorithms (for example to automatically derive the
       public key if it is not explicitly included in the encoding). In this
       case the supplied library context libctx and property query string propq
       are used.  If successful and the a parameter is not NULL the function
       assigns the returned EVP_PKEY structure pointer to *a, overwriting any
       previous value.

       d2i_PrivateKey(3) does the same as d2i_PrivateKey_ex() except that the
       default library context and property query string are used.
       d2i_PublicKey() does the same for public keys.  d2i_KeyParams() does the
       same for key parameters.

       The d2i_PrivateKey_ex_bio() and d2i_PrivateKey_bio() functions are
       similar to d2i_PrivateKey(3) respectively except
       that they decode the data read from the given BIO. The
       d2i_PrivateKey_ex_fp() and d2i_PrivateKey_fp() functions are the same
       except that they read the data from the given FILE.

       d2i_AutoPrivateKey_ex() and d2i_AutoPrivateKey() are similar to
       d2i_PrivateKey(3) respectively except that they
       attempt to automatically detect the private key format.

       i2d_PrivateKey() encodes a. It uses a key specific format or, if none is
       defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
       i2d_PublicKey() does the same for public keys.  i2d_KeyParams() does the
       same for key parameters.  These functions are similar to the d2i_X509()
       functions; see d2i_X509(3).  i2d_PrivateKey_bio() and i2d_PrivateKey_fp()
       do the same thing except that they encode to a BIO or FILE respectively.
       Again, these work similarly to the functions described in d2i_X509(3).


NOTES

       All the functions that operate on data in memory update the data pointer
       *pp after a successful operation, just like the other d2i and i2d
       functions; see d2i_X509(3).

       All these functions use DER format and unencrypted keys. Applications
       wishing to encrypt or decrypt private keys should use other functions
       such as d2i_PKCS8PrivateKey() instead.

       To decode a key with type EVP_PKEY_EC, d2i_PublicKey() requires *a to be
       a non-NULL EVP_PKEY structure assigned an EC_KEY structure referencing
       the proper EC_GROUP.


RETURN VALUES

       The d2i_PrivateKey(3), d2i_AutoPrivateKey_ex(),
       d2i_AutoPrivateKey(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_bio(),
       d2i_PrivateKey_ex_fp(), d2i_PrivateKey_fp(), d2i_PublicKey(),
       d2i_KeyParams() and d2i_KeyParams_bio() functions return a valid EVP_PKEY
       structure or NULL if an error occurs. The error code can be obtained by
       calling ERR_get_error(3).

       i2d_PrivateKey(), i2d_PublicKey() and i2d_KeyParams() return the number
       of bytes successfully encoded or a negative value if an error occurs. The
       error code can be obtained by calling ERR_get_error(3).

       i2d_PrivateKey_bio(), i2d_PrivateKey_fp() and i2d_KeyParams_bio() return
       1 if successfully encoded or zero if an error occurs.


SEE ALSO

       crypto(7), d2i_PKCS8PrivateKey_bio(3)


HISTORY

       d2i_PrivateKey_ex(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_ex_fp(), and
       d2i_AutoPrivateKey_ex() were added in OpenSSL 3.0.


COPYRIGHT

       Copyright 2017-2021 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>.



3.0.8                              2023-02-07              D2I_PRIVATEKEY(3ossl)

openssl 3.0.8 - Generated Thu Feb 9 15:49:49 CST 2023
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