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Title "D2I_PRIVATEKEY 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fBd2i_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 \fB\s-1EVP_PKEY_RSA\s0. 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 \s-1NULL\s0 the function assigns the returned \s-1EVP_PKEY\s0 structure pointer to *a, overwriting any previous value.

\fBd2i_PrivateKey() does the same as d2i_PrivateKey_ex() except that the default library context and property query string are used. \fBd2i_PublicKey() does the same for public keys. \fBd2i_KeyParams() does the same for key parameters.

The d2i_PrivateKey_ex_bio() and d2i_PrivateKey_bio() functions are similar to \fBd2i_PrivateKey_ex() and d2i_PrivateKey() respectively except that they decode the data read from the given \s-1BIO.\s0 The d2i_PrivateKey_ex_fp() and \fBd2i_PrivateKey_fp() functions are the same except that they read the data from the given \s-1FILE.\s0

\fBd2i_AutoPrivateKey_ex() and d2i_AutoPrivateKey() are similar to \fBd2i_PrivateKey_ex() and d2i_PrivateKey() respectively except that they attempt to automatically detect the private key format.

\fBi2d_PrivateKey() encodes a. It uses a key specific format or, if none is defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format. \fBi2d_PublicKey() does the same for public keys. \fBi2d_KeyParams() does the same for key parameters. These functions are similar to the d2i_X509() functions; see d2i_X509\|(3). \fBi2d_PrivateKey_bio() and i2d_PrivateKey_fp() do the same thing except that they encode to a \s-1BIO\s0 or \s-1FILE\s0 respectively. Again, these work similarly to the functions described in d2i_X509\|(3).

Header "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 \s-1DER\s0 format and unencrypted keys. Applications wishing to encrypt or decrypt private keys should use other functions such as \fBd2i_PKCS8PrivateKey() instead.

To decode a key with type \s-1EVP_PKEY_EC\s0, d2i_PublicKey() requires *a to be a non-NULL \s-1EVP_PKEY\s0 structure assigned an \s-1EC_KEY\s0 structure referencing the proper \s-1EC_GROUP.\s0

Header "RETURN VALUES" The d2i_PrivateKey_ex(), d2i_PrivateKey(), d2i_AutoPrivateKey_ex(), \fBd2i_AutoPrivateKey(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_bio(), \fBd2i_PrivateKey_ex_fp(), d2i_PrivateKey_fp(), d2i_PublicKey(), d2i_KeyParams() and d2i_KeyParams_bio() functions return a valid \s-1EVP_PKEY\s0 structure or \s-1NULL\s0 if an error occurs. The error code can be obtained by calling ERR_get_error\|(3).

\fBi2d_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).

\fBi2d_PrivateKey_bio(), i2d_PrivateKey_fp() and i2d_KeyParams_bio() return 1 if successfully encoded or zero if an error occurs.

Header "SEE ALSO" \fBcrypto\|(7), \fBd2i_PKCS8PrivateKey_bio\|(3) Header "HISTORY" \fBd2i_PrivateKey_ex(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_ex_fp(), and \fBd2i_AutoPrivateKey_ex() were added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.