266 lines
10 KiB
Plaintext
266 lines
10 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "D2I_PRIVATEKEY 3ossl"
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.TH D2I_PRIVATEKEY 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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d2i_PrivateKey_ex, d2i_PrivateKey, d2i_PublicKey, d2i_KeyParams,
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d2i_AutoPrivateKey_ex, d2i_AutoPrivateKey, i2d_PrivateKey, i2d_PublicKey,
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i2d_KeyParams, i2d_KeyParams_bio, d2i_PrivateKey_ex_bio, d2i_PrivateKey_bio,
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d2i_PrivateKey_ex_fp, d2i_PrivateKey_fp, d2i_KeyParams_bio, i2d_PrivateKey_bio,
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i2d_PrivateKey_fp
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\&\- decode and encode functions for reading and saving EVP_PKEY structures
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& EVP_PKEY *d2i_PrivateKey_ex(int type, EVP_PKEY **a, const unsigned char **pp,
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\& long length, OSSL_LIB_CTX *libctx,
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\& const char *propq);
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\& EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
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\& long length);
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\& EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
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\& long length);
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\& EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
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\& long length);
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\& EVP_PKEY *d2i_AutoPrivateKey_ex(EVP_PKEY **a, const unsigned char **pp,
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\& long length, OSSL_LIB_CTX *libctx,
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\& const char *propq);
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\& EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
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\& long length);
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\&
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\& int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp);
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\& int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp);
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\& int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp);
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\& int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey);
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\& EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in);
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\&
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\&
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\& #include <openssl/x509.h>
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\&
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\& EVP_PKEY *d2i_PrivateKey_ex_bio(BIO *bp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
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\& const char *propq);
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\& EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
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\& EVP_PKEY *d2i_PrivateKey_ex_fp(FILE *fp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
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\& const char *propq);
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\& EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a);
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\&
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\& int i2d_PrivateKey_bio(BIO *bp, const EVP_PKEY *pkey);
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\& int i2d_PrivateKey_fp(FILE *fp, const EVP_PKEY *pkey);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fId2i_PrivateKey_ex()\fR decodes a private key using algorithm \fItype\fR. It attempts
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to use any key-specific format or PKCS#8 unencrypted PrivateKeyInfo format.
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The \fItype\fR parameter should be a public key algorithm constant such as
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\&\fB\s-1EVP_PKEY_RSA\s0\fR. An error occurs if the decoded key does not match \fItype\fR. Some
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private key decoding implementations may use cryptographic algorithms (for
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example to automatically derive the public key if it is not explicitly
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included in the encoding). In this case the supplied library context \fIlibctx\fR
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and property query string \fIpropq\fR are used.
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If successful and the \fIa\fR parameter is not \s-1NULL\s0 the function assigns the
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returned \fB\s-1EVP_PKEY\s0\fR structure pointer to \fI*a\fR, overwriting any previous value.
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.PP
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\&\fId2i_PrivateKey()\fR does the same as \fId2i_PrivateKey_ex()\fR except that the default
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library context and property query string are used.
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\&\fId2i_PublicKey()\fR does the same for public keys.
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\&\fId2i_KeyParams()\fR does the same for key parameters.
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.PP
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The \fId2i_PrivateKey_ex_bio()\fR and \fId2i_PrivateKey_bio()\fR functions are similar to
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\&\fId2i_PrivateKey_ex()\fR and \fId2i_PrivateKey()\fR respectively except that they decode
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the data read from the given \s-1BIO.\s0 The \fId2i_PrivateKey_ex_fp()\fR and
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\&\fId2i_PrivateKey_fp()\fR functions are the same except that they read the data from
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the given \s-1FILE.\s0
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.PP
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\&\fId2i_AutoPrivateKey_ex()\fR and \fId2i_AutoPrivateKey()\fR are similar to
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\&\fId2i_PrivateKey_ex()\fR and \fId2i_PrivateKey()\fR respectively except that they attempt
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to automatically detect the private key format.
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.PP
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\&\fIi2d_PrivateKey()\fR encodes \fIa\fR. It uses a key specific format or, if none is
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defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
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\&\fIi2d_PublicKey()\fR does the same for public keys.
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\&\fIi2d_KeyParams()\fR does the same for key parameters.
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These functions are similar to the \fId2i_X509()\fR functions; see \fId2i_X509\fR\|(3).
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\&\fIi2d_PrivateKey_bio()\fR and \fIi2d_PrivateKey_fp()\fR do the same thing except that they
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encode to a \fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR respectively. Again, these work similarly to the
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functions described in \fId2i_X509\fR\|(3).
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.SH "NOTES"
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.IX Header "NOTES"
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All the functions that operate on data in memory update the data pointer \fI*pp\fR
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after a successful operation, just like the other d2i and i2d functions;
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see \fId2i_X509\fR\|(3).
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.PP
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All these functions use \s-1DER\s0 format and unencrypted keys. Applications wishing
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to encrypt or decrypt private keys should use other functions such as
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\&\fId2i_PKCS8PrivateKey()\fR instead.
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.PP
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To decode a key with type \fB\s-1EVP_PKEY_EC\s0\fR, \fId2i_PublicKey()\fR requires \fI*a\fR to be
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a non-NULL \s-1EVP_PKEY\s0 structure assigned an \s-1EC_KEY\s0 structure referencing the proper
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\&\s-1EC_GROUP.\s0
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The \fId2i_PrivateKey_ex()\fR, \fId2i_PrivateKey()\fR, \fId2i_AutoPrivateKey_ex()\fR,
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\&\fId2i_AutoPrivateKey()\fR, \fId2i_PrivateKey_ex_bio()\fR, \fId2i_PrivateKey_bio()\fR,
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\&\fId2i_PrivateKey_ex_fp()\fR, \fId2i_PrivateKey_fp()\fR, \fId2i_PublicKey()\fR, \fId2i_KeyParams()\fR
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and \fId2i_KeyParams_bio()\fR functions return a valid \fB\s-1EVP_PKEY\s0\fR structure or \s-1NULL\s0 if
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an error occurs. The error code can be obtained by calling \fIERR_get_error\fR\|(3).
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.PP
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\&\fIi2d_PrivateKey()\fR, \fIi2d_PublicKey()\fR and \fIi2d_KeyParams()\fR return the number of
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bytes successfully encoded or a negative value if an error occurs. The error
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code can be obtained by calling \fIERR_get_error\fR\|(3).
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.PP
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\&\fIi2d_PrivateKey_bio()\fR, \fIi2d_PrivateKey_fp()\fR and \fIi2d_KeyParams_bio()\fR return 1 if
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successfully encoded or zero if an error occurs.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIcrypto\fR\|(7),
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\&\fId2i_PKCS8PrivateKey_bio\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fId2i_PrivateKey_ex()\fR, \fId2i_PrivateKey_ex_bio()\fR, \fId2i_PrivateKey_ex_fp()\fR, and
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\&\fId2i_AutoPrivateKey_ex()\fR were added in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2021 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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