59 lines
2 KiB
Text
59 lines
2 KiB
Text
=pod
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=head1 NAME
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d2i_Private_key, d2i_AutoPrivateKey, i2d_PrivateKey - decode and encode
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functions for reading and saving EVP_PKEY structures.
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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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_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
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long length);
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int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp);
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=head1 DESCRIPTION
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d2i_PrivateKey() decodes a private key using algorithm B<type>. It attempts to
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use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The
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B<type> parameter should be a public key algorithm constant such as
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B<EVP_PKEY_RSA>. An error occurs if the decoded key does not match B<type>.
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d2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to
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automatically detect the private key format.
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i2d_PrivateKey() encodes B<key>. 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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These functions are similar to the d2i_X509() functions, and you should refer to
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that page for a detailed description (see L<d2i_X509(3)>).
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=head1 NOTES
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All these functions use DER 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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d2i_PKC8PrivateKey() instead.
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If the B<*a> is not NULL when calling d2i_PrivateKey() or d2i_AutoPrivateKey()
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(i.e. an existing structure is being reused) and the key format is PKCS#8
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then B<*a> will be freed and replaced on a successful call.
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=head1 RETURN VALUES
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d2i_PrivateKey() and d2i_AutoPrivateKey() return a valid B<EVP_KEY> structure
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or B<NULL> if an error occurs. The error code can be obtained by calling
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L<ERR_get_error(3)>.
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i2d_PrivateKey() returns the number of bytes successfully encoded or a
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negative value if an error occurs. The error code can be obtained by calling
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L<ERR_get_error(3)>.
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=head1 SEE ALSO
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L<crypto(3)>,
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L<d2i_PKCS8PrivateKey(3)>
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=cut
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