mirror of https://github.com/openssl/openssl.git
75 lines
2.6 KiB
Plaintext
75 lines
2.6 KiB
Plaintext
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=pod
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=head1 NAME
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OPENSSL_hexchar2int,
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OPENSSL_hexstr2buf_ex, OPENSSL_hexstr2buf,
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OPENSSL_buf2hexstr_ex, OPENSSL_buf2hexstr
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- Hex encoding and decoding functions
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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int OPENSSL_hexchar2int(unsigned char c);
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int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, long *buflen,
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const char *str);
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unsigned char *OPENSSL_hexstr2buf(const char *str, long *len);
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int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlen,
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const unsigned char *buf, long buflen);
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char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen);
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=head1 DESCRIPTION
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OPENSSL_hexchar2int() converts a hexadecimal character to its numeric
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equivalent.
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OPENSSL_hexstr2buf_ex() decodes the hex string B<str> and places the
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resulting string of bytes in the given I<buf>.
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I<buf_n> gives the size of the buffer.
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If I<buflen> is not NULL, it is filled in with the result length.
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To find out how large the result will be, call this function with NULL
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for I<buf>.
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Colons between two-character hex "bytes" are accepted and ignored.
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An odd number of hex digits is an error.
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OPENSSL_hexstr2buf() does the same thing as OPENSSL_hexstr2buf_ex(),
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but allocates the space for the result, and returns the result.
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The memory is allocated by calling OPENSSL_malloc() and should be
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released by calling OPENSSL_free().
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OPENSSL_buf2hexstr_ex() encodes the contents of the given I<buf> with
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length I<buflen> and places the resulting hexadecimal character string
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in the given I<str>.
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I<str_n> gives the size of the of the string buffer.
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If I<strlen> is not NULL, it is filled in with the result length.
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To find out how large the result will be, call this function with NULL
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for I<str>.
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OPENSSL_buf2hexstr() does the same thing as OPENSSL_buf2hexstr_ex(),
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but allocates the space for the result, and returns the result.
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The memory is allocated by calling OPENSSL_malloc() and should be
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released by calling OPENSSL_free().
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=head1 RETURN VALUES
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OPENSSL_hexchar2int returns the value of a decoded hex character,
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or -1 on error.
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OPENSSL_buf2hexstr() and OPENSSL_hexstr2buf()
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return a pointer to allocated memory, or NULL on error.
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OPENSSL_buf2hexstr_ex() and OPENSSL_hexstr2buf_ex() return 1 on
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success, or 0 on error.
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=head1 COPYRIGHT
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Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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