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Last change
on this file since 101021 was 101021, checked in by vboxsync, 15 months ago |
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openssl-3.1.2: Applied and adjusted our OpenSSL changes to 3.1.0. bugref:10519
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File size:
1.0 KB
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| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | CRYPTO_memcmp - Constant time memory comparison
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| 6 |
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| 7 | =head1 SYNOPSIS
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| 8 |
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| 9 | #include <openssl/crypto.h>
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| 10 |
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| 11 | int CRYPTO_memcmp(const void *a, const void *b, size_t len);
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| 12 |
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| 13 | =head1 DESCRIPTION
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| 14 |
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| 15 | The CRYPTO_memcmp function compares the B<len> bytes pointed to by B<a> and B<b>
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| 16 | for equality.
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| 17 | It takes an amount of time dependent on B<len>, but independent of the
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| 18 | contents of the memory regions pointed to by B<a> and B<b>.
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| 19 |
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| 20 | =head1 RETURN VALUES
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| 21 |
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| 22 | CRYPTO_memcmp() returns 0 if the memory regions are equal and nonzero
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| 23 | otherwise.
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| 24 |
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| 25 | =head1 NOTES
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| 26 |
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| 27 | Unlike memcmp(2), this function cannot be used to order the two memory regions
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| 28 | as the return value when they differ is undefined, other than being nonzero.
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| 29 |
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| 30 | =head1 COPYRIGHT
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| 31 |
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| 32 | Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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| 33 |
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| 34 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 35 | this file except in compliance with the License. You can obtain a copy
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| 36 | in the file LICENSE in the source distribution or at
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| 37 | L<https://www.openssl.org/source/license.html>.
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| 38 |
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| 39 | =cut
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