163 lines
4.8 KiB
Groff
163 lines
4.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "CRYPTO_MEMCMP 3"
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.TH CRYPTO_MEMCMP 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.if n .ad l
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.nh
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.SH "NAME"
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CRYPTO_memcmp \- Constant time memory comparison
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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/crypto.h>
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\&
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\& int CRYPTO_memcmp(const void *a, const void *b, size_t len);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The CRYPTO_memcmp function compares the \fBlen\fR bytes pointed to by \fBa\fR and \fBb\fR
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for equality.
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It takes an amount of time dependent on \fBlen\fR, but independent of the
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contents of the memory regions pointed to by \fBa\fR and \fBb\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fICRYPTO_memcmp()\fR returns 0 if the memory regions are equal and nonzero
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otherwise.
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.SH "NOTES"
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.IX Header "NOTES"
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Unlike \fImemcmp\fR\|(2), this function cannot be used to order the two memory regions
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as the return value when they differ is undefined, other than being nonzero.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 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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