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b077aed33b
Migrate to OpenSSL 3.0 in advance of FreeBSD 14.0. OpenSSL 1.1.1 (the version we were previously using) will be EOL as of 2023-09-11. Most of the base system has already been updated for a seamless switch to OpenSSL 3.0. For many components we've added `-DOPENSSL_API_COMPAT=0x10100000L` to CFLAGS to specify the API version, which avoids deprecation warnings from OpenSSL 3.0. Changes have also been made to avoid OpenSSL APIs that were already deprecated in OpenSSL 1.1.1. The process of updating to contemporary APIs can continue after this merge. Additional changes are still required for libarchive and Kerberos- related libraries or tools; workarounds will immediately follow this commit. Fixes are in progress in the upstream projects and will be incorporated when those are next updated. There are some performance regressions in benchmarks (certain tests in `openssl speed`) and in some OpenSSL consumers in ports (e.g. haproxy). Investigation will continue for these. Netflix's testing showed no functional regression and a rather small, albeit statistically significant, increase in CPU consumption with OpenSSL 3.0. Thanks to ngie@ and des@ for updating base system components, to antoine@ and bofh@ for ports exp-runs and port fixes/workarounds, and to Netflix and everyone who tested prior to commit or contributed to this update in other ways. PR: 271615 PR: 271656 [exp-run] Relnotes: Yes Sponsored by: The FreeBSD Foundation
212 lines
6.6 KiB
Groff
212 lines
6.6 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "MDC2_INIT 3"
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.TH MDC2_INIT 3 "2023-05-30" "3.0.9" "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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MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function
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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/mdc2.h>
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.Ve
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.PP
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
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see \fBopenssl_user_macros\fR\|(7):
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.PP
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.Vb 2
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\& unsigned char *MDC2(const unsigned char *d, unsigned long n,
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\& unsigned char *md);
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\&
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\& int MDC2_Init(MDC2_CTX *c);
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\& int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
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\& unsigned long len);
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\& int MDC2_Final(unsigned char *md, MDC2_CTX *c);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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All of the functions described on this page are deprecated.
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Applications should instead use \fBEVP_DigestInit_ex\fR\|(3), \fBEVP_DigestUpdate\fR\|(3)
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and \fBEVP_DigestFinal_ex\fR\|(3).
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.PP
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\&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from
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block ciphers. These functions are an implementation of \s-1MDC2\s0 with
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\&\s-1DES.\s0
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.PP
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\&\s-1\fBMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR
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bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
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\&\s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest
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is placed in a static array.
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.PP
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The following functions may be used if the message is not completely
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stored in memory:
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.PP
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\&\fBMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure.
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.PP
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\&\fBMDC2_Update()\fR can be called repeatedly with chunks of the message to
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be hashed (\fBlen\fR bytes at \fBdata\fR).
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.PP
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\&\fBMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space
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for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR.
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.PP
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Applications should use the higher level functions
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\&\fBEVP_DigestInit\fR\|(3) etc. instead of calling the
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hash functions directly.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\s-1\fBMDC2\s0()\fR returns a pointer to the hash value.
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.PP
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\&\fBMDC2_Init()\fR, \fBMDC2_Update()\fR and \fBMDC2_Final()\fR return 1 for success, 0 otherwise.
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1ISO/IEC 10118\-2:2000\s0 Hash-Function 2, with \s-1DES\s0 as the underlying block cipher.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBEVP_DigestInit\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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All of these functions were deprecated in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-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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