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54 lines
3 KiB
C
54 lines
3 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/mbedtls/ssl_ciphersuites.h"
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#define S32(S) (S[0] << 24 | S[1] << 16 | S[2] << 8 | S[3])
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/**
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* Returns ciphersuite info by IANA name.
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*
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* This API provides some wiggle room for naming, e.g.
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*
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* - ECDHE-ECDSA-AES256-GCM-SHA384 (preferred)
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* - ECDHE-ECDSA-WITH-AES-256-GCM-SHA384
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* - TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384
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* - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (canonical)
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*
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* All of the above are acceptable names for 0xC02C.
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*/
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const mbedtls_ssl_ciphersuite_t *GetCipherSuite(const char *s) {
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int i, j;
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char b[50];
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uint32_t w;
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unsigned char c;
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for (i = j = w = 0; (c = s[i++]);) {
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if (c == '_') c = '-'; // _ → -
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if ('a' <= c && c <= 'z') c -= 'a' - 'A'; // a-z → A-Z
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if (c == '-' && w == S32("WITH")) j -= 5; // WITH- → -
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if (w == S32("TLS-")) j -= 4; // TLS- →
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w = w << 8 | c; // ------- ------
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if (w == S32("AES-")) continue; // AES-XXX → AESXXX
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if (w == S32("SHA1")) continue; // SHA1 → SHA
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if (!(0 <= j && j + 1 < sizeof(b))) return 0;
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b[j++] = c;
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}
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b[j++] = 0;
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return mbedtls_ssl_ciphersuite_from_string(b);
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}
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