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4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
242 lines
7 KiB
C
242 lines
7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 The FreeBSD Foundation
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*
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* This software was developed by Ararat River Consulting, LLC under
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* sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/endian.h>
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#include <crypto/chacha20_poly1305.h>
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#include <opencrypto/xform_enc.h>
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static const uint8_t zeroes[POLY1305_BLOCK_LEN];
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void
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chacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *aad, const size_t aad_len,
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const uint8_t *nonce, const size_t nonce_len, const uint8_t *key)
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{
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const struct enc_xform *exf;
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void *ctx;
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size_t resid, todo;
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uint64_t lengths[2];
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exf = &enc_xform_chacha20_poly1305;
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ctx = __builtin_alloca(exf->ctxsize);
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exf->setkey(ctx, key, CHACHA20_POLY1305_KEY);
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exf->reinit(ctx, nonce, nonce_len);
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exf->update(ctx, aad, aad_len);
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if (aad_len % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN);
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resid = src_len;
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todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN);
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if (todo > 0) {
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exf->encrypt_multi(ctx, src, dst, todo);
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exf->update(ctx, dst, todo);
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src += todo;
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dst += todo;
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resid -= todo;
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}
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if (resid > 0) {
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exf->encrypt_last(ctx, src, dst, resid);
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exf->update(ctx, dst, resid);
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dst += resid;
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if (resid % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN);
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}
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lengths[0] = htole64(aad_len);
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lengths[1] = htole64(src_len);
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exf->update(ctx, lengths, sizeof(lengths));
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exf->final(dst, ctx);
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explicit_bzero(ctx, exf->ctxsize);
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explicit_bzero(lengths, sizeof(lengths));
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}
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bool
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chacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *aad, const size_t aad_len,
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const uint8_t *nonce, const size_t nonce_len, const uint8_t *key)
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{
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const struct enc_xform *exf;
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void *ctx;
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size_t resid, todo;
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union {
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uint64_t lengths[2];
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char tag[POLY1305_HASH_LEN];
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} u;
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bool result;
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if (src_len < POLY1305_HASH_LEN)
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return (false);
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resid = src_len - POLY1305_HASH_LEN;
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exf = &enc_xform_chacha20_poly1305;
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ctx = __builtin_alloca(exf->ctxsize);
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exf->setkey(ctx, key, CHACHA20_POLY1305_KEY);
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exf->reinit(ctx, nonce, nonce_len);
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exf->update(ctx, aad, aad_len);
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if (aad_len % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN);
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exf->update(ctx, src, resid);
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if (resid % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN);
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u.lengths[0] = htole64(aad_len);
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u.lengths[1] = htole64(resid);
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exf->update(ctx, u.lengths, sizeof(u.lengths));
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exf->final(u.tag, ctx);
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result = (timingsafe_bcmp(u.tag, src + resid, POLY1305_HASH_LEN) == 0);
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if (!result)
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goto out;
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todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN);
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if (todo > 0) {
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exf->decrypt_multi(ctx, src, dst, todo);
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src += todo;
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dst += todo;
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resid -= todo;
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}
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if (resid > 0)
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exf->decrypt_last(ctx, src, dst, resid);
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out:
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explicit_bzero(ctx, exf->ctxsize);
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explicit_bzero(&u, sizeof(u));
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return (result);
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}
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void
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xchacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *aad, const size_t aad_len,
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const uint8_t *nonce, const uint8_t *key)
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{
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const struct enc_xform *exf;
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void *ctx;
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size_t resid, todo;
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uint64_t lengths[2];
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exf = &enc_xform_xchacha20_poly1305;
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ctx = __builtin_alloca(exf->ctxsize);
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exf->setkey(ctx, key, XCHACHA20_POLY1305_KEY);
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exf->reinit(ctx, nonce, XCHACHA20_POLY1305_IV_LEN);
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exf->update(ctx, aad, aad_len);
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if (aad_len % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN);
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resid = src_len;
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todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN);
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if (todo > 0) {
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exf->encrypt_multi(ctx, src, dst, todo);
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exf->update(ctx, dst, todo);
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src += todo;
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dst += todo;
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resid -= todo;
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}
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if (resid > 0) {
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exf->encrypt_last(ctx, src, dst, resid);
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exf->update(ctx, dst, resid);
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dst += resid;
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if (resid % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN);
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}
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lengths[0] = htole64(aad_len);
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lengths[1] = htole64(src_len);
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exf->update(ctx, lengths, sizeof(lengths));
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exf->final(dst, ctx);
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explicit_bzero(ctx, exf->ctxsize);
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explicit_bzero(lengths, sizeof(lengths));
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}
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bool
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xchacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src,
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const size_t src_len, const uint8_t *aad, const size_t aad_len,
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const uint8_t *nonce, const uint8_t *key)
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{
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const struct enc_xform *exf;
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void *ctx;
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size_t resid, todo;
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union {
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uint64_t lengths[2];
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char tag[POLY1305_HASH_LEN];
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} u;
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bool result;
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if (src_len < POLY1305_HASH_LEN)
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return (false);
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resid = src_len - POLY1305_HASH_LEN;
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exf = &enc_xform_xchacha20_poly1305;
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ctx = __builtin_alloca(exf->ctxsize);
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exf->setkey(ctx, key, XCHACHA20_POLY1305_KEY);
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exf->reinit(ctx, nonce, XCHACHA20_POLY1305_IV_LEN);
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exf->update(ctx, aad, aad_len);
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if (aad_len % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN);
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exf->update(ctx, src, resid);
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if (resid % POLY1305_BLOCK_LEN != 0)
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exf->update(ctx, zeroes,
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POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN);
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u.lengths[0] = htole64(aad_len);
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u.lengths[1] = htole64(resid);
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exf->update(ctx, u.lengths, sizeof(u.lengths));
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exf->final(u.tag, ctx);
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result = (timingsafe_bcmp(u.tag, src + resid, POLY1305_HASH_LEN) == 0);
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if (!result)
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goto out;
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todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN);
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if (todo > 0) {
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exf->decrypt_multi(ctx, src, dst, todo);
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src += todo;
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dst += todo;
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resid -= todo;
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}
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if (resid > 0)
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exf->decrypt_last(ctx, src, dst, resid);
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out:
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explicit_bzero(ctx, exf->ctxsize);
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explicit_bzero(&u, sizeof(u));
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return (result);
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}
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