diff --git a/sys/crypto/chacha20_poly1305.c b/sys/crypto/chacha20_poly1305.c index 938400c0feef..fd107b4e5f51 100644 --- a/sys/crypto/chacha20_poly1305.c +++ b/sys/crypto/chacha20_poly1305.c @@ -1,241 +1,241 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2021 The FreeBSD Foundation * * This software was developed by Ararat River Consulting, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include static const uint8_t zeroes[POLY1305_BLOCK_LEN]; void chacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const size_t nonce_len, const uint8_t *key) { const struct enc_xform *exf; void *ctx; size_t resid, todo; uint64_t lengths[2]; exf = &enc_xform_chacha20_poly1305; ctx = __builtin_alloca(exf->ctxsize); exf->setkey(ctx, key, CHACHA20_POLY1305_KEY); exf->reinit(ctx, nonce, nonce_len); exf->update(ctx, aad, aad_len); if (aad_len % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN); resid = src_len; todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN); if (todo > 0) { exf->encrypt_multi(ctx, src, dst, todo); exf->update(ctx, dst, todo); src += todo; dst += todo; resid -= todo; } if (resid > 0) { exf->encrypt_last(ctx, src, dst, resid); exf->update(ctx, dst, resid); dst += resid; if (resid % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN); } lengths[0] = htole64(aad_len); lengths[1] = htole64(src_len); exf->update(ctx, lengths, sizeof(lengths)); exf->final(dst, ctx); explicit_bzero(ctx, exf->ctxsize); explicit_bzero(lengths, sizeof(lengths)); } bool chacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const size_t nonce_len, const uint8_t *key) { const struct enc_xform *exf; void *ctx; size_t resid, todo; union { uint64_t lengths[2]; char tag[POLY1305_HASH_LEN]; } u; bool result; if (src_len < POLY1305_HASH_LEN) return (false); resid = src_len - POLY1305_HASH_LEN; exf = &enc_xform_chacha20_poly1305; ctx = __builtin_alloca(exf->ctxsize); exf->setkey(ctx, key, CHACHA20_POLY1305_KEY); exf->reinit(ctx, nonce, nonce_len); exf->update(ctx, aad, aad_len); if (aad_len % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN); exf->update(ctx, src, resid); if (resid % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN); u.lengths[0] = htole64(aad_len); u.lengths[1] = htole64(resid); exf->update(ctx, u.lengths, sizeof(u.lengths)); exf->final(u.tag, ctx); result = (timingsafe_bcmp(u.tag, src + resid, POLY1305_HASH_LEN) == 0); if (!result) goto out; todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN); if (todo > 0) { exf->decrypt_multi(ctx, src, dst, todo); src += todo; dst += todo; resid -= todo; } if (resid > 0) exf->decrypt_last(ctx, src, dst, resid); out: explicit_bzero(ctx, exf->ctxsize); explicit_bzero(&u, sizeof(u)); return (result); } void xchacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const uint8_t *key) { const struct enc_xform *exf; void *ctx; size_t resid, todo; uint64_t lengths[2]; exf = &enc_xform_xchacha20_poly1305; ctx = __builtin_alloca(exf->ctxsize); exf->setkey(ctx, key, XCHACHA20_POLY1305_KEY); exf->reinit(ctx, nonce, XCHACHA20_POLY1305_IV_LEN); exf->update(ctx, aad, aad_len); if (aad_len % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN); resid = src_len; todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN); if (todo > 0) { exf->encrypt_multi(ctx, src, dst, todo); exf->update(ctx, dst, todo); src += todo; dst += todo; resid -= todo; } if (resid > 0) { exf->encrypt_last(ctx, src, dst, resid); exf->update(ctx, dst, resid); dst += resid; if (resid % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN); } lengths[0] = htole64(aad_len); lengths[1] = htole64(src_len); exf->update(ctx, lengths, sizeof(lengths)); exf->final(dst, ctx); explicit_bzero(ctx, exf->ctxsize); explicit_bzero(lengths, sizeof(lengths)); } bool xchacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const uint8_t *key) { const struct enc_xform *exf; void *ctx; size_t resid, todo; union { uint64_t lengths[2]; char tag[POLY1305_HASH_LEN]; } u; bool result; if (src_len < POLY1305_HASH_LEN) return (false); resid = src_len - POLY1305_HASH_LEN; exf = &enc_xform_xchacha20_poly1305; ctx = __builtin_alloca(exf->ctxsize); exf->setkey(ctx, key, XCHACHA20_POLY1305_KEY); exf->reinit(ctx, nonce, XCHACHA20_POLY1305_IV_LEN); exf->update(ctx, aad, aad_len); if (aad_len % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - aad_len % POLY1305_BLOCK_LEN); exf->update(ctx, src, resid); if (resid % POLY1305_BLOCK_LEN != 0) exf->update(ctx, zeroes, POLY1305_BLOCK_LEN - resid % POLY1305_BLOCK_LEN); u.lengths[0] = htole64(aad_len); u.lengths[1] = htole64(resid); exf->update(ctx, u.lengths, sizeof(u.lengths)); exf->final(u.tag, ctx); result = (timingsafe_bcmp(u.tag, src + resid, POLY1305_HASH_LEN) == 0); if (!result) goto out; todo = rounddown2(resid, CHACHA20_NATIVE_BLOCK_LEN); if (todo > 0) { exf->decrypt_multi(ctx, src, dst, todo); src += todo; dst += todo; resid -= todo; } if (resid > 0) exf->decrypt_last(ctx, src, dst, resid); out: explicit_bzero(ctx, exf->ctxsize); explicit_bzero(&u, sizeof(u)); return (result); } diff --git a/sys/crypto/chacha20_poly1305.h b/sys/crypto/chacha20_poly1305.h index 505a5ef9d6f0..afdcb92d91ba 100644 --- a/sys/crypto/chacha20_poly1305.h +++ b/sys/crypto/chacha20_poly1305.h @@ -1,54 +1,54 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2021 The FreeBSD Foundation * * This software was developed by Ararat River Consulting, LLC under * sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef __CRYPTO_CHACHA20_POLY1305_H__ #define __CRYPTO_CHACHA20_POLY1305_H__ #include /* The Poly1305 tag is appended to the cipher text. */ void chacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const size_t nonce_len, const uint8_t *key); bool chacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const size_t nonce_len, const uint8_t *key); void xchacha20_poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const uint8_t *key); bool xchacha20_poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len, const uint8_t *aad, const size_t aad_len, const uint8_t *nonce, const uint8_t *key); #endif /* !__CRYPTO_CHACHA20_POLY1305_H__ */