summaryrefslogtreecommitdiff
path: root/code/ecp/crypto/e_chacha20poly1305.c
diff options
context:
space:
mode:
Diffstat (limited to 'code/ecp/crypto/e_chacha20poly1305.c')
-rw-r--r--code/ecp/crypto/e_chacha20poly1305.c229
1 files changed, 0 insertions, 229 deletions
diff --git a/code/ecp/crypto/e_chacha20poly1305.c b/code/ecp/crypto/e_chacha20poly1305.c
deleted file mode 100644
index 17fcab8..0000000
--- a/code/ecp/crypto/e_chacha20poly1305.c
+++ /dev/null
@@ -1,229 +0,0 @@
-/* $OpenBSD: e_chacha20poly1305.c,v 1.15 2017/01/29 17:49:23 beck Exp $ */
-
-/*
- * Copyright (c) 2015 Reyk Floter <reyk@openbsd.org>
- * Copyright (c) 2014, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <stdint.h>
-#include <string.h>
-
-#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
-
-#include <compat.h>
-#include <chacha.h>
-#include <poly1305.h>
-
-#define POLY1305_TAG_LEN 16
-#define CHACHA20_NONCE_LEN_OLD 8
-
-/*
- * The informational RFC 7539, "ChaCha20 and Poly1305 for IETF Protocols",
- * introduced a modified AEAD construction that is incompatible with the
- * common style that has been already used in TLS. The IETF version also
- * adds a constant (salt) that is prepended to the nonce.
- */
-#define CHACHA20_CONSTANT_LEN 4
-#define CHACHA20_IV_LEN 8
-#define CHACHA20_NONCE_LEN (CHACHA20_CONSTANT_LEN + CHACHA20_IV_LEN)
-
-
-static void
-poly1305_update_with_length(poly1305_state *poly1305,
- const unsigned char *data, size_t data_len)
-{
- size_t j = data_len;
- unsigned char length_bytes[8];
- unsigned i;
-
- for (i = 0; i < sizeof(length_bytes); i++) {
- length_bytes[i] = j;
- j >>= 8;
- }
-
- if (data != NULL)
- CRYPTO_poly1305_update(poly1305, data, data_len);
- CRYPTO_poly1305_update(poly1305, length_bytes, sizeof(length_bytes));
-}
-
-static void
-poly1305_update_with_pad16(poly1305_state *poly1305,
- const unsigned char *data, size_t data_len)
-{
- static const unsigned char zero_pad16[16];
- size_t pad_len;
-
- CRYPTO_poly1305_update(poly1305, data, data_len);
-
- /* pad16() is defined in RFC 7539 2.8.1. */
- if ((pad_len = data_len % 16) == 0)
- return;
-
- CRYPTO_poly1305_update(poly1305, zero_pad16, 16 - pad_len);
-}
-
-int
-aead_chacha20_poly1305_seal(unsigned char *out, size_t *out_len,
- size_t max_out_len, unsigned char key[32], unsigned char tag_len,
- const unsigned char *nonce, size_t nonce_len,
- const unsigned char *in, size_t in_len,
- const unsigned char *ad, size_t ad_len)
-{
- unsigned char poly1305_key[32];
- poly1305_state poly1305;
- const unsigned char *iv;
- const uint64_t in_len_64 = in_len;
- uint64_t ctr;
-
- /* The underlying ChaCha implementation may not overflow the block
- * counter into the second counter word. Therefore we disallow
- * individual operations that work on more than 2TB at a time.
- * in_len_64 is needed because, on 32-bit platforms, size_t is only
- * 32-bits and this produces a warning because it's always false.
- * Casting to uint64_t inside the conditional is not sufficient to stop
- * the warning. */
- if (in_len_64 >= (1ULL << 32) * 64 - 64) {
- // EVPerror(EVP_R_TOO_LARGE);
- return 0;
- }
-
- if (max_out_len < in_len + tag_len) {
- // EVPerror(EVP_R_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (nonce_len == CHACHA20_NONCE_LEN_OLD) {
- /* Google's draft-agl-tls-chacha20poly1305-04, Nov 2013 */
-
- memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key,
- sizeof(poly1305_key), key, nonce, 0);
-
- CRYPTO_poly1305_init(&poly1305, poly1305_key);
- poly1305_update_with_length(&poly1305, ad, ad_len);
- CRYPTO_chacha_20(out, in, in_len, key, nonce, 1);
- poly1305_update_with_length(&poly1305, out, in_len);
- } else if (nonce_len == CHACHA20_NONCE_LEN) {
- /* RFC 7539, May 2015 */
-
- ctr = (uint64_t)(nonce[0] | nonce[1] << 8 |
- nonce[2] << 16 | nonce[3] << 24) << 32;
- iv = nonce + CHACHA20_CONSTANT_LEN;
-
- memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key,
- sizeof(poly1305_key), key, iv, ctr);
-
- CRYPTO_poly1305_init(&poly1305, poly1305_key);
- poly1305_update_with_pad16(&poly1305, ad, ad_len);
- CRYPTO_chacha_20(out, in, in_len, key, iv, ctr + 1);
- poly1305_update_with_pad16(&poly1305, out, in_len);
- poly1305_update_with_length(&poly1305, NULL, ad_len);
- poly1305_update_with_length(&poly1305, NULL, in_len);
- }
-
- if (tag_len != POLY1305_TAG_LEN) {
- unsigned char tag[POLY1305_TAG_LEN];
- CRYPTO_poly1305_finish(&poly1305, tag);
- memcpy(out + in_len, tag, tag_len);
- *out_len = in_len + tag_len;
- return 1;
- }
-
- CRYPTO_poly1305_finish(&poly1305, out + in_len);
- *out_len = in_len + POLY1305_TAG_LEN;
- return 1;
-}
-
-int
-aead_chacha20_poly1305_open(unsigned char *out, size_t *out_len,
- size_t max_out_len, unsigned char key[32], unsigned char tag_len,
- const unsigned char *nonce, size_t nonce_len,
- const unsigned char *in, size_t in_len,
- const unsigned char *ad, size_t ad_len)
-{
- unsigned char mac[POLY1305_TAG_LEN];
- unsigned char poly1305_key[32];
- const unsigned char *iv = nonce;
- poly1305_state poly1305;
- const uint64_t in_len_64 = in_len;
- size_t plaintext_len;
- uint64_t ctr = 0;
-
- if (in_len < tag_len) {
- // EVPerror(EVP_R_BAD_DECRYPT);
- return 0;
- }
-
- /* The underlying ChaCha implementation may not overflow the block
- * counter into the second counter word. Therefore we disallow
- * individual operations that work on more than 2TB at a time.
- * in_len_64 is needed because, on 32-bit platforms, size_t is only
- * 32-bits and this produces a warning because it's always false.
- * Casting to uint64_t inside the conditional is not sufficient to stop
- * the warning. */
- if (in_len_64 >= (1ULL << 32) * 64 - 64) {
- // EVPerror(EVP_R_TOO_LARGE);
- return 0;
- }
-
- plaintext_len = in_len - tag_len;
-
- if (max_out_len < plaintext_len) {
- // EVPerror(EVP_R_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (nonce_len == CHACHA20_NONCE_LEN_OLD) {
- /* Google's draft-agl-tls-chacha20poly1305-04, Nov 2013 */
-
- memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key,
- sizeof(poly1305_key), key, nonce, 0);
-
- CRYPTO_poly1305_init(&poly1305, poly1305_key);
- poly1305_update_with_length(&poly1305, ad, ad_len);
- poly1305_update_with_length(&poly1305, in, plaintext_len);
- } else if (nonce_len == CHACHA20_NONCE_LEN) {
- /* RFC 7539, May 2015 */
-
- ctr = (uint64_t)(nonce[0] | nonce[1] << 8 |
- nonce[2] << 16 | nonce[3] << 24) << 32;
- iv = nonce + CHACHA20_CONSTANT_LEN;
-
- memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key,
- sizeof(poly1305_key), key, iv, ctr);
-
- CRYPTO_poly1305_init(&poly1305, poly1305_key);
- poly1305_update_with_pad16(&poly1305, ad, ad_len);
- poly1305_update_with_pad16(&poly1305, in, plaintext_len);
- poly1305_update_with_length(&poly1305, NULL, ad_len);
- poly1305_update_with_length(&poly1305, NULL, plaintext_len);
- }
-
- CRYPTO_poly1305_finish(&poly1305, mac);
-
- if (timingsafe_memcmp(mac, in + plaintext_len, tag_len) != 0) {
- // EVPerror(EVP_R_BAD_DECRYPT);
- return 0;
- }
-
- CRYPTO_chacha_20(out, in, plaintext_len, key, iv, ctr + 1);
- *out_len = plaintext_len;
- return 1;
-}
-
-#endif /* !OPENSSL_NO_CHACHA && !OPENSSL_NO_POLY1305 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-20 08:50:34 +0000