diff options
Diffstat (limited to 'crypto/libressl/crypto/aead/e_chacha20poly1305.c')
| -rw-r--r-- | crypto/libressl/crypto/aead/e_chacha20poly1305.c | 395 |
1 files changed, 0 insertions, 395 deletions
diff --git a/crypto/libressl/crypto/aead/e_chacha20poly1305.c b/crypto/libressl/crypto/aead/e_chacha20poly1305.c deleted file mode 100644 index 9d8291e..0000000 --- a/crypto/libressl/crypto/aead/e_chacha20poly1305.c +++ /dev/null @@ -1,395 +0,0 @@ -/* $OpenBSD: e_chacha20poly1305.c,v 1.21 2019/03/27 15:34:01 jsing 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> - -#include <openssl/opensslconf.h> - -#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305) - -//#include <openssl/err.h> -//#include <openssl/evp.h> -#include <openssl/chacha.h> -#include <openssl/poly1305.h> - -//#include "evp_locl.h" -#define EVPerror(X) ; - -#define POLY1305_TAG_LEN 16 - -#define CHACHA20_CONSTANT_LEN 4 -#define CHACHA20_IV_LEN 8 -#define CHACHA20_NONCE_LEN (CHACHA20_CONSTANT_LEN + CHACHA20_IV_LEN) -#define XCHACHA20_NONCE_LEN 24 - -#if 0 -struct aead_chacha20_poly1305_ctx { - unsigned char key[32]; - unsigned char tag_len; -}; - -static int -aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const unsigned char *key, - size_t key_len, size_t tag_len) -{ - struct aead_chacha20_poly1305_ctx *c20_ctx; - - if (tag_len == 0) - tag_len = POLY1305_TAG_LEN; - - if (tag_len > POLY1305_TAG_LEN) { - EVPerror(EVP_R_TOO_LARGE); - return 0; - } - - /* Internal error - EVP_AEAD_CTX_init should catch this. */ - if (key_len != sizeof(c20_ctx->key)) - return 0; - - c20_ctx = malloc(sizeof(struct aead_chacha20_poly1305_ctx)); - if (c20_ctx == NULL) - return 0; - - memcpy(&c20_ctx->key[0], key, key_len); - c20_ctx->tag_len = tag_len; - ctx->aead_state = c20_ctx; - - return 1; -} - -static void -aead_chacha20_poly1305_cleanup(EVP_AEAD_CTX *ctx) -{ - struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state; - - freezero(c20_ctx, sizeof(*c20_ctx)); -} - -#endif - -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 key[32], unsigned char tag_len, - unsigned char *out, size_t *out_len, size_t max_out_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) { - EVPerror(EVP_R_IV_TOO_LARGE); - return 0; - } - - ctr = (uint64_t)((uint32_t)(nonce[0]) | (uint32_t)(nonce[1]) << 8 | - (uint32_t)(nonce[2]) << 16 | (uint32_t)(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 key[32], unsigned char tag_len, - unsigned char *out, size_t *out_len, size_t max_out_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; - } - - if (nonce_len != CHACHA20_NONCE_LEN) { - EVPerror(EVP_R_IV_TOO_LARGE); - return 0; - } - - plaintext_len = in_len - tag_len; - - if (max_out_len < plaintext_len) { - EVPerror(EVP_R_BUFFER_TOO_SMALL); - return 0; - } - - ctr = (uint64_t)((uint32_t)(nonce[0]) | (uint32_t)(nonce[1]) << 8 | - (uint32_t)(nonce[2]) << 16 | (uint32_t)(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; -} - -int -aead_xchacha20_poly1305_seal(unsigned char key[32], unsigned char tag_len, - unsigned char *out, size_t *out_len, size_t max_out_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]; - unsigned char subkey[32]; - poly1305_state poly1305; - - if (max_out_len < in_len + tag_len) { - EVPerror(EVP_R_BUFFER_TOO_SMALL); - return 0; - } - - if (nonce_len != XCHACHA20_NONCE_LEN) { - EVPerror(EVP_R_IV_TOO_LARGE); - return 0; - } - - CRYPTO_hchacha_20(subkey, key, nonce); - - CRYPTO_chacha_20(out, in, in_len, subkey, nonce + 16, 1); - - memset(poly1305_key, 0, sizeof(poly1305_key)); - CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), - subkey, nonce + 16, 0); - - CRYPTO_poly1305_init(&poly1305, poly1305_key); - poly1305_update_with_pad16(&poly1305, ad, ad_len); - 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_xchacha20_poly1305_open(unsigned char key[32], unsigned char tag_len, - unsigned char *out, size_t *out_len, size_t max_out_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]; - unsigned char subkey[32]; - poly1305_state poly1305; - size_t plaintext_len; - - if (in_len < tag_len) { - EVPerror(EVP_R_BAD_DECRYPT); - return 0; - } - - if (nonce_len != XCHACHA20_NONCE_LEN) { - EVPerror(EVP_R_IV_TOO_LARGE); - return 0; - } - - plaintext_len = in_len - tag_len; - - if (max_out_len < plaintext_len) { - EVPerror(EVP_R_BUFFER_TOO_SMALL); - return 0; - } - - CRYPTO_hchacha_20(subkey, key, nonce); - - memset(poly1305_key, 0, sizeof(poly1305_key)); - CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), - subkey, nonce + 16, 0); - - 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, subkey, nonce + 16, 1); - - *out_len = plaintext_len; - return 1; -} - -#if 0 -/* RFC 7539 */ -static const EVP_AEAD aead_chacha20_poly1305 = { - .key_len = 32, - .nonce_len = CHACHA20_NONCE_LEN, - .overhead = POLY1305_TAG_LEN, - .max_tag_len = POLY1305_TAG_LEN, - - .init = aead_chacha20_poly1305_init, - .cleanup = aead_chacha20_poly1305_cleanup, - .seal = aead_chacha20_poly1305_seal, - .open = aead_chacha20_poly1305_open, -}; - -const EVP_AEAD * -EVP_aead_chacha20_poly1305() -{ - return &aead_chacha20_poly1305; -} - -static const EVP_AEAD aead_xchacha20_poly1305 = { - .key_len = 32, - .nonce_len = XCHACHA20_NONCE_LEN, - .overhead = POLY1305_TAG_LEN, - .max_tag_len = POLY1305_TAG_LEN, - - .init = aead_chacha20_poly1305_init, - .cleanup = aead_chacha20_poly1305_cleanup, - .seal = aead_xchacha20_poly1305_seal, - .open = aead_xchacha20_poly1305_open, -}; - -const EVP_AEAD * -EVP_aead_xchacha20_poly1305() -{ - return &aead_xchacha20_poly1305; -} -#endif - -#endif /* !OPENSSL_NO_CHACHA && !OPENSSL_NO_POLY1305 */ |