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| 1 /* ==================================================================== | |
| 2 * Copyright (c) 2013 The OpenSSL Project. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in | |
| 13 * the documentation and/or other materials provided with the | |
| 14 * distribution. | |
| 15 * | |
| 16 * 3. All advertising materials mentioning features or use of this | |
| 17 * software must display the following acknowledgment: | |
| 18 * "This product includes software developed by the OpenSSL Project | |
| 19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
| 20 * | |
| 21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
| 22 * endorse or promote products derived from this software without | |
| 23 * prior written permission. For written permission, please contact | |
| 24 * openssl-core@openssl.org. | |
| 25 * | |
| 26 * 5. Products derived from this software may not be called "OpenSSL" | |
| 27 * nor may "OpenSSL" appear in their names without prior written | |
| 28 * permission of the OpenSSL Project. | |
| 29 * | |
| 30 * 6. Redistributions of any form whatsoever must retain the following | |
| 31 * acknowledgment: | |
| 32 * "This product includes software developed by the OpenSSL Project | |
| 33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
| 34 * | |
| 35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
| 36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
| 39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 46 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 47 * ==================================================================== | |
| 48 * | |
| 49 */ | |
| 50 | |
| 51 #include <stdint.h> | |
| 52 #include <string.h> | |
| 53 #include <openssl/opensslconf.h> | |
| 54 | |
| 55 #if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305) | |
| 56 | |
| 57 #include <openssl/chacha.h> | |
| 58 #include <openssl/poly1305.h> | |
| 59 #include <openssl/evp.h> | |
| 60 #include <openssl/err.h> | |
| 61 #include "evp_locl.h" | |
| 62 | |
| 63 #define POLY1305_TAG_LEN 16 | |
| 64 #define CHACHA20_NONCE_LEN 8 | |
| 65 | |
| 66 struct aead_chacha20_poly1305_ctx | |
| 67 { | |
| 68 unsigned char key[32]; | |
| 69 unsigned char tag_len; | |
| 70 }; | |
| 71 | |
| 72 static int aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const unsigned char *k
ey, size_t key_len, size_t tag_len) | |
| 73 { | |
| 74 struct aead_chacha20_poly1305_ctx *c20_ctx; | |
| 75 | |
| 76 if (tag_len == 0) | |
| 77 tag_len = POLY1305_TAG_LEN; | |
| 78 | |
| 79 if (tag_len > POLY1305_TAG_LEN) | |
| 80 { | |
| 81 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_INIT, EVP_R_TOO_LARGE); | |
| 82 return 0; | |
| 83 } | |
| 84 | |
| 85 if (key_len != sizeof(c20_ctx->key)) | |
| 86 return 0; /* internal error - EVP_AEAD_CTX_init should catch th
is. */ | |
| 87 | |
| 88 c20_ctx = OPENSSL_malloc(sizeof(struct aead_chacha20_poly1305_ctx)); | |
| 89 if (c20_ctx == NULL) | |
| 90 return 0; | |
| 91 | |
| 92 memcpy(&c20_ctx->key[0], key, key_len); | |
| 93 c20_ctx->tag_len = tag_len; | |
| 94 ctx->aead_state = c20_ctx; | |
| 95 | |
| 96 return 1; | |
| 97 } | |
| 98 | |
| 99 static void aead_chacha20_poly1305_cleanup(EVP_AEAD_CTX *ctx) | |
| 100 { | |
| 101 struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state; | |
| 102 OPENSSL_cleanse(c20_ctx->key, sizeof(c20_ctx->key)); | |
| 103 OPENSSL_free(c20_ctx); | |
| 104 } | |
| 105 | |
| 106 static void poly1305_update_with_length(poly1305_state *poly1305, | |
| 107 const unsigned char *data, size_t data_len) | |
| 108 { | |
| 109 size_t j = data_len; | |
| 110 unsigned char length_bytes[8]; | |
| 111 unsigned i; | |
| 112 | |
| 113 for (i = 0; i < sizeof(length_bytes); i++) | |
| 114 { | |
| 115 length_bytes[i] = j; | |
| 116 j >>= 8; | |
| 117 } | |
| 118 | |
| 119 CRYPTO_poly1305_update(poly1305, data, data_len); | |
| 120 CRYPTO_poly1305_update(poly1305, length_bytes, sizeof(length_bytes)); | |
| 121 } | |
| 122 | |
| 123 #if __arm__ | |
| 124 #define ALIGNED __attribute__((aligned(16))) | |
| 125 #else | |
| 126 #define ALIGNED | |
| 127 #endif | |
| 128 | |
| 129 static ssize_t aead_chacha20_poly1305_seal(const EVP_AEAD_CTX *ctx, | |
| 130 unsigned char *out, size_t max_out_len, | |
| 131 const unsigned char *nonce, size_t nonce_len, | |
| 132 const unsigned char *in, size_t in_len, | |
| 133 const unsigned char *ad, size_t ad_len) | |
| 134 { | |
| 135 const struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state; | |
| 136 unsigned char poly1305_key[32] ALIGNED; | |
| 137 poly1305_state poly1305; | |
| 138 const uint64_t in_len_64 = in_len; | |
| 139 | |
| 140 /* The underlying ChaCha implementation may not overflow the block | |
| 141 * counter into the second counter word. Therefore we disallow | |
| 142 * individual operations that work on more than 2TB at a time. | |
| 143 * |in_len_64| is needed because, on 32-bit platforms, size_t is only | |
| 144 * 32-bits and this produces a warning because it's always false. | |
| 145 * Casting to uint64_t inside the conditional is not sufficient to stop | |
| 146 * the warning. */ | |
| 147 if (in_len_64 >= (1ull << 32)*64-64) | |
| 148 { | |
| 149 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_TOO_LARGE); | |
| 150 return -1; | |
| 151 } | |
| 152 | |
| 153 if (max_out_len < in_len + c20_ctx->tag_len) | |
| 154 { | |
| 155 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_BUFFER_TOO_SMALL
); | |
| 156 return -1; | |
| 157 } | |
| 158 | |
| 159 if (nonce_len != CHACHA20_NONCE_LEN) | |
| 160 { | |
| 161 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_IV_TOO_LARGE); | |
| 162 return -1; | |
| 163 } | |
| 164 | |
| 165 memset(poly1305_key, 0, sizeof(poly1305_key)); | |
| 166 CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), c20_c
tx->key, nonce, 0); | |
| 167 | |
| 168 CRYPTO_poly1305_init(&poly1305, poly1305_key); | |
| 169 poly1305_update_with_length(&poly1305, ad, ad_len); | |
| 170 CRYPTO_chacha_20(out, in, in_len, c20_ctx->key, nonce, 1); | |
| 171 poly1305_update_with_length(&poly1305, out, in_len); | |
| 172 | |
| 173 if (c20_ctx->tag_len != POLY1305_TAG_LEN) | |
| 174 { | |
| 175 unsigned char tag[POLY1305_TAG_LEN]; | |
| 176 CRYPTO_poly1305_finish(&poly1305, tag); | |
| 177 memcpy(out + in_len, tag, c20_ctx->tag_len); | |
| 178 return in_len + c20_ctx->tag_len; | |
| 179 } | |
| 180 | |
| 181 CRYPTO_poly1305_finish(&poly1305, out + in_len); | |
| 182 return in_len + POLY1305_TAG_LEN; | |
| 183 } | |
| 184 | |
| 185 static ssize_t aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx, | |
| 186 unsigned char *out, size_t max_out_len, | |
| 187 const unsigned char *nonce, size_t nonce_len, | |
| 188 const unsigned char *in, size_t in_len, | |
| 189 const unsigned char *ad, size_t ad_len) | |
| 190 { | |
| 191 const struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state; | |
| 192 unsigned char mac[POLY1305_TAG_LEN]; | |
| 193 unsigned char poly1305_key[32] ALIGNED; | |
| 194 size_t out_len; | |
| 195 poly1305_state poly1305; | |
| 196 const uint64_t in_len_64 = in_len; | |
| 197 | |
| 198 if (in_len < c20_ctx->tag_len) | |
| 199 { | |
| 200 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BAD_DECRYPT); | |
| 201 return -1; | |
| 202 } | |
| 203 | |
| 204 /* The underlying ChaCha implementation may not overflow the block | |
| 205 * counter into the second counter word. Therefore we disallow | |
| 206 * individual operations that work on more than 2TB at a time. | |
| 207 * |in_len_64| is needed because, on 32-bit platforms, size_t is only | |
| 208 * 32-bits and this produces a warning because it's always false. | |
| 209 * Casting to uint64_t inside the conditional is not sufficient to stop | |
| 210 * the warning. */ | |
| 211 if (in_len_64 >= (1ull << 32)*64-64) | |
| 212 { | |
| 213 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_TOO_LARGE); | |
| 214 return -1; | |
| 215 } | |
| 216 | |
| 217 if (nonce_len != CHACHA20_NONCE_LEN) | |
| 218 { | |
| 219 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_IV_TOO_LARGE); | |
| 220 return -1; | |
| 221 } | |
| 222 | |
| 223 out_len = in_len - c20_ctx->tag_len; | |
| 224 | |
| 225 if (max_out_len < out_len) | |
| 226 { | |
| 227 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BUFFER_TOO_SMALL
); | |
| 228 return -1; | |
| 229 } | |
| 230 | |
| 231 memset(poly1305_key, 0, sizeof(poly1305_key)); | |
| 232 CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), c20_c
tx->key, nonce, 0); | |
| 233 | |
| 234 CRYPTO_poly1305_init(&poly1305, poly1305_key); | |
| 235 poly1305_update_with_length(&poly1305, ad, ad_len); | |
| 236 poly1305_update_with_length(&poly1305, in, out_len); | |
| 237 CRYPTO_poly1305_finish(&poly1305, mac); | |
| 238 | |
| 239 if (CRYPTO_memcmp(mac, in + out_len, c20_ctx->tag_len) != 0) | |
| 240 { | |
| 241 EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BAD_DECRYPT); | |
| 242 return -1; | |
| 243 } | |
| 244 | |
| 245 CRYPTO_chacha_20(out, in, out_len, c20_ctx->key, nonce, 1); | |
| 246 return out_len; | |
| 247 } | |
| 248 | |
| 249 static const EVP_AEAD aead_chacha20_poly1305 = | |
| 250 { | |
| 251 32, /* key len */ | |
| 252 CHACHA20_NONCE_LEN, /* nonce len */ | |
| 253 POLY1305_TAG_LEN, /* overhead */ | |
| 254 POLY1305_TAG_LEN, /* max tag length */ | |
| 255 | |
| 256 aead_chacha20_poly1305_init, | |
| 257 aead_chacha20_poly1305_cleanup, | |
| 258 aead_chacha20_poly1305_seal, | |
| 259 aead_chacha20_poly1305_open, | |
| 260 }; | |
| 261 | |
| 262 const EVP_AEAD *EVP_aead_chacha20_poly1305() | |
| 263 { | |
| 264 return &aead_chacha20_poly1305; | |
| 265 } | |
| 266 | |
| 267 #endif /* !OPENSSL_NO_CHACHA && !OPENSSL_NO_POLY1305 */ | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master