| OLD | NEW |
|---|
| (Empty) |
| 1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
| 2 * All rights reserved. | |
| 3 * | |
| 4 * This package is an SSL implementation written | |
| 5 * by Eric Young (eay@cryptsoft.com). | |
| 6 * The implementation was written so as to conform with Netscapes SSL. | |
| 7 * | |
| 8 * This library is free for commercial and non-commercial use as long as | |
| 9 * the following conditions are aheared to. The following conditions | |
| 10 * apply to all code found in this distribution, be it the RC4, RSA, | |
| 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
| 12 * included with this distribution is covered by the same copyright terms | |
| 13 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
| 14 * | |
| 15 * Copyright remains Eric Young's, and as such any Copyright notices in | |
| 16 * the code are not to be removed. | |
| 17 * If this package is used in a product, Eric Young should be given attribution | |
| 18 * as the author of the parts of the library used. | |
| 19 * This can be in the form of a textual message at program startup or | |
| 20 * in documentation (online or textual) provided with the package. | |
| 21 * | |
| 22 * Redistribution and use in source and binary forms, with or without | |
| 23 * modification, are permitted provided that the following conditions | |
| 24 * are met: | |
| 25 * 1. Redistributions of source code must retain the copyright | |
| 26 * notice, this list of conditions and the following disclaimer. | |
| 27 * 2. Redistributions in binary form must reproduce the above copyright | |
| 28 * notice, this list of conditions and the following disclaimer in the | |
| 29 * documentation and/or other materials provided with the distribution. | |
| 30 * 3. All advertising materials mentioning features or use of this software | |
| 31 * must display the following acknowledgement: | |
| 32 * "This product includes cryptographic software written by | |
| 33 * Eric Young (eay@cryptsoft.com)" | |
| 34 * The word 'cryptographic' can be left out if the rouines from the library | |
| 35 * being used are not cryptographic related :-). | |
| 36 * 4. If you include any Windows specific code (or a derivative thereof) from | |
| 37 * the apps directory (application code) you must include an acknowledgement: | |
| 38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
| 39 * | |
| 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
| 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 50 * SUCH DAMAGE. | |
| 51 * | |
| 52 * The licence and distribution terms for any publically available version or | |
| 53 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
| 54 * copied and put under another distribution licence | |
| 55 * [including the GNU Public Licence.] | |
| 56 */ | |
| 57 | |
| 58 #include <limits.h> | |
| 59 #include <string.h> | |
| 60 | |
| 61 #include <openssl/evp.h> | |
| 62 #include <openssl/err.h> | |
| 63 | |
| 64 #include "evp_locl.h" | |
| 65 | |
| 66 size_t EVP_AEAD_key_length(const EVP_AEAD *aead) | |
| 67 { | |
| 68 return aead->key_len; | |
| 69 } | |
| 70 | |
| 71 size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead) | |
| 72 { | |
| 73 return aead->nonce_len; | |
| 74 } | |
| 75 | |
| 76 size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead) | |
| 77 { | |
| 78 return aead->overhead; | |
| 79 } | |
| 80 | |
| 81 size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead) | |
| 82 { | |
| 83 return aead->max_tag_len; | |
| 84 } | |
| 85 | |
| 86 int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead, | |
| 87 const unsigned char *key, size_t key_len, | |
| 88 size_t tag_len, ENGINE *impl) | |
| 89 { | |
| 90 ctx->aead = aead; | |
| 91 if (key_len != aead->key_len) | |
| 92 { | |
| 93 EVPerr(EVP_F_EVP_AEAD_CTX_INIT,EVP_R_UNSUPPORTED_KEY_SIZE); | |
| 94 return 0; | |
| 95 } | |
| 96 return aead->init(ctx, key, key_len, tag_len); | |
| 97 } | |
| 98 | |
| 99 void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx) | |
| 100 { | |
| 101 if (ctx->aead == NULL) | |
| 102 return; | |
| 103 ctx->aead->cleanup(ctx); | |
| 104 ctx->aead = NULL; | |
| 105 } | |
| 106 | |
| 107 /* check_alias returns 0 if |out| points within the buffer determined by |in| | |
| 108 * and |in_len| and 1 otherwise. | |
| 109 * | |
| 110 * When processing, there's only an issue if |out| points within in[:in_len] | |
| 111 * and isn't equal to |in|. If that's the case then writing the output will | |
| 112 * stomp input that hasn't been read yet. | |
| 113 * | |
| 114 * This function checks for that case. */ | |
| 115 static int check_alias(const unsigned char *in, size_t in_len, | |
| 116 const unsigned char *out) | |
| 117 { | |
| 118 if (out <= in) | |
| 119 return 1; | |
| 120 if (in + in_len <= out) | |
| 121 return 1; | |
| 122 return 0; | |
| 123 } | |
| 124 | |
| 125 ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, | |
| 126 unsigned char *out, size_t max_out_len, | |
| 127 const unsigned char *nonce, size_t nonce_len, | |
| 128 const unsigned char *in, size_t in_len, | |
| 129 const unsigned char *ad, size_t ad_len) | |
| 130 { | |
| 131 size_t possible_out_len = in_len + ctx->aead->overhead; | |
| 132 ssize_t r; | |
| 133 | |
| 134 if (possible_out_len < in_len /* overflow */ || | |
| 135 possible_out_len > SSIZE_MAX /* return value cannot be | |
| 136 represented */) | |
| 137 { | |
| 138 EVPerr(EVP_F_AEAD_CTX_SEAL, EVP_R_TOO_LARGE); | |
| 139 goto error; | |
| 140 } | |
| 141 | |
| 142 if (!check_alias(in, in_len, out)) | |
| 143 { | |
| 144 EVPerr(EVP_F_AEAD_CTX_SEAL, EVP_R_OUTPUT_ALIASES_INPUT); | |
| 145 goto error; | |
| 146 } | |
| 147 | |
| 148 r = ctx->aead->seal(ctx, out, max_out_len, nonce, nonce_len, | |
| 149 in, in_len, ad, ad_len); | |
| 150 if (r >= 0) | |
| 151 return r; | |
| 152 | |
| 153 error: | |
| 154 /* In the event of an error, clear the output buffer so that a caller | |
| 155 * that doesn't check the return value doesn't send raw data. */ | |
| 156 memset(out, 0, max_out_len); | |
| 157 return -1; | |
| 158 } | |
| 159 | |
| 160 ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, | |
| 161 unsigned char *out, size_t max_out_len, | |
| 162 const unsigned char *nonce, size_t nonce_len, | |
| 163 const unsigned char *in, size_t in_len, | |
| 164 const unsigned char *ad, size_t ad_len) | |
| 165 { | |
| 166 ssize_t r; | |
| 167 | |
| 168 if (in_len > SSIZE_MAX) | |
| 169 { | |
| 170 EVPerr(EVP_F_AEAD_CTX_OPEN, EVP_R_TOO_LARGE); | |
| 171 goto error; /* may not be able to represent return value. */ | |
| 172 } | |
| 173 | |
| 174 if (!check_alias(in, in_len, out)) | |
| 175 { | |
| 176 EVPerr(EVP_F_AEAD_CTX_OPEN, EVP_R_OUTPUT_ALIASES_INPUT); | |
| 177 goto error; | |
| 178 } | |
| 179 | |
| 180 r = ctx->aead->open(ctx, out, max_out_len, nonce, nonce_len, | |
| 181 in, in_len, ad, ad_len); | |
| 182 | |
| 183 if (r >= 0) | |
| 184 return r; | |
| 185 | |
| 186 error: | |
| 187 /* In the event of an error, clear the output buffer so that a caller | |
| 188 * that doesn't check the return value doesn't try and process bad | |
| 189 * data. */ | |
| 190 memset(out, 0, max_out_len); | |
| 191 return -1; | |
| 192 } | |
| OLD | NEW |
|---|
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