Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2018, Google Inc. |
| 2 | * |
| 3 | * Permission to use, copy, modify, and/or distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 10 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 12 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 13 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| 14 | |
| 15 | #include <openssl/aead.h> |
| 16 | |
| 17 | #include <assert.h> |
| 18 | |
| 19 | #include <openssl/cipher.h> |
| 20 | #include <openssl/err.h> |
| 21 | #include <openssl/mem.h> |
| 22 | |
| 23 | #include "../fipsmodule/cipher/internal.h" |
| 24 | |
| 25 | |
| 26 | #define EVP_AEAD_AES_CCM_MAX_TAG_LEN 16 |
| 27 | |
| 28 | struct aead_aes_ccm_ctx { |
| 29 | union { |
| 30 | double align; |
| 31 | AES_KEY ks; |
| 32 | } ks; |
| 33 | CCM128_CONTEXT ccm; |
| 34 | }; |
| 35 | |
Robert Sloan | 5bdaadb | 2018-10-30 16:00:26 -0700 | [diff] [blame^] | 36 | OPENSSL_COMPILE_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >= |
| 37 | sizeof(struct aead_aes_ccm_ctx), |
| 38 | AEAD_state_too_small); |
| 39 | #if defined(__GNUC__) || defined(__clang__) |
| 40 | OPENSSL_COMPILE_ASSERT(alignof(union evp_aead_ctx_st_state) >= |
| 41 | alignof(struct aead_aes_ccm_ctx), |
| 42 | AEAD_state_insufficient_alignment); |
| 43 | #endif |
| 44 | |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 45 | static int aead_aes_ccm_init(EVP_AEAD_CTX *ctx, const uint8_t *key, |
| 46 | size_t key_len, size_t tag_len, unsigned M, |
| 47 | unsigned L) { |
| 48 | assert(M == EVP_AEAD_max_overhead(ctx->aead)); |
| 49 | assert(M == EVP_AEAD_max_tag_len(ctx->aead)); |
| 50 | assert(15 - L == EVP_AEAD_nonce_length(ctx->aead)); |
| 51 | |
| 52 | if (key_len != EVP_AEAD_key_length(ctx->aead)) { |
| 53 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH); |
| 54 | return 0; // EVP_AEAD_CTX_init should catch this. |
| 55 | } |
| 56 | |
| 57 | if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { |
| 58 | tag_len = M; |
| 59 | } |
| 60 | |
| 61 | if (tag_len != M) { |
| 62 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE); |
| 63 | return 0; |
| 64 | } |
| 65 | |
Robert Sloan | 5bdaadb | 2018-10-30 16:00:26 -0700 | [diff] [blame^] | 66 | struct aead_aes_ccm_ctx *ccm_ctx = (struct aead_aes_ccm_ctx *)&ctx->state; |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 67 | |
| 68 | block128_f block; |
| 69 | ctr128_f ctr = aes_ctr_set_key(&ccm_ctx->ks.ks, NULL, &block, key, key_len); |
| 70 | ctx->tag_len = tag_len; |
| 71 | if (!CRYPTO_ccm128_init(&ccm_ctx->ccm, &ccm_ctx->ks.ks, block, ctr, M, L)) { |
| 72 | OPENSSL_PUT_ERROR(CIPHER, ERR_R_INTERNAL_ERROR); |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 73 | return 0; |
| 74 | } |
| 75 | |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 76 | return 1; |
| 77 | } |
| 78 | |
Robert Sloan | 5bdaadb | 2018-10-30 16:00:26 -0700 | [diff] [blame^] | 79 | static void aead_aes_ccm_cleanup(EVP_AEAD_CTX *ctx) {} |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 80 | |
| 81 | static int aead_aes_ccm_seal_scatter( |
| 82 | const EVP_AEAD_CTX *ctx, uint8_t *out, uint8_t *out_tag, |
| 83 | size_t *out_tag_len, size_t max_out_tag_len, const uint8_t *nonce, |
| 84 | size_t nonce_len, const uint8_t *in, size_t in_len, const uint8_t *extra_in, |
| 85 | size_t extra_in_len, const uint8_t *ad, size_t ad_len) { |
Robert Sloan | 5bdaadb | 2018-10-30 16:00:26 -0700 | [diff] [blame^] | 86 | const struct aead_aes_ccm_ctx *ccm_ctx = |
| 87 | (struct aead_aes_ccm_ctx *)&ctx->state; |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 88 | |
| 89 | if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) { |
| 90 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE); |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | if (max_out_tag_len < ctx->tag_len) { |
| 95 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) { |
| 100 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | if (!CRYPTO_ccm128_encrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, out_tag, |
| 105 | ctx->tag_len, nonce, nonce_len, in, in_len, ad, |
| 106 | ad_len)) { |
| 107 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | *out_tag_len = ctx->tag_len; |
| 112 | return 1; |
| 113 | } |
| 114 | |
| 115 | static int aead_aes_ccm_open_gather(const EVP_AEAD_CTX *ctx, uint8_t *out, |
| 116 | const uint8_t *nonce, size_t nonce_len, |
| 117 | const uint8_t *in, size_t in_len, |
| 118 | const uint8_t *in_tag, size_t in_tag_len, |
| 119 | const uint8_t *ad, size_t ad_len) { |
Robert Sloan | 5bdaadb | 2018-10-30 16:00:26 -0700 | [diff] [blame^] | 120 | const struct aead_aes_ccm_ctx *ccm_ctx = |
| 121 | (struct aead_aes_ccm_ctx *)&ctx->state; |
Robert Sloan | ab8b888 | 2018-03-26 11:39:51 -0700 | [diff] [blame] | 122 | |
| 123 | if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) { |
| 124 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE); |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) { |
| 129 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE); |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | if (in_tag_len != ctx->tag_len) { |
| 134 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | uint8_t tag[EVP_AEAD_AES_CCM_MAX_TAG_LEN]; |
| 139 | assert(ctx->tag_len <= EVP_AEAD_AES_CCM_MAX_TAG_LEN); |
| 140 | if (!CRYPTO_ccm128_decrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, tag, |
| 141 | ctx->tag_len, nonce, nonce_len, in, in_len, ad, |
| 142 | ad_len)) { |
| 143 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE); |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | if (CRYPTO_memcmp(tag, in_tag, ctx->tag_len) != 0) { |
| 148 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT); |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | return 1; |
| 153 | } |
| 154 | |
| 155 | static int aead_aes_ccm_bluetooth_init(EVP_AEAD_CTX *ctx, const uint8_t *key, |
| 156 | size_t key_len, size_t tag_len) { |
| 157 | return aead_aes_ccm_init(ctx, key, key_len, tag_len, 4, 2); |
| 158 | } |
| 159 | |
| 160 | static const EVP_AEAD aead_aes_128_ccm_bluetooth = { |
| 161 | 16, // key length (AES-128) |
| 162 | 13, // nonce length |
| 163 | 4, // overhead |
| 164 | 4, // max tag length |
| 165 | 0, // seal_scatter_supports_extra_in |
| 166 | |
| 167 | aead_aes_ccm_bluetooth_init, |
| 168 | NULL /* init_with_direction */, |
| 169 | aead_aes_ccm_cleanup, |
| 170 | NULL /* open */, |
| 171 | aead_aes_ccm_seal_scatter, |
| 172 | aead_aes_ccm_open_gather, |
| 173 | NULL /* get_iv */, |
| 174 | NULL /* tag_len */, |
| 175 | }; |
| 176 | |
| 177 | const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth(void) { |
| 178 | return &aead_aes_128_ccm_bluetooth; |
| 179 | } |
| 180 | |
| 181 | static int aead_aes_ccm_bluetooth_8_init(EVP_AEAD_CTX *ctx, const uint8_t *key, |
| 182 | size_t key_len, size_t tag_len) { |
| 183 | return aead_aes_ccm_init(ctx, key, key_len, tag_len, 8, 2); |
| 184 | } |
| 185 | |
| 186 | static const EVP_AEAD aead_aes_128_ccm_bluetooth_8 = { |
| 187 | 16, // key length (AES-128) |
| 188 | 13, // nonce length |
| 189 | 8, // overhead |
| 190 | 8, // max tag length |
| 191 | 0, // seal_scatter_supports_extra_in |
| 192 | |
| 193 | aead_aes_ccm_bluetooth_8_init, |
| 194 | NULL /* init_with_direction */, |
| 195 | aead_aes_ccm_cleanup, |
| 196 | NULL /* open */, |
| 197 | aead_aes_ccm_seal_scatter, |
| 198 | aead_aes_ccm_open_gather, |
| 199 | NULL /* get_iv */, |
| 200 | NULL /* tag_len */, |
| 201 | }; |
| 202 | |
| 203 | const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth_8(void) { |
| 204 | return &aead_aes_128_ccm_bluetooth_8; |
| 205 | } |