| 1 | /* |
| 2 | * QEMU Crypto af_alg-backend hash/hmac support |
| 3 | * |
| 4 | * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates |
| 5 | * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD. |
| 6 | * |
| 7 | * Authors: |
| 8 | * Longpeng(Mike) <longpeng2@huawei.com> |
| 9 | * |
| 10 | * This work is licensed under the terms of the GNU GPL, version 2 or |
| 11 | * (at your option) any later version. See the COPYING file in the |
| 12 | * top-level directory. |
| 13 | */ |
| 14 | #include "qemu/osdep.h" |
| 15 | #include "qemu/iov.h" |
| 16 | #include "qemu/sockets.h" |
| 17 | #include "qapi/error.h" |
| 18 | #include "crypto/hash.h" |
| 19 | #include "crypto/hmac.h" |
| 20 | #include "hashpriv.h" |
| 21 | #include "hmacpriv.h" |
| 22 | |
| 23 | static char * |
| 24 | qcrypto_afalg_hash_format_name(QCryptoHashAlgo alg, |
| 25 | bool is_hmac, |
| 26 | Error **errp) |
| 27 | { |
| 28 | char *name; |
| 29 | const char *alg_name; |
| 30 | |
| 31 | switch (alg) { |
| 32 | case QCRYPTO_HASH_ALGO_MD5: |
| 33 | alg_name = "md5"; |
| 34 | break; |
| 35 | case QCRYPTO_HASH_ALGO_SHA1: |
| 36 | alg_name = "sha1"; |
| 37 | break; |
| 38 | case QCRYPTO_HASH_ALGO_SHA224: |
| 39 | alg_name = "sha224"; |
| 40 | break; |
| 41 | case QCRYPTO_HASH_ALGO_SHA256: |
| 42 | alg_name = "sha256"; |
| 43 | break; |
| 44 | case QCRYPTO_HASH_ALGO_SHA384: |
| 45 | alg_name = "sha384"; |
| 46 | break; |
| 47 | case QCRYPTO_HASH_ALGO_SHA512: |
| 48 | alg_name = "sha512"; |
| 49 | break; |
| 50 | case QCRYPTO_HASH_ALGO_RIPEMD160: |
| 51 | alg_name = "rmd160"; |
| 52 | break; |
| 53 | |
| 54 | default: |
| 55 | error_setg(errp, "Unsupported hash algorithm %d", alg); |
| 56 | return NULL; |
| 57 | } |
| 58 | |
| 59 | if (is_hmac) { |
| 60 | name = g_strdup_printf("hmac(%s)", alg_name); |
| 61 | } else { |
| 62 | name = g_strdup(alg_name); |
| 63 | } |
| 64 | |
| 65 | return name; |
| 66 | } |
| 67 | |
| 68 | static QCryptoAFAlgo * |
| 69 | qcrypto_afalg_hash_hmac_ctx_new(QCryptoHashAlgo alg, |
| 70 | const uint8_t *key, size_t nkey, |
| 71 | bool is_hmac, Error **errp) |
| 72 | { |
| 73 | QCryptoAFAlgo *afalg; |
| 74 | char *name; |
| 75 | |
| 76 | name = qcrypto_afalg_hash_format_name(alg, is_hmac, errp); |
| 77 | if (!name) { |
| 78 | return NULL; |
| 79 | } |
| 80 | |
| 81 | afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_HASH, name, errp); |
| 82 | if (!afalg) { |
| 83 | g_free(name); |
| 84 | return NULL; |
| 85 | } |
| 86 | |
| 87 | g_free(name); |
| 88 | |
| 89 | /* HMAC needs setkey */ |
| 90 | if (is_hmac) { |
| 91 | if (setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY, |
| 92 | key, nkey) != 0) { |
| 93 | error_setg_errno(errp, errno, "Set hmac key failed"); |
| 94 | qcrypto_afalg_comm_free(afalg); |
| 95 | return NULL; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | return afalg; |
| 100 | } |
| 101 | |
| 102 | static QCryptoAFAlgo * |
| 103 | qcrypto_afalg_hash_ctx_new(QCryptoHashAlgo alg, |
| 104 | Error **errp) |
| 105 | { |
| 106 | return qcrypto_afalg_hash_hmac_ctx_new(alg, NULL, 0, false, errp); |
| 107 | } |
| 108 | |
| 109 | QCryptoAFAlgo * |
| 110 | qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgo alg, |
| 111 | const uint8_t *key, size_t nkey, |
| 112 | Error **errp) |
| 113 | { |
| 114 | return qcrypto_afalg_hash_hmac_ctx_new(alg, key, nkey, true, errp); |
| 115 | } |
| 116 | |
| 117 | static |
| 118 | QCryptoHash *qcrypto_afalg_hash_new(QCryptoHashAlgo alg, Error **errp) |
| 119 | { |
| 120 | /* Check if hash algorithm is supported */ |
| 121 | char *alg_name = qcrypto_afalg_hash_format_name(alg, false, NULL); |
| 122 | QCryptoHash *hash; |
| 123 | |
| 124 | if (alg_name == NULL) { |
| 125 | error_setg(errp, "Unknown hash algorithm %d", alg); |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | g_free(alg_name); |
| 130 | |
| 131 | hash = g_new(QCryptoHash, 1); |
| 132 | hash->alg = alg; |
| 133 | hash->opaque = qcrypto_afalg_hash_ctx_new(alg, errp); |
| 134 | if (!hash->opaque) { |
| 135 | free(hash); |
| 136 | return NULL; |
| 137 | } |
| 138 | |
| 139 | return hash; |
| 140 | } |
| 141 | |
| 142 | static |
| 143 | void qcrypto_afalg_hash_free(QCryptoHash *hash) |
| 144 | { |
| 145 | QCryptoAFAlgo *ctx = hash->opaque; |
| 146 | |
| 147 | if (ctx) { |
| 148 | qcrypto_afalg_comm_free(ctx); |
| 149 | } |
| 150 | |
| 151 | g_free(hash); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Send data to the kernel's crypto core. |
| 156 | * |
| 157 | * The more_data parameter is used to notify the crypto engine |
| 158 | * that this is an "update" operation, and that more data will |
| 159 | * be provided to calculate the final hash. |
| 160 | */ |
| 161 | static |
| 162 | int qcrypto_afalg_send_to_kernel(QCryptoAFAlgo *afalg, |
| 163 | const struct iovec *iov, |
| 164 | size_t niov, |
| 165 | bool more_data, |
| 166 | Error **errp) |
| 167 | { |
| 168 | int ret = 0; |
| 169 | int flags = (more_data ? MSG_MORE : 0); |
| 170 | |
| 171 | /* send data to kernel's crypto core */ |
| 172 | ret = iov_send_recv_with_flags(afalg->opfd, flags, iov, niov, |
| 173 | 0, iov_size(iov, niov), true); |
| 174 | if (ret < 0) { |
| 175 | error_setg_errno(errp, errno, "Send data to afalg-core failed"); |
| 176 | ret = -1; |
| 177 | } else { |
| 178 | /* No error, so return 0 */ |
| 179 | ret = 0; |
| 180 | } |
| 181 | |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static |
| 186 | int qcrypto_afalg_recv_from_kernel(QCryptoAFAlgo *afalg, |
| 187 | QCryptoHashAlgo alg, |
| 188 | uint8_t **result, |
| 189 | size_t *result_len, |
| 190 | Error **errp) |
| 191 | { |
| 192 | struct iovec outv; |
| 193 | int ret; |
| 194 | const int expected_len = qcrypto_hash_digest_len(alg); |
| 195 | |
| 196 | if (*result_len == 0) { |
| 197 | *result_len = expected_len; |
| 198 | *result = g_new0(uint8_t, *result_len); |
| 199 | } else if (*result_len != expected_len) { |
| 200 | error_setg(errp, |
| 201 | "Result buffer size %zu is not match hash %d", |
| 202 | *result_len, expected_len); |
| 203 | return -1; |
| 204 | } |
| 205 | |
| 206 | /* hash && get result */ |
| 207 | outv.iov_base = *result; |
| 208 | outv.iov_len = *result_len; |
| 209 | ret = iov_send_recv(afalg->opfd, &outv, 1, |
| 210 | 0, iov_size(&outv, 1), false); |
| 211 | if (ret < 0) { |
| 212 | error_setg_errno(errp, errno, "Recv result from afalg-core failed"); |
| 213 | return -1; |
| 214 | } |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static |
| 220 | int qcrypto_afalg_hash_update(QCryptoHash *hash, |
| 221 | const struct iovec *iov, |
| 222 | size_t niov, |
| 223 | Error **errp) |
| 224 | { |
| 225 | return qcrypto_afalg_send_to_kernel((QCryptoAFAlgo *) hash->opaque, |
| 226 | iov, niov, true, errp); |
| 227 | } |
| 228 | |
| 229 | static |
| 230 | int qcrypto_afalg_hash_finalize(QCryptoHash *hash, |
| 231 | uint8_t **result, |
| 232 | size_t *result_len, |
| 233 | Error **errp) |
| 234 | { |
| 235 | return qcrypto_afalg_recv_from_kernel((QCryptoAFAlgo *) hash->opaque, |
| 236 | hash->alg, result, result_len, errp); |
| 237 | } |
| 238 | |
| 239 | static int |
| 240 | qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlgo *hmac, |
| 241 | QCryptoHashAlgo alg, |
| 242 | const struct iovec *iov, |
| 243 | size_t niov, uint8_t **result, |
| 244 | size_t *resultlen, |
| 245 | Error **errp) |
| 246 | { |
| 247 | int ret = 0; |
| 248 | |
| 249 | ret = qcrypto_afalg_send_to_kernel(hmac, iov, niov, false, errp); |
| 250 | if (ret == 0) { |
| 251 | ret = qcrypto_afalg_recv_from_kernel(hmac, alg, result, |
| 252 | resultlen, errp); |
| 253 | } |
| 254 | |
| 255 | return ret; |
| 256 | } |
| 257 | |
| 258 | static int |
| 259 | qcrypto_afalg_hmac_bytesv(QCryptoHmac *hmac, |
| 260 | const struct iovec *iov, |
| 261 | size_t niov, uint8_t **result, |
| 262 | size_t *resultlen, |
| 263 | Error **errp) |
| 264 | { |
| 265 | return qcrypto_afalg_hash_hmac_bytesv(hmac->opaque, hmac->alg, |
| 266 | iov, niov, result, resultlen, |
| 267 | errp); |
| 268 | } |
| 269 | |
| 270 | static void qcrypto_afalg_hmac_ctx_free(QCryptoHmac *hmac) |
| 271 | { |
| 272 | QCryptoAFAlgo *afalg; |
| 273 | |
| 274 | afalg = hmac->opaque; |
| 275 | qcrypto_afalg_comm_free(afalg); |
| 276 | } |
| 277 | |
| 278 | QCryptoHashDriver qcrypto_hash_afalg_driver = { |
| 279 | .hash_new = qcrypto_afalg_hash_new, |
| 280 | .hash_free = qcrypto_afalg_hash_free, |
| 281 | .hash_update = qcrypto_afalg_hash_update, |
| 282 | .hash_finalize = qcrypto_afalg_hash_finalize |
| 283 | }; |
| 284 | |
| 285 | QCryptoHmacDriver qcrypto_hmac_afalg_driver = { |
| 286 | .hmac_bytesv = qcrypto_afalg_hmac_bytesv, |
| 287 | .hmac_free = qcrypto_afalg_hmac_ctx_free, |
| 288 | }; |