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Diffstat (limited to '')
| -rw-r--r-- | lib/isc/hash.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/lib/isc/hash.c b/lib/isc/hash.c new file mode 100644 index 0000000..522e140 --- /dev/null +++ b/lib/isc/hash.c @@ -0,0 +1,149 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +#include <inttypes.h> +#include <stdbool.h> +#include <stddef.h> + +#include "entropy_private.h" +#include "isc/hash.h" /* IWYU pragma: keep */ +#include "isc/once.h" +#include "isc/random.h" +#include "isc/result.h" +#include "isc/siphash.h" +#include "isc/string.h" +#include "isc/types.h" +#include "isc/util.h" + +static uint8_t isc_hash_key[16]; +static uint8_t isc_hash32_key[8]; +static bool hash_initialized = false; +static isc_once_t isc_hash_once = ISC_ONCE_INIT; + +static void +isc_hash_initialize(void) { + /* + * Set a constant key to help in problem reproduction should + * fuzzing find a crash or a hang. + */ + uint64_t key[2] = { 0, 1 }; +#if !FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + isc_entropy_get(key, sizeof(key)); +#endif /* if FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */ + memmove(isc_hash_key, key, sizeof(isc_hash_key)); +#if !FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION + isc_entropy_get(key, sizeof(key)); +#endif /* if FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */ + memmove(isc_hash32_key, key, sizeof(isc_hash32_key)); + hash_initialized = true; +} + +static uint8_t maptolower[] = { + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, + 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, + 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, + 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, + 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, + 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, + 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, + 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, + 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, + 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, + 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, + 0xfc, 0xfd, 0xfe, 0xff +}; + +const void * +isc_hash_get_initializer(void) { + if (!hash_initialized) { + RUNTIME_CHECK( + isc_once_do(&isc_hash_once, isc_hash_initialize) == + ISC_R_SUCCESS); + } + + return (isc_hash_key); +} + +void +isc_hash_set_initializer(const void *initializer) { + REQUIRE(initializer != NULL); + + /* + * Ensure that isc_hash_initialize() is not called after + * isc_hash_set_initializer() is called. + */ + if (!hash_initialized) { + RUNTIME_CHECK( + isc_once_do(&isc_hash_once, isc_hash_initialize) == + ISC_R_SUCCESS); + } + + memmove(isc_hash_key, initializer, sizeof(isc_hash_key)); +} + +uint64_t +isc_hash64(const void *data, const size_t length, const bool case_sensitive) { + uint64_t hval; + + REQUIRE(length == 0 || data != NULL); + + RUNTIME_CHECK(isc_once_do(&isc_hash_once, isc_hash_initialize) == + ISC_R_SUCCESS); + + if (case_sensitive) { + isc_siphash24(isc_hash_key, data, length, (uint8_t *)&hval); + } else { + uint8_t input[1024]; + REQUIRE(length <= 1024); + for (unsigned int i = 0; i < length; i++) { + input[i] = maptolower[((const uint8_t *)data)[i]]; + } + isc_siphash24(isc_hash_key, input, length, (uint8_t *)&hval); + } + + return (hval); +} + +uint32_t +isc_hash32(const void *data, const size_t length, const bool case_sensitive) { + uint32_t hval; + + REQUIRE(length == 0 || data != NULL); + + RUNTIME_CHECK(isc_once_do(&isc_hash_once, isc_hash_initialize) == + ISC_R_SUCCESS); + + if (case_sensitive) { + isc_halfsiphash24(isc_hash_key, data, length, (uint8_t *)&hval); + } else { + uint8_t input[1024]; + REQUIRE(length <= 1024); + for (unsigned int i = 0; i < length; i++) { + input[i] = maptolower[((const uint8_t *)data)[i]]; + } + isc_halfsiphash24(isc_hash_key, input, length, + (uint8_t *)&hval); + } + + return (hval); +} |