GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/crypto/hash.h
Date: 2025-07-13 02:35:07
Exec Total Coverage
Lines: 165 168 98.2%
Branches: 94 122 77.0%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * Provides a bit syntactic sugar around the hash algorithms.
5 * In particular, hashes can easily be created by constructors.
6 * Also, we have a little to-string-from-string conversion.
7 *
8 * The complexity is due to the need to avoid dynamically allocated memory
9 * for the hashes. Almost everything happens on the stack.
10 */
11
12 #ifndef CVMFS_CRYPTO_HASH_H_
13 #define CVMFS_CRYPTO_HASH_H_
14
15 #include <arpa/inet.h>
16 #include <stdint.h>
17
18 #include <cassert>
19 #include <cctype>
20 #include <cstdlib>
21 #include <cstring>
22 #include <string>
23
24 #include "util/export.h"
25 #include "util/logging.h"
26 #include "util/prng.h"
27 #include "util/smalloc.h"
28
29 #ifdef CVMFS_NAMESPACE_GUARD
30 namespace CVMFS_NAMESPACE_GUARD {
31 #endif
32
33 namespace shash {
34
35 /**
36 * Don't change order! The integer value of the enum constants is used
37 * as file catalog flags and as flags in communication with the cache manager.
38 * If algorithms are added, the protocol definition for external cache managers
39 * needs to be updated, too.
40 */
41 enum Algorithms {
42 kMd5 = 0,
43 kSha1,
44 kRmd160,
45 kShake128, // with 160 output bits
46 kAny,
47 };
48
49 /**
50 * NOTE: when adding a suffix here, one must edit `cvmfs_swissknife scrub`
51 * accordingly, that checks for invalid hash suffixes
52 */
53 const char kSuffixNone = 0;
54 const char kSuffixCatalog = 'C';
55 const char kSuffixHistory = 'H';
56 const char kSuffixMicroCatalog = 'L'; // currently unused
57 const char kSuffixPartial = 'P';
58 const char kSuffixTemporary = 'T';
59 const char kSuffixCertificate = 'X';
60 const char kSuffixMetainfo = 'M';
61
62
63 /**
64 * Corresponds to Algorithms. "Any" is the maximum of all the other
65 * digest sizes.
66 * When the maximum digest size changes, the memory layout of DirectoryEntry and
67 * PosixQuotaManager::LruCommand changes, too!
68 */
69 const unsigned kDigestSizes[] = {16, 20, 20, 20, 20};
70 // Md5 Sha1 Rmd160 Shake128 Any
71 const unsigned kMaxDigestSize = 20;
72
73 /**
74 * The maximum of GetContextSize()
75 */
76 const unsigned kMaxContextSize = 256;
77
78 /**
79 * Hex representations of hashes with the same length need a suffix
80 * to be distinguished from each other. They should all have one but
81 * for backwards compatibility MD5 and SHA-1 have none. Initialized in hash.cc
82 * like const char *kAlgorithmIds[] = {"", "", "-rmd160", ...
83 */
84 CVMFS_EXPORT extern const char *kAlgorithmIds[];
85 const unsigned kAlgorithmIdSizes[] = {0, 0, 7, 9, 0};
86 // Md5 Sha1 -rmd160 -shake128 Any
87 const unsigned kMaxAlgorithmIdentifierSize = 9;
88
89 /**
90 * Corresponds to Algorithms. There is no block size for Any.
91 * Is an HMAC for SHAKE well-defined?
92 */
93 const unsigned kBlockSizes[] = {64, 64, 64, 168};
94 // Md5 Sha1 Rmd160 Shake128
95
96 /**
97 * Distinguishes between interpreting a string as hex hash and hashing over
98 * the contents of a string.
99 */
100 struct CVMFS_EXPORT HexPtr {
101 const std::string *str;
102 599567 explicit HexPtr(const std::string &s) { str = &s; }
103 bool IsValid() const;
104 };
105
106 struct CVMFS_EXPORT AsciiPtr {
107 const std::string *str;
108 55864 explicit AsciiPtr(const std::string &s) { str = &s; }
109 };
110
111 typedef char Suffix;
112
113 /**
114 * Holds a hash digest and provides from string / to string conversion and
115 * comparison. The kAny algorithm may not be used in functions! The algorithm
116 * has to be changed beforehand.
117 * This class is not used directly, but used as base clase of Md5, Sha1, ...
118 */
119 template<unsigned digest_size_, Algorithms algorithm_>
120 struct CVMFS_EXPORT Digest {
121 unsigned char digest[digest_size_];
122 Algorithms algorithm;
123 Suffix suffix;
124
125 class Hex {
126 public:
127 18074746 explicit Hex(const Digest<digest_size_, algorithm_> *digest)
128 18074746 : digest_(*digest)
129 18074746 , hash_length_(2 * kDigestSizes[digest_.algorithm])
130 18074746 , algo_id_length_(kAlgorithmIdSizes[digest_.algorithm]) { }
131
132 1451537196 unsigned int length() const { return hash_length_ + algo_id_length_; }
133
134 710123538 char operator[](const unsigned int position) const {
135
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 710123538 assert(position < length());
136
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 712344101 return (position < hash_length_) ? GetHashChar(position)
137 710057356 : GetAlgorithmIdentifierChar(position);
138 }
139
140 protected:
141 718988931 char GetHashChar(const unsigned int position) const {
142
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 718988931 assert(position < hash_length_);
143
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 718988931 const char digit = (position % 2 == 0)
144 360273266 ? digest_.digest[position / 2] / 16
145 358715665 : digest_.digest[position / 2] % 16;
146 718988931 return ToHex(digit);
147 }
148
149 27910 char GetAlgorithmIdentifierChar(const unsigned int position) const {
150
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 27910 assert(position >= hash_length_);
151 27910 return kAlgorithmIds[digest_.algorithm][position - hash_length_];
152 }
153
154 709970098 char ToHex(const char c) const {
155
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 709970098 return static_cast<char>(c + ((c <= 9) ? '0' : 'a' - 10));
156 }
157
158 private:
159 const Digest<digest_size_, algorithm_> &digest_;
160 const unsigned int hash_length_;
161 const unsigned int algo_id_length_;
162 };
163
164 72416916 unsigned GetDigestSize() const { return kDigestSizes[algorithm]; }
165 1100 unsigned GetHexSize() const {
166 1100 return 2 * kDigestSizes[algorithm] + kAlgorithmIdSizes[algorithm];
167 }
168
169 795842734 Digest() : algorithm(algorithm_), suffix(kSuffixNone) { SetNull(); }
170
171 298920 explicit Digest(const Algorithms a, const HexPtr hex, const char s = 0)
172 298920 : algorithm(a), suffix(s) {
173
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 241 assert((algorithm_ == kAny) || (a == algorithm_));
174 298920 const unsigned char_size = 2 * kDigestSizes[a];
175
176 298920 const std::string *str = hex.str;
177 298920 const unsigned length = str->length();
178
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 298920 assert(length >= char_size); // A suffix won't hurt
179
180
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 6184628 for (unsigned i = 0; i < char_size; i += 2) {
181 10732658 this->digest[i / 2] = ((*str)[i] <= '9' ? (*str)[i] - '0'
182 1038758 : (*str)[i] - 'a' + 10)
183 * 16
184
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 12937975 + ((*str)[i + 1] <= '9' ? (*str)[i + 1] - '0'
185 1166559 : (*str)[i + 1] - 'a' + 10);
186 }
187 298920 }
188
189 11540 Digest(const Algorithms a,
190 const unsigned char *digest_buffer,
191 const Suffix s = kSuffixNone)
192 11540 : algorithm(a), suffix(s) {
193 11540 memcpy(digest, digest_buffer, kDigestSizes[a]);
194 11540 }
195
196 /**
197 * Generates a purely random hash
198 * Only used for testing purposes
199 */
200 4180 void Randomize() {
201 4180 Prng prng;
202 4180 prng.InitLocaltime();
203
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 4180 Randomize(&prng);
204 4180 }
205
206 /**
207 * Generates a purely random hash
208 * Only used for testing purposes
209 *
210 * @param seed random number generator seed (for reproducibility)
211 */
212 8004172 void Randomize(const uint64_t seed) {
213 8004172 Prng prng;
214 8004172 prng.InitSeed(seed);
215
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 8004172 Randomize(&prng);
216 8004172 }
217
218 /**
219 * Generates a purely random hash
220 * Only used for testing purposes
221 *
222 * @param prng random number generator object (for external reproducibility)
223 */
224 70296782 void Randomize(Prng *prng) {
225 70296782 const unsigned bytes = GetDigestSize();
226
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 1380124518 for (unsigned i = 0; i < bytes; ++i) {
227 1309827736 digest[i] = prng->Next(256);
228 }
229 70296782 }
230
231 79942 bool HasSuffix() const { return suffix != kSuffixNone; }
232 14053216 void set_suffix(const Suffix s) { suffix = s; }
233
234 /**
235 * Generates a hexified representation of the digest including the identifier
236 * string for newly added hashes.
237 *
238 * @param with_suffix append the hash suffix (C,H,X, ...) to the result
239 * @return a string representation of the digest
240 */
241 17691337 std::string ToString(const bool with_suffix = false) const {
242 17691337 Hex hex(this);
243
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 17691418 const bool use_suffix = with_suffix && HasSuffix();
244 17690932 const unsigned string_length = hex.length() + use_suffix;
245
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 17690198 std::string result(string_length, 0);
246
247
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 712093585 for (unsigned int i = 0; i < hex.length(); ++i) {
248
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 694718394 result[i] = hex[i];
249 }
250
251
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 16938998 if (use_suffix) {
252
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 3148 result[string_length - 1] = suffix;
253 }
254
255
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 16938998 assert(result.length() == string_length);
256 35360116 return result;
257 }
258
259 /**
260 * Generates a hexified representation of the digest including the identifier
261 * string for newly added hashes. Output is in the form of
262 * 'openssl x509 fingerprint', e.g. 00:AA:BB:...-SHAKE128
263 *
264 * @param with_suffix append the hash suffix (C,H,X, ...) to the result
265 * @return a string representation of the digest
266 */
267 368 std::string ToFingerprint(const bool with_suffix = false) const {
268 368 Hex hex(this);
269
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 368 const bool use_suffix = with_suffix && HasSuffix();
270 368 const unsigned string_length = hex.length() + kDigestSizes[algorithm] - 1
271 368 + use_suffix;
272
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 368 std::string result(string_length, 0);
273
274 368 unsigned l = hex.length();
275
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 15824 for (unsigned int hex_i = 0, result_i = 0; hex_i < l; ++hex_i, ++result_i) {
276
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 15456 result[result_i] = toupper(hex[hex_i]);
277
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 15456 if ((hex_i < 2 * kDigestSizes[algorithm] - 1) && (hex_i % 2 == 1)) {
278
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 6624 result[++result_i] = ':';
279 }
280 }
281
282
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 368 if (use_suffix) {
283
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 184 result[string_length - 1] = suffix;
284 }
285
286
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 368 assert(result.length() == string_length);
287 736 return result;
288 }
289
290 /**
291 * Convenience method to generate a string representation of the digest.
292 * See Digest<>::ToString() for details
293 *
294 * @return a string representation including the hash suffix of the digest
295 */
296 6243 std::string ToStringWithSuffix() const { return ToString(true); }
297
298 /**
299 * Generate the standard relative path from the hexified digest to be used in
300 * CAS areas or cache directories. Throughout the entire system we use one
301 * directory level (first to hex digest characters) for namespace splitting.
302 * Note: This method appends the internal hash suffix to the path.
303 *
304 * @return a relative path representation of the digest including the suffix
305 */
306 22954 std::string MakePath() const { return MakePathExplicit(1, 2, suffix); }
307
308 /**
309 * The alternative path is used to symlink the root catalog from the webserver
310 * root to the data directory. This way, the data directory can be protected
311 * while the root catalog remains accessible.
312 */
313 382 std::string MakeAlternativePath() const {
314
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 382 return ".cvmfsalt-" + ToStringWithSuffix();
315 }
316
317 /**
318 * Produces a relative path representation of the digest without appending the
319 * hash suffix. See Digest<>::MakePath() for more details.
320 *
321 * @return a relative path representation of the digest without the suffix
322 */
323 359047 std::string MakePathWithoutSuffix() const {
324 359047 return MakePathExplicit(1, 2, kSuffixNone);
325 }
326
327 /**
328 * Generates an arbitrary path representation of the digest. Both number of
329 * directory levels and the hash-digits per level can be customized. Further-
330 * more an arbitrary hash suffix can be provided.
331 * Note: This method is mainly meant for internal usage but stays public for
332 * historical reasons.
333 *
334 * @param dir_levels the number of namespace splitting directory levels
335 * @param digits_per_level each directory level's number of hex-digits
336 * @param hash_suffix the hash suffix character to be appended
337 * @return a relative path representation of the digest
338 */
339 382737 std::string MakePathExplicit(const unsigned dir_levels,
340 const unsigned digits_per_level,
341 const Suffix hash_suffix = kSuffixNone) const {
342 382737 Hex hex(this);
343
344 // figure out how big the output string needs to be
345 382737 const bool use_suffix = (hash_suffix != kSuffixNone);
346 382737 const unsigned string_length = hex.length() + dir_levels + use_suffix;
347 382737 std::string result;
348
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 382737 result.resize(string_length);
349
350 // build hexified hash and path delimiters
351 382737 unsigned i = 0;
352 382737 unsigned pos = 0;
353
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 15678835 for (; i < hex.length(); ++i) {
354
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 15296098 if (i > 0 && (i % digits_per_level == 0)
355
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 7267267 && (i / digits_per_level <= dir_levels)) {
356
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 383105 result[pos++] = '/';
357 }
358
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 15296098 result[pos++] = hex[i];
359 }
360
361 // (optionally) add hash hint suffix
362
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 382737 if (use_suffix) {
363
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 13380 result[pos++] = hash_suffix;
364 }
365
366
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 382737 assert(i == hex.length());
367
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 382737 assert(pos == string_length);
368 765474 return result;
369 }
370
371 57548867 bool IsNull() const {
372
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 339812647 for (unsigned i = 0; i < kDigestSizes[algorithm]; ++i) {
373
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 325714990 if (digest[i] != 0)
374 43451210 return false;
375 }
376 14097657 return true;
377 }
378
379 /**
380 * Get a partial digest for use when only 32 bits are required
381 */
382 496 uint32_t Partial32() const {
383 496 const uint32_t *partial = (const uint32_t *)digest;
384 496 return ntohl(*partial);
385 }
386
387
388 795847930 void SetNull() { memset(digest, 0, digest_size_); }
389
390
391 738870440 bool operator==(const Digest<digest_size_, algorithm_> &other) const {
392
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 738870440 if (this->algorithm != other.algorithm)
393 238090570 return false;
394
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 5568747344 for (unsigned i = 0; i < kDigestSizes[algorithm]; ++i) {
395
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 5298175812 if (this->digest[i] != other.digest[i])
396 230208338 return false;
397 }
398 270571532 return true;
399 }
400
401 49440567 bool operator!=(const Digest<digest_size_, algorithm_> &other) const {
402 49440567 return !(*this == other);
403 }
404
405 2531187841 bool operator<(const Digest<digest_size_, algorithm_> &other) const {
406
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 2531187841 if (this->algorithm != other.algorithm)
407 90920832 return (this->algorithm < other.algorithm);
408
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 6429381278 for (unsigned i = 0; i < kDigestSizes[algorithm]; ++i) {
409
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 6537485494 if (this->digest[i] > other.digest[i])
410 1207306752 return false;
411
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 5330178742 if (this->digest[i] < other.digest[i])
412 1341064473 return true;
413 }
414 42 return false;
415 }
416
417 1144094 bool operator>(const Digest<digest_size_, algorithm_> &other) const {
418
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 1144094 if (this->algorithm != other.algorithm)
419 ✗ return (this->algorithm > other.algorithm);
420
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 1349353 for (unsigned i = 0; i < kDigestSizes[algorithm]; ++i) {
421
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 1347625 if (this->digest[i] < other.digest[i])
422 432110 return false;
423
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 915515 if (this->digest[i] > other.digest[i])
424 710256 return true;
425 }
426 1728 return false;
427 }
428 };
429
430
431 struct CVMFS_EXPORT Md5 : public Digest<16, kMd5> {
432 82815709 Md5() : Digest<16, kMd5>() { }
433 explicit Md5(const AsciiPtr ascii);
434 241 explicit Md5(const HexPtr hex) : Digest<16, kMd5>(kMd5, hex) { }
435 Md5(const char *chars, const unsigned length);
436
437 /**
438 * An MD5 hash can be seen as two 64bit integers.
439 */
440 Md5(const uint64_t lo, const uint64_t hi);
441 void ToIntPair(uint64_t *lo, uint64_t *hi) const;
442 };
443
444 struct CVMFS_EXPORT Sha1 : public Digest<20, kSha1> { };
445 struct CVMFS_EXPORT Rmd160 : public Digest<20, kRmd160> { };
446 struct CVMFS_EXPORT Shake128 : public Digest<20, kShake128> { };
447
448 /**
449 * Any as such must not be used except for digest storage.
450 * To do real work, the class has to be "blessed" to be a real hash by
451 * setting the algorithm field accordingly.
452 */
453 struct CVMFS_EXPORT Any : public Digest<kMaxDigestSize, kAny> {
454 233185958 Any() : Digest<kMaxDigestSize, kAny>() { }
455
456 73017758 explicit Any(const Algorithms a, const char s = kSuffixNone)
457 73017758 : Digest<kMaxDigestSize, kAny>() {
458 73017758 algorithm = a;
459 73017758 suffix = s;
460 73017758 }
461
462 11540 Any(const Algorithms a,
463 const unsigned char *digest_buffer,
464 const Suffix suffix = kSuffixNone)
465 11540 : Digest<kMaxDigestSize, kAny>(a, digest_buffer, suffix) { }
466
467 298679 explicit Any(const Algorithms a,
468 const HexPtr hex,
469 const char suffix = kSuffixNone)
470 298679 : Digest<kMaxDigestSize, kAny>(a, hex, suffix) { }
471
472 Md5 CastToMd5();
473 };
474
475
476 /**
477 * Actual operations on digests, like "hash a file", "hash a buffer", or
478 * iterative operations.
479 */
480 CVMFS_EXPORT unsigned GetContextSize(const Algorithms algorithm);
481
482 /**
483 * Holds an OpenSSL context, only required for hash operations. Allows to
484 * deferr the storage allocation for the context to alloca.
485 */
486 class CVMFS_EXPORT ContextPtr {
487 public:
488 Algorithms algorithm;
489 void *buffer;
490 unsigned size;
491
492 1288869 ContextPtr() : algorithm(kAny), buffer(NULL), size(0) { }
493
494 629917 explicit ContextPtr(const Algorithms a)
495 629917 : algorithm(a), buffer(NULL), size(GetContextSize(a)) { }
496 ✗ ContextPtr(const Algorithms a, void *b)
497 ✗ : algorithm(a), buffer(b), size(GetContextSize(a)) { }
498 };
499
500 CVMFS_EXPORT void Init(ContextPtr context);
501 CVMFS_EXPORT void Update(const unsigned char *buffer,
502 const unsigned buffer_size,
503 ContextPtr context);
504 CVMFS_EXPORT void Final(ContextPtr context, Any *any_digest);
505 CVMFS_EXPORT bool HashFile(const std::string &filename, Any *any_digest);
506 CVMFS_EXPORT bool HashFd(int fd, Any *any_digest);
507 CVMFS_EXPORT void HashMem(const unsigned char *buffer,
508 const unsigned buffer_size,
509 Any *any_digest);
510 CVMFS_EXPORT void HashString(const std::string &content, Any *any_digest);
511 CVMFS_EXPORT void Hmac(const std::string &key,
512 const unsigned char *buffer,
513 const unsigned buffer_size,
514 Any *any_digest);
515 46 inline void HmacString(const std::string &key, const std::string &content,
516 Any *any_digest) {
517 46 Hmac(key,
518 46 reinterpret_cast<const unsigned char *>(content.data()),
519 46 content.size(),
520 any_digest);
521 46 }
522
523 /**
524 * Only used for AWS4 signature.
525 *
526 * Adding SHA-256 to the standard hash infrastructure would generally bloat the
527 * digets size to 32 bytes and require client data structure transformation
528 * during hotpatch.
529 */
530 CVMFS_EXPORT std::string Hmac256(const std::string &key,
531 const std::string &content,
532 bool raw_output = false);
533 CVMFS_EXPORT std::string Sha256File(const std::string &filename);
534 CVMFS_EXPORT std::string Sha256Mem(const unsigned char *buffer,
535 const unsigned buffer_size);
536 CVMFS_EXPORT std::string Sha256String(const std::string &content);
537
538 CVMFS_EXPORT
539 Algorithms ParseHashAlgorithm(const std::string &algorithm_option);
540 CVMFS_EXPORT
541 Any MkFromHexPtr(const HexPtr hex, const Suffix suffix = kSuffixNone);
542 CVMFS_EXPORT Any MkFromSuffixedHexPtr(const HexPtr hex);
543
544 } // namespace shash
545
546 #ifdef CVMFS_NAMESPACE_GUARD
547 } // namespace CVMFS_NAMESPACE_GUARD
548 #endif
549
550 #endif // CVMFS_CRYPTO_HASH_H_
551