GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/crypto/hash.cc
Date: 2025-09-28 02:35:26
Exec Total Coverage
Lines: 275 306 89.9%
Branches: 169 268 63.1%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5
6 #include "crypto/hash.h"
7
8 #include <alloca.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <openssl/hmac.h>
12 #include <openssl/md5.h>
13 #include <openssl/ripemd.h>
14 #include <openssl/sha.h>
15 #include <unistd.h>
16
17 #include <cstdio>
18 #include <cstring>
19
20 #include "KeccakHash.h"
21 #include "crypto/openssl_version.h"
22 #include "util/exception.h"
23
24
25 using namespace std; // NOLINT
26
27 #ifdef CVMFS_NAMESPACE_GUARD
28 namespace CVMFS_NAMESPACE_GUARD {
29 #endif
30
31 namespace shash {
32
33 const char *kAlgorithmIds[] = {"", "", "-rmd160", "-shake128", ""};
34
35
36 132 bool HexPtr::IsValid() const {
37 132 const unsigned l = str->length();
38
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 132 if (l == 0)
39 6 return false;
40 126 const char *c = str->data(); // Walks through the string
41 126 unsigned i = 0; // String position of *c
42
43
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 4950 for (; i < l; ++i, ++c) {
44
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 4920 if (*c == '-')
45 84 break;
46
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 4836 if ((*c < '0') || (*c > 'f') || ((*c > '9') && (*c < 'a')))
47 12 return false;
48 }
49
50 // Walk through all algorithms
51
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 510 for (unsigned j = 0; j < kAny; ++j) {
52 420 const unsigned hex_length = 2 * kDigestSizes[j];
53 420 const unsigned algo_id_length = kAlgorithmIdSizes[j];
54
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 420 if (i == hex_length) {
55 // Right suffix?
56
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 390 for (; (i < l) && (i - hex_length < algo_id_length); ++i, ++c) {
57
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 318 if (*c != kAlgorithmIds[j][i - hex_length])
58 60 break;
59 }
60
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 132 if ((i == l) && (l == hex_length + algo_id_length))
61 24 return true;
62 108 i = hex_length;
63 108 c = str->data() + i;
64 }
65 }
66
67 90 return false;
68 }
69
70
71 ✗ Algorithms ParseHashAlgorithm(const string &algorithm_option) {
72 ✗ if (algorithm_option == "sha1")
73 ✗ return kSha1;
74 ✗ if (algorithm_option == "rmd160")
75 ✗ return kRmd160;
76 ✗ if (algorithm_option == "shake128")
77 ✗ return kShake128;
78 ✗ return kAny;
79 }
80
81
82 281975 Any MkFromHexPtr(const HexPtr hex, const char suffix) {
83 281975 Any result;
84
85 281975 const unsigned length = hex.str->length();
86
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 281975 if (length == 2 * kDigestSizes[kMd5])
87 6 result = Any(kMd5, hex);
88
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 281975 if (length == 2 * kDigestSizes[kSha1])
89 281819 result = Any(kSha1, hex);
90 // TODO(jblomer) compare -rmd160, -shake128
91
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 281975 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160]))
92 24 result = Any(kRmd160, hex);
93
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 281975 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128]))
94 26 result = Any(kShake128, hex);
95
96 281975 result.suffix = suffix;
97 281975 return result;
98 }
99
100
101 /**
102 * Similar to MkFromHexPtr but the suffix is deducted from the HexPtr string.
103 */
104 39929 Any MkFromSuffixedHexPtr(const HexPtr hex) {
105 39929 Any result;
106
107 39929 const unsigned length = hex.str->length();
108
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 39929 if ((length == 2 * kDigestSizes[kMd5])
109
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 2285 || (length == 2 * kDigestSizes[kMd5] + 1)) {
110 37650 const Suffix suffix = (length == 2 * kDigestSizes[kMd5] + 1)
111
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 37650 ? *(hex.str->rbegin())
112 37650 : kSuffixNone;
113 37650 result = Any(kMd5, hex, suffix);
114 }
115
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 39929 if ((length == 2 * kDigestSizes[kSha1])
116
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 38706 || (length == 2 * kDigestSizes[kSha1] + 1)) {
117 2237 const Suffix suffix = (length == 2 * kDigestSizes[kSha1] + 1)
118
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 2237 ? *(hex.str->rbegin())
119 2237 : kSuffixNone;
120 2237 result = Any(kSha1, hex, suffix);
121 }
122
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 39929 if ((length == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160])
123 39923 || (length
124
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 39923 == 2 * kDigestSizes[kRmd160] + kAlgorithmIdSizes[kRmd160] + 1)) {
125 const Suffix suffix = (length
126 24 == 2 * kDigestSizes[kRmd160]
127 24 + kAlgorithmIdSizes[kRmd160] + 1)
128
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 24 ? *(hex.str->rbegin())
129 24 : kSuffixNone;
130 24 result = Any(kRmd160, hex, suffix);
131 }
132
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 39929 if ((length == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128])
133 39923 || (length
134
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 39923 == 2 * kDigestSizes[kShake128] + kAlgorithmIdSizes[kShake128] + 1)) {
135 const Suffix suffix = (length
136 12 == 2 * kDigestSizes[kShake128]
137 12 + kAlgorithmIdSizes[kShake128] + 1)
138
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 12 ? *(hex.str->rbegin())
139 12 : kSuffixNone;
140 12 result = Any(kShake128, hex, suffix);
141 }
142
143 39929 return result;
144 }
145
146
147 /**
148 * Allows the caller to create the context on the stack.
149 */
150 995857 unsigned GetContextSize(const Algorithms algorithm) {
151
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 995857 switch (algorithm) {
152 204814 case kMd5:
153 204814 return sizeof(MD5_CTX);
154 790070 case kSha1:
155 790070 return sizeof(SHA_CTX);
156 74 case kRmd160:
157 74 return sizeof(RIPEMD160_CTX);
158 983 case kShake128:
159 983 return sizeof(Keccak_HashInstance);
160 ✗ default:
161 ✗ PANIC(kLogDebug | kLogSyslogErr,
162 "tried to generate hash context for unspecified hash. Aborting...");
163 }
164 }
165
166 996395 void Init(ContextPtr context) {
167 HashReturn keccak_result;
168
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 996395 switch (context.algorithm) {
169 204832 case kMd5:
170
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 204832 assert(context.size == sizeof(MD5_CTX));
171 204832 MD5_Init(reinterpret_cast<MD5_CTX *>(context.buffer));
172 204832 break;
173 790509 case kSha1:
174
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 790509 assert(context.size == sizeof(SHA_CTX));
175 790509 SHA1_Init(reinterpret_cast<SHA_CTX *>(context.buffer));
176 790344 break;
177 74 case kRmd160:
178
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 74 assert(context.size == sizeof(RIPEMD160_CTX));
179 74 RIPEMD160_Init(reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
180 74 break;
181 983 case kShake128:
182
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 983 assert(context.size == sizeof(Keccak_HashInstance));
183 983 keccak_result = Keccak_HashInitialize_SHAKE128(
184 reinterpret_cast<Keccak_HashInstance *>(context.buffer));
185
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 983 assert(keccak_result == SUCCESS);
186 983 break;
187 ✗ default:
188 ✗ PANIC(NULL); // Undefined hash
189 }
190 996233 }
191
192 556176205 void Update(const unsigned char *buffer, const unsigned buffer_length,
193 ContextPtr context) {
194 HashReturn keccak_result;
195
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 556176205 switch (context.algorithm) {
196 139716701 case kMd5:
197
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 139716701 assert(context.size == sizeof(MD5_CTX));
198 139716701 MD5_Update(reinterpret_cast<MD5_CTX *>(context.buffer), buffer,
199 buffer_length);
200 139716701 break;
201 139634404 case kSha1:
202
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 139634404 assert(context.size == sizeof(SHA_CTX));
203 139634404 SHA1_Update(reinterpret_cast<SHA_CTX *>(context.buffer), buffer,
204 buffer_length);
205 139636405 break;
206 138412118 case kRmd160:
207
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 138412118 assert(context.size == sizeof(RIPEMD160_CTX));
208 138412118 RIPEMD160_Update(reinterpret_cast<RIPEMD160_CTX *>(context.buffer),
209 buffer, buffer_length);
210 138412118 break;
211 138412997 case kShake128:
212
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 138412997 assert(context.size == sizeof(Keccak_HashInstance));
213 276825994 keccak_result = Keccak_HashUpdate(
214 138412997 reinterpret_cast<Keccak_HashInstance *>(context.buffer), buffer,
215 138412997 buffer_length * 8);
216
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 138412997 assert(keccak_result == SUCCESS);
217 138412997 break;
218 ✗ default:
219 ✗ PANIC(NULL); // Undefined hash
220 }
221 556178221 }
222
223 961919 void Final(ContextPtr context, Any *any_digest) {
224 HashReturn keccak_result;
225
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 961919 switch (context.algorithm) {
226 204808 case kMd5:
227
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 204808 assert(context.size == sizeof(MD5_CTX));
228 204808 MD5_Final(any_digest->digest,
229 204808 reinterpret_cast<MD5_CTX *>(context.buffer));
230 204808 break;
231 756063 case kSha1:
232
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 756063 assert(context.size == sizeof(SHA_CTX));
233 756063 SHA1_Final(any_digest->digest,
234 756063 reinterpret_cast<SHA_CTX *>(context.buffer));
235 760233 break;
236 74 case kRmd160:
237
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 74 assert(context.size == sizeof(RIPEMD160_CTX));
238 74 RIPEMD160_Final(any_digest->digest,
239 74 reinterpret_cast<RIPEMD160_CTX *>(context.buffer));
240 74 break;
241 983 case kShake128:
242
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 983 assert(context.size == sizeof(Keccak_HashInstance));
243 1966 keccak_result = Keccak_HashFinal(
244 983 reinterpret_cast<Keccak_HashInstance *>(context.buffer), NULL);
245
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 983 assert(keccak_result == SUCCESS);
246 1966 keccak_result = Keccak_HashSqueeze(
247 983 reinterpret_cast<Keccak_HashInstance *>(context.buffer),
248 983 any_digest->digest, kDigestSizes[kShake128] * 8);
249 983 break;
250 ✗ default:
251 ✗ PANIC(NULL); // Undefined hash
252 }
253 966098 any_digest->algorithm = context.algorithm;
254 966098 }
255
256
257 9147 void HashMem(const unsigned char *buffer, const unsigned buffer_size,
258 Any *any_digest) {
259 9147 const Algorithms algorithm = any_digest->algorithm;
260
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 9147 ContextPtr context(algorithm);
261 9147 context.buffer = alloca(context.size);
262
263
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 9147 Init(context);
264
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 9147 Update(buffer, buffer_size, context);
265
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 9147 Final(context, any_digest);
266 9147 }
267
268
269 1283 void HashString(const std::string &content, Any *any_digest) {
270 1283 HashMem(reinterpret_cast<const unsigned char *>(content.data()),
271 1283 content.length(), any_digest);
272 1283 }
273
274
275 101282 void Hmac(const string &key,
276 const unsigned char *buffer,
277 const unsigned buffer_size,
278 Any *any_digest) {
279 101282 const Algorithms algorithm = any_digest->algorithm;
280
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 101282 assert(algorithm != kAny);
281
282 101282 const unsigned block_size = kBlockSizes[algorithm];
283 101282 unsigned char key_block[block_size];
284 101282 memset(key_block, 0, block_size);
285
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 101282 if (key.length() > block_size) {
286
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 1222 Any hash_key(algorithm);
287
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 1222 HashMem(reinterpret_cast<const unsigned char *>(key.data()), key.length(),
288 &hash_key);
289 1222 memcpy(key_block, hash_key.digest, kDigestSizes[algorithm]);
290 } else {
291
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 100060 if (key.length() > 0)
292 100042 memcpy(key_block, key.data(), key.length());
293 }
294
295 101282 unsigned char pad_block[block_size];
296 // Inner hash
297
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 101282 Any hash_inner(algorithm);
298
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 101282 ContextPtr context_inner(algorithm);
299 101282 context_inner.buffer = alloca(context_inner.size);
300
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 101282 Init(context_inner);
301
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 6583330 for (unsigned i = 0; i < block_size; ++i)
302 6482048 pad_block[i] = key_block[i] ^ 0x36;
303
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 101282 Update(pad_block, block_size, context_inner);
304
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 101282 Update(buffer, buffer_size, context_inner);
305
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 101282 Final(context_inner, &hash_inner);
306
307 // Outer hash
308
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 101282 ContextPtr context_outer(algorithm);
309 101282 context_outer.buffer = alloca(context_outer.size);
310
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 101282 Init(context_outer);
311
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 6583330 for (unsigned i = 0; i < block_size; ++i)
312 6482048 pad_block[i] = key_block[i] ^ 0x5c;
313
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 101282 Update(pad_block, block_size, context_outer);
314
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 101282 Update(hash_inner.digest, kDigestSizes[algorithm], context_outer);
315
316
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 101282 Final(context_outer, any_digest);
317 101282 }
318
319
320 2327 bool HashFd(int fd, Any *any_digest) {
321 2327 const Algorithms algorithm = any_digest->algorithm;
322
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 2327 ContextPtr context(algorithm);
323 2327 context.buffer = alloca(context.size);
324
325
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 2327 Init(context);
326 unsigned char io_buffer[4096];
327 int actual_bytes;
328
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 957381 while ((actual_bytes = read(fd, io_buffer, 4096)) != 0) {
329
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 955054 if (actual_bytes == -1) {
330 ✗ if (errno == EINTR)
331 ✗ continue;
332 ✗ return false;
333 }
334
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 955054 Update(io_buffer, actual_bytes, context);
335 }
336
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 2327 Final(context, any_digest);
337 2327 return true;
338 }
339
340
341 2327 bool HashFile(const std::string &filename, Any *any_digest) {
342 2327 const int fd = open(filename.c_str(), O_RDONLY);
343
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 2327 if (fd == -1)
344 ✗ return false;
345
346 2327 const bool result = HashFd(fd, any_digest);
347 2327 close(fd);
348 2327 return result;
349 }
350
351
352 /**
353 * Fast constructor for hashing path names.
354 */
355 8991 Md5::Md5(const AsciiPtr ascii) {
356 8991 algorithm = kMd5;
357 8991 const string *str = ascii.str;
358
359 MD5_CTX md5_state;
360
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 8991 MD5_Init(&md5_state);
361
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 8991 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(&(*str)[0]),
362 str->length());
363
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 8991 MD5_Final(digest, &md5_state);
364 8991 }
365
366
367 8900097 Md5::Md5(const char *chars, const unsigned length) {
368 8900097 algorithm = kMd5;
369
370 MD5_CTX md5_state;
371
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 8900097 MD5_Init(&md5_state);
372
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 8900097 MD5_Update(&md5_state, reinterpret_cast<const unsigned char *>(chars),
373 length);
374
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 8900097 MD5_Final(digest, &md5_state);
375 8900097 }
376
377
378 ✗ Md5::Md5(const uint64_t lo, const uint64_t hi) {
379 ✗ algorithm = kMd5;
380 ✗ memcpy(digest, &lo, 8);
381 ✗ memcpy(digest + 8, &hi, 8);
382 }
383
384 11636 void Md5::ToIntPair(uint64_t *lo, uint64_t *hi) const {
385 11636 memcpy(lo, digest, 8);
386 11636 memcpy(hi, digest + 8, 8);
387 11636 }
388
389
390 100046 Md5 Any::CastToMd5() {
391
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 100046 assert(algorithm == kMd5);
392 100046 Md5 result;
393 100046 memcpy(result.digest, digest, kDigestSizes[kMd5]);
394 100046 return result;
395 }
396
397 #ifndef OPENSSL_API_INTERFACE_V09
398 36 static string HexFromSha256(unsigned char digest[SHA256_DIGEST_LENGTH]) {
399 36 string result;
400
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 36 result.reserve(2 * SHA256_DIGEST_LENGTH);
401
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 1188 for (unsigned i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
402 1152 const char d1 = digest[i] / 16;
403 1152 const char d2 = digest[i] % 16;
404
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 1152 result.push_back(d1 + ((d1 <= 9) ? '0' : 'a' - 10));
405
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 1152 result.push_back(d2 + ((d2 <= 9) ? '0' : 'a' - 10));
406 }
407 36 return result;
408 }
409 #endif
410
411 6 string Sha256File(const string &filename) {
412 #ifdef OPENSSL_API_INTERFACE_V09
413 PANIC(NULL);
414 #else
415
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 6 const int fd = open(filename.c_str(), O_RDONLY);
416
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 6 if (fd < 0)
417 ✗ return "";
418
419 SHA256_CTX ctx;
420
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 6 SHA256_Init(&ctx);
421
422 unsigned char io_buffer[4096];
423 int actual_bytes;
424
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 6 while ((actual_bytes = read(fd, io_buffer, 4096)) != 0) {
425 ✗ if (actual_bytes == -1) {
426 ✗ if (errno == EINTR)
427 ✗ continue;
428 ✗ close(fd);
429 ✗ return "";
430 }
431 ✗ SHA256_Update(&ctx, io_buffer, actual_bytes);
432 }
433
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 6 close(fd);
434
435 unsigned char digest[SHA256_DIGEST_LENGTH];
436
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 6 SHA256_Final(digest, &ctx);
437
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 6 return HexFromSha256(digest);
438 #endif
439 }
440
441 12 string Sha256Mem(const unsigned char *buffer, const unsigned buffer_size) {
442 #ifdef OPENSSL_API_INTERFACE_V09
443 PANIC(NULL);
444 #else
445 unsigned char digest[SHA256_DIGEST_LENGTH];
446
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 12 SHA256(buffer, buffer_size, digest);
447
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 24 return HexFromSha256(digest);
448 #endif
449 }
450
451 6 string Sha256String(const string &content) {
452 6 return Sha256Mem(reinterpret_cast<const unsigned char *>(content.data()),
453 6 content.length());
454 }
455
456
457 42 std::string Hmac256(const std::string &key,
458 const std::string &content,
459 bool raw_output) {
460 #ifdef OPENSSL_API_INTERFACE_V09
461 PANIC(NULL);
462 #else
463 unsigned char digest[SHA256_DIGEST_LENGTH];
464 42 const unsigned block_size = 64;
465 42 const unsigned key_length = key.length();
466 unsigned char key_block[block_size];
467 42 memset(key_block, 0, block_size);
468
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 42 if (key_length > block_size) {
469
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 6 SHA256(reinterpret_cast<const unsigned char *>(key.data()), key_length,
470 key_block);
471 } else {
472
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 36 if (key.length() > 0)
473 36 memcpy(key_block, key.data(), key_length);
474 }
475
476 unsigned char pad_block[block_size];
477 // Inner hash
478 SHA256_CTX ctx_inner;
479 unsigned char digest_inner[SHA256_DIGEST_LENGTH];
480
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 42 SHA256_Init(&ctx_inner);
481
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 2730 for (unsigned i = 0; i < block_size; ++i)
482 2688 pad_block[i] = key_block[i] ^ 0x36;
483
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 42 SHA256_Update(&ctx_inner, pad_block, block_size);
484
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 42 SHA256_Update(&ctx_inner, content.data(), content.length());
485
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 42 SHA256_Final(digest_inner, &ctx_inner);
486
487 // Outer hash
488 SHA256_CTX ctx_outer;
489
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 42 SHA256_Init(&ctx_outer);
490
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491 2688 pad_block[i] = key_block[i] ^ 0x5c;
492
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 42 SHA256_Update(&ctx_outer, pad_block, block_size);
493
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 42 SHA256_Update(&ctx_outer, digest_inner, SHA256_DIGEST_LENGTH);
494
495
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 42 SHA256_Final(digest, &ctx_outer);
496
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 42 if (raw_output)
497
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 24 return string(reinterpret_cast<const char *>(digest), SHA256_DIGEST_LENGTH);
498
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 18 return HexFromSha256(digest);
499 #endif
500 }
501
502 } // namespace shash
503
504 #ifdef CVMFS_NAMESPACE_GUARD
505 } // namespace CVMFS_NAMESPACE_GUARD
506 #endif
507