1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "blake3.h"
#include "blake3_impl.h"
#define HASH_MODE 0
#define KEYED_HASH_MODE 1
#define DERIVE_KEY_MODE 2
void hex_char_value(uint8_t c, uint8_t *value, bool *valid) {
if ('0' <= c && c <= '9') {
*value = c - '0';
*valid = true;
} else if ('a' <= c && c <= 'f') {
*value = 10 + c - 'a';
*valid = true;
} else {
*valid = false;
}
}
int parse_key(char *hex_key, uint8_t out[BLAKE3_KEY_LEN]) {
size_t hex_len = strlen(hex_key);
if (hex_len != 64) {
fprintf(stderr, "Expected a 64-char hexadecimal key, got %zu chars.\n",
hex_len);
return 1;
}
for (size_t i = 0; i < 64; i++) {
uint8_t value;
bool valid;
hex_char_value(hex_key[i], &value, &valid);
if (!valid) {
fprintf(stderr, "Invalid hex char.\n");
return 1;
}
if (i % 2 == 0) {
out[i / 2] = 0;
value <<= 4;
}
out[i / 2] += value;
}
return 0;
}
/* A little repetition here */
enum cpu_feature {
SSE2 = 1 << 0,
SSSE3 = 1 << 1,
SSE41 = 1 << 2,
AVX = 1 << 3,
AVX2 = 1 << 4,
AVX512F = 1 << 5,
AVX512VL = 1 << 6,
/* ... */
UNDEFINED = 1 << 30
};
extern enum cpu_feature g_cpu_features;
enum cpu_feature get_cpu_features();
int main(int argc, char **argv) {
size_t out_len = BLAKE3_OUT_LEN;
uint8_t key[BLAKE3_KEY_LEN];
char *context = "";
uint8_t mode = HASH_MODE;
while (argc > 1) {
if (argc <= 2) {
fprintf(stderr, "Odd number of arguments.\n");
return 1;
}
if (strcmp("--length", argv[1]) == 0) {
char *endptr = NULL;
unsigned long long out_len_ll = strtoull(argv[2], &endptr, 10);
// TODO: There are so many possible error conditions for parsing a
// non-negative size_t...I probably missed something.
if (errno != 0 || out_len > SIZE_MAX || endptr == argv[2] ||
*endptr != 0) {
fprintf(stderr, "Bad length argument.\n");
return 1;
}
// TODO: A more sanitary cast?
out_len = (size_t)out_len_ll;
} else if (strcmp("--keyed", argv[1]) == 0) {
mode = KEYED_HASH_MODE;
int ret = parse_key(argv[2], key);
if (ret != 0) {
return ret;
}
} else if (strcmp("--derive-key", argv[1]) == 0) {
mode = DERIVE_KEY_MODE;
context = argv[2];
} else {
fprintf(stderr, "Unknown flag.\n");
return 1;
}
argc -= 2;
argv += 2;
}
// We're going to hash the input multiple times, so we need to buffer it all.
// This is just for test cases, so go ahead and assume that the input is less
// than 1 MiB.
size_t buf_capacity = 1 << 20;
uint8_t *buf = malloc(buf_capacity);
assert(buf != NULL);
size_t buf_len = 0;
while (1) {
size_t n = fread(&buf[buf_len], 1, buf_capacity - buf_len, stdin);
if (n == 0) {
break;
}
buf_len += n;
assert(buf_len < buf_capacity);
}
const int mask = get_cpu_features();
int feature = 0;
do {
fprintf(stderr, "Testing 0x%08X\n", feature);
g_cpu_features = feature;
blake3_hasher hasher;
switch (mode) {
case HASH_MODE:
blake3_hasher_init(&hasher);
break;
case KEYED_HASH_MODE:
blake3_hasher_init_keyed(&hasher, key);
break;
case DERIVE_KEY_MODE:
blake3_hasher_init_derive_key(&hasher, context);
break;
default:
abort();
}
blake3_hasher_update(&hasher, buf, buf_len);
// TODO: An incremental output reader API to avoid this allocation.
uint8_t *out = malloc(out_len);
memset(out, 0, out_len);
if (out_len > 0 && out == NULL) {
fprintf(stderr, "malloc() failed.\n");
return 1;
}
blake3_hasher_finalize(&hasher, out, out_len);
for (size_t i = 0; i < out_len; i++) {
printf("%02x", out[i]);
}
printf("\n");
free(out);
feature = (feature - mask) & mask;
} while (feature != 0);
free(buf);
return 0;
}
|
