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SkMD5.cpp File Reference
#include "src/base/SkUtils.h"
#include "src/core/SkMD5.h"
#include "include/private/base/SkFeatures.h"
#include "include/private/base/SkMalloc.h"

Go to the source code of this file.

Classes

struct  F
 
struct  G
 
struct  H
 
struct  I
 

Functions

static void transform (uint32_t state[4], const uint8_t block[64])
 
static void encode (uint8_t output[16], const uint32_t input[4])
 
static void encode (uint8_t output[8], const uint64_t input)
 
static const uint32_t * decode (uint32_t storage[16], const uint8_t input[64])
 
static SkString to_hex_string (const uint8_t *data, const char *hexDigits)
 
static uint32_t rotate_left (uint32_t x, uint8_t n)
 
template<typename T >
static void operation (T operation, uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint8_t s, uint32_t t)
 
static bool is_aligned (const void *pointer, size_t byte_count)
 

Function Documentation

◆ decode()

static const uint32_t * decode ( uint32_t  storage[16],
const uint8_t  input[64] 
)
static

Decodes input (4 little endian 32 bit values) into storage, if required.

Definition at line 264 of file SkMD5.cpp.

264 {
265#if defined(SK_CPU_LENDIAN) && defined(SK_CPU_FAST_UNALIGNED_ACCESS)
266 return reinterpret_cast<const uint32_t*>(input);
267#else
268#if defined(SK_CPU_LENDIAN)
269 if (is_aligned(input, 4)) {
270 return reinterpret_cast<const uint32_t*>(input);
271 }
272#endif
273 for (size_t i = 0, j = 0; j < 64; i++, j += 4) {
274 storage[i] = ((uint32_t)input[j ]) |
275 (((uint32_t)input[j+1]) << 8) |
276 (((uint32_t)input[j+2]) << 16) |
277 (((uint32_t)input[j+3]) << 24);
278 }
279 return storage;
280#endif
281}
is_aligned
static bool is_aligned(const void *pointer, size_t byte_count)
Definition: SkMD5.cpp:260
i
int i
Definition: fl_socket_accessible.cc:18

◆ encode() [1/2]

static void encode ( uint8_t  output[16],
const uint32_t  input[4] 
)
static

Encodes input into output (4 little endian 32 bit values).

Definition at line 240 of file SkMD5.cpp.

240 {
241 for (size_t i = 0, j = 0; i < 4; i++, j += 4) {
242 output[j ] = (uint8_t) (input[i] & 0xff);
243 output[j+1] = (uint8_t)((input[i] >> 8) & 0xff);
244 output[j+2] = (uint8_t)((input[i] >> 16) & 0xff);
245 output[j+3] = (uint8_t)((input[i] >> 24) & 0xff);
246 }
247}
dart_profiler_symbols.output
output
Definition: dart_profiler_symbols.py:51

◆ encode() [2/2]

static void encode ( uint8_t  output[8],
const uint64_t  input 
)
static

Encodes input into output (little endian 64 bit value).

Definition at line 249 of file SkMD5.cpp.

249 {
250 output[0] = (uint8_t) (input & 0xff);
251 output[1] = (uint8_t)((input >> 8) & 0xff);
252 output[2] = (uint8_t)((input >> 16) & 0xff);
253 output[3] = (uint8_t)((input >> 24) & 0xff);
254 output[4] = (uint8_t)((input >> 32) & 0xff);
255 output[5] = (uint8_t)((input >> 40) & 0xff);
256 output[6] = (uint8_t)((input >> 48) & 0xff);
257 output[7] = (uint8_t)((input >> 56) & 0xff);
258}

◆ is_aligned()

static bool is_aligned ( const void *  pointer,
size_t  byte_count 
)
inlinestatic

Definition at line 260 of file SkMD5.cpp.

260 {
261 return reinterpret_cast<uintptr_t>(pointer) % byte_count == 0;
262}

◆ operation()

template<typename T >
static void operation ( T  operation,
uint32_t &  a,
uint32_t  b,
uint32_t  c,
uint32_t  d,
uint32_t  x,
uint8_t  s,
uint32_t  t 
)
inlinestatic

Definition at line 144 of file SkMD5.cpp.

145 {
146 a = b + rotate_left(a + operation(b, c, d) + x + t, s);
147}
rotate_left
static uint32_t rotate_left(uint32_t x, uint8_t n)
Definition: SkMD5.cpp:139
operation
static void operation(T operation, uint32_t &a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint8_t s, uint32_t t)
Definition: SkMD5.cpp:144
d
VULKAN_HPP_DEFAULT_DISPATCH_LOADER_DYNAMIC_STORAGE auto & d
Definition: main.cc:19
b
static bool b
Definition: ffi_native_test_module.c:74
s
struct MyStruct s
a
struct MyStruct a[10]
x
double x
Definition: mouse-input-test.cc:82

◆ rotate_left()

static uint32_t rotate_left ( uint32_t  x,
uint8_t  n 
)
inlinestatic

Rotates x left n bits.

Definition at line 139 of file SkMD5.cpp.

139 {
140 return (x << n) | (x >> (32 - n));
141}

◆ to_hex_string()

static SkString to_hex_string ( const uint8_t *  data,
const char *  hexDigits 
)
static

Definition at line 102 of file SkMD5.cpp.

102 {
103 SkString hexString(2 * sizeof(SkMD5::Digest::data));
104 for (size_t i = 0; i < sizeof(SkMD5::Digest::data); ++i) {
105 uint8_t byte = data[i];
106 hexString[2 * i + 0] = hexDigits[byte >> 4];
107 hexString[2 * i + 1] = hexDigits[byte & 0xF];
108 }
109 return hexString;
110}
SkMD5::Digest::data
uint8_t data[16]
Definition: SkMD5.h:39
data
std::shared_ptr< const fml::Mapping > data
Definition: texture_gles.cc:63

◆ transform()

static void transform ( uint32_t  state[4],
const uint8_t  block[64] 
)
static

MD5 basic transformation. Transforms state based on block.

Definition at line 149 of file SkMD5.cpp.

149 {
150 uint32_t a = state[0], b = state[1], c = state[2], d = state[3];
151
152 uint32_t storage[16];
153 const uint32_t* X = decode(storage, block);
154
155 // Round 1
156 operation(F(), a, b, c, d, X[ 0], 7, 0xd76aa478); // 1
157 operation(F(), d, a, b, c, X[ 1], 12, 0xe8c7b756); // 2
158 operation(F(), c, d, a, b, X[ 2], 17, 0x242070db); // 3
159 operation(F(), b, c, d, a, X[ 3], 22, 0xc1bdceee); // 4
160 operation(F(), a, b, c, d, X[ 4], 7, 0xf57c0faf); // 5
161 operation(F(), d, a, b, c, X[ 5], 12, 0x4787c62a); // 6
162 operation(F(), c, d, a, b, X[ 6], 17, 0xa8304613); // 7
163 operation(F(), b, c, d, a, X[ 7], 22, 0xfd469501); // 8
164 operation(F(), a, b, c, d, X[ 8], 7, 0x698098d8); // 9
165 operation(F(), d, a, b, c, X[ 9], 12, 0x8b44f7af); // 10
166 operation(F(), c, d, a, b, X[10], 17, 0xffff5bb1); // 11
167 operation(F(), b, c, d, a, X[11], 22, 0x895cd7be); // 12
168 operation(F(), a, b, c, d, X[12], 7, 0x6b901122); // 13
169 operation(F(), d, a, b, c, X[13], 12, 0xfd987193); // 14
170 operation(F(), c, d, a, b, X[14], 17, 0xa679438e); // 15
171 operation(F(), b, c, d, a, X[15], 22, 0x49b40821); // 16
172
173 // Round 2
174 operation(G(), a, b, c, d, X[ 1], 5, 0xf61e2562); // 17
175 operation(G(), d, a, b, c, X[ 6], 9, 0xc040b340); // 18
176 operation(G(), c, d, a, b, X[11], 14, 0x265e5a51); // 19
177 operation(G(), b, c, d, a, X[ 0], 20, 0xe9b6c7aa); // 20
178 operation(G(), a, b, c, d, X[ 5], 5, 0xd62f105d); // 21
179 operation(G(), d, a, b, c, X[10], 9, 0x2441453); // 22
180 operation(G(), c, d, a, b, X[15], 14, 0xd8a1e681); // 23
181 operation(G(), b, c, d, a, X[ 4], 20, 0xe7d3fbc8); // 24
182 operation(G(), a, b, c, d, X[ 9], 5, 0x21e1cde6); // 25
183 operation(G(), d, a, b, c, X[14], 9, 0xc33707d6); // 26
184 operation(G(), c, d, a, b, X[ 3], 14, 0xf4d50d87); // 27
185 operation(G(), b, c, d, a, X[ 8], 20, 0x455a14ed); // 28
186 operation(G(), a, b, c, d, X[13], 5, 0xa9e3e905); // 29
187 operation(G(), d, a, b, c, X[ 2], 9, 0xfcefa3f8); // 30
188 operation(G(), c, d, a, b, X[ 7], 14, 0x676f02d9); // 31
189 operation(G(), b, c, d, a, X[12], 20, 0x8d2a4c8a); // 32
190
191 // Round 3
192 operation(H(), a, b, c, d, X[ 5], 4, 0xfffa3942); // 33
193 operation(H(), d, a, b, c, X[ 8], 11, 0x8771f681); // 34
194 operation(H(), c, d, a, b, X[11], 16, 0x6d9d6122); // 35
195 operation(H(), b, c, d, a, X[14], 23, 0xfde5380c); // 36
196 operation(H(), a, b, c, d, X[ 1], 4, 0xa4beea44); // 37
197 operation(H(), d, a, b, c, X[ 4], 11, 0x4bdecfa9); // 38
198 operation(H(), c, d, a, b, X[ 7], 16, 0xf6bb4b60); // 39
199 operation(H(), b, c, d, a, X[10], 23, 0xbebfbc70); // 40
200 operation(H(), a, b, c, d, X[13], 4, 0x289b7ec6); // 41
201 operation(H(), d, a, b, c, X[ 0], 11, 0xeaa127fa); // 42
202 operation(H(), c, d, a, b, X[ 3], 16, 0xd4ef3085); // 43
203 operation(H(), b, c, d, a, X[ 6], 23, 0x4881d05); // 44
204 operation(H(), a, b, c, d, X[ 9], 4, 0xd9d4d039); // 45
205 operation(H(), d, a, b, c, X[12], 11, 0xe6db99e5); // 46
206 operation(H(), c, d, a, b, X[15], 16, 0x1fa27cf8); // 47
207 operation(H(), b, c, d, a, X[ 2], 23, 0xc4ac5665); // 48
208
209 // Round 4
210 operation(I(), a, b, c, d, X[ 0], 6, 0xf4292244); // 49
211 operation(I(), d, a, b, c, X[ 7], 10, 0x432aff97); // 50
212 operation(I(), c, d, a, b, X[14], 15, 0xab9423a7); // 51
213 operation(I(), b, c, d, a, X[ 5], 21, 0xfc93a039); // 52
214 operation(I(), a, b, c, d, X[12], 6, 0x655b59c3); // 53
215 operation(I(), d, a, b, c, X[ 3], 10, 0x8f0ccc92); // 54
216 operation(I(), c, d, a, b, X[10], 15, 0xffeff47d); // 55
217 operation(I(), b, c, d, a, X[ 1], 21, 0x85845dd1); // 56
218 operation(I(), a, b, c, d, X[ 8], 6, 0x6fa87e4f); // 57
219 operation(I(), d, a, b, c, X[15], 10, 0xfe2ce6e0); // 58
220 operation(I(), c, d, a, b, X[ 6], 15, 0xa3014314); // 59
221 operation(I(), b, c, d, a, X[13], 21, 0x4e0811a1); // 60
222 operation(I(), a, b, c, d, X[ 4], 6, 0xf7537e82); // 61
223 operation(I(), d, a, b, c, X[11], 10, 0xbd3af235); // 62
224 operation(I(), c, d, a, b, X[ 2], 15, 0x2ad7d2bb); // 63
225 operation(I(), b, c, d, a, X[ 9], 21, 0xeb86d391); // 64
226
227 state[0] += a;
228 state[1] += b;
229 state[2] += c;
230 state[3] += d;
231
232#if defined(SK_MD5_CLEAR_DATA)
233 // Clear sensitive information.
234 if (X == &storage) {
235 memset(storage, 0, sizeof(storage));
236 }
237#endif
238}
decode
static const uint32_t * decode(uint32_t storage[16], const uint8_t input[64])
Definition: SkMD5.cpp:264
F
#define F(x)
X
static const SkScalar X
Definition: StrokeBench.cpp:54
H
#define H
Definition: constant_reader.cc:13
state
AtkStateType state
Definition: fl_accessible_node.cc:10
I
#define I
Definition: kernel_binary_flowgraph.cc:25
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