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Data Structures | Macros | Functions | Variables
md5.c File Reference
#include <stdint.h>
#include "bswap.h"
#include "intreadwrite.h"
#include "mem.h"
#include "md5.h"

Go to the source code of this file.

Data Structures

struct  AVMD5
 

Macros

#define CORE(i, a, b, c, d)
 
#define CORE2(i)
 
#define CORE4(i)   CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12))
 

Functions

struct AVMD5av_md5_alloc (void)
 Allocate an AVMD5 context. More...
 
static void body (uint32_t ABCD[4], const uint8_t *src, int nblocks)
 
void av_md5_init (AVMD5 *ctx)
 Initialize MD5 hashing. More...
 
void av_md5_update (AVMD5 *ctx, const uint8_t *src, int len)
 Update hash value. More...
 
void av_md5_final (AVMD5 *ctx, uint8_t *dst)
 Finish hashing and output digest value. More...
 
void av_md5_sum (uint8_t *dst, const uint8_t *src, const int len)
 Hash an array of data. More...
 

Variables

const int av_md5_size = sizeof(AVMD5)
 
static const uint8_t S [4][4]
 
static const uint32_t T [64]
 

Macro Definition Documentation

#define CORE (   i,
  a,
  b,
  c,
 
)
Value:
do { \
t = S[i >> 4][i & 3]; \
a += T[i]; \
if (i < 32) { \
if (i < 16) \
a += (d ^ (b & (c ^ d))) + AV_RL32(X+( i & 15));\
a += ((d & b) | (~d & c)) + AV_RL32(X+((1 + 5*i) & 15));\
} else { \
if (i < 48) \
a += (b ^ c ^ d) + AV_RL32(X+((5 + 3*i) & 15));\
a += (c ^ (b | ~d)) + AV_RL32(X+(( 7*i) & 15));\
} \
a = b + (a << t | a >> (32 - t)); \
} while (0)
static const uint32_t T[64]
Definition: md5.c:60
static const uint8_t S[4][4]
Definition: md5.c:53
Definition: vf_addroi.c:26
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define b
Definition: input.c:41
if(ret)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87

Definition at line 82 of file md5.c.

Referenced by body().

#define CORE2 (   i)
Value:
CORE(i, a, b, c, d); CORE((i + 1), d, a, b, c); \
CORE((i + 2), c, d, a, b); CORE((i + 3), b, c, d, a)
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define b
Definition: input.c:41
#define CORE(i, a, b, c, d)
Definition: md5.c:82
#define CORE4 (   i)    CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12))

Referenced by body().

Function Documentation

static void body ( uint32_t  ABCD[4],
const uint8_t src,
int  nblocks 
)
static

Definition at line 101 of file md5.c.

Referenced by av_md5_update(), and http_write_reply().

Variable Documentation

const uint8_t S[4][4]
static
Initial value:
= {
{ 7, 12, 17, 22 },
{ 5, 9, 14, 20 },
{ 4, 11, 16, 23 },
{ 6, 10, 15, 21 }
}

Definition at line 53 of file md5.c.

const uint32_t T[64]
static
Initial value:
= {
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
}

Definition at line 60 of file md5.c.