MD5 Class Reference

#include <MD5.h>

Collaboration diagram for MD5:

Classes
struct	Context

Public Member Functions
	MD5 (const unsigned char *buffer, unsigned long len)
	MD5 (const char *buffer, size_t len)
	MD5 (const std::string &buffer)
void	raw_digest (unsigned char *s) const
void	uuid_digest (uuid_t &uuid) const
std::string	hex_digest () const

Private Types
typedef uint32_t	MD5_u32plus

Private Member Functions
void	init ()
void	update (const void *data, size_t size)
void	digest (unsigned char *result)
const void *	body (const void *data, size_t size)

Private Attributes
Context	m_ctx
unsigned char	m_digest [16]

Detailed Description

Definition at line 19 of file MD5.h.

Member Typedef Documentation

MD5_u32plus

typedef uint32_t MD5::MD5_u32plus

private

Definition at line 30 of file MD5.h.

Constructor & Destructor Documentation

MD5() [1/3]

MD5::MD5	(	const unsigned char *	buffer,
		unsigned long	len
	)

Definition at line 56 of file MD5.cxx.

{
  init();
  update (buffer, len);
  digest (m_digest);
}

MD5() [2/3]

MD5::MD5	(	const char *	buffer,
		size_t	len
	)

Definition at line 65 of file MD5.cxx.

{
  init();
  update (buffer, len);
  digest (m_digest);
}

MD5() [3/3]

MD5::MD5

(

const std::string &

buffer

)

Definition at line 74 of file MD5.cxx.

{
  init();
  update (s.c_str(), s.size());
  digest (m_digest);
}

Member Function Documentation

body()

const void * MD5::body ( const void *  data, size_t  size  )

private

Definition at line 161 of file MD5.cxx.

{
    const unsigned char *ptr;
    MD5_u32plus a, b, c, d;
    MD5_u32plus saved_a, saved_b, saved_c, saved_d;
        Context* ctx = &m_ctx;
 
    ptr = (const unsigned char *)data;
 
    a = ctx->a;
    b = ctx->b;
    c = ctx->c;
    d = ctx->d;
 
    do {
        saved_a = a;
        saved_b = b;
        saved_c = c;
        saved_d = d;
 
/* Round 1 */
        STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
        STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
        STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
        STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
        STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
        STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
        STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
        STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
        STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
        STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
        STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
        STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
        STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
        STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
        STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
        STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
 
/* Round 2 */
        STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
        STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
        STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
        STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
        STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
        STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
        STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
        STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
        STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
        STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
        STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
        STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
        STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
        STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
        STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
        STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
 
/* Round 3 */
        STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
        STEP(H2, d, a, b, c, GET(8), 0x8771f681, 11)
        STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
        STEP(H2, b, c, d, a, GET(14), 0xfde5380c, 23)
        STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
        STEP(H2, d, a, b, c, GET(4), 0x4bdecfa9, 11)
        STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
        STEP(H2, b, c, d, a, GET(10), 0xbebfbc70, 23)
        STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
        STEP(H2, d, a, b, c, GET(0), 0xeaa127fa, 11)
        STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
        STEP(H2, b, c, d, a, GET(6), 0x04881d05, 23)
        STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
        STEP(H2, d, a, b, c, GET(12), 0xe6db99e5, 11)
        STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
        STEP(H2, b, c, d, a, GET(2), 0xc4ac5665, 23)
 
/* Round 4 */
        STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
        STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
        STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
        STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
        STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
        STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
        STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
        STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
        STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
        STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
        STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
        STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
        STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
        STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
        STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
        STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
 
        a += saved_a;
        b += saved_b;
        c += saved_c;
        d += saved_d;
 
        ptr += 64;
    } while (size -= 64);
 
    ctx->a = a;
    ctx->b = b;
    ctx->c = c;
    ctx->d = d;
 
    return ptr;
}

digest()

void MD5::digest ( unsigned char *  result )

private

Definition at line 322 of file MD5.cxx.

{
    unsigned long used, available;
        Context* ctx = &m_ctx;
 
    used = ctx->lo & 0x3f;
 
    ctx->buffer[used++] = 0x80;
 
    available = 64 - used;
 
    if (available < 8) {
        memset(&ctx->buffer[used], 0, available);
        body(ctx->buffer, 64);
        used = 0;
        available = 64;
    }
 
    memset(&ctx->buffer[used], 0, available - 8);
 
    ctx->lo <<= 3;
        // cppcheck-suppress objectIndex
    OUT(&ctx->buffer[56], ctx->lo)
        // cppcheck-suppress objectIndex
    OUT(&ctx->buffer[60], ctx->hi)
 
    body(ctx->buffer, 64);
 
    OUT(&result[0], ctx->a)
    OUT(&result[4], ctx->b)
    OUT(&result[8], ctx->c)
    OUT(&result[12], ctx->d)
 
    memset(ctx, 0, sizeof(*ctx));
}

hex_digest()

std::string MD5::hex_digest

(

)

const

Definition at line 94 of file MD5.cxx.

{
  char s[33];
  for (int i = 0; i < 16; i++) {
    snprintf (s+i*2, 3, "%02x", m_digest[i]);
  }
  s[32] = '\0';
  return s;
}

init()

void MD5::init ( )

private

Definition at line 269 of file MD5.cxx.

{
        Context* ctx = &m_ctx;
    ctx->a = 0x67452301;
    ctx->b = 0xefcdab89;
    ctx->c = 0x98badcfe;
    ctx->d = 0x10325476;
 
    ctx->lo = 0;
    ctx->hi = 0;
}

raw_digest()

void MD5::raw_digest

(

unsigned char *

s

)

const

Definition at line 82 of file MD5.cxx.

{
  memcpy (s, m_digest, 16);
}

update()

void MD5::update ( const void *  data, size_t  size  )

private

Definition at line 281 of file MD5.cxx.

{
    MD5_u32plus saved_lo;
    unsigned long used, available;
        Context* ctx = &m_ctx;
 
    saved_lo = ctx->lo;
    if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
        ctx->hi++;
    ctx->hi += size >> 29;
 
    used = saved_lo & 0x3f;
 
    if (used) {
        available = 64 - used;
 
        if (size < available) {
            memcpy(&ctx->buffer[used], data, size);
            return;
        }
 
        memcpy(&ctx->buffer[used], data, available);
        data = (const unsigned char *)data + available;
        size -= available;
        body(ctx->buffer, 64);
    }
 
    if (size >= 64) {
        data = body(data, size & ~(unsigned long)0x3f);
        size &= 0x3f;
    }
 
    memcpy(ctx->buffer, data, size);
}

uuid_digest()

void MD5::uuid_digest

(

uuid_t &

uuid

)

const

Definition at line 88 of file MD5.cxx.

{
  memcpy (&uuid, m_digest, 16);
}

Member Data Documentation

m_ctx

Context MD5::m_ctx

private

Definition at line 38 of file MD5.h.

m_digest

unsigned char MD5::m_digest[16]

private

Definition at line 39 of file MD5.h.

---

The documentation for this class was generated from the following files:

• MD5.h
• MD5.cxx