Fixed md5 buffer not being correctly zero-initialized and refactored code. (#2507)

1 files changed, 253 insertions, 298 deletions

diff --git a/indra/llcommon/llmd5.cpp b/indra/llcommon/llmd5.cpp
index f64f54c262..e999b8f597 100644
--- a/indra/llcommon/llmd5.cpp
+++ b/indra/llcommon/llmd5.cpp
@@ -68,10 +68,6 @@ documentation and/or software.
 
  */
 
-
-
-
-
 #include "linden_common.h"
 
 #include "llmd5.h"
@@ -81,232 +77,203 @@ documentation and/or software.
 // how many bytes to grab at a time when checking files
 const int LLMD5::BLOCK_LEN = 4096;
 
-
 // LLMD5 simple initialization method
-
 LLMD5::LLMD5()
 {
-  init();
+    init();
 }
 
-
-
-
 // MD5 block update operation. Continues an MD5 message-digest
 // operation, processing another message block, and updating the
 // context.
+void LLMD5::update(const uint8_t* input, const size_t input_length)
+{
+    size_t input_index, buffer_index;
+    size_t buffer_space; // how much space is left in buffer
 
-void LLMD5::update (const uint8_t *input, const size_t input_length) {
-
-  size_t input_index, buffer_index;
-  size_t buffer_space;                // how much space is left in buffer
-
-  if (finalized){  // so we can't update!
-      std::cerr << "LLMD5::update:  Can't update a finalized digest!" << std::endl;
-    return;
-  }
-
-  // Compute number of bytes mod 64
-  buffer_index = size_t((count >> 3) & 0x3F);
+    if (finalized)
+    { // so we can't update!
+        std::cerr << "LLMD5::update:  Can't update a finalized digest!" << std::endl;
+        return;
+    }
 
-  // Update number of bits
-  count += input_length << 3;
+    // Compute number of bytes mod 64
+    buffer_index = size_t((count >> 3) & 0x3F);
 
-  buffer_space = 64 - buffer_index;  // how much space is left in buffer
+    // Update number of bits
+    count += input_length << 3;
 
-  // now, transform each 64-byte piece of the input, bypassing the buffer
-  if (input == NULL || input_length == 0){
-      std::cerr << "LLMD5::update:  Invalid input!" << std::endl;
-      return;
-  }
+    buffer_space = 64 - buffer_index; // how much space is left in buffer
 
-  // Transform as many times as possible.
-  if (input_length >= buffer_space) { // ie. we have enough to fill the buffer
-    // fill the rest of the buffer and transform
-    memcpy( /* Flawfinder: ignore */
-        buffer + buffer_index,
-        input,
-        buffer_space);
-    transform (buffer);
+    // now, transform each 64-byte piece of the input, bypassing the buffer
+    if (input == NULL || input_length == 0)
+    {
+        std::cerr << "LLMD5::update:  Invalid input!" << std::endl;
+        return;
+    }
 
-    for (input_index = buffer_space; input_index + 63 < input_length;
-     input_index += 64)
-      transform (input+input_index);
+    // Transform as many times as possible.
+    if (input_length >= buffer_space) // ie. we have enough to fill the buffer
+    {
+        // fill the rest of the buffer and transform
+        memcpy(/* Flawfinder: ignore */
+               buffer + buffer_index,
+               input,
+               buffer_space);
+        transform(buffer);
 
-    buffer_index = 0;  // so we can buffer remaining
-  }
-  else
-    input_index=0;     // so we can buffer the whole input
+        for (input_index = buffer_space; input_index + 63 < input_length; input_index += 64)
+            transform(input + input_index);
 
+        buffer_index = 0; // so we can buffer remaining
+    }
+    else
+        input_index = 0; // so we can buffer the whole input
 
-  // and here we do the buffering:
-  memcpy(buffer+buffer_index, input+input_index, input_length-input_index);     /* Flawfinder: ignore */
+    // and here we do the buffering:
+    memcpy(buffer + buffer_index, input + input_index, input_length - input_index); /* Flawfinder: ignore */
 }
 
-
-
 // MD5 update for files.
 // Like above, except that it works on files (and uses above as a primitive.)
+void LLMD5::update(FILE* file)
+{
+    unsigned char buffer[BLOCK_LEN]; /* Flawfinder: ignore */
+    int len;
 
-void LLMD5::update(FILE* file){
-
-  unsigned char buffer[BLOCK_LEN];      /* Flawfinder: ignore */
-  int len;
-
-  while ( (len=(int)fread(buffer, 1, BLOCK_LEN, file)) )
-    update(buffer, len);
-
-  fclose (file);
+    while ((len = (int)fread(buffer, 1, BLOCK_LEN, file)))
+        update(buffer, len);
 
+    fclose(file);
 }
 
 // MD5 update for istreams.
 // Like update for files; see above.
+void LLMD5::update(std::istream& stream)
+{
+    unsigned char buffer[BLOCK_LEN]; /* Flawfinder: ignore */
+    int len;
 
-void LLMD5::update(std::istream& stream){
-
-  unsigned char buffer[BLOCK_LEN];      /* Flawfinder: ignore */
-  int len;
-
-  while (stream.good()){
-    stream.read( (char*)buffer, BLOCK_LEN);     /* Flawfinder: ignore */        // note that return value of read is unusable.
-    len=(int)stream.gcount();
-    update(buffer, len);
-  }
-
+    while (stream.good())
+    {
+        stream.read((char*)buffer, BLOCK_LEN); /* Flawfinder: ignore */ // note that return value of read is unusable.
+        len = (int)stream.gcount();
+        update(buffer, len);
+    }
 }
 
-void  LLMD5::update(const std::string& s)
+void LLMD5::update(const std::string& s)
 {
-    update((unsigned char *)s.c_str(),s.length());
+    update((unsigned char*)s.c_str(), s.length());
 }
 
 // MD5 finalization. Ends an MD5 message-digest operation, writing the
 // the message digest and zeroizing the context.
-
-
-void LLMD5::finalize (){
-
-  unsigned char bits[8];        /* Flawfinder: ignore */
-  size_t index, padLen;
-  static uint8_t PADDING[64]={
-    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+void LLMD5::finalize()
+{
+    unsigned char bits[8]; /* Flawfinder: ignore */
+    size_t index, padLen;
+    static uint8_t PADDING[64] =
+    {
+        0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
     };
 
-  if (finalized){
-    std::cerr << "LLMD5::finalize:  Already finalized this digest!" << std::endl;
-    return;
-  }
-
-  // Save number of bits.
-  // Treat count, a uint64_t, as uint32_t[2].
-  encode (bits, reinterpret_cast<uint32_t*>(&count), 8);
+    if (finalized)
+    {
+        std::cerr << "LLMD5::finalize:  Already finalized this digest!" << std::endl;
+        return;
+    }
 
-  // Pad out to 56 mod 64.
-  index = size_t((count >> 3) & 0x3f);
-  padLen = (index < 56) ? (56 - index) : (120 - index);
-  update (PADDING, padLen);
+    // Save number of bits.
+    // Treat count, a uint64_t, as uint32_t[2].
+    encode(bits, reinterpret_cast<uint32_t*>(&count), 8);
 
-  // Append length (before padding)
-  update (bits, 8);
+    // Pad out to 56 mod 64.
+    index  = size_t((count >> 3) & 0x3f);
+    padLen = (index < 56) ? (56 - index) : (120 - index);
+    update(PADDING, padLen);
 
-  // Store state in digest
-  encode (digest, state, 16);
+    // Append length (before padding)
+    update(bits, 8);
 
-  // Zeroize sensitive information
-  memset (buffer, 0, sizeof(*buffer));
+    // Store state in digest
+    encode(digest, state, 16);
 
-  finalized=1;
+    // Zeroize sensitive information
+    memset(buffer, 0, sizeof(buffer));
 
+    finalized = true;
 }
 
-
-
-
-LLMD5::LLMD5(FILE *file){
-
-  init();  // must be called be all constructors
-  update(file);
-  finalize ();
+LLMD5::LLMD5(FILE* file)
+{
+    init(); // must be called be all constructors
+    update(file);
+    finalize();
 }
 
-
-
-
-LLMD5::LLMD5(std::istream& stream){
-
-  init();  // must called by all constructors
-  update (stream);
-  finalize();
+LLMD5::LLMD5(std::istream& stream)
+{
+    init(); // must called by all constructors
+    update(stream);
+    finalize();
 }
 
 // Digest a string of the format ("%s:%i" % (s, number))
-LLMD5::LLMD5(const unsigned char *string, const unsigned int number)
+LLMD5::LLMD5(const unsigned char* string, const unsigned int number)
 {
-    const char *colon = ":";
-    char tbuf[16];      /* Flawfinder: ignore */
+    const char* colon = ":";
+    char tbuf[16]; /* Flawfinder: ignore */
     init();
-    update(string, (U32)strlen((const char *) string));     /* Flawfinder: ignore */
-    update((const unsigned char *) colon, (U32)strlen(colon));      /* Flawfinder: ignore */
-    snprintf(tbuf, sizeof(tbuf), "%i", number); /* Flawfinder: ignore */
-    update((const unsigned char *) tbuf, (U32)strlen(tbuf));    /* Flawfinder: ignore */
+    update(string, (U32)strlen((const char*)string));        /* Flawfinder: ignore */
+    update((const unsigned char*)colon, (U32)strlen(colon)); /* Flawfinder: ignore */
+    snprintf(tbuf, sizeof(tbuf), "%i", number);              /* Flawfinder: ignore */
+    update((const unsigned char*)tbuf, (U32)strlen(tbuf));   /* Flawfinder: ignore */
     finalize();
 }
 
 // Digest a string
-LLMD5::LLMD5(const unsigned char *s)
+LLMD5::LLMD5(const unsigned char* s)
 {
     init();
-    update(s, (U32)strlen((const char *) s));       /* Flawfinder: ignore */
+    update(s, (U32)strlen((const char*)s)); /* Flawfinder: ignore */
     finalize();
 }
 
-void LLMD5::raw_digest(unsigned char *s) const
+void LLMD5::raw_digest(unsigned char* s) const
 {
     if (!finalized)
     {
-        std::cerr << "LLMD5::raw_digest:  Can't get digest if you haven't "<<
-            "finalized the digest!" << std::endl;
+        std::cerr << "LLMD5::raw_digest:  Can't get digest if you haven't "
+                  << "finalized the digest!" << std::endl;
         s[0] = '\0';
         return;
     }
 
-    memcpy(s, digest, 16);      /* Flawfinder: ignore */
-    return;
+    memcpy(s, digest, 16); /* Flawfinder: ignore */
 }
 
-
-
-void LLMD5::hex_digest(char *s) const
+void LLMD5::hex_digest(char* s) const
 {
-    int i;
-
     if (!finalized)
     {
-        std::cerr << "LLMD5::hex_digest:  Can't get digest if you haven't "<<
-          "finalized the digest!" <<std::endl;
+        std::cerr << "LLMD5::hex_digest:  Can't get digest if you haven't "
+                  << "finalized the digest!" << std::endl;
         s[0] = '\0';
         return;
     }
 
-    for (i=0; i<16; i++)
+    for (int i = 0; i < 16; i++)
     {
-        sprintf(s+i*2, "%02x", digest[i]);      /* Flawfinder: ignore */
+        sprintf(s + i * 2, "%02x", digest[i]); /* Flawfinder: ignore */
     }
 
-    s[32]='\0';
-
-    return;
+    s[32] = '\0';
 }
 
-
-
-
-
-
-std::ostream& operator<<(std::ostream &stream, LLMD5 context)
+std::ostream& operator<<(std::ostream& stream, const LLMD5& context)
 {
     char s[33];     /* Flawfinder: ignore */
     context.hex_digest(s);
@@ -320,7 +287,7 @@ bool operator==(const LLMD5& a, const LLMD5& b)
     unsigned char b_guts[16];
     a.raw_digest(a_guts);
     b.raw_digest(b_guts);
-    if (memcmp(a_guts,b_guts,16)==0)
+    if (memcmp(a_guts, b_guts, 16) == 0)
         return true;
     else
         return false;
@@ -328,30 +295,27 @@ bool operator==(const LLMD5& a, const LLMD5& b)
 
 bool operator!=(const LLMD5& a, const LLMD5& b)
 {
-    return !(a==b);
+    return !(a == b);
 }
 
 // PRIVATE METHODS:
+void LLMD5::init()
+{
+    finalized = false; // we just started!
 
-void LLMD5::init(){
-  finalized=0;  // we just started!
-
-  // Nothing counted, so count=0
-  count = 0;
+    // Nothing counted, so count=0
+    count = 0;
 
-  // Load magic initialization constants.
-  state[0] = 0x67452301;
-  state[1] = 0xefcdab89;
-  state[2] = 0x98badcfe;
-  state[3] = 0x10325476;
+    // Load magic initialization constants.
+    state[0] = 0x67452301;
+    state[1] = 0xefcdab89;
+    state[2] = 0x98badcfe;
+    state[3] = 0x10325476;
 }
 
-
-
 // Constants for MD5Transform routine.
 // Although we could use C++ style constants, defines are actually better,
 // since they let us easily evade scope clashes.
-
 #define S11 7
 #define S12 12
 #define S13 17
@@ -381,153 +345,144 @@ void LLMD5::init(){
 
 /* ROTATE_LEFT rotates x left n bits.
  */
-#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
 
 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
 Rotation is separate from addition to prevent recomputation.
  */
-#define FF(a, b, c, d, x, s, ac) { \
- (a) += F ((b), (c), (d)) + (x) + (U32)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
-  }
-#define GG(a, b, c, d, x, s, ac) { \
- (a) += G ((b), (c), (d)) + (x) + (U32)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
-  }
-#define HH(a, b, c, d, x, s, ac) { \
- (a) += H ((b), (c), (d)) + (x) + (U32)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
-  }
-#define II(a, b, c, d, x, s, ac) { \
- (a) += I ((b), (c), (d)) + (x) + (U32)(ac); \
- (a) = ROTATE_LEFT ((a), (s)); \
- (a) += (b); \
-  }
-
-
+#define FF(a, b, c, d, x, s, ac)                   \
+    {                                              \
+        (a) += F((b), (c), (d)) + (x) + (U32)(ac); \
+        (a) = ROTATE_LEFT((a), (s));               \
+        (a) += (b);                                \
+    }
+#define GG(a, b, c, d, x, s, ac)                   \
+    {                                              \
+        (a) += G((b), (c), (d)) + (x) + (U32)(ac); \
+        (a) = ROTATE_LEFT((a), (s));               \
+        (a) += (b);                                \
+    }
+#define HH(a, b, c, d, x, s, ac)                   \
+    {                                              \
+        (a) += H((b), (c), (d)) + (x) + (U32)(ac); \
+        (a) = ROTATE_LEFT((a), (s));               \
+        (a) += (b);                                \
+    }
+#define II(a, b, c, d, x, s, ac)                   \
+    {                                              \
+        (a) += I((b), (c), (d)) + (x) + (U32)(ac); \
+        (a) = ROTATE_LEFT((a), (s));               \
+        (a) += (b);                                \
+    }
 
 // LLMD5 basic transformation. Transforms state based on block.
-void LLMD5::transform (const U8 block[64]){
-
-  uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
-
-  decode (x, block, 64);
-
-  assert(!finalized);  // not just a user error, since the method is private
-
-  /* Round 1 */
-  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
-  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
-  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
-  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
-  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
-  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
-  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
-  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
-  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
-  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
-  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
-  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
-  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
-  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
-  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
-  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
-
- /* Round 2 */
-  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
-  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
-  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
-  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
-  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
-  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
-  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
-  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
-  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
-  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
-  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
-  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
-  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
-  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
-  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
-  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
-
-  /* Round 3 */
-  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
-  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
-  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
-  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
-  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
-  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
-  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
-  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
-  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
-  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
-  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
-  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
-  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
-  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
-  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
-  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
-
-  /* Round 4 */
-  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
-  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
-  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
-  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
-  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
-  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
-  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
-  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
-  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
-  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
-  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
-  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
-  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
-  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
-  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
-  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
-
-  state[0] += a;
-  state[1] += b;
-  state[2] += c;
-  state[3] += d;
-
-  // Zeroize sensitive information.
-  memset ( (uint8_t *) x, 0, sizeof(x));
-
+void LLMD5::transform(const U8 block[64])
+{
+    uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+
+    decode(x, block, 64);
+
+    assert(!finalized); // not just a user error, since the method is private
+
+    /* Round 1 */
+    FF(a, b, c, d, x[0], S11, 0xd76aa478);  /* 1 */
+    FF(d, a, b, c, x[1], S12, 0xe8c7b756);  /* 2 */
+    FF(c, d, a, b, x[2], S13, 0x242070db);  /* 3 */
+    FF(b, c, d, a, x[3], S14, 0xc1bdceee);  /* 4 */
+    FF(a, b, c, d, x[4], S11, 0xf57c0faf);  /* 5 */
+    FF(d, a, b, c, x[5], S12, 0x4787c62a);  /* 6 */
+    FF(c, d, a, b, x[6], S13, 0xa8304613);  /* 7 */
+    FF(b, c, d, a, x[7], S14, 0xfd469501);  /* 8 */
+    FF(a, b, c, d, x[8], S11, 0x698098d8);  /* 9 */
+    FF(d, a, b, c, x[9], S12, 0x8b44f7af);  /* 10 */
+    FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+    FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+    FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+    FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+    FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+    FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+
+    /* Round 2 */
+    GG(a, b, c, d, x[1], S21, 0xf61e2562);  /* 17 */
+    GG(d, a, b, c, x[6], S22, 0xc040b340);  /* 18 */
+    GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+    GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);  /* 20 */
+    GG(a, b, c, d, x[5], S21, 0xd62f105d);  /* 21 */
+    GG(d, a, b, c, x[10], S22, 0x2441453);  /* 22 */
+    GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+    GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);  /* 24 */
+    GG(a, b, c, d, x[9], S21, 0x21e1cde6);  /* 25 */
+    GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+    GG(c, d, a, b, x[3], S23, 0xf4d50d87);  /* 27 */
+    GG(b, c, d, a, x[8], S24, 0x455a14ed);  /* 28 */
+    GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+    GG(d, a, b, c, x[2], S22, 0xfcefa3f8);  /* 30 */
+    GG(c, d, a, b, x[7], S23, 0x676f02d9);  /* 31 */
+    GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+    /* Round 3 */
+    HH(a, b, c, d, x[5], S31, 0xfffa3942);  /* 33 */
+    HH(d, a, b, c, x[8], S32, 0x8771f681);  /* 34 */
+    HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+    HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+    HH(a, b, c, d, x[1], S31, 0xa4beea44);  /* 37 */
+    HH(d, a, b, c, x[4], S32, 0x4bdecfa9);  /* 38 */
+    HH(c, d, a, b, x[7], S33, 0xf6bb4b60);  /* 39 */
+    HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+    HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+    HH(d, a, b, c, x[0], S32, 0xeaa127fa);  /* 42 */
+    HH(c, d, a, b, x[3], S33, 0xd4ef3085);  /* 43 */
+    HH(b, c, d, a, x[6], S34, 0x4881d05);   /* 44 */
+    HH(a, b, c, d, x[9], S31, 0xd9d4d039);  /* 45 */
+    HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+    HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+    HH(b, c, d, a, x[2], S34, 0xc4ac5665);  /* 48 */
+
+    /* Round 4 */
+    II(a, b, c, d, x[0], S41, 0xf4292244);  /* 49 */
+    II(d, a, b, c, x[7], S42, 0x432aff97);  /* 50 */
+    II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+    II(b, c, d, a, x[5], S44, 0xfc93a039);  /* 52 */
+    II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+    II(d, a, b, c, x[3], S42, 0x8f0ccc92);  /* 54 */
+    II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+    II(b, c, d, a, x[1], S44, 0x85845dd1);  /* 56 */
+    II(a, b, c, d, x[8], S41, 0x6fa87e4f);  /* 57 */
+    II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+    II(c, d, a, b, x[6], S43, 0xa3014314);  /* 59 */
+    II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+    II(a, b, c, d, x[4], S41, 0xf7537e82);  /* 61 */
+    II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+    II(c, d, a, b, x[2], S43, 0x2ad7d2bb);  /* 63 */
+    II(b, c, d, a, x[9], S44, 0xeb86d391);  /* 64 */
+
+    state[0] += a;
+    state[1] += b;
+    state[2] += c;
+    state[3] += d;
+
+    // Zeroize sensitive information.
+    memset(x, 0, sizeof(x));
 }
 
-
-
 // Encodes input (uint32_t) into output (unsigned char). Assumes len is
 // a multiple of 4.
-void LLMD5::encode (uint8_t *output, const uint32_t *input, const size_t len) {
-
-  size_t i, j;
-
-  for (i = 0, j = 0; j < len; i++, j += 4) {
-    output[j]   = (uint8_t)  (input[i] & 0xff);
-    output[j+1] = (uint8_t) ((input[i] >> 8) & 0xff);
-    output[j+2] = (uint8_t) ((input[i] >> 16) & 0xff);
-    output[j+3] = (uint8_t) ((input[i] >> 24) & 0xff);
-  }
+void LLMD5::encode(uint8_t* output, const uint32_t* input, const size_t len)
+{
+    for (size_t i = 0, j = 0; j < len; i++, j += 4)
+    {
+        output[j] = (uint8_t)(input[i] & 0xff);
+        output[j + 1] = (uint8_t)((input[i] >> 8) & 0xff);
+        output[j + 2] = (uint8_t)((input[i] >> 16) & 0xff);
+        output[j + 3] = (uint8_t)((input[i] >> 24) & 0xff);
+    }
 }
 
-
-
-
 // Decodes input (unsigned char) into output (uint32_t). Assumes len is
 // a multiple of 4.
-void LLMD5::decode (uint32_t *output, const uint8_t *input, const size_t len){
-
-  size_t i, j;
-
-  for (i = 0, j = 0; j < len; i++, j += 4)
-    output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
-      (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
+void LLMD5::decode(uint32_t* output, const uint8_t* input, const size_t len)
+{
+    for (size_t i = 0, j = 0; j < len; i++, j += 4)
+        output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
+        (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
 }
-
-