diff --git a/headers/modsecurity/assay.h b/headers/modsecurity/assay.h
index 295fa7f4..5ed23953 100644
--- a/headers/modsecurity/assay.h
+++ b/headers/modsecurity/assay.h
@@ -152,6 +152,7 @@ class Assay {
     int httpCodeReturned;
 
     std::string to_json(int parts);
+    std::string toOldAuditLogFormat(int parts, const std::string &trailer);
 
     std::string id;
     time_t timeStamp;
diff --git a/src/assay.cc b/src/assay.cc
index a2316ede..83d747d6 100644
--- a/src/assay.cc
+++ b/src/assay.cc
@@ -688,6 +688,95 @@ ModSecurityIntervention *Assay::intervention() {
 }
 
 
+std::string Assay::toOldAuditLogFormat(int parts, const std::string &trailer) {
+    std::stringstream audit_log;
+    struct tm timeinfo;
+    char tstr[300];
+
+    memset(tstr, '\0', 300);
+    localtime_r(&this->timeStamp, &timeinfo);
+
+    audit_log << "--" << trailer << "-" << "A--" << std::endl;
+    strftime(tstr, 299, "[%d/%b/%Y:%H:%M:%S %z]", &timeinfo);
+    audit_log << tstr;
+    audit_log << " " << this->id.c_str();
+    audit_log << " " << this->m_clientIpAddress;
+    audit_log << " " << this->m_clientPort;
+    audit_log << " " << this->m_serverIpAddress;
+    audit_log << " " << this->m_serverPort;
+    audit_log << std::endl;
+
+    if (parts & AuditLog::BAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "B--" << std::endl;
+        audit_log << this->m_protocol << " " << this->m_uri << " " << "HTTP/";
+        audit_log << this->m_httpVersion << std::endl;
+
+        for (auto h : this->m_variables_strings) {
+            std::string filter = "REQUEST_HEADERS:";
+            std::string a = h.first;
+            std::string b = h.second;
+
+            if (a.compare(0, filter.length(), filter) == 0) {
+                if (a.length() > filter.length()) {
+                    audit_log << a.c_str() + filter.length() << ": ";
+                    audit_log << b.c_str() << std::endl;
+                }
+            }
+        }
+    }
+    if (parts & AuditLog::CAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "C--" << std::endl;
+        /** TODO: write audit_log C part. */
+    }
+    if (parts & AuditLog::DAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "D--" << std::endl;
+        /** TODO: write audit_log D part. */
+    }
+    if (parts & AuditLog::EAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "E--" << std::endl;
+        /** TODO: write audit_log E part. */
+    }
+    if (parts & AuditLog::FAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "F--" << std::endl;
+        for (auto h : this->m_variables_strings) {
+            std::string filter = "RESPONSE_HEADERS:";
+            std::string a = h.first;
+            std::string b = h.second;
+
+            if (a.compare(0, filter.length(), filter) == 0) {
+                if (a.length() > filter.length()) {
+                    audit_log << a.c_str() + filter.length() << ": ";
+                    audit_log << b.c_str() << std::endl;
+                }
+            }
+        }
+    }
+    if (parts & AuditLog::GAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "G--" << std::endl;
+        /** TODO: write audit_log G part. */
+    }
+    if (parts & AuditLog::HAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "H--" << std::endl;
+        /** TODO: write audit_log H part. */
+    }
+    if (parts & AuditLog::IAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "I--" << std::endl;
+        /** TODO: write audit_log I part. */
+    }
+    if (parts & AuditLog::JAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "J--" << std::endl;
+        /** TODO: write audit_log J part. */
+    }
+    if (parts & AuditLog::KAuditLogPart) {
+        audit_log << "--" << trailer << "-" << "K--" << std::endl;
+        /** TODO: write audit_log K part. */
+    }
+    audit_log << "--" << trailer << "-" << "Z--" << std::endl << std::endl;
+
+    return audit_log.str();
+}
+
+
 std::string Assay::to_json(int parts) {
     const unsigned char *buf;
     size_t len;
diff --git a/src/audit_log_writer_serial.cc b/src/audit_log_writer_serial.cc
index 78c2c746..90cd5a4f 100644
--- a/src/audit_log_writer_serial.cc
+++ b/src/audit_log_writer_serial.cc
@@ -15,21 +15,46 @@
 
 #include "src/audit_log_writer_serial.h"
 
+#include <mutex>
+
 #include "src/audit_log.h"
 
 namespace ModSecurity {
 
+static std::mutex serialLoggingMutex;
 
-AuditLogWriterSerial::~AuditLogWriterSerial()
-{ }
+
+AuditLogWriterSerial::~AuditLogWriterSerial() {
+    log.close();
+}
+
+
+void AuditLogWriterSerial::generateBoundary(std::string *boundary) {
+    static const char alphanum[] =
+        "0123456789"
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        "abcdefghijklmnopqrstuvwxyz";
+
+    for (int i = 0; i < SERIAL_AUDIT_LOG_BOUNDARY_LENGTH; ++i) {
+        boundary->append(1, alphanum[rand() % (sizeof(alphanum) - 1)]);
+    }
+}
 
 
 bool AuditLogWriterSerial::init() {
+    log.open(m_audit->m_path1, std::fstream::out | std::fstream::app);
     return true;
 }
 
 
 bool AuditLogWriterSerial::write(Assay *assay, int parts) {
+    std::string boundary;
+
+    generateBoundary(&boundary);
+
+    serialLoggingMutex.lock();
+    log << assay->toOldAuditLogFormat(parts, "-" + boundary + "--");
+    serialLoggingMutex.unlock();
     return true;
 }
 
diff --git a/src/audit_log_writer_serial.h b/src/audit_log_writer_serial.h
index 197dd4c7..02e24f22 100644
--- a/src/audit_log_writer_serial.h
+++ b/src/audit_log_writer_serial.h
@@ -29,6 +29,8 @@
 
 namespace ModSecurity {
 
+#define SERIAL_AUDIT_LOG_BOUNDARY_LENGTH 8
+
 /** @ingroup ModSecurity_CPP_API */
 class AuditLogWriterSerial : public AuditLogWriter {
  public:
@@ -51,6 +53,10 @@ class AuditLogWriterSerial : public AuditLogWriter {
 
     bool init() override;;
     bool write(Assay *assay, int parts) override;
+
+ private:
+    std::ofstream log;
+    void generateBoundary(std::string *boundary);
 };
 
 }  // namespace ModSecurity
diff --git a/src/utils/md5.cc b/src/utils/md5.cc
new file mode 100644
index 00000000..aff9645b
--- /dev/null
+++ b/src/utils/md5.cc
@@ -0,0 +1,362 @@
+/* MD5
+ converted to C++ class by Frank Thilo (thilo@unix-ag.org)
+ for bzflag (http://www.bzflag.org)
+ 
+   based on:
+ 
+   md5.h and md5.c
+   reference implemantion of RFC 1321
+ 
+   Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+ 
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+ 
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+ 
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+ 
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ 
+*/
+ 
+/* interface header */
+#include "md5.h"
+ 
+/* system implementation headers */
+#include <cstdio>
+ 
+ 
+// Constants for MD5Transform routine.
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+ 
+///////////////////////////////////////////////
+ 
+// F, G, H and I are basic MD5 functions.
+inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) {
+  return x&y | ~x&z;
+}
+ 
+inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) {
+  return x&z | y&~z;
+}
+ 
+inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) {
+  return x^y^z;
+}
+ 
+inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) {
+  return y ^ (x | ~z);
+}
+ 
+// rotate_left rotates x left n bits.
+inline MD5::uint4 MD5::rotate_left(uint4 x, int n) {
+  return (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.
+inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
+  a = rotate_left(a+ F(b,c,d) + x + ac, s) + b;
+}
+ 
+inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
+  a = rotate_left(a + G(b,c,d) + x + ac, s) + b;
+}
+ 
+inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
+  a = rotate_left(a + H(b,c,d) + x + ac, s) + b;
+}
+ 
+inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
+  a = rotate_left(a + I(b,c,d) + x + ac, s) + b;
+}
+ 
+//////////////////////////////////////////////
+ 
+// default ctor, just initailize
+MD5::MD5()
+{
+  init();
+}
+ 
+//////////////////////////////////////////////
+ 
+// nifty shortcut ctor, compute MD5 for string and finalize it right away
+MD5::MD5(const std::string &text)
+{
+  init();
+  update(text.c_str(), text.length());
+  finalize();
+}
+ 
+//////////////////////////////
+ 
+void MD5::init()
+{
+  finalized=false;
+ 
+  count[0] = 0;
+  count[1] = 0;
+ 
+  // load magic initialization constants.
+  state[0] = 0x67452301;
+  state[1] = 0xefcdab89;
+  state[2] = 0x98badcfe;
+  state[3] = 0x10325476;
+}
+ 
+//////////////////////////////
+ 
+// decodes input (unsigned char) into output (uint4). Assumes len is a multiple of 4.
+void MD5::decode(uint4 output[], const uint1 input[], size_type len)
+{
+  for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
+    output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) |
+      (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24);
+}
+ 
+//////////////////////////////
+ 
+// encodes input (uint4) into output (unsigned char). Assumes len is
+// a multiple of 4.
+void MD5::encode(uint1 output[], const uint4 input[], size_type len)
+{
+  for (size_type i = 0, j = 0; j < len; i++, j += 4) {
+    output[j] = input[i] & 0xff;
+    output[j+1] = (input[i] >> 8) & 0xff;
+    output[j+2] = (input[i] >> 16) & 0xff;
+    output[j+3] = (input[i] >> 24) & 0xff;
+  }
+}
+ 
+//////////////////////////////
+ 
+// apply MD5 algo on a block
+void MD5::transform(const uint1 block[blocksize])
+{
+  uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
+  decode (x, block, blocksize);
+ 
+  /* 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);
+}
+ 
+//////////////////////////////
+ 
+// MD5 block update operation. Continues an MD5 message-digest
+// operation, processing another message block
+void MD5::update(const unsigned char input[], size_type length)
+{
+  // compute number of bytes mod 64
+  size_type index = count[0] / 8 % blocksize;
+ 
+  // Update number of bits
+  if ((count[0] += (length << 3)) < (length << 3))
+    count[1]++;
+  count[1] += (length >> 29);
+ 
+  // number of bytes we need to fill in buffer
+  size_type firstpart = 64 - index;
+ 
+  size_type i;
+ 
+  // transform as many times as possible.
+  if (length >= firstpart)
+  {
+    // fill buffer first, transform
+    memcpy(&buffer[index], input, firstpart);
+    transform(buffer);
+ 
+    // transform chunks of blocksize (64 bytes)
+    for (i = firstpart; i + blocksize <= length; i += blocksize)
+      transform(&input[i]);
+ 
+    index = 0;
+  }
+  else
+    i = 0;
+ 
+  // buffer remaining input
+  memcpy(&buffer[index], &input[i], length-i);
+}
+ 
+//////////////////////////////
+ 
+// for convenience provide a verson with signed char
+void MD5::update(const char input[], size_type length)
+{
+  update((const unsigned char*)input, length);
+}
+ 
+//////////////////////////////
+ 
+// MD5 finalization. Ends an MD5 message-digest operation, writing the
+// the message digest and zeroizing the context.
+MD5& MD5::finalize()
+{
+  static unsigned char 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) {
+    // Save number of bits
+    unsigned char bits[8];
+    encode(bits, count, 8);
+ 
+    // pad out to 56 mod 64.
+    size_type index = count[0] / 8 % 64;
+    size_type padLen = (index < 56) ? (56 - index) : (120 - index);
+    update(padding, padLen);
+ 
+    // Append length (before padding)
+    update(bits, 8);
+ 
+    // Store state in digest
+    encode(digest, state, 16);
+ 
+    // Zeroize sensitive information.
+    memset(buffer, 0, sizeof buffer);
+    memset(count, 0, sizeof count);
+ 
+    finalized=true;
+  }
+ 
+  return *this;
+}
+ 
+//////////////////////////////
+ 
+// return hex representation of digest as string
+std::string MD5::hexdigest() const
+{
+  if (!finalized)
+    return "";
+ 
+  char buf[33];
+  for (int i=0; i<16; i++)
+    sprintf(buf+i*2, "%02x", digest[i]);
+  buf[32]=0;
+ 
+  return std::string(buf);
+}
+ 
+//////////////////////////////
+ 
+std::ostream& operator<<(std::ostream& out, MD5 md5)
+{
+  return out << md5.hexdigest();
+}
+ 
+//////////////////////////////
+ 
+std::string md5(const std::string str)
+{
+    MD5 md5 = MD5(str);
+ 
+    return md5.hexdigest();
+}
\ No newline at end of file
diff --git a/src/utils/md5.h b/src/utils/md5.h
new file mode 100644
index 00000000..443895db
--- /dev/null
+++ b/src/utils/md5.h
@@ -0,0 +1,93 @@
+/* MD5
+ converted to C++ class by Frank Thilo (thilo@unix-ag.org)
+ for bzflag (http://www.bzflag.org)
+ 
+   based on:
+ 
+   md5.h and md5.c
+   reference implementation of RFC 1321
+ 
+   Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+rights reserved.
+ 
+License to copy and use this software is granted provided that it
+is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+Algorithm" in all material mentioning or referencing this software
+or this function.
+ 
+License is also granted to make and use derivative works provided
+that such works are identified as "derived from the RSA Data
+Security, Inc. MD5 Message-Digest Algorithm" in all material
+mentioning or referencing the derived work.
+ 
+RSA Data Security, Inc. makes no representations concerning either
+the merchantability of this software or the suitability of this
+software for any particular purpose. It is provided "as is"
+without express or implied warranty of any kind.
+ 
+These notices must be retained in any copies of any part of this
+documentation and/or software.
+ 
+*/
+ 
+#ifndef BZF_MD5_H
+#define BZF_MD5_H
+ 
+#include <cstring>
+#include <iostream>
+ 
+ 
+// a small class for calculating MD5 hashes of strings or byte arrays
+// it is not meant to be fast or secure
+//
+// usage: 1) feed it blocks of uchars with update()
+//      2) finalize()
+//      3) get hexdigest() string
+//      or
+//      MD5(std::string).hexdigest()
+//
+// assumes that char is 8 bit and int is 32 bit
+class MD5
+{
+public:
+  typedef unsigned int size_type; // must be 32bit
+ 
+  MD5();
+  MD5(const std::string& text);
+  void update(const unsigned char *buf, size_type length);
+  void update(const char *buf, size_type length);
+  MD5& finalize();
+  std::string hexdigest() const;
+  friend std::ostream& operator<<(std::ostream&, MD5 md5);
+ 
+private:
+  void init();
+  typedef unsigned char uint1; //  8bit
+  typedef unsigned int uint4;  // 32bit
+  enum {blocksize = 64}; // VC6 won't eat a const static int here
+ 
+  void transform(const uint1 block[blocksize]);
+  static void decode(uint4 output[], const uint1 input[], size_type len);
+  static void encode(uint1 output[], const uint4 input[], size_type len);
+ 
+  bool finalized;
+  uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk
+  uint4 count[2];   // 64bit counter for number of bits (lo, hi)
+  uint4 state[4];   // digest so far
+  uint1 digest[16]; // the result
+ 
+  // low level logic operations
+  static inline uint4 F(uint4 x, uint4 y, uint4 z);
+  static inline uint4 G(uint4 x, uint4 y, uint4 z);
+  static inline uint4 H(uint4 x, uint4 y, uint4 z);
+  static inline uint4 I(uint4 x, uint4 y, uint4 z);
+  static inline uint4 rotate_left(uint4 x, int n);
+  static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+  static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
+};
+ 
+std::string md5(const std::string str);
+ 
+#endif
\ No newline at end of file
diff --git a/test/test-cases/regression/auditlog.json b/test/test-cases/regression/auditlog.json
index 926b9e24..59e47e48 100644
--- a/test/test-cases/regression/auditlog.json
+++ b/test/test-cases/regression/auditlog.json
@@ -54,6 +54,67 @@
       "SecAuditLogStorageDir /tmp/test",
       "SecAuditLogDirMode 0766",
       "SecAuditLogFileMode 0600",
+      "SecAuditLogType Parallel",
+      "SecAuditLogRelevantStatus \"^(?:5|4(?!04))\""
+    ]
+  },
+  {
+    "enabled": 1,
+    "version_min": 300000,
+    "version_max": 0,
+    "title": "auditlog : basic parser test - serial",
+    "client": {
+      "ip": "200.249.12.31",
+      "port": 2313
+    },
+    "server": {
+      "ip": "200.249.12.31",
+      "port": 80
+    },
+    "request": {
+      "headers": {
+        "Host": "www.modsecurity.org",
+        "User-Agent": "Mozilla\/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko\/20091102 Firefox\/3.5.5 (.NET CLR 3.5.30729)",
+        "Accept": "text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8",
+        "Accept-Language": "en-us,en;q=0.5",
+        "Accept-Encoding": "gzip,deflate",
+        "Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
+        "Keep-Alive": "300",
+        "Connection": "keep-alive",
+        "Pragma": "no-cache",
+        "Cache-Control": "no-cache"
+      },
+      "uri": "\/test.pl?param1=   test   &param2=test2",
+      "protocol": "GET",
+      "http_version": 1.1,
+      "body": ""
+    },
+    "response": {
+      "headers": {
+        "Content-Type": "plain\/text\n\r"
+      },
+      "body": [
+        "test"
+      ]
+    },
+    "expected": {
+      "audit_log": "",
+      "debug_log": "\\[9\\]  T \\(0\\) trim: \"test\"",
+      "error_log": "",
+      "http_code": 403
+    },
+    "rules": [
+      "SecRuleEngine On",
+      "SecDebugLog \/tmp\/modsec_debug.log",
+      "SecDebugLogLevel 9",
+      "SecRule ARGS \"@contains test\" \"t:trim,block,auditlog\"",
+      "SecAuditEngine RelevantOnly",
+      "SecAuditLogParts ABCFHZ",
+      "SecAuditLogStorageDir /tmp/test",
+      "SecAuditLog /tmp/audit_test.log",
+      "SecAuditLogDirMode 0766",
+      "SecAuditLogFileMode 0600",
+      "SecAuditLogType Serial",
       "SecAuditLogRelevantStatus \"^(?:5|4(?!04))\""
     ]
   }