diff --git a/src/actions/transformations/sha1.cc b/src/actions/transformations/sha1.cc
index 684e5f96..04d49d4d 100644
--- a/src/actions/transformations/sha1.cc
+++ b/src/actions/transformations/sha1.cc
@@ -24,6 +24,8 @@
 
 #include "modsecurity/assay.h"
 #include "actions/transformations/transformation.h"
+#include "utils/sha1.h"
+#include "src/utils.h"
 
 
 namespace ModSecurity {
@@ -37,15 +39,12 @@ Sha1::Sha1(std::string action)
 
 std::string Sha1::evaluate(std::string value,
     Assay *assay) {
-    /**
-     * @todo Implement the transformation Sha1
-     */
-    if (assay) {
-#ifndef NO_LOGS
-        assay->debug(4, "Transformation Sha1 is not implemented yet.");
-#endif
-    }
-    return value;
+
+    Utils::SHA1 sha1;
+    sha1.update(&value);
+    std::string sha1_bin = sha1.final_bin();
+
+    return sha1_bin;
 }
 
 }  // namespace transformations
diff --git a/src/utils/sha1.cc b/src/utils/sha1.cc
index c029b806..bb7d10c1 100644
--- a/src/utils/sha1.cc
+++ b/src/utils/sha1.cc
@@ -65,7 +65,7 @@ void SHA1::update(std::istream *is) {
 }
 
 
-std::string SHA1::final() {
+std::string SHA1::final_bin(bool toReset = true) {
     /* Total number of hashed bits */
     uint64_t total_bits = (transforms*BLOCK_BYTES + buffer.size()) * 8;
 
@@ -91,6 +91,22 @@ std::string SHA1::final() {
     block[BLOCK_INTS - 2] = (total_bits >> 32);
     transform(block);
 
+    if (toReset) {
+        /* Reset for next run */
+        reset();
+    }
+
+    std::string bin;
+    bin.append((const char*) digest, BLOCK_INTS);
+
+    return bin;
+}
+
+
+std::string SHA1::final() {
+
+    final_bin(false);
+
     /* Hex std::string */
     std::ostringstream result;
     for (unsigned int i = 0; i < DIGEST_INTS; i++) {
diff --git a/src/utils/sha1.h b/src/utils/sha1.h
index e1b42e97..5ac3a6e4 100644
--- a/src/utils/sha1.h
+++ b/src/utils/sha1.h
@@ -47,6 +47,10 @@ class SHA1 {
     void update(std::string *s);
     void update(std::istream *is);
     std::string final();
+    std::string final_bin() {
+        return final_bin(true);
+    }
+    std::string final_bin(bool reset);
 
  private:
     /* number of 32bit integers per SHA1 digest */