diff --git a/circuits/barry.jaz b/circuits/barry.jaz
deleted file mode 100644
index 3a22548..0000000
--- a/circuits/barry.jaz
+++ /dev/null
@@ -1,43 +0,0 @@
-
-
-
-template AND() {
-    signal input a;
-    signal input b;
-    signal output c;
-
-    c <== a*b;
-}
-
-template AND3() {
-    signal input in1;
-    signal input in2;
-    signal input in3;
-    signal output out;
-
-    component and1 = AND();
-    component and2 = AND();
-
-    in1 ==> and1.a;
-    in2 ==> and1.b;
-    in3 ==> and2.a;
-    and1.c ==> and2.b;
-    and2.c ==> out;
-}
-
-template ToBin() {
-    signal input in;
-    signal output out[32];
-
-    var lc = 0;
-
-    for (var i=0; i<32; i++) {
-        out[i] <-- (in >> i) & 1;
-        lc = lc + out[i] * 2**i;
-        out[i]*(out[i]-1) === 0;
-    }
-
-    lc === in;
-}
-
-component main = ToBin();
diff --git a/circuits/sha256/gates.jaz b/circuits/gates.circom
similarity index 100%
rename from circuits/sha256/gates.jaz
rename to circuits/gates.circom
diff --git a/circuits/jose.jaz b/circuits/jose.jaz
deleted file mode 100644
index 28b9aff..0000000
--- a/circuits/jose.jaz
+++ /dev/null
@@ -1,11 +0,0 @@
-template AND() {
-    signal input s1;
-    signal input s2;
-    signal output s3;
-
-    s3 <== s1*s2;
-    s1*(s1-1) === 0;
-    s2*(s2-1) === 0;
-}
-
-component main = AND();
diff --git a/circuits/multiplexer.jaz b/circuits/multiplexer.circom
similarity index 100%
rename from circuits/multiplexer.jaz
rename to circuits/multiplexer.circom
diff --git a/circuits/sha256/binsum.jaz b/circuits/sha256/binsum.circom
similarity index 100%
rename from circuits/sha256/binsum.jaz
rename to circuits/sha256/binsum.circom
diff --git a/circuits/sha256/bitify.jaz b/circuits/sha256/bitify.circom
similarity index 100%
rename from circuits/sha256/bitify.jaz
rename to circuits/sha256/bitify.circom
diff --git a/circuits/sha256/constants.jaz b/circuits/sha256/constants.circom
similarity index 100%
rename from circuits/sha256/constants.jaz
rename to circuits/sha256/constants.circom
diff --git a/circuits/sha256/input_h0.json b/circuits/sha256/input_h0.json
deleted file mode 100644
index 602c80c..0000000
--- a/circuits/sha256/input_h0.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-	"in": "0xd807aa98"
-}
diff --git a/circuits/sha256/main.jaz b/circuits/sha256/main.circom
similarity index 100%
rename from circuits/sha256/main.jaz
rename to circuits/sha256/main.circom
diff --git a/circuits/sha256/rotate.jaz b/circuits/sha256/rotate.circom
similarity index 100%
rename from circuits/sha256/rotate.jaz
rename to circuits/sha256/rotate.circom
diff --git a/circuits/sha256/sha256_2.jaz b/circuits/sha256/sha256_2.circom
similarity index 100%
rename from circuits/sha256/sha256_2.jaz
rename to circuits/sha256/sha256_2.circom
diff --git a/circuits/sha256/sha256compression.jaz b/circuits/sha256/sha256compression.circom
similarity index 100%
rename from circuits/sha256/sha256compression.jaz
rename to circuits/sha256/sha256compression.circom
diff --git a/circuits/sha256/sigma.jaz b/circuits/sha256/sigma.circom
similarity index 100%
rename from circuits/sha256/sigma.jaz
rename to circuits/sha256/sigma.circom
diff --git a/circuits/sha256/sigmaplus.jaz b/circuits/sha256/sigmaplus.circom
similarity index 100%
rename from circuits/sha256/sigmaplus.jaz
rename to circuits/sha256/sigmaplus.circom
diff --git a/circuits/sha256/t1.jaz b/circuits/sha256/t1.circom
similarity index 100%
rename from circuits/sha256/t1.jaz
rename to circuits/sha256/t1.circom
diff --git a/circuits/sha256/t2.jaz b/circuits/sha256/t2.circom
similarity index 100%
rename from circuits/sha256/t2.jaz
rename to circuits/sha256/t2.circom
diff --git a/circuits/tobin.jaz b/circuits/tobin.circom
similarity index 100%
rename from circuits/tobin.jaz
rename to circuits/tobin.circom
diff --git a/circuits/sha256/constants_test.jaz b/test/circuits/constants_test.circom
similarity index 82%
rename from circuits/sha256/constants_test.jaz
rename to test/circuits/constants_test.circom
index 1712b84..61d392d 100644
--- a/circuits/sha256/constants_test.jaz
+++ b/test/circuits/constants_test.circom
@@ -1,4 +1,4 @@
-include "constants.jaz"
+include "../../circuits/sha256/constants.circom"
 
 template A() {
     signal input in;
diff --git a/test/circuits/constants_test.jaz b/test/circuits/constants_test.jaz
deleted file mode 100644
index 8170ae3..0000000
--- a/test/circuits/constants_test.jaz
+++ /dev/null
@@ -1,18 +0,0 @@
-include "../../circuits/sha256/constants.jaz"
-
-template A() {
-    signal input in;
-    component h0;
-    h0 = K(8);
-
-    var lc = 0;
-    var e = 1;
-    for (var i=0; i<32; i++) {
-        lc = lc + e*h0.out[i];
-        e *= 2;
-    }
-
-    lc === in;
-}
-
-component main = A();
diff --git a/test/circuits/sum_test.jaz b/test/circuits/sum_test.circom
similarity index 83%
rename from test/circuits/sum_test.jaz
rename to test/circuits/sum_test.circom
index 7d3467c..9ab2b70 100644
--- a/test/circuits/sum_test.jaz
+++ b/test/circuits/sum_test.circom
@@ -1,5 +1,5 @@
-include "bitify.jaz"
-include "binsum.jaz"
+include "../../circuits/sha256/bitify.circom"
+include "../../circuits/sha256/binsum.circom"
 
 template A() {
     signal private input a;
diff --git a/circuits/sha256/input_sum_test.json b/test/input_sum_test.json
similarity index 100%
rename from circuits/sha256/input_sum_test.json
rename to test/input_sum_test.json
diff --git a/test/sha256.js b/test/sha256.js
index 00d33c3..8393896 100644
--- a/test/sha256.js
+++ b/test/sha256.js
@@ -9,7 +9,7 @@ const assert = chai.assert;
 describe("SHA256 test", () => {
     it("Should create a constant circuit", async () => {
 
-        const cirDef = await compiler(path.join(__dirname, "circuits", "constants_test.jaz"));
+        const cirDef = await compiler(path.join(__dirname, "circuits", "constants_test.circom"));
         assert.equal(cirDef.nVars, 2);
 
         const circuit = new zkSnark.Circuit(cirDef);
@@ -19,4 +19,18 @@ describe("SHA256 test", () => {
         assert(witness[0].equals(zkSnark.bigInt(1)));
         assert(witness[1].equals(zkSnark.bigInt("0xd807aa98")));
     });
+    it("Should create a sum circuit", async () => {
+
+        const cirDef = await compiler(path.join(__dirname, "circuits", "sum_test.circom"));
+        assert.equal(cirDef.nVars, 101);
+
+        const circuit = new zkSnark.Circuit(cirDef);
+
+        const witness = circuit.calculateWitness({ "a": "111", "b": "222" });
+
+        assert(witness[0].equals(zkSnark.bigInt(1)));
+        assert(witness[1].equals(zkSnark.bigInt("333")));
+    });
+
+
 });