Fix Dataview Offsets

src/groth16_prover.js

@@ -104,7 +104,7 @@ async function buldABC(curve, zkey, witness, coeffs) {
     const sCoef = 4*3 + zkey.n8r;
 
     const elementsPerChunk = Math.floor(zkey.domainSize/concurrency);
-    const coeffsDV = new DataView(coeffs.buffer);
+    const coeffsDV = new DataView(coeffs.buffer, coeffs.byteOffset, coeffs.byteLength);
     const promises = [];
 
     const cutPoints = [];

src/misc.js

@@ -36,7 +36,7 @@ function log2( V )
 
 
 function formatHash(b) {
-    const a = new DataView(b.buffer);
+    const a = new DataView(b.buffer, b.byteOffset, b.byteLength);
     let S = "";
     for (let i=0; i<4; i++) {
         if (i>0) S += "\n";

src/powersoftau_utils.js

@@ -362,7 +362,7 @@ function keyFromBeacon(curve, challangeHash, beaconHash, numIterationsExp) {
         }
     }
 
-    const curHashV = new DataView(curHash.buffer);
+    const curHashV = new DataView(curHash.buffer, curHash.byteOffset, curHash.byteLength);
     const seed = [];
     for (let i=0; i<8; i++) {
         seed[i] = curHashV.getUint32(i*4, false);

src/zkey_export_bellman.js

@@ -117,7 +117,7 @@ module.exports  = async function phase2exportMPCParams(zkeyName, mpcparamsName,
         }
 
         const buffSize = new Uint8Array(4);
-        const buffSizeV = new DataView(buffSize.buffer);
+        const buffSizeV = new DataView(buffSize.buffer, buffSize.byteOffset, buffSize.byteLength);
         buffSizeV.setUint32(0, buff.byteLength / sG, false);
 
         await fdMPCParams.write(buffSize);
@@ -126,7 +126,7 @@ module.exports  = async function phase2exportMPCParams(zkeyName, mpcparamsName,
 
     async function writeU32(n) {
         const buffSize = new Uint8Array(4);
-        const buffSizeV = new DataView(buffSize.buffer);
+        const buffSizeV = new DataView(buffSize.buffer, buffSize.byteOffset, buffSize.byteLength);
         buffSizeV.setUint32(0, n, false);
 
         await fdMPCParams.write(buffSize);

src/zkey_new.js

@@ -471,7 +471,7 @@ module.exports  = async function phase2new(r1csName, ptauName, zkeyName, verbose
 
     function hashU32(n) {
         const buff = new Uint8Array(4);
-        const buffV = new DataView(buff.buffer);
+        const buffV = new DataView(buff.buffer, buff.byteOffset, buff.byteLength);
         buffV.setUint32(0, n, false);
         csHasher.update(buff);
     }