Add tests for low R signing

package-lock.json

@@ -731,9 +731,9 @@
       "dev": true
     },
     "nan": {
-      "version": "2.12.1",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.12.1.tgz",
-      "integrity": "sha512-JY7V6lRkStKcKTvHO5NVSQRv+RV+FIL5pvDoLiAtSL9pKlC5x9PKQcZDsq7m4FO4d57mkhC6Z+QhAh3Jdk5JFw=="
+      "version": "2.13.2",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.13.2.tgz",
+      "integrity": "sha512-TghvYc72wlMGMVMluVo9WRJc0mB8KxxF/gZ4YYFy7V2ZQX9l7rgbPg7vjS9mt6U5HXODVFVI2bOduCzwOMv/lw=="
     },
     "nyc": {
       "version": "13.3.0",
@@ -1911,15 +1911,15 @@
       }
     },
     "tiny-secp256k1": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/tiny-secp256k1/-/tiny-secp256k1-1.0.1.tgz",
-      "integrity": "sha512-Wz2kMPWtCI5XBftFeF3bUL8uz2+VlasniKwOkRPjvL7h1QVd9rbhrve/HWUu747kJKzVf1XHonzcdM4Ut8fvww==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/tiny-secp256k1/-/tiny-secp256k1-1.1.0.tgz",
+      "integrity": "sha512-DIl0SCUIVcPrk/oOiq8/YgQ69Beayw4XSW2icyXJN8xfKMmxo5XM8gXVG1Ex+rYsHg2xuEpNFeeU6J4CtqQFrA==",
       "requires": {
         "bindings": "^1.3.0",
         "bn.js": "^4.11.8",
         "create-hmac": "^1.1.7",
         "elliptic": "^6.4.0",
-        "nan": "^2.10.0"
+        "nan": "^2.12.1"
       }
     },
     "to-fast-properties": {

package.json

@@ -53,7 +53,7 @@
     "merkle-lib": "^2.0.10",
     "pushdata-bitcoin": "^1.0.1",
     "randombytes": "^2.0.1",
-    "tiny-secp256k1": "^1.0.0",
+    "tiny-secp256k1": "^1.1.0",
     "typeforce": "^1.11.3",
     "varuint-bitcoin": "^1.0.4",
     "wif": "^2.0.1"

test/ecpair.js

@@ -259,4 +259,26 @@ describe('ECPair', () => {
       }))
     })
   })
+  describe('optional low R signing', () => {
+    const sig = Buffer.from('95a6619140fca3366f1d3b013b0367c4f86e39508a50fdce' +
+      'e5245fbb8bd60aa6086449e28cf15387cf9f85100bfd0838624ca96759e59f65c10a00' +
+      '16b86f5229', 'hex')
+    const sigLowR = Buffer.from('6a2660c226e8055afad317eeba918a304be79208d505' +
+      '3bc5ea4a5e4c5892b4a061c717c5284ae5202d721c0e49b4717b79966280906b1d3b52' +
+      '95d1fdde963c35', 'hex')
+    const lowRKeyPair = ECPair.fromWIF('L3nThUzbAwpUiBAjR5zCu66ybXSPMr2zZ3ikp' +
+      'ScpTPiYTxBynfZu')
+    const dataToSign = Buffer.from('b6c5c548a7f6164c8aa7af5350901626ebd69f9ae' +
+      '2c1ecf8871f5088ec204cfe', 'hex')
+
+    it('signs with normal R by default', () => {
+      const signed = lowRKeyPair.sign(dataToSign)
+      assert.deepStrictEqual(sig, signed)
+    })
+
+    it('signs with low R when true is passed', () => {
+      const signed = lowRKeyPair.sign(dataToSign, true)
+      assert.deepStrictEqual(sigLowR, signed)
+    })
+  })
 })