Add require on safe-buffer dependency to fix Buffer undefined error when ran in a browser.

index.js

@@ -2,6 +2,7 @@
 
 var BN = require('bn.js');
 var randomBytes = require('randombytes');
+var Buffer = require('safe-buffer').Buffer;
 
 function getr(priv) {
 	var len = priv.modulus.byteLength();

package.json

@@ -30,7 +30,8 @@
 	},
 	"dependencies": {
 		"bn.js": "^5.2.1",
-		"randombytes": "^2.1.0"
+		"randombytes": "^2.1.0",
+		"safe-buffer": "^5.2.1"
 	},
 	"devDependencies": {
 		"@ljharb/eslint-config": "^21.1.1",

test/index.js

@@ -4,7 +4,9 @@ var crypto = require('crypto');
 var constants = require('constants');
 var parseKey = require('parse-asn1');
 var BN = require('bn.js');
+var Buffer = require('safe-buffer').Buffer;
 var test = require('tape');
+
 var crt = require('../');
 
 var fixtures = require('./fixtures');