OAuth & SSH Keygen

pkcs1To8.js

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+/* eslint no-bitwise: 0 */
+
+function wrap(text, len) {
+    const length = len || 72;
+    let result = "";
+    for (let i = 0; i < text.length; i += length) {
+      result += text.slice(i, i + length);
+      result += "\n";
+    }
+    return result;
+  }
+  
+  function pemPrivateKey(key) {
+    return `-----BEGIN PRIVATE KEY-----\n${wrap(key, 64)}-----END PRIVATE KEY-----`;
+  }
+  
+  function stripPemFormatting(str) {
+    return str
+      .replace(/^-----BEGIN (?:RSA )?(?:PRIVATE|PUBLIC) KEY-----$/m, "")
+      .replace(/^-----END (?:RSA )?(?:PRIVATE|PUBLIC) KEY-----$/m, "")
+      .replace(/[\n\r]/g, "");
+  }
+  function arrayToPem(a) {
+    return window.btoa(a.map(c => String.fromCharCode(c)).join(""));
+  }
+  
+  function stringToArray(s) {
+    return s.split("").map(c => c.charCodeAt());
+  }
+  
+  function pemToArray(pem) {
+    return stringToArray(window.atob(pem));
+  }
+  
+  const prefix = [
+    0x30,
+    0x82,
+    0x04,
+    0xbc,
+    0x02,
+    0x01,
+    0x00,
+    0x30,
+    0x0d,
+    0x06,
+    0x09,
+    0x2a,
+    0x86,
+    0x48,
+    0x86,
+    0xf7,
+    0x0d,
+    0x01,
+    0x01,
+    0x01,
+    0x05,
+    0x00,
+    0x04,
+    0x82,
+    0x04,
+    0xa6,
+  ];
+  
+  function pkcs1To8(privateKeyPkcs1Pem) {
+    const pem = stripPemFormatting(privateKeyPkcs1Pem);
+    const privateKeyPkcs1Array = pemToArray(pem);
+    const prefixPkcs8 = prefix.concat(privateKeyPkcs1Array);
+    const privateKeyPkcs8Pem = arrayToPem(prefixPkcs8);
+    const pkcs8Pem = pemPrivateKey(privateKeyPkcs8Pem);
+    return pkcs8Pem;
+  }
+  
+  // crypto.subtle.importKey(
+  //   "spki",
+  //   keyTextBuffer,
+  //   {
+  //     name: "RSASSA-PKCS1-v1_5",
+  //     hash: { name: "SHA-256" },
+  //   },
+  //   true,
+  //   ["verify"]
+  // );
+  
+  module.exports = { pkcs1To8 };