From de9f8867d5141940f47951c51648becec74959cb Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Thu, 21 Nov 2019 23:10:17 +0100
Subject: missing files / native encode/decode

---
 src/crypto/nativeCrypto-test.ts |  32 +++++++++
 src/crypto/nativeCrypto.ts      | 140 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 172 insertions(+)
 create mode 100644 src/crypto/nativeCrypto-test.ts
 create mode 100644 src/crypto/nativeCrypto.ts

(limited to 'src/crypto')

diff --git a/src/crypto/nativeCrypto-test.ts b/src/crypto/nativeCrypto-test.ts
new file mode 100644
index 000000000..7b9fcf256
--- /dev/null
+++ b/src/crypto/nativeCrypto-test.ts
@@ -0,0 +1,32 @@
+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Imports
+ */
+import test from "ava";
+import { encodeCrock, decodeCrock } from "./nativeCrypto";
+
+
+test("encoding", (t) => {
+  const utf8decoder = new TextDecoder("utf-8");
+  const utf8encoder = new TextEncoder();
+  const s = "Hello, World";
+  const encStr = encodeCrock(utf8encoder.encode(s));
+  const outBuf = decodeCrock(encStr);
+  const sOut = utf8decoder.decode(outBuf);
+  t.deepEqual(s, sOut);
+});
\ No newline at end of file
diff --git a/src/crypto/nativeCrypto.ts b/src/crypto/nativeCrypto.ts
new file mode 100644
index 000000000..853ece6c7
--- /dev/null
+++ b/src/crypto/nativeCrypto.ts
@@ -0,0 +1,140 @@
+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Native implementation of GNU Taler crypto.
+ */
+
+let isNode;
+
+let myGetRandom: (n: number) => ArrayBuffer;
+
+if (require) {
+  // node.js
+  const cr = require("crypto");
+  myGetRandom = (n: number) => {
+    const buf = cr.randomBytes(n);
+    return Uint8Array.from(buf);
+  }
+} else {
+  // Browser
+  myGetRandom = (n: number) => {
+    const ret = new Uint8Array(n);
+    window.crypto.getRandomValues(ret);
+    return ret;
+  }
+}
+
+export function getRandomBytes(n: number): ArrayBuffer {
+  return myGetRandom(n);
+}
+
+const encTable = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
+
+class EncodingError extends Error {
+  constructor() {
+    super("Encoding error");
+    Object.setPrototypeOf(this, EncodingError.prototype);
+  }
+}
+
+function getValue(chr: string): number {
+  let a = chr;
+  switch (chr) {
+    case "O":
+    case "o":
+      a = "0;";
+      break;
+    case "i":
+    case "I":
+    case "l":
+    case "L":
+      a = "1";
+      break;
+    case "u":
+    case "U":
+      a = "V";
+  }
+
+  if (a >= "0" && a <= "9") {
+    return a.charCodeAt(0) - "0".charCodeAt(0);
+  }
+
+  if (a >= "a" && a <= "z") a = a.toUpperCase();
+  let dec = 0;
+  if (a >= "A" && a <= "Z") {
+    if ("I" < a) dec++;
+    if ("L" < a) dec++;
+    if ("O" < a) dec++;
+    if ("U" < a) dec++;
+    return a.charCodeAt(0) - "A".charCodeAt(0) + 10 - dec;
+  }
+  throw new EncodingError();
+}
+
+export function encodeCrock(data: ArrayBuffer): string {
+  const dataBytes = new Uint8Array(data);
+  let sb = "";
+  const size = data.byteLength;
+  let bitBuf = 0;
+  let numBits = 0;
+  let pos = 0;
+  while (pos < size || numBits > 0) {
+    if (pos < size && numBits < 5) {
+      const d = dataBytes[pos++];
+      bitBuf = (bitBuf << 8) | d;
+      numBits += 8;
+    }
+    if (numBits < 5) {
+      // zero-padding
+      bitBuf = bitBuf << (5 - numBits);
+      numBits = 5;
+    }
+    const v = (bitBuf >>> (numBits - 5)) & 31;
+    sb += encTable[v];
+    numBits -= 5;
+  }
+  return sb;
+}
+
+export function decodeCrock(encoded: string): ArrayBuffer {
+  const size = encoded.length;
+  let bitpos = 0;
+  let bitbuf = 0;
+  let readPosition = 0;
+  const outLen = Math.floor((size * 5) / 8);
+  const out = new Int8Array(outLen);
+  let outPos = 0;
+
+  while (readPosition < size || bitpos > 0) {
+    //println("at position $readPosition with bitpos $bitpos")
+    if (readPosition < size) {
+      const v = getValue(encoded[readPosition++]);
+      bitbuf = (bitbuf << 5) | v;
+      bitpos += 5;
+    }
+    while (bitpos >= 8) {
+      const d = (bitbuf >>> (bitpos - 8)) & 0xff;
+      out[outPos++] = d;
+      bitpos -= 8;
+    }
+    if (readPosition == size && bitpos > 0) {
+      bitbuf = (bitbuf << (8 - bitpos)) & 0xff;
+      bitpos = bitbuf == 0 ? 0 : 8;
+    }
+  }
+  return out;
+}
-- 
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