[taler-wallet-core] 01/03: changed implementation of bech32 to https://github.com/sipa/bech32/tree/master/ref/javascript

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sebasjm pushed a commit to branch master
in repository wallet-core.

commit 7d8acca7f948ded5f188e2fb9af6b0a11f9c0572
Author: Sebastian <sebasjm@gmail.com>
AuthorDate: Thu Mar 3 17:49:28 2022 -0300

    changed implementation of bech32 to 
https://github.com/sipa/bech32/tree/master/ref/javascript
---
 packages/taler-util/package.json       |   1 -
 packages/taler-util/src/bech32.ts      | 131 +++++++++++++++++++++++++++++++++
 packages/taler-util/src/bitcoin.ts     |  15 ++--
 packages/taler-util/src/segwit_addr.ts |  91 +++++++++++++++++++++++
 4 files changed, 232 insertions(+), 6 deletions(-)

diff --git a/packages/taler-util/package.json b/packages/taler-util/package.json
index b1edbaf8..6a46de89 100644
--- a/packages/taler-util/package.json
+++ b/packages/taler-util/package.json
@@ -40,7 +40,6 @@
     "typescript": "^4.5.5"
   },
   "dependencies": {
-    "bech32-buffer": "^0.2.0",
     "big-integer": "^1.6.51",
     "jed": "^1.1.1",
     "tslib": "^2.3.1"
diff --git a/packages/taler-util/src/bech32.ts 
b/packages/taler-util/src/bech32.ts
new file mode 100644
index 00000000..03c24e80
--- /dev/null
+++ b/packages/taler-util/src/bech32.ts
@@ -0,0 +1,131 @@
+// Copyright (c) 2017, 2021 Pieter Wuille
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to 
deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+var CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
+var GENERATOR = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
+
+const encodings: any = {
+  BECH32: "bech32",
+  BECH32M: "bech32m",
+};
+
+export default {
+  decode: decode,
+  encode: encode,
+  encodings: encodings,
+};
+
+function getEncodingConst(enc: any) {
+  if (enc == encodings.BECH32) {
+    return 1;
+  } else if (enc == encodings.BECH32M) {
+    return 0x2bc830a3;
+  } else {
+    throw new Error('unknown encoding')
+  }
+}
+
+function polymod(values: any) {
+  var chk = 1;
+  for (var p = 0; p < values.length; ++p) {
+    var top = chk >> 25;
+    chk = (chk & 0x1ffffff) << 5 ^ values[p];
+    for (var i = 0; i < 5; ++i) {
+      if ((top >> i) & 1) {
+        chk ^= GENERATOR[i];
+      }
+    }
+  }
+  return chk;
+}
+
+function hrpExpand(hrp: any) {
+  var ret = [];
+  var p;
+  for (p = 0; p < hrp.length; ++p) {
+    ret.push(hrp.charCodeAt(p) >> 5);
+  }
+  ret.push(0);
+  for (p = 0; p < hrp.length; ++p) {
+    ret.push(hrp.charCodeAt(p) & 31);
+  }
+  return ret;
+}
+
+function verifyChecksum(hrp: any, data: any, enc: any) {
+  return polymod(hrpExpand(hrp).concat(data)) === getEncodingConst(enc);
+}
+
+function createChecksum(hrp: any, data: any, enc: any) {
+  var values = hrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
+  var mod = polymod(values) ^ getEncodingConst(enc);
+  var ret = [];
+  for (var p = 0; p < 6; ++p) {
+    ret.push((mod >> 5 * (5 - p)) & 31);
+  }
+  return ret;
+}
+
+function encode(hrp: any, data: any, enc: any): string {
+  var combined = data.concat(createChecksum(hrp, data, enc));
+  var ret = hrp + '1';
+  for (var p = 0; p < combined.length; ++p) {
+    ret += CHARSET.charAt(combined[p]);
+  }
+  return ret;
+}
+
+function decode(bechString: any, enc: any) {
+  var p;
+  var has_lower = false;
+  var has_upper = false;
+  for (p = 0; p < bechString.length; ++p) {
+    if (bechString.charCodeAt(p) < 33 || bechString.charCodeAt(p) > 126) {
+      return null;
+    }
+    if (bechString.charCodeAt(p) >= 97 && bechString.charCodeAt(p) <= 122) {
+      has_lower = true;
+    }
+    if (bechString.charCodeAt(p) >= 65 && bechString.charCodeAt(p) <= 90) {
+      has_upper = true;
+    }
+  }
+  if (has_lower && has_upper) {
+    return null;
+  }
+  bechString = bechString.toLowerCase();
+  var pos = bechString.lastIndexOf('1');
+  if (pos < 1 || pos + 7 > bechString.length || bechString.length > 90) {
+    return null;
+  }
+  var hrp = bechString.substring(0, pos);
+  var data = [];
+  for (p = pos + 1; p < bechString.length; ++p) {
+    var d = CHARSET.indexOf(bechString.charAt(p));
+    if (d === -1) {
+      return null;
+    }
+    data.push(d);
+  }
+  if (!verifyChecksum(hrp, data, enc)) {
+    return null;
+  }
+  return { hrp: hrp, data: data.slice(0, data.length - 6) };
+}
\ No newline at end of file
diff --git a/packages/taler-util/src/bitcoin.ts 
b/packages/taler-util/src/bitcoin.ts
index dd90f514..f4d3cfeb 100644
--- a/packages/taler-util/src/bitcoin.ts
+++ b/packages/taler-util/src/bitcoin.ts
@@ -17,7 +17,7 @@
 import { AmountJson } from "."
 import { Amounts, } from "./amounts"
 import { getRandomBytes, decodeCrock, encodeCrock } from "./talerCrypto"
-import { encode as segwitEncode } from "bech32-buffer"
+import * as segwit from "./segwit_addr"
 /**
  *
  * @author sebasjm
@@ -34,7 +34,7 @@ function buf2hex(buffer: Uint8Array) { // buffer is an 
ArrayBuffer
     .join('');
 }
 
-export function generateSegwitAddress(reservePub: string): SegwitAddrs {
+export function generateFakeSegwitAddress(reservePub: string, addr: string): 
SegwitAddrs {
   const pub = decodeCrock(reservePub)
 
   const first_rnd = getRandomBytes(4)
@@ -49,11 +49,16 @@ export function generateSegwitAddress(reservePub: string): 
SegwitAddrs {
   first_part.set(pub.subarray(0, 16), 4)
   const second_part = new Uint8Array(first_rnd.length + pub.length / 2)
   second_part.set(first_rnd, 0)
-  second_part.set(pub.subarray(16, 32), 4)
+  second_part.set(pub.subarray(16), 4)
+
+  console.log(first_part.length, second_part.length)
+
+  const prefix = (addr[0] === 't' && addr[1] == 'b') ? "tb" : (addr[0] === 'b' 
&& addr[1] == 'c' && addr[2] === 'r' && addr[3] == 't') ? 'bcrt' : (addr[0] === 
'b' && addr[1] == 'c') ? 'bc' : undefined
+  if (prefix === undefined) throw new Error('unknown bitcoin net')
 
   return {
-    segwitAddr1: segwitEncode("bc", first_part),
-    segwitAddr2: segwitEncode("bc", second_part),
+    segwitAddr1: segwit.default.encode(prefix, 0, first_part),
+    segwitAddr2: segwit.default.encode(prefix, 0, second_part),
   }
 }
 
diff --git a/packages/taler-util/src/segwit_addr.ts 
b/packages/taler-util/src/segwit_addr.ts
new file mode 100644
index 00000000..becc5d19
--- /dev/null
+++ b/packages/taler-util/src/segwit_addr.ts
@@ -0,0 +1,91 @@
+// Copyright (c) 2017, 2021 Pieter Wuille
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to 
deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+import bech32 from "./bech32.js"
+
+export default {
+  encode: encode,
+  decode: decode
+};
+
+function convertbits(data: any, frombits: number, tobits: number, pad: 
boolean): any[] {
+  var acc = 0;
+  var bits = 0;
+  var ret = [];
+  var maxv = (1 << tobits) - 1;
+  for (var p = 0; p < data.length; ++p) {
+    var value = data[p];
+    if (value < 0 || (value >> frombits) !== 0) {
+      return []; //check this, was returning null
+    }
+    acc = (acc << frombits) | value;
+    bits += frombits;
+    while (bits >= tobits) {
+      bits -= tobits;
+      ret.push((acc >> bits) & maxv);
+    }
+  }
+  if (pad) {
+    if (bits > 0) {
+      ret.push((acc << (tobits - bits)) & maxv);
+    }
+  } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
+    return []; //check this, was returning null
+  }
+  return ret;
+}
+
+function decode(hrp: any, addr: string) {
+  var bech32m = false;
+  var dec = bech32.decode(addr, bech32.encodings.BECH32);
+  if (dec === null) {
+    dec = bech32.decode(addr, bech32.encodings.BECH32M);
+    bech32m = true;
+  }
+  if (dec === null || dec.hrp !== hrp || dec.data.length < 1 || dec.data[0] > 
16) {
+    return null;
+  }
+  var res = convertbits(dec.data.slice(1), 5, 8, false);
+  if (res === null || res.length < 2 || res.length > 40) {
+    return null;
+  }
+  if (dec.data[0] === 0 && res.length !== 20 && res.length !== 32) {
+    return null;
+  }
+  if (dec.data[0] === 0 && bech32m) {
+    return null;
+  }
+  if (dec.data[0] !== 0 && !bech32m) {
+    return null;
+  }
+  return { version: dec.data[0], program: res };
+}
+
+function encode(hrp: any, version: number, program: any): string {
+  var enc = bech32.encodings.BECH32;
+  if (version > 0) {
+    enc = bech32.encodings.BECH32M;
+  }
+  var ret = bech32.encode(hrp, [version].concat(convertbits(program, 8, 5, 
true)), enc);
+  if (decode(hrp, ret/*, enc*/) === null) {
+    return ""; //check this was returning null
+  }
+  return ret;
+}
\ No newline at end of file

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