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author | Sebastian <sebasjm@gmail.com> | 2022-03-03 17:49:28 -0300 |
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committer | Sebastian <sebasjm@gmail.com> | 2022-03-03 17:50:19 -0300 |
commit | 7d8acca7f948ded5f188e2fb9af6b0a11f9c0572 (patch) | |
tree | 968d03e399061542d358bd71c3790336490880bb /packages/taler-util/src/bech32.ts | |
parent | 39d9b1e6f8b63e10a0c8b6ad811d5d086b53abb7 (diff) | |
download | wallet-core-7d8acca7f948ded5f188e2fb9af6b0a11f9c0572.tar.xz |
changed implementation of bech32 to https://github.com/sipa/bech32/tree/master/ref/javascript
Diffstat (limited to 'packages/taler-util/src/bech32.ts')
-rw-r--r-- | packages/taler-util/src/bech32.ts | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/packages/taler-util/src/bech32.ts b/packages/taler-util/src/bech32.ts new file mode 100644 index 000000000..03c24e807 --- /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) }; +}
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