{"version":3,"sources":["sha256.ts"],"sourcesContent":["/*\nCopyright 2022 Andrea Griffini\n\nPermission is hereby granted, free of charge, to any person obtaining\na copy of this software and associated documentation files (the\n\"Software\"), to deal in the Software without restriction, including\nwithout limitation the rights to use, copy, modify, merge, publish,\ndistribute, sublicense, and/or sell copies of the Software, and to\npermit persons to whom the Software is furnished to do so, subject to\nthe following conditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\nLIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\nOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\nWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n*/\n\n\n// get hex string id from buffer\nexport function buffer2hex(buffer:Uint8Array|ArrayBuffer, seperator?:string, pad_size_bytes?:number, x_shorthand = false):string {\n    if (buffer instanceof ArrayBuffer) buffer = new Uint8Array(buffer);\n\n    // first pad buffer\n    if (pad_size_bytes) buffer = buffer.slice(0, pad_size_bytes);\n\n    let array:string[] = <string[]> Array.prototype.map.call(buffer, x => ('00' + x.toString(16).toUpperCase()).slice(-2))\n    let skipped_bytes = 0;\n\n    // collapse multiple 0s to x...\n    if (x_shorthand) {\n        array = array.slice(0,pad_size_bytes).reduce((previous, current) => {\n            if (current == '00') {\n                if (previous.endsWith('00')) {\n                    skipped_bytes++;\n                    return previous.slice(0, -2) + \"x2\"; // add to existing 00\n                }\n                else if (previous[previous.length-2] == 'x') {\n                    const count = (parseInt(previous[previous.length-1],16)+1);\n                    if (count <= 0xf) {\n                        skipped_bytes++;\n                        return previous.slice(0, -1) + count.toString(16).toUpperCase()  // add to existing x... max 15\n                    }\n                }\n            }\n            return previous + current;\n        }).split(/(..)/g).filter(s=>!!s);\n    }\n\n    if (pad_size_bytes != undefined) array = Array.from({...array, length: pad_size_bytes-skipped_bytes}, x=>x==undefined?'00':x); // pad\n\n    return array.join(seperator??'');\n}\n\n\nexport function sha256(data: string): string {\n    const hashBuffer = _sha256(data);\n    // convert to hex string\n    return buffer2hex(hashBuffer).toLowerCase();\n}\n\n// sha256(data) returns the digest\n// sha256() returns an object you can call .add(data) zero or more time and .digest() at the end\n// digest is a 32-byte Uint8Array instance with an added .hex() function.\n// Input should be either a string (that will be encoded as UTF-8) or an array-like object with values 0..255.\nexport function _sha256(data: string): Uint8Array {\n    let h0 = 0x6a09e667, h1 = 0xbb67ae85, h2 = 0x3c6ef372, h3 = 0xa54ff53a,\n        h4 = 0x510e527f, h5 = 0x9b05688c, h6 = 0x1f83d9ab, h7 = 0x5be0cd19,\n        tsz = 0, bp = 0;\n    const k = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,\n               0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,\n               0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,\n               0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,\n               0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n               0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,\n               0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,\n               0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2],\n          rrot = (x, n) => (x >>> n) | (x << (32-n)),\n          w = new Uint32Array(64),\n          buf = new Uint8Array(64),\n          process = () => {\n              for (let j=0,r=0; j<16; j++,r+=4) {\n                  w[j] = (buf[r]<<24) | (buf[r+1]<<16) | (buf[r+2]<<8) | buf[r+3];\n              }\n              for (let j=16; j<64; j++) {\n                  let s0 = rrot(w[j-15], 7) ^ rrot(w[j-15], 18) ^ (w[j-15] >>> 3);\n                  let s1 = rrot(w[j-2], 17) ^ rrot(w[j-2], 19) ^ (w[j-2] >>> 10);\n                  w[j] = (w[j-16] + s0 + w[j-7] + s1) | 0;\n              }\n              let a = h0, b = h1, c = h2, d = h3, e = h4, f = h5, g = h6, h = h7;\n              for (let j=0; j<64; j++) {\n                  let S1 = rrot(e, 6) ^ rrot(e, 11) ^ rrot(e, 25),\n                      ch = (e & f) ^ ((~e) & g),\n                      t1 = (h + S1 + ch + k[j] + w[j]) | 0,\n                      S0 = rrot(a, 2) ^ rrot(a, 13) ^ rrot(a, 22),\n                      maj = (a & b) ^ (a & c) ^ (b & c),\n                      t2 = (S0 + maj) | 0;\n                  h = g; g = f; f = e; e = (d + t1)|0; d = c; c = b; b = a; a = (t1 + t2)|0;\n              }\n              h0 = (h0 + a)|0; h1 = (h1 + b)|0; h2 = (h2 + c)|0; h3 = (h3 + d)|0;\n              h4 = (h4 + e)|0; h5 = (h5 + f)|0; h6 = (h6 + g)|0; h7 = (h7 + h)|0;\n              bp = 0;\n          },\n          add = data => {\n              if (typeof data === \"string\") {\n                  data = typeof TextEncoder === \"undefined\" ? Buffer.from(data) : (new TextEncoder).encode(data);\n              }\n              for (let i=0; i<data.length; i++) {\n                  buf[bp++] = data[i];\n                  if (bp === 64) process();\n              }\n              tsz += data.length;\n          },\n          digest = () => {\n              buf[bp++] = 0x80; if (bp == 64) process();\n              if (bp + 8 > 64) {\n                  while (bp < 64) buf[bp++] = 0x00;\n                  process();\n              }\n              while (bp < 58) buf[bp++] = 0x00;\n              // Max number of bytes is 35,184,372,088,831\n              let L = tsz * 8;\n              buf[bp++] = (L / 1099511627776.) & 255;\n              buf[bp++] = (L / 4294967296.) & 255;\n              buf[bp++] = L >>> 24;\n              buf[bp++] = (L >>> 16) & 255;\n              buf[bp++] = (L >>> 8) & 255;\n              buf[bp++] = L & 255;\n              process();\n              let reply = new Uint8Array(32);\n              reply[ 0] = h0 >>> 24; reply[ 1] = (h0 >>> 16) & 255; reply[ 2] = (h0 >>> 8) & 255; reply[ 3] = h0 & 255;\n              reply[ 4] = h1 >>> 24; reply[ 5] = (h1 >>> 16) & 255; reply[ 6] = (h1 >>> 8) & 255; reply[ 7] = h1 & 255;\n              reply[ 8] = h2 >>> 24; reply[ 9] = (h2 >>> 16) & 255; reply[10] = (h2 >>> 8) & 255; reply[11] = h2 & 255;\n              reply[12] = h3 >>> 24; reply[13] = (h3 >>> 16) & 255; reply[14] = (h3 >>> 8) & 255; reply[15] = h3 & 255;\n              reply[16] = h4 >>> 24; reply[17] = (h4 >>> 16) & 255; reply[18] = (h4 >>> 8) & 255; reply[19] = h4 & 255;\n              reply[20] = h5 >>> 24; reply[21] = (h5 >>> 16) & 255; reply[22] = (h5 >>> 8) & 255; reply[23] = h5 & 255;\n              reply[24] = h6 >>> 24; reply[25] = (h6 >>> 16) & 255; reply[26] = (h6 >>> 8) & 255; reply[27] = h6 & 255;\n              reply[28] = h7 >>> 24; reply[29] = (h7 >>> 16) & 255; reply[30] = (h7 >>> 8) & 255; reply[31] = h7 & 255;\n              reply.hex = () => {\n                  let res = \"\";\n                  reply.forEach(x => res += (\"0\" + x.toString(16)).slice(-2));\n                  return res;\n              };\n              return reply;\n          };\n    if (data === undefined) return {add, digest};\n    add(data);\n    return digest();\n}\n\n// HMAC-SHA256 implementation\nfunction hmac_sha256(key, message) {\n    if (typeof key === \"string\") {\n        key = typeof TextEncoder === \"undefined\" ? Buffer.from(key) : (new TextEncoder).encode(key);\n    }\n    if (key.length > 64) key = sha256(key);\n    let inner = new Uint8Array(64).fill(0x36);\n    let outer = new Uint8Array(64).fill(0x5c);\n    for (let i=0; i<key.length; i++) {\n        inner[i] ^= key[i];\n        outer[i] ^= key[i];\n    }\n    let pass1 = sha256(), pass2 = sha256();\n    pass1.add(inner);\n    pass1.add(message);\n    pass2.add(outer);\n    pass2.add(pass1.digest());\n    return 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