1 line
6.6 KiB
JSON
1 line
6.6 KiB
JSON
{"ast":null,"code":"var Buffer = require('safe-buffer').Buffer; // prototype class for hash functions\n\n\nfunction Hash(blockSize, finalSize) {\n this._block = Buffer.alloc(blockSize);\n this._finalSize = finalSize;\n this._blockSize = blockSize;\n this._len = 0;\n}\n\nHash.prototype.update = function (data, enc) {\n if (typeof data === 'string') {\n enc = enc || 'utf8';\n data = Buffer.from(data, enc);\n }\n\n var block = this._block;\n var blockSize = this._blockSize;\n var length = data.length;\n var accum = this._len;\n\n for (var offset = 0; offset < length;) {\n var assigned = accum % blockSize;\n var remainder = Math.min(length - offset, blockSize - assigned);\n\n for (var i = 0; i < remainder; i++) {\n block[assigned + i] = data[offset + i];\n }\n\n accum += remainder;\n offset += remainder;\n\n if (accum % blockSize === 0) {\n this._update(block);\n }\n }\n\n this._len += length;\n return this;\n};\n\nHash.prototype.digest = function (enc) {\n var rem = this._len % this._blockSize;\n this._block[rem] = 0x80; // zero (rem + 1) trailing bits, where (rem + 1) is the smallest\n // non-negative solution to the equation (length + 1 + (rem + 1)) === finalSize mod blockSize\n\n this._block.fill(0, rem + 1);\n\n if (rem >= this._finalSize) {\n this._update(this._block);\n\n this._block.fill(0);\n }\n\n var bits = this._len * 8; // uint32\n\n if (bits <= 0xffffffff) {\n this._block.writeUInt32BE(bits, this._blockSize - 4); // uint64\n\n } else {\n var lowBits = (bits & 0xffffffff) >>> 0;\n var highBits = (bits - lowBits) / 0x100000000;\n\n this._block.writeUInt32BE(highBits, this._blockSize - 8);\n\n this._block.writeUInt32BE(lowBits, this._blockSize - 4);\n }\n\n this._update(this._block);\n\n var hash = this._hash();\n\n return enc ? 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