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tiny-sha1

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Tiny SHA-1 hasher for Node and browsers

github.com/maxdavidson/tiny-sha1

maxdavidson/tiny-sha1

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1
{"version":3,"file":null,"sources":["../src/utils.js","../src/index.js"],"sourcesContent":["export const systemLittleEndian =\n new Uint16Array(new Uint8Array([0x7F, 0xFF]).buffer)[0] === 0xFF7F;\n\nexport function swap4(num) {\n return ((num >> 24) & 0xff)\n | ((num >> 8) & 0xff00)\n | ((num << 8) & 0xff0000)\n | ((num << 24) & 0xff000000);\n}\n\nexport function align(address, alignment) {\n const tmp = alignment - 1;\n return (address + tmp) & ~tmp;\n}\n\n/** Convert a uint32 to an 8-character big-endian hex string. */\nexport function hexify(n) {\n let s = '';\n let i = 8;\n while (i--) {\n s += ((n >>> (i << 2)) & 0xf).toString(16);\n }\n return s;\n}\n\nexport function choice(x, y, z) {\n return (x & y) ^ (~x & z);\n}\n\nexport function parity(x, y, z) {\n return x ^ y ^ z;\n}\n\nexport function majority(x, y, z) {\n return (x & y) ^ (x & z) ^ (y & z);\n}\n\nexport function rotateLeft(value, bits) {\n return (value << bits) | (value >>> (32 - bits));\n}\n","import {\n systemLittleEndian, swap4, align, hexify,\n choice, majority, parity, rotateLeft,\n} from './utils';\n\nconst w = new Uint32Array(80);\n\nexport default function sha1(bytes) {\n if (!(bytes instanceof Uint8Array)) {\n throw new TypeError('Input data must be a Uint8Array.');\n }\n\n // Allocate a buffer to fit the message data,\n // the padding byte and the 64-bit message bit length\n const buffer = new ArrayBuffer(align(bytes.byteLength + 9, 64));\n const data = new Uint32Array(buffer);\n\n // Copy the message data and set the padding byte\n const dataU8 = new Uint8Array(buffer);\n dataU8.set(bytes);\n dataU8[bytes.byteLength] = 0x80;\n\n // Swap bytes if neeeded\n if (systemLittleEndian) {\n for (let i = 0, len = data.length; i < len; ++i) {\n data[i] = swap4(data[i]);\n }\n }\n\n const bitLength = 8 * bytes.byteLength;\n\n // Store the message bit length as a 64-bit value\n data[data.length - 2] = bitLength / Math.pow(2, 32);\n data[data.length - 1] = bitLength;\n\n // Set the initial hash state\n let h0 = 0x67452301;\n let h1 = 0xefcdab89;\n let h2 = 0x98badcfe;\n let h3 = 0x10325476;\n let h4 = 0xc3d2e1f0;\n\n /* eslint-disable one-var, one-var-declaration-per-line */\n let i, a, b, c, d, e, tmp;\n\n for (let offset = 0, len = data.length; offset < len; offset += 16) {\n for (i = 0; i < 16; ++i) {\n w[i] = data[offset + i];\n }\n\n for (i = 16; i < 80; ++i) {\n w[i] = rotateLeft(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);\n }\n\n a = h0;\n b = h1;\n c = h2;\n d = h3;\n e = h4;\n\n for (i = 0; i < 20; ++i) {\n tmp = (rotateLeft(a, 5) + choice(b, c, d) + e + 0x5a827999 + w[i]) | 0;\n e = d;\n d = c;\n c = rotateLeft(b, 30);\n b = a;\n a = tmp;\n }\n\n for (i = 20; i < 40; ++i) {\n tmp = (rotateLeft(a, 5) + parity(b, c, d) + e + 0x6ed9eba1 + w[i]) | 0;\n e = d;\n d = c;\n c = rotateLeft(b, 30);\n b = a;\n a = tmp;\n }\n\n for (i = 40; i < 60; ++i) {\n tmp = (rotateLeft(a, 5) + majority(b, c, d) + e + 0x8f1bbcdc + w[i]) | 0;\n e = d;\n d = c;\n c = rotateLeft(b, 30);\n b = a;\n a = tmp;\n }\n\n for (i = 60; i < 80; ++i) {\n tmp = (rotateLeft(a, 5) + parity(b, c, d) + e + 0xca62c1d6 + w[i]) | 0;\n e = d;\n d = c;\n c = rotateLeft(b, 30);\n b = a;\n a = tmp;\n }\n\n h0 = (h0 + a) | 0;\n h1 = (h1 + b) | 0;\n h2 = (h2 + c) | 0;\n h3 = (h3 + d) | 0;\n h4 = (h4 + e) | 0;\n }\n\n return 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