@asoftwareworld/form-builder-pro
Version:
ASW Form Builder Pro helps you with rapid development and designed web forms which includes several controls. The key feature of Form Builder is to make your content attractive and effective. We can customize our control at run time and preview the same b
123 lines • 22.3 kB
JavaScript
export class SHA256 {
static hash(msg) {
msg = SHA256.utf8Encode(msg);
// constants [§4.2.2]
const K = [
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6,
0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb,
0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee,
0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
];
// initial hash value
const hex = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
// PREPROCESSING
msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string
// convert string msg into 512-bit blocks (array of 16 32-bit integers)
// length (in 32-bit integers) of msg + ‘1’ + appended length
const l = msg.length / 4 + 2;
// number of 16-integer (512-bit) blocks required to hold 'l' ints
const N = Math.ceil(l / 16);
// message M is N×16 array of 32-bit integers
const M = new Array(N);
for (let i = 0; i < N; i++) {
M[i] = new Array(16);
for (let j = 0; j < 16; j++) {
// encode 4 chars per integer (64 per block), big-endian encoding
M[i][j] = (msg.charCodeAt(i * 64 + j * 4 + 0) << 24) | (msg.charCodeAt(i * 64 + j * 4 + 1) << 16) | (msg.charCodeAt(i * 64 + j * 4 + 2) << 8) | (msg.charCodeAt(i * 64 + j * 4 + 3) << 0);
} // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
}
// add length (in bits) into final pair of 32-bit integers (big-endian)
// note: most significant word would be (len-1)*8 >>> 32, but since JS converts
// bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
const lenHi = ((msg.length - 1) * 8) / Math.pow(2, 32);
const lenLo = ((msg.length - 1) * 8) >>> 0;
M[N - 1][14] = Math.floor(lenHi);
M[N - 1][15] = lenLo;
// HASH COMPUTATION
for (let i = 0; i < N; i++) {
const W = new Array(64);
// 1 - prepare message schedule 'W'
for (let t = 0; t < 16; t++) {
W[t] = M[i][t];
}
for (let t = 16; t < 64; t++) {
W[t] = (SHA256.σ1(W[t - 2]) + W[t - 7] + SHA256.σ0(W[t - 15]) + W[t - 16]) >>> 0;
}
// 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
let a = hex[0];
let b = hex[1];
let c = hex[2];
let d = hex[3];
let e = hex[4];
let f = hex[5];
let g = hex[6];
let h = hex[7];
// 3 - main loop (note '>>> 0' for 'addition modulo 2^32')
for (let t = 0; t < 64; t++) {
const T1 = h + SHA256.Σ1(e) + SHA256.choice(e, f, g) + K[t] + W[t];
const T2 = SHA256.Σ0(a) + SHA256.majority(a, b, c);
h = g;
g = f;
f = e;
e = (d + T1) >>> 0;
d = c;
c = b;
b = a;
a = (T1 + T2) >>> 0;
}
// 4 - compute the new intermediate hash value (note '>>> 0' for 'addition modulo 2^32')
hex[0] = (hex[0] + a) >>> 0;
hex[1] = (hex[1] + b) >>> 0;
hex[2] = (hex[2] + c) >>> 0;
hex[3] = (hex[3] + d) >>> 0;
hex[4] = (hex[4] + e) >>> 0;
hex[5] = (hex[5] + f) >>> 0;
hex[6] = (hex[6] + g) >>> 0;
hex[7] = (hex[7] + h) >>> 0;
}
// convert H0..H7 to hex strings (with leading zeros)
for (let h = 0; h < hex.length; h++) {
hex[h] = ('00000000' + hex[h].toString(16)).slice(-8);
}
return hex.join('');
}
static utf8Encode(str) {
try {
return new TextEncoder().encode(str).reduce((prev, curr) => prev + String.fromCharCode(curr), '');
}
catch (e) {
// no TextEncoder available?
return unescape(encodeURIComponent(str));
}
}
/**
* Rotates right (circular right shift) value x by n positions.
* @private
*/
static ROTR(n, x) {
return (x >>> n) | (x << (32 - n));
}
/**
* Logical functions
* @private
*/
static Σ0(x) {
return SHA256.ROTR(2, x) ^ SHA256.ROTR(13, x) ^ SHA256.ROTR(22, x);
}
static Σ1(x) {
return SHA256.ROTR(6, x) ^ SHA256.ROTR(11, x) ^ SHA256.ROTR(25, x);
}
static σ0(x) {
return SHA256.ROTR(7, x) ^ SHA256.ROTR(18, x) ^ (x >>> 3);
}
static σ1(x) {
return SHA256.ROTR(17, x) ^ SHA256.ROTR(19, x) ^ (x >>> 10);
}
static choice(x, y, z) {
return (x & y) ^ (~x & z);
}
static majority(x, y, z) {
return (x & y) ^ (x & z) ^ (y & z);
}
}
//# 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class SHA256 {\n    static hash(msg: any): any {\n        msg = SHA256.utf8Encode(msg);\n        // constants [§4.2.2]\n        const K = [\n            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6,\n            0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb,\n            0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee,\n            0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n        ];\n\n        // initial hash value\n        const hex: any = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];\n\n        // PREPROCESSING\n        msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string\n\n        // convert string msg into 512-bit blocks (array of 16 32-bit integers)\n        // length (in 32-bit integers) of msg + ‘1’ + appended length\n        const l = msg.length / 4 + 2;\n\n        // number of 16-integer (512-bit) blocks required to hold 'l' ints\n        const N = Math.ceil(l / 16);\n\n        // message M is N×16 array of 32-bit integers\n        const M = new Array(N);\n\n        for (let i = 0; i < N; i++) {\n            M[i] = new Array(16);\n            for (let j = 0; j < 16; j++) {\n                // encode 4 chars per integer (64 per block), big-endian encoding\n                M[i][j] = (msg.charCodeAt(i * 64 + j * 4 + 0) << 24) | (msg.charCodeAt(i * 64 + j * 4 + 1) << 16) | (msg.charCodeAt(i * 64 + j * 4 + 2) << 8) | (msg.charCodeAt(i * 64 + j * 4 + 3) << 0);\n            } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0\n        }\n        // add length (in bits) into final pair of 32-bit integers (big-endian)\n        // note: most significant word would be (len-1)*8 >>> 32, but since JS converts\n        // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators\n        const lenHi = ((msg.length - 1) * 8) / Math.pow(2, 32);\n        const lenLo = ((msg.length - 1) * 8) >>> 0;\n        M[N - 1][14] = Math.floor(lenHi);\n        M[N - 1][15] = lenLo;\n\n        // HASH COMPUTATION\n        for (let i = 0; i < N; i++) {\n            const W = new Array(64);\n\n            // 1 - prepare message schedule 'W'\n            for (let t = 0; t < 16; t++) {\n                W[t] = M[i][t];\n            }\n            for (let t = 16; t < 64; t++) {\n                W[t] = (SHA256.σ1(W[t - 2]) + W[t - 7] + SHA256.σ0(W[t - 15]) + W[t - 16]) >>> 0;\n            }\n\n            // 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value\n            let a = hex[0];\n            let b = hex[1];\n            let c = hex[2];\n            let d = hex[3];\n            let e = hex[4];\n            let f = hex[5];\n            let g = hex[6];\n            let h = hex[7];\n\n            // 3 - main loop (note '>>> 0' for 'addition modulo 2^32')\n            for (let t = 0; t < 64; t++) {\n                const T1 = h + SHA256.Σ1(e) + SHA256.choice(e, f, g) + K[t] + W[t];\n                const T2 = SHA256.Σ0(a) + SHA256.majority(a, b, c);\n                h = g;\n                g = f;\n                f = e;\n                e = (d + T1) >>> 0;\n                d = c;\n                c = b;\n                b = a;\n                a = (T1 + T2) >>> 0;\n            }\n\n            // 4 - compute the new intermediate hash value (note '>>> 0' for 'addition modulo 2^32')\n            hex[0] = (hex[0] + a) >>> 0;\n            hex[1] = (hex[1] + b) >>> 0;\n            hex[2] = (hex[2] + c) >>> 0;\n            hex[3] = (hex[3] + d) >>> 0;\n            hex[4] = (hex[4] + e) >>> 0;\n            hex[5] = (hex[5] + f) >>> 0;\n            hex[6] = (hex[6] + g) >>> 0;\n            hex[7] = (hex[7] + h) >>> 0;\n        }\n\n        // convert H0..H7 to hex strings (with leading zeros)\n        for (let h = 0; h < hex.length; h++) {\n            hex[h] = ('00000000' + hex[h].toString(16)).slice(-8);\n        }\n        return hex.join('');\n    }\n\n    private static utf8Encode(str: string): string {\n        try {\n            return new TextEncoder().encode(str).reduce((prev, curr) => prev + String.fromCharCode(curr), '');\n        } catch (e) {\n            // no TextEncoder available?\n            return unescape(encodeURIComponent(str));\n        }\n    }\n\n    /**\n     * Rotates right (circular right shift) value x by n positions.\n     * @private\n     */\n    private static ROTR(n: number, x: any): number {\n        return (x >>> n) | (x << (32 - n));\n    }\n\n    /**\n     * Logical functions\n     * @private\n     */\n    private static Σ0(x: any): number {\n        return SHA256.ROTR(2, x) ^ SHA256.ROTR(13, x) ^ SHA256.ROTR(22, x);\n    }\n    private static Σ1(x: any): number {\n        return SHA256.ROTR(6, x) ^ SHA256.ROTR(11, x) ^ SHA256.ROTR(25, x);\n    }\n    private static σ0(x: any): number {\n        return SHA256.ROTR(7, x) ^ SHA256.ROTR(18, x) ^ (x >>> 3);\n    }\n    private static σ1(x: any): number {\n        return SHA256.ROTR(17, x) ^ SHA256.ROTR(19, x) ^ (x >>> 10);\n    }\n    private static choice(x: any, y: any, z: any): number {\n        return (x & y) ^ (~x & z);\n    }\n    private static majority(x: any, y: any, z: any): number {\n        return (x & y) ^ (x & z) ^ (y & z);\n    }\n}\n"]}