9.8 KiB
9.8 KiB
| id | title | challengeType | forumTopicId | dashedName |
|---|---|---|---|---|
| 5eb3e4c3a894c333d2811a3f | SHA-256 | 5 | 385328 | sha-256 |
--description--
A família SHA-2 é uma alternativa mais forte a SHA-1. A principal diferença entre elas é o comprimento do hash. Significa que a SHA-1 fornece um código mais curto com menos possibilidades para combinações únicas. SHA-2 ou SHA-256 cria um hash mais longo e, portanto, mais complexo com mais possibilidades.
--instructions--
Pesquise os detalhes de implementação e escreva uma função que receba uma string como parâmetro e retorna um hash usando SHA-256
--hints--
SHA256 deve ser uma função.
assert(typeof SHA256 === 'function');
SHA256("Rosetta code") deve retornar uma string.
assert(typeof SHA256('Rosetta code') === 'string');
SHA256("Rosetta code") deve retornar "764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf".
assert.equal(
SHA256('Rosetta code'),
'764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf'
);
SHA256("SHA-256 Hash") deve retornar "bee8c0cabdcf8c7835f40217dd35a8b0dba9134520e633f1c57285f35ca7ee3e".
assert.equal(
SHA256('SHA-256 Hash'),
'bee8c0cabdcf8c7835f40217dd35a8b0dba9134520e633f1c57285f35ca7ee3e'
);
SHA256("implementation") deve retornar "da31012c40330e7e21538e7dd57503b16e8a0839159e96137090cccc9910b171".
assert.equal(
SHA256('implementation'),
'da31012c40330e7e21538e7dd57503b16e8a0839159e96137090cccc9910b171'
);
SHA256("algorithm") deve retornar "b1eb2ec8ac9f31ff7918231e67f96e6deda83a9ff33ed2c67443f1df81e5ed14".
assert.equal(
SHA256('algorithm'),
'b1eb2ec8ac9f31ff7918231e67f96e6deda83a9ff33ed2c67443f1df81e5ed14'
);
SHA256("language") deve retornar "a4ef304ba42a200bafd78b046e0869af9183f6eee5524aead5dcb3a5ab5f8f3f".
assert.equal(
SHA256('language'),
'a4ef304ba42a200bafd78b046e0869af9183f6eee5524aead5dcb3a5ab5f8f3f'
);
--seed--
--seed-contents--
function SHA256(input) {
}
--solutions--
function SHA256(input) {
var chrsz = 8;
var hexcase = 0;
function safe_add(x, y) {
var lsw = (x & 0xffff) + (y & 0xffff);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xffff);
}
function S(X, n) {
return (X >>> n) | (X << (32 - n));
}
function R(X, n) {
return X >>> n;
}
function Ch(x, y, z) {
return (x & y) ^ (~x & z);
}
function Maj(x, y, z) {
return (x & y) ^ (x & z) ^ (y & z);
}
function Sigma0256(x) {
return S(x, 2) ^ S(x, 13) ^ S(x, 22);
}
function Sigma1256(x) {
return S(x, 6) ^ S(x, 11) ^ S(x, 25);
}
function Gamma0256(x) {
return S(x, 7) ^ S(x, 18) ^ R(x, 3);
}
function Gamma1256(x) {
return S(x, 17) ^ S(x, 19) ^ R(x, 10);
}
function Sigma0512(x) {
return S(x, 28) ^ S(x, 34) ^ S(x, 39);
}
function Sigma1512(x) {
return S(x, 14) ^ S(x, 18) ^ S(x, 41);
}
function Gamma0512(x) {
return S(x, 1) ^ S(x, 8) ^ R(x, 7);
}
function Gamma1512(x) {
return S(x, 19) ^ S(x, 61) ^ R(x, 6);
}
function core_sha256(m, l) {
var K = new Array(
0x428a2f98,
0x71374491,
0xb5c0fbcf,
0xe9b5dba5,
0x3956c25b,
0x59f111f1,
0x923f82a4,
0xab1c5ed5,
0xd807aa98,
0x12835b01,
0x243185be,
0x550c7dc3,
0x72be5d74,
0x80deb1fe,
0x9bdc06a7,
0xc19bf174,
0xe49b69c1,
0xefbe4786,
0xfc19dc6,
0x240ca1cc,
0x2de92c6f,
0x4a7484aa,
0x5cb0a9dc,
0x76f988da,
0x983e5152,
0xa831c66d,
0xb00327c8,
0xbf597fc7,
0xc6e00bf3,
0xd5a79147,
0x6ca6351,
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
);
var HASH = new Array(
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
);
var W = new Array(64);
var a, b, c, d, e, f, g, h, i, j;
var T1, T2;
m[l >> 5] |= 0x80 << (24 - (l % 32));
m[(((l + 64) >> 9) << 4) + 15] = l;
for (var i = 0; i < m.length; i += 16) {
a = HASH[0];
b = HASH[1];
c = HASH[2];
d = HASH[3];
e = HASH[4];
f = HASH[5];
g = HASH[6];
h = HASH[7];
for (var j = 0; j < 64; j++) {
if (j < 16) W[j] = m[j + i];
else
W[j] = safe_add(
safe_add(
safe_add(Gamma1256(W[j - 2]), W[j - 7]),
Gamma0256(W[j - 15])
),
W[j - 16]
);
T1 = safe_add(
safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]),
W[j]
);
T2 = safe_add(Sigma0256(a), Maj(a, b, c));
h = g;
g = f;
f = e;
e = safe_add(d, T1);
d = c;
c = b;
b = a;
a = safe_add(T1, T2);
}
HASH[0] = safe_add(a, HASH[0]);
HASH[1] = safe_add(b, HASH[1]);
HASH[2] = safe_add(c, HASH[2]);
HASH[3] = safe_add(d, HASH[3]);
HASH[4] = safe_add(e, HASH[4]);
HASH[5] = safe_add(f, HASH[5]);
HASH[6] = safe_add(g, HASH[6]);
HASH[7] = safe_add(h, HASH[7]);
}
return HASH;
}
function core_sha512(m, l) {
var K = new Array(
0x428a2f98d728ae22,
0x7137449123ef65cd,
0xb5c0fbcfec4d3b2f,
0xe9b5dba58189dbbc,
0x3956c25bf348b538,
0x59f111f1b605d019,
0x923f82a4af194f9b,
0xab1c5ed5da6d8118,
0xd807aa98a3030242,
0x12835b0145706fbe,
0x243185be4ee4b28c,
0x550c7dc3d5ffb4e2,
0x72be5d74f27b896f,
0x80deb1fe3b1696b1,
0x9bdc06a725c71235,
0xc19bf174cf692694,
0xe49b69c19ef14ad2,
0xefbe4786384f25e3,
0x0fc19dc68b8cd5b5,
0x240ca1cc77ac9c65,
0x2de92c6f592b0275,
0x4a7484aa6ea6e483,
0x5cb0a9dcbd41fbd4,
0x76f988da831153b5,
0x983e5152ee66dfab,
0xa831c66d2db43210,
0xb00327c898fb213f,
0xbf597fc7beef0ee4,
0xc6e00bf33da88fc2,
0xd5a79147930aa725,
0x06ca6351e003826f,
0x142929670a0e6e70,
0x27b70a8546d22ffc,
0x2e1b21385c26c926,
0x4d2c6dfc5ac42aed,
0x53380d139d95b3df,
0x650a73548baf63de,
0x766a0abb3c77b2a8,
0x81c2c92e47edaee6,
0x92722c851482353b,
0xa2bfe8a14cf10364,
0xa81a664bbc423001,
0xc24b8b70d0f89791,
0xc76c51a30654be30,
0xd192e819d6ef5218,
0xd69906245565a910,
0xf40e35855771202a,
0x106aa07032bbd1b8,
0x19a4c116b8d2d0c8,
0x1e376c085141ab53,
0x2748774cdf8eeb99,
0x34b0bcb5e19b48a8,
0x391c0cb3c5c95a63,
0x4ed8aa4ae3418acb,
0x5b9cca4f7763e373,
0x682e6ff3d6b2b8a3,
0x748f82ee5defb2fc,
0x78a5636f43172f60,
0x84c87814a1f0ab72,
0x8cc702081a6439ec,
0x90befffa23631e28,
0xa4506cebde82bde9,
0xbef9a3f7b2c67915,
0xc67178f2e372532b,
0xca273eceea26619c,
0xd186b8c721c0c207,
0xeada7dd6cde0eb1e,
0xf57d4f7fee6ed178,
0x06f067aa72176fba,
0x0a637dc5a2c898a6,
0x113f9804bef90dae,
0x1b710b35131c471b,
0x28db77f523047d84,
0x32caab7b40c72493,
0x3c9ebe0a15c9bebc,
0x431d67c49c100d4c,
0x4cc5d4becb3e42b6,
0x597f299cfc657e2a,
0x5fcb6fab3ad6faec,
0x6c44198c4a475817
);
var HASH = new Array(
0x6a09e667f3bcc908,
0xbb67ae8584caa73b,
0x3c6ef372fe94f82b,
0xa54ff53a5f1d36f1,
0x510e527fade682d1,
0x9b05688c2b3e6c1f,
0x1f83d9abfb41bd6b,
0x5be0cd19137e2179
);
var W = new Array(80);
var a, b, c, d, e, f, g, h, i, j;
var T1, T2;
}
function str2binb(str) {
var bin = Array();
var mask = (1 << chrsz) - 1;
for (var i = 0; i < str.length * chrsz; i += chrsz)
bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - (i % 32));
return bin;
}
function binb2str(bin) {
var str = '';
var mask = (1 << chrsz) - 1;
for (var i = 0; i < bin.length * 32; i += chrsz)
str += String.fromCharCode((bin[i >> 5] >>> (24 - (i % 32))) & mask);
return str;
}
function binb2hex(binarray) {
var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef';
var str = '';
for (var i = 0; i < binarray.length * 4; i++) {
str +=
hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8 + 4)) & 0xf) +
hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8)) & 0xf);
}
return str;
}
function binb2b64(binarray) {
var tab =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var str = '';
for (var i = 0; i < binarray.length * 4; i += 3) {
var triplet =
(((binarray[i >> 2] >> (8 * (3 - (i % 4)))) & 0xff) << 16) |
(((binarray[(i + 1) >> 2] >> (8 * (3 - ((i + 1) % 4)))) & 0xff) << 8) |
((binarray[(i + 2) >> 2] >> (8 * (3 - ((i + 2) % 4)))) & 0xff);
for (var j = 0; j < 4; j++) {
if (i * 8 + j * 6 > binarray.length * 32) str += '';
else str += tab.charAt((triplet >> (6 * (3 - j))) & 0x3f);
}
}
return str;
}
function hex_sha2(s) {
return binb2hex(core_sha256(str2binb(s), s.length * chrsz));
}
function b64_sha2(s) {
return binb2b64(core_sha256(str2binb(s), s.length * chrsz));
}
function str_sha2(s) {
return binb2str(core_sha256(str2binb(s), s.length * chrsz));
}
return hex_sha2(input);
}