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9.8 KiB
9.8 KiB
id, title, challengeType, forumTopicId, dashedName
| id | title | challengeType | forumTopicId | dashedName |
|---|---|---|---|---|
| 5eb3e4c3a894c333d2811a3f | SHA-256 | 1 | 385328 | sha-256 |
--description--
The SHA-2 family is a stronger alternative to SHA-1. The main difference between them is the length of the hash. Meaning SHA-1 provides a shorter code with fewer possibilities for unique combinations. SHA-2 or SHA-256 creates a longer and thus more complex hash with more possibilities.
--instructions--
调研实现细节并编写一个函数，该函数以字符串作为参数，并使用 SHA-256 返回哈希值。
--hints--
SHA256 应该是一个函数。
assert(typeof SHA256 === 'function');
SHA256("Rosetta code") 应该返回一个字符串。
assert(typeof SHA256('Rosetta code') === 'string');
SHA256("Rosetta code") 应该返回 "764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf"。
assert.equal(
SHA256('Rosetta code'),
'764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf'
);
SHA256("SHA-256 Hash") 应该返回 "bee8c0cabdcf8c7835f40217dd35a8b0dba9134520e633f1c57285f35ca7ee3e"。
assert.equal(
SHA256('SHA-256 Hash'),
'bee8c0cabdcf8c7835f40217dd35a8b0dba9134520e633f1c57285f35ca7ee3e'
);
SHA256("implementation") 应该返回 "da31012c40330e7e21538e7dd57503b16e8a0839159e96137090cccc9910b171"。
assert.equal(
SHA256('implementation'),
'da31012c40330e7e21538e7dd57503b16e8a0839159e96137090cccc9910b171'
);
SHA256("algorithm") 应该返回 "b1eb2ec8ac9f31ff7918231e67f96e6deda83a9ff33ed2c67443f1df81e5ed14"。
assert.equal(
SHA256('algorithm'),
'b1eb2ec8ac9f31ff7918231e67f96e6deda83a9ff33ed2c67443f1df81e5ed14'
);
SHA256("language") 应该返回 "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);
}