Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { ch } from './ch.ts';
import { int32 } from './int32.ts';
import { maj } from './maj.ts';
import { ShaBase } from './sha-base.ts';
/**
* Constants used in the SHA-224 and SHA-256 cryptographic hash functions.
*
* These 32-bit integer values are the first 32 bits of the fractional parts of the cube roots of the first 64 prime numbers.
* They are used as round constants in the main compression function of the SHA-2 family of algorithms.
* @see [FIPS PUB 180-4, Section 4.2.2](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf)
* @internal
*/
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,
];
/**
* Computes the SHA-224/SHA-256 σ₀ (sigma0) function for a 32-bit integer.
*
* This function performs a bitwise rotation and XOR combination as defined in the SHA-2 specification:
* σ₀(x) = ROTR²(x) ⊕ ROTR¹³(x) ⊕ ROTR²²(x)
* @param x - The 32-bit integer input.
* @returns The result of applying the σ₀ function to the input.
* @internal
*/
function sigma0(x: number): number {
return ((x >>> 2) | (x << 30)) ^ ((x >>> 13) | (x << 19)) ^ ((x >>> 22) | (x << 10));
}
/**
* Computes the SHA-224/SHA-256 σ₁ (sigma1) function for a 32-bit integer.
*
* This function performs bitwise right rotations and XORs as defined in the SHA-2 specification:
* σ₁(x) = ROTR⁶(x) ⊕ ROTR¹¹(x) ⊕ ROTR²⁵(x)
* @param x - The 32-bit integer input.
* @returns The result of applying the σ₁ function to the input.
* @internal
*/
function sigma1(x: number): number {
return ((x >>> 6) | (x << 26)) ^ ((x >>> 11) | (x << 21)) ^ ((x >>> 25) | (x << 7));
}
/**
* Computes the SHA-224/SHA-256 σ₀ (gamma0) function for a 32-bit integer.
*
* This function performs a bitwise rotation and shift, then combines the results using XOR,
* as defined in the SHA-2 specification:
* σ₀(x) = ROTR⁷(x) ⊕ ROTR¹⁸(x) ⊕ SHR³(x)
* @param x - The 32-bit integer input.
* @returns The result of the σ₀ transformation.
* @internal
*/
function gamma0(x: number): number {
return ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3);
}
/**
* Computes the SHA-224/SHA-256 σ₁ (gamma1) function for a 32-bit integer.
*
* This function performs bitwise operations as defined in the SHA-2 specification:
* σ₁(x) = ROTR^17(x) XOR ROTR^19(x) XOR SHR^10(x)
* where:
* - ROTR^n(x) is the right rotation of x by n bits,
* - SHR^n(x) is the right shift of x by n bits.
* @param x - The 32-bit integer input.
* @returns The result of applying the σ₁ function to the input.
* @internal
*/
function gamma1(x: number): number {
return ((x >>> 17) | (x << 15)) ^ ((x >>> 19) | (x << 13)) ^ (x >>> 10);
}
/**
* Secure Hash Algorithm, SHA2 SHA-224
* @example
* ```typescript
* const sha224 = new Sha224();
* sha224.update('hello world', 'utf8');
* sha224.digest('hex');
* // '23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7'
* ```
* ```typescript
* const sha224 = new Sha224();
* sha224.update(new Uint8Array([0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64]));
* sha224.digest('hex');
* // '23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7'
* ```
* @group Binary
* @category Hash
*/
export class Sha224 extends ShaBase {
private a = 0xc1059ed8;
private b = 0x367cd507;
private c = 0x3070dd17;
private d = 0xf70e5939;
private e = 0xffc00b31;
private f = 0x68581511;
private g = 0x64f98fa7;
private h = 0xbefa4fa4;
private readonly w: number[];
/**
* Creates a new SHA-224 hash instance and initializes its internal state.
*
* @remarks
* The internal state variables are set to the initial SHA-224 constants as specified
* in FIPS PUB 180-4. Use {@link update} to process data and {@link digest} to retrieve the hash.
*/
public constructor() {
super(64, 56);
this.w = Array.from({ length: 64 });
}
protected override updateCounters(buffer: Uint8Array): void {
const { w } = this;
let a = int32(this.a);
let b = int32(this.b);
let c = int32(this.c);
let d = int32(this.d);
let e = int32(this.e);
let f = int32(this.f);
let g = int32(this.g);
let h = int32(this.h);
let i: number;
for (i = 0; i < 16; ++i) {
w[i] =
(buffer[i * 4 + 0] << 24) |
(buffer[i * 4 + 1] << 16) |
(buffer[i * 4 + 2] << 8) |
buffer[i * 4 + 3];
}
for (; i < 64; ++i) {
w[i] = int32(gamma1(w[i - 2]) + w[i - 7] + gamma0(w[i - 15]) + w[i - 16]);
}
for (let j = 0; j < 64; ++j) {
const T1 = int32(h + sigma1(e) + ch(e, f, g) + int32(K[j]) + w[j]);
const T2 = int32(sigma0(a) + maj(a, b, c));
h = g;
g = f;
f = e;
e = int32(d + T1);
d = c;
c = b;
b = a;
a = int32(T1 + T2);
}
this.a = int32(a + this.a);
this.b = int32(b + this.b);
this.c = int32(c + this.c);
this.d = int32(d + this.d);
this.e = int32(e + this.e);
this.f = int32(f + this.f);
this.g = int32(g + this.g);
this.h = int32(h + this.h);
}
protected override hash(): Uint8Array {
return new Uint8Array([
(this.a & 0xff000000) >> 24,
(this.a & 0x00ff0000) >> 16,
(this.a & 0x0000ff00) >> 8,
this.a & 0x000000ff,
(this.b & 0xff000000) >> 24,
(this.b & 0x00ff0000) >> 16,
(this.b & 0x0000ff00) >> 8,
this.b & 0x000000ff,
(this.c & 0xff000000) >> 24,
(this.c & 0x00ff0000) >> 16,
(this.c & 0x0000ff00) >> 8,
this.c & 0x000000ff,
(this.d & 0xff000000) >> 24,
(this.d & 0x00ff0000) >> 16,
(this.d & 0x0000ff00) >> 8,
this.d & 0x000000ff,
(this.e & 0xff000000) >> 24,
(this.e & 0x00ff0000) >> 16,
(this.e & 0x0000ff00) >> 8,
this.e & 0x000000ff,
(this.f & 0xff000000) >> 24,
(this.f & 0x00ff0000) >> 16,
(this.f & 0x0000ff00) >> 8,
this.f & 0x000000ff,
(this.g & 0xff000000) >> 24,
(this.g & 0x00ff0000) >> 16,
(this.g & 0x0000ff00) >> 8,
this.g & 0x000000ff,
]);
}
}
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