Cryptographic Hashing
Nyx ships SHA-256, MD5, and HMAC-SHA256 as built-in functions backed by the runtime's crypto.c module. No external library or import is required — all three are available in every Nyx program.
Code
// Criptografía: SHA-256, MD5 y HMAC-SHA256
fn main() -> int {
// SHA-256
let h1: String = sha256("hello world")
print("sha256(\"hello world\"):")
print(" " + h1)
print(" longitud: " + int_to_string(h1.length()) + " chars")
// SHA-256 de string vacío
let h_empty: String = sha256("")
print("sha256(\"\"):")
print(" " + h_empty)
// MD5
let m1: String = md5("hello world")
print("md5(\"hello world\"):")
print(" " + m1)
print(" longitud: " + int_to_string(m1.length()) + " chars")
// HMAC-SHA256
let key: String = "clave-secreta"
let data: String = "mensaje importante"
let hmac: String = hmac_sha256(key, data)
print("hmac_sha256(key, data):")
print(" " + hmac)
// Verificar determinismo: mismo input -> mismo hash
let a: String = sha256("nyx")
let b: String = sha256("nyx")
print("sha256 es determinista: " + int_to_string(a == b))
// Verificar que inputs distintos -> hashes distintos
let c: String = sha256("aaa")
let d: String = sha256("bbb")
print("hashes distintos para inputs distintos: " + int_to_string(c != d))
return 0
}Output
sha256("hello world"):
b94d27b9934d3e08a52e52d7da7dabfac484efe04294e576e5b9571d73f61a7d
longitud: 64 chars
sha256(""):
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
md5("hello world"):
5eb63bbbe01eeed093cb22bb8f5acdc3
longitud: 32 chars
hmac_sha256(key, data):
(valor dependiente de key y data)
sha256 es determinista: 1
hashes distintos para inputs distintos: 1
Explanation
sha256(s) returns a 64-character lowercase hexadecimal string — the standard encoding of a 256-bit (32-byte) digest. The empty-string hash e3b0c44... is a well-known constant you can use to verify your toolchain is computing correctly. SHA-256 is suitable for data integrity checks, password hashing (with a proper KDF on top), and digital signatures.
md5(s) returns a 32-character hex string (128-bit digest). MD5 is no longer considered cryptographically secure for collision resistance, but it remains widely used for checksums and cache keys where collision attacks are not a concern.
hmac_sha256(key, data) computes a keyed hash that proves both the content of data and knowledge of key. It is the standard primitive for API request signing and JWT verification. The determinism assertions at the end demonstrate a fundamental property of all hash functions: identical inputs always produce identical outputs.