INNER CODE UNIT · TypeScript

rotl

paulmillr/noble-ciphers · src/_arx.ts:84

export function rotl(a: number, b: number): number {
  return (a << b) | (a >>> (32 - b));
}

/**
 * ARX core function operating on 32-bit words. Ciphers must use u32 for efficiency.
 * @param sigma - Sigma constants for the selected cipher layout.
 * @param key - Expanded key words.
 * @param nonce - Nonce and counter words prepared for the round function.
 * @param output - Output block written in place.
 * @param counter - Block counter value.
 * @param rounds - Optional round count override.
 */
export type CipherCoreFn = (
  sigma: TArg<Uint32Array>,
  key: TArg<Uint32Array>,
  nonce: TArg<Uint32Array>,
  output: TArg<Uint32Array>,

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