golang.org/x/crypto v0.58.0: argon2.IDKey

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/crypto/argon2.IDKey in pkg:golang/golang.org/x/crypto@v0.58.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/crypto@v0.58.0
Demonstrate these symbols/APIs:
  - golang.org/x/crypto/argon2.IDKey

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:87861558dd9678c643e67dc7a59fcb0134b5a410300b107e81ae7e3d4997afaf","contract":["argon2.IDKey derives a deterministic key slice of the requested keyLen bytes from password, salt, time, memory, and threads parameters","argon2.IDKey produces distinct keys when given different salts and respects custom key lengths such as 32 and 64 bytes"],"goal":"verify golang.org/x/crypto/argon2.IDKey in pkg:golang/golang.org/x/crypto@v0.58.0","kind":"HOW","packages":["pkg:golang/golang.org/x/crypto@v0.58.0"],"schemaVersion":1,"symbols":["golang.org/x/crypto/argon2.IDKey"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/crypto@v0.58.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/crypto@v0.58.0","symbols":["golang.org/x/crypto/argon2.IDKey"],"verifierAdapter":"golang@1"}

module sample

go 1.26.0

require golang.org/x/crypto v0.58.0

require golang.org/x/sys v0.49.0 // indirect

golang.org/x/crypto v0.58.0 h1:COkYLr4k7nDI4r6QtMML2AfzeIswWHAJthLS6K/M/54=
golang.org/x/crypto v0.58.0/go.mod h1:Xh+kl5A+M0gMiWDytH2Hhr5Z7WbNCpv/eB/EFgfSk+w=
golang.org/x/sys v0.49.0 h1:XbzkgYJHdqh/8m2Uu0W/dQv8nktxx4BFHp1M0gROTXA=
golang.org/x/sys v0.49.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/crypto/argon2.IDKey in pkg:golang/golang.org/x/crypto@v0.58.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/crypto@v0.58.0"
  ],
  "symbols": [
    "golang.org/x/crypto/argon2.IDKey"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

	"golang.org/x/crypto/argon2"
)

func main() {
	password := []byte("sample-password-input")
	salt := []byte("0123456789abcdef")

	key1 := argon2.IDKey(password, salt, 1, 64*1024, 4, 32)
	if len(key1) != 32 {
		fmt.Fprintf(os.Stderr, "expected 32-byte key, got %d\n", len(key1))
		os.Exit(1)
	}

	key2 := argon2.IDKey(password, salt, 1, 64*1024, 4, 32)
	if !bytes.Equal(key1, key2) {
		fmt.Fprintln(os.Stderr, "expected deterministic output for identical inputs")
		os.Exit(1)
	}

	otherSaltKey := argon2.IDKey(password, []byte("fedcba9876543210"), 1, 64*1024, 4, 32)
	if bytes.Equal(key1, otherSaltKey) {
		fmt.Fprintln(os.Stderr, "expected different key for different salt")
		os.Exit(1)
	}

	key64 := argon2.IDKey(password, salt, 1, 16*1024, 2, 64)
	if len(key64) != 64 {
		fmt.Fprintf(os.Stderr, "expected 64-byte key, got %d\n", len(key64))
		os.Exit(1)
	}
}