System & Security
Chmod permission math, encryption, HMAC and User-Agent parsing
Chmod CalculatorTick permission bits for octal and symbolic notation, or decode 755 / rwxr-xr-x back.Crypto ToolsBcrypt hashing, AES-GCM text encryption and RSA key pair generation, all in the browser.User-Agent ParserParse a UA string into browser, engine, OS, device type and CPU architecture.HMAC CalculatorCompute an HMAC with SHA-1, SHA-256, SHA-384 or SHA-512 and output hex or Base64.DES / 3DES CipherEncrypt or decrypt with DES and 3DES in ECB or CBC mode with PKCS#7 padding.SM4 CipherEncrypt or decrypt with the Chinese national standard SM4 in ECB or CBC mode.