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Chris Tate
283a504fe0
crypto.createDiffieHellman, crypto.getDiffieHellman and crypto.createDiffieHellmanGroup return native DiffieHellman and DiffieHellmanGroup handles backed by mbedTLS bignums. generateKeys, computeSecret, getPrime, getGenerator, getPublicKey, getPrivateKey, setPublicKey, setPrivateKey and verifyError follow Node 24.22: - the modp1, modp2, modp5 and modp14 through modp18 groups, with the private key widths of Node's OpenSSL 3 path (200 to 400 bits for modp5 and up, [2, p - 2] for modp1 and modp2); - explicit primes and generators in every argument form and encoding, with keys of bits(p) - 2 bits, or below min(2^N, q) when the parameters equal an OpenSSL named group (RFC 3526, RFC 7919, RFC 5114); - generated safe primes with OpenSSL's congruences for the generator; - verifyError's DH_check bits, computed when it is first read; - Node's argument, generator, modulus, key range, state and encoding errors, including the OpenSSL errors' library and reason properties. Safe-prime generation sieves candidates with the odd primes below a bound that grows with the prime's length and tests them with Miller-Rabin rounds over a variable-time Montgomery exponentiation that only reads public values; key and secret exponentiations stay on mbedTLS's constant-time path. Primes longer than 8192 bits, property reads other than verifyError, property writes, Object.prototype methods, and calls whose output encoding is typed any or matches no @types/node overload are refused. The runtime unit scr_dh.c links, with the mbedTLS archive, only into programs that use DiffieHellman. wasm32-wasi builds refuse it. The ECDH unit's argument and encoding helpers move to scr_crypto_args.h, which both units include.