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Example code of paragonie/seedspring

Informations about the package seedspring

seedspring

Build Status

Seeded, Deterministic PRNG (based on AES-CTR instead of LCG) (Requires PHP 7 or random_compat)

Security Warning

This is not meant to replace random_bytes(). Think of this as an improvement to srand() + rand(). Do not use this for security purposes.

Installing

Usage

Motivation

A cryptographically secure pseudorandom number generator, such as random_int(), is wonderful for security purposes. However, there are situations where you need to generate a deterministic, pseudorandom byte stream on two devices from a shared seed. (e.g. something like Minecraft's world generator).

PHP's native seedable (and insecure) RNGs, rand() and mt_rand(), only support a 32-bit integer seed, which severely limits the possible outputs. Our deterministic RNG supports up to 2^128 possible outputs, since it's based on a 128-bit block cipher.

Our implementation uses AES-128-CTR to turn a finite, 128-bit key into an practically endless stream of random bytes.

It will repeat after 2^132 bytes of output. You should consider rekeying after 2^66 bytes.

For anything security-sensitive, you should rekey after 2^39 bytes. This is because the probability of predicting successive blocks becomes unacceptably high for security operations.

All versions of seedspring with dependencies

PHP Build Version
Package Version
Requires php Version >= 5.6
ext-openssl Version *
paragonie/constant_time_encoding Version ^1|^2|^3
paragonie/random_compat Version >=2
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