Hawkynt

TEA-PRNG

Pseudorandom number generator based on the Tiny Encryption Algorithm (TEA) operating in counter mode. Encrypts sequential 64-bit counter values to produce random output. Simple and fast but TEA’s cryptographic weaknesses limit security.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Pseudorandom Number Generator
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	David Wheeler, Roger Needham
Year	1994
Origin	🇬🇧 United Kingdom
Source	algorithms/random/tea-prng.js

Parameters

Parameter	Supported values
Seed sizes	16 bytes (128 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• TEA: A Tiny Encryption Algorithm
• Cambridge Computer Laboratory TEA
• Original TEA Paper
• Counter Mode Operation

References

• Crypto++ TEA Implementation
• Bouncy Castle TEA Implementation

Test vectors

5 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — TEA-PRNG with all-zero seed, counter=0 - First block

Field	Value
seed	00000000000000000000000000000000
outputSize	8
input	null
expected	41ea3a0a94baa940

Vector 2 — TEA-PRNG with all-zero seed - First 16 bytes (2 blocks)

Field	Value
seed	00000000000000000000000000000000
outputSize	16
input	null
expected	41ea3a0a94baa940414091a7a27f9c32

Vector 3 — TEA-PRNG with all-ones seed - First block

Field	Value
seed	ffffffffffffffffffffffffffffffff
outputSize	8
input	null
expected	b94a017dde3f22cb

Vector 4 — TEA-PRNG with sequential seed - First 24 bytes (3 blocks)

Field	Value
seed	0123456789abcdeffedcba9876543210
outputSize	24
input	null
expected	f257f7402d578cee9000e53c6e76457247665aec5ccf9639

Vector 5 — TEA-PRNG with ASCII seed - First block

Field	Value
seed	59454c4c4f57205355424d4152494e45
outputSize	8
input	null
expected	aa3dc1152c9e1c64

---

← All algorithms

This site is open source. Improve this page.