crypto-gate (Python)

Universal Cryptographic Toolkit — by Analytics With Harry · Squid Consultancy Group Limited

Why crypto-gate?

One package. Every crypto primitive you need. Minimal dependencies.

crypto-gate wraps Python's built-in hashlib, hmac, and secrets modules into a clean, consistent API.

• Password Hashing — scrypt (memory-hard) + PBKDF2-SHA512
• Symmetric Encryption — AES-256-GCM authenticated encryption (via cryptography)
• Hashing — SHA-256/384/512, SHA3-256/512, BLAKE2b/BLAKE2s, MD5
• HMAC — HMAC-SHA256/SHA512
• Key Derivation — scrypt, PBKDF2
• Secure Tokens — UUID v4, OTP, API keys, recovery keys
• Timing-safe comparison

Installation

pip install crypto-gate

Requires Python ≥ 3.7.

Quick Start

from crypto_gate import PasswordHasher, Hasher, TokenGenerator

# Hash a password
hash = PasswordHasher.hash("my-secret-password")
print(hash)  # $cgscrypt$v1$32768$8$1$<salt>$<hash>

# Verify
ok = PasswordHasher.verify("my-secret-password", hash)
print(ok)  # True

# SHA-256
print(Hasher.sha256("hello world"))

# UUID
print(TokenGenerator.uuid())

# OTP
print(TokenGenerator.otp(6))  # 847291

API Reference

PasswordHasher

# scrypt (memory-hard, NIST-recommended)
hash = PasswordHasher.hash("password", n=32768, r=8, p=1, keylen=64)
ok   = PasswordHasher.verify("password", hash)

# PBKDF2-SHA512
hash = PasswordHasher.hash_pbkdf2("password", iterations=310000, keylen=64, digest="sha512")
ok   = PasswordHasher.verify_pbkdf2("password", hash)

# Strength analysis
result = PasswordHasher.analyze_strength("P@ssw0rd!")
# {"score": 7, "strength": "Very Strong", "suggestions": []}

AESCipher

from crypto_gate import AESCipher

key = AESCipher.generate_key()
enc = AESCipher.encrypt("sensitive data", key)
dec = AESCipher.decrypt(enc, key)

# Key from passphrase
kd = AESCipher.derive_key("my-passphrase")
enc = AESCipher.encrypt("data", kd["key"])

Hasher

from crypto_gate import Hasher

Hasher.sha256("data")          # hex
Hasher.sha512("data")          # hex
Hasher.sha3_256("data")        # hex
Hasher.sha3_512("data")        # hex
Hasher.blake2b("data")         # hex (64-byte digest)
Hasher.blake2s("data")         # hex (32-byte digest)
Hasher.md5("data")             # hex (legacy only)

# HMAC
Hasher.hmac_sha256("msg", "key")
Hasher.hmac_sha512("msg", "key")
Hasher.hmac("msg", "key", algorithm="sha384")

# Encodings
Hasher.sha256("data", encoding="base64")
Hasher.sha256("data", encoding="bytes")    # returns bytes

# Timing-safe compare
Hasher.compare(hash_a, hash_b)

KeyDeriver

from crypto_gate import KeyDeriver

r = KeyDeriver.scrypt("password", salt=None, keylen=64, n=32768, r=8, p=1)
# r = {"key": "hex...", "salt": "hex..."}

r = KeyDeriver.pbkdf2("password", salt=None, keylen=64, iterations=310000, digest="sha512")

TokenGenerator

from crypto_gate import TokenGenerator

TokenGenerator.random(32, "hex")         # 64-char hex token
TokenGenerator.random(32, "base64url")   # URL-safe base64

TokenGenerator.uuid()                    # "550e8400-e29b-41d4-a716-..."
TokenGenerator.otp(6)                    # "847291"
TokenGenerator.api_key("live")           # "cg_live_3f7a8b9c..."
TokenGenerator.recovery_key(4)           # "A3F2-88BC-4E19-DD73"
TokenGenerator.bytes(16)                 # b'\x3a\x7f...' — raw bytes
TokenGenerator.random_int(1, 100)        # secure random int in [1, 100]

Encoder

from crypto_gate import Encoder

Encoder.to_base64("hello")          # 'aGVsbG8='
Encoder.from_base64('aGVsbG8=')     # 'hello'
Encoder.to_base64url("hello world")
Encoder.from_base64url(s)
Encoder.to_hex("hello")             # '68656c6c6f'
Encoder.from_hex('68656c6c6f')      # 'hello'
Encoder.bytes_to_hex(b"data")
Encoder.hex_to_bytes("646174")

timing_safe_equal

from crypto_gate import timing_safe_equal

timing_safe_equal(hash_a, hash_b)  # bool — constant-time comparison

Security Notes

• scrypt vs bcrypt: scrypt is memory-hard and more resistant to GPU/ASIC attacks. Recommended for new systems.
• AES-256-GCM: Authenticated encryption provides both confidentiality and integrity.
• Timing-safe comparison: Always use timing_safe_equal or Hasher.compare for secret comparison.

Node.js Package

A companion Node.js implementation is available on npm with the same API structure, using only the built-in crypto module.

npm install crypto-gate

License

MIT © Analytics With Harry - Squid Consultancy Group Limited