passshafe.py

def rot_r(a: int, n: int) -> int:
    return ((a >> n) | (a << (32 - n))) & 0xffffffff


def ch(x: int, y: int, z: int) -> int:
    return z ^ (x & (y ^ z))


def maj(x: int, y: int, z: int) -> int:
    return (x & y) ^ (x & z) ^ (y & z)


def sigma0(x: int) -> int:
    return rot_r(x, 2) ^ rot_r(x, 13) ^ rot_r(x, 22)


def sigma1(x: int) -> int:
    return rot_r(x, 6) ^ rot_r(x, 11) ^ rot_r(x, 25)


def gamma0(x: int) -> int:
    return rot_r(x, 7) ^ rot_r(x, 18) ^ (x >> 3)


def gamma1(x: int) -> int:
    return rot_r(x, 17) ^ rot_r(x, 19) ^ (x >> 10)


K = [
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
]


def sha256(data: bytes) -> bytes:
    state = [
        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
        0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
    ]
    message = data + b'\x80'
    message += b'\x00' * ((56 - len(message) % 64) % 64)
    message += (len(data) * 8).to_bytes(8, 'big')
    for i_ in range(len(message) // 64):
        block = message[i_ * 64:(i_ + 1) * 64]
        w = [int.from_bytes(block[i * 4:(i + 1) * 4], 'big') for i in range(16)]
        for i in range(48):
            w.append((gamma1(w[-2]) + w[-7] + gamma0(w[-15]) + w[-16]) & 0xffffffff)
        g = state.copy()
        for i in range(64):
            t1 = (g[7] + sigma1(g[4]) + ch(g[4], g[5], g[6]) + K[i] + w[i]) & 0xffffffff
            t2 = (sigma0(g[0]) + maj(g[0], g[1], g[2])) & 0xffffffff
            g = (t1 + t2) & 0xffffffff, g[0], g[1], g[2], (g[3] + t1) & 0xffffffff, g[4], g[5], g[6]
        state = [(x + y) & 0xffffffff for x, y in zip(state, g)]
    return b''.join([x.to_bytes(4, 'big') for x in state])


def hmac(key: bytes, msg: bytes, hasher: callable) -> bytes:
    if len(key) > 64:
        key = hasher(key)
    key += bytes(64 - len(key))
    opad = bytes(0x5c ^ i for i in range(256))
    ipad = bytes(0x36 ^ i for i in range(256))
    return hasher(key.translate(opad) + hasher(key.translate(ipad) + msg))


CHARSET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/!$%&()=?*'[]{}<>|-_.:,;#@"


def generate_password(master_password: str, account_identifier: str, length: int = 24) -> str:
    digest = hmac(master_password.encode() + bytes((length % 256,)), account_identifier.encode(), sha256)

    out = ""
    for i in range(length):
        out += CHARSET[int.from_bytes(digest, 'big') % len(CHARSET)]
        digest = hmac(master_password.encode() + bytes((i % 256,)), digest, sha256)
    return out


if __name__ == '__main__':
    print("Enter your Master Password:")
    master = input()
    print("Enter your Account Identifier:")
    account = input()
    print("Your Password:")
    print(generate_password(master, account, 24))