diff --git a/.vscode/settings.json b/.vscode/settings.json
index eb1af71..38f16d6 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -9,42 +9,10 @@
         "redefined-local": "Warning"
     },
     "Lua.diagnostics.globals": [
-        "printError",
-        "sleep",
-        "read",
-        "write",
         "print",
-        "colours",
-        "colors",
-        "commands",
-        "disk",
-        "fs",
-        "gps",
-        "help",
-        "http",
-        "paintutils",
-        "parallel",
-        "peripheral",
-        "rednet",
-        "redstone",
-        "keys",
-        "settings",
-        "shell",
-        "multishell",
-        "term",
-        "textutils",
-        "turtle",
-        "pocket",
-        "vector",
-        "bit32",
-        "window",
-        "_CC_DEFAULT_SETTINGS",
-        "_HOST",
         "_VERSION",
         "_",
-        "_ENV",
-        "ccemux",
-        "wordlib"
+        "_ENV"
     ],
-    "Lua.runtime.version": "Lua 5.1"
+    "Lua.runtime.version": "Lua 5.2"
 }
diff --git a/README.md b/README.md
index c29fbc9..963ca46 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # CCryptoLib
-An integrated collection of cryptographic primitives written in Lua using the ComputerCraft system API.
+An integrated collection of cryptographic primitives written in Lua using the ComputerCraft system API. This is a fork for [Phoenix](https://phoenix.madefor.cc). Requires libsystem.
 
 ## Initializing the Random Number Generator
 All functions that take secret input may query the library's random generator,
@@ -11,17 +11,27 @@ If you trust the tmpim Krist node, you can fetch a socket token and use it for
 initialization:
 ```lua
 local random = require "ccryptolib.random"
+local network = require "system.network"
 
 -- Fetch a WebSocket token.
-local postHandle = assert(http.post("https://krist.dev/ws/start", ""))
-local data = textutils.unserializeJSON(postHandle.readAll())
-postHandle.close()
+local postHandle = assert(network.post("https://krist.dev/ws/start", ""))
+local data = textutils.unserializeJSON(postHandle:read("*a"))
+postHandle:close()
 
 -- Initialize the generator using the given URL.
 random.init(data.url)
 
 -- Be polite and actually open the socket too.
-http.websocket(data.url).close()
+network.connect(data.url):close()
+```
+
+On CraftOS-PC or CCEmuX, you can use the built-in `nano` clock for relatively
+decent entropy (this will not work in-game!):
+```lua
+local random = require "ccryptolib.random"
+
+-- Initialize the generator using nanoseconds.
+random.init(os.time("nano"))
 ```
 
 Otherwise, you will need to find another high-quality random entropy source to
diff --git a/ccryptolib/aead.lua b/ccryptolib/aead.lua
index 7fce3c1..3e04fe8 100644
--- a/ccryptolib/aead.lua
+++ b/ccryptolib/aead.lua
@@ -1,6 +1,6 @@
 --- The ChaCha20Poly1305AEAD authenticated encryption with associated data (AEAD) construction.
 
-local expect   = require "cc.expect".expect
+local expect   = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local packing  = require "ccryptolib.internal.packing"
 local chacha20 = require "ccryptolib.chacha20"
diff --git a/ccryptolib/blake3.lua b/ccryptolib/blake3.lua
index 54a3e84..59c7ac2 100644
--- a/ccryptolib/blake3.lua
+++ b/ccryptolib/blake3.lua
@@ -1,6 +1,6 @@
 --- The BLAKE3 cryptographic hash function.
 
-local expect = require "cc.expect".expect
+local expect = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local packing = require "ccryptolib.internal.packing"
 
diff --git a/ccryptolib/chacha20.lua b/ccryptolib/chacha20.lua
index fdc51d0..d0defb1 100644
--- a/ccryptolib/chacha20.lua
+++ b/ccryptolib/chacha20.lua
@@ -1,6 +1,6 @@
 --- The ChaCha20 stream cipher.
 
-local expect  = require "cc.expect".expect
+local expect  = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local packing = require "ccryptolib.internal.packing"
 
diff --git a/ccryptolib/ed25519.lua b/ccryptolib/ed25519.lua
index 3ca677c..171e50b 100644
--- a/ccryptolib/ed25519.lua
+++ b/ccryptolib/ed25519.lua
@@ -1,6 +1,6 @@
 --- The Ed25519 digital signature scheme.
 
-local expect = require "cc.expect".expect
+local expect = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local fq     = require "ccryptolib.internal.fq"
 local sha512 = require "ccryptolib.internal.sha512"
diff --git a/ccryptolib/internal/sha512.lua b/ccryptolib/internal/sha512.lua
index 9a4eb33..7f44ae4 100644
--- a/ccryptolib/internal/sha512.lua
+++ b/ccryptolib/internal/sha512.lua
@@ -1,6 +1,6 @@
 --- The SHA512 cryptographic hash function.
 
-local expect  = require "cc.expect".expect
+local expect  = require "system.expect".expect
 local packing = require "ccryptolib.internal.packing"
 
 local shl = bit32.lshift
diff --git a/ccryptolib/poly1305.lua b/ccryptolib/poly1305.lua
index 123aad4..d5372b4 100644
--- a/ccryptolib/poly1305.lua
+++ b/ccryptolib/poly1305.lua
@@ -1,6 +1,6 @@
 --- The Poly1305 one-time authenticator.
 
-local expect  = require "cc.expect".expect
+local expect  = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local packing = require "ccryptolib.internal.packing"
 
diff --git a/ccryptolib/random.lua b/ccryptolib/random.lua
index 797a152..3d1659d 100644
--- a/ccryptolib/random.lua
+++ b/ccryptolib/random.lua
@@ -1,4 +1,4 @@
-local expect   = require "cc.expect".expect
+local expect   = require "system.expect".expect
 local blake3   = require "ccryptolib.blake3"
 local chacha20 = require "ccryptolib.chacha20"
 local util     = require "ccryptolib.internal.util"
@@ -8,8 +8,8 @@ local lassert = util.lassert
 -- Extract local context.
 local ctx = {
     "ccryptolib 2023-04-11T19:43Z random.lua initialization context",
-    os.epoch("utc"),
-    os.epoch("ingame"),
+    os.time() * 1000,
+    os.time("ingame") * 1000,
     math.random(0, 2 ^ 24 - 1),
     math.random(0, 2 ^ 24 - 1),
     tostring({}),
diff --git a/ccryptolib/sha256.lua b/ccryptolib/sha256.lua
index eca0f97..7ab95e9 100644
--- a/ccryptolib/sha256.lua
+++ b/ccryptolib/sha256.lua
@@ -1,6 +1,6 @@
 --- The SHA256 cryptographic hash function.
 
-local expect  = require "cc.expect".expect
+local expect  = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local packing = require "ccryptolib.internal.packing"
 
diff --git a/ccryptolib/util.lua b/ccryptolib/util.lua
index 0f2df8e..407e059 100644
--- a/ccryptolib/util.lua
+++ b/ccryptolib/util.lua
@@ -1,6 +1,6 @@
 --- General utilities for handling byte strings.
 
-local expect = require "cc.expect".expect
+local expect = require "system.expect".expect
 local random = require "cryptolib.random"
 local poly1305 = require "ccryptolib.poly1305"
 
diff --git a/ccryptolib/x25519.lua b/ccryptolib/x25519.lua
index 46212f0..97c6351 100644
--- a/ccryptolib/x25519.lua
+++ b/ccryptolib/x25519.lua
@@ -1,6 +1,6 @@
 --- The X25519 key exchange scheme.
 
-local expect = require "cc.expect".expect
+local expect = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local util = require "ccryptolib.internal.util"
 local c25 = require "ccryptolib.internal.curve25519"
diff --git a/ccryptolib/x25519c.lua b/ccryptolib/x25519c.lua
index 214bdbc..f2009cd 100644
--- a/ccryptolib/x25519c.lua
+++ b/ccryptolib/x25519c.lua
@@ -1,4 +1,4 @@
-local expect = require "cc.expect".expect
+local expect = require "system.expect".expect
 local lassert = require "ccryptolib.internal.util".lassert
 local fq     = require "ccryptolib.internal.fq"
 local fp     = require "ccryptolib.internal.fp"
diff --git a/profile.lua b/profile.lua
index b893a25..c929336 100644
--- a/profile.lua
+++ b/profile.lua
@@ -1,23 +1,20 @@
 local PROFILE_TIME_MS = 2000
 
 local function profile(fmt, fun, coeff)
-    local tStart = os.epoch("utc")
+    local tStart = os.time()
     local sum = 0
     local count = 0
     repeat
-        local t0 = os.epoch("utc")
+        local t0 = os.time()
         fun()
-        local t1 = os.epoch("utc")
+        local t1 = os.time()
         sum = sum + t1 - t0
         count = count + 1
         if count ~= 1 then
-            local x, y = term.getCursorPos()
-            term.setCursorPos(1, y - 1)
-            term.clearLine()
+            io.write("\x1b[F\x1b[K")
         end
         print(fmt:format(coeff * count / sum))
     until t1 - tStart > PROFILE_TIME_MS
-    sleep()
 end
 
 local random = require "ccryptolib.random"
diff --git a/spec/sha256_spec.lua b/spec/sha256_spec.lua
index 1a70799..8683f03 100644
--- a/spec/sha256_spec.lua
+++ b/spec/sha256_spec.lua
@@ -20,7 +20,6 @@ describe("sha256.digest", function()
             local msg = util.hexcat { shortMsg[i].msg }
             local md = util.hexcat { shortMsg[i].md }
             expect(sha256.digest(msg)):eq(md)
-            sleep()
         end
     end)
 
@@ -29,7 +28,6 @@ describe("sha256.digest", function()
             local msg = util.hexcat { longMsg[i].msg }
             local md = util.hexcat { longMsg[i].md }
             expect(sha256.digest(msg)):eq(md)
-            sleep()
         end
     end)
 
@@ -44,7 +42,6 @@ describe("sha256.digest", function()
                 md0, md1, md2 = md1, md2, sha256.digest(md0 .. md1 .. md2)
             end
             seed = md2
-            sleep()
         end
 
         local out = util.hexcat {
diff --git a/spec/sha512_spec.lua b/spec/sha512_spec.lua
index acb37fe..adb56e6 100644
--- a/spec/sha512_spec.lua
+++ b/spec/sha512_spec.lua
@@ -20,7 +20,6 @@ describe("sha512.digest", function()
             local msg = util.hexcat { shortMsg[i].msg }
             local md = util.hexcat { shortMsg[i].md }
             expect(sha512.digest(msg)):eq(md)
-            sleep()
         end
     end)
 
@@ -29,7 +28,6 @@ describe("sha512.digest", function()
             local msg = util.hexcat { longMsg[i].msg }
             local md = util.hexcat { longMsg[i].md }
             expect(sha512.digest(msg)):eq(md)
-            sleep()
         end
     end)
 
@@ -45,7 +43,6 @@ describe("sha512.digest", function()
                 md0, md1, md2 = md1, md2, sha512.digest(md0 .. md1 .. md2)
             end
             seed = md2
-            sleep()
         end
 
         local out = util.hexcat {
diff --git a/spec/x25519_spec.lua b/spec/x25519_spec.lua
index c3909a1..0c48e06 100644
--- a/spec/x25519_spec.lua
+++ b/spec/x25519_spec.lua
@@ -55,7 +55,6 @@ describe("x25519.exchange", function()
 
         for _ = 1, 1000 do
             k, u = x25519.exchange(k, u), k
-            sleep()
         end
 
         local k1000 = util.hexcat {
diff --git a/spec/x25519c_spec.lua b/spec/x25519c_spec.lua
index 308e349..362c0f5 100644
--- a/spec/x25519c_spec.lua
+++ b/spec/x25519c_spec.lua
@@ -61,7 +61,6 @@ describe("x25519c._EXPERIMENTAL_exchangeX", function()
 
         for _ = 1, 1000 do
             k, u = exchange(k, u), k
-            sleep()
         end
 
         local k1000 = util.hexcat {