split trezor.crypto into more modules

Makefile

@@ -15,7 +15,7 @@ build_unix: ## build unix port
 	make -C vendor/micropython/unix
 
 run_unix: ## run unix port
-	./vendor/micropython/unix/micropython
+	cd src ; ../vendor/micropython/unix/micropython
 
 flash: ## flash firmware using st-flash
 	st-flash write $(STMHAL_BUILD_DIR)/firmware0.bin 0x8000000

emu.sh

@@ -2,3 +2,4 @@
 cd `dirname $0`/src
 rm -f ../pipe.*
 ../vendor/micropython/unix/micropython $* -O0 -X heapsize=100000 main.py
+rm -f ../pipe.*

src/trezor/crypto.py

@@ -1,4 +0,0 @@
-from TrezorCrypto import Base58, Sha256
-
-base58 = Base58()
-sha256 = Sha256()

src/trezor/crypto/base58.py

@@ -0,0 +1,21 @@
+from TrezorCrypto import Base58
+from . import sha256
+
+_base58 = Base58()
+
+def encode(data):
+    return _base58.encode(data)
+
+def decode(string):
+    return _base58.decode(string)
+
+def encode_check(data, hashlen=4):
+    h = sha256.hash(data)
+    return encode(data + h[:hashlen])
+
+def decode_check(string, hashlen=4):
+    data = decode(string)
+    d, h = data[:-hashlen], data[-hashlen:]
+    if sha256.hash(d) != h:
+        raise RuntimeError('Checksum error')
+    return d

src/trezor/crypto/sha256.py

@@ -0,0 +1,6 @@
+from TrezorCrypto import Sha256
+
+_sha256 = Sha256()
+
+def hash(data):
+    return _sha256.hash(data)