lilliput-ae-reference-implementation

commit 1870b1eadf3963f9ec5d52bed21f04e523933612
parent d7830279e9545b420e4cc0f4b810675df728e98f
Author: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date:   Wed, 13 Mar 2019 16:47:57 +0100

Changement de l'API de l'implémentation Python

Pour qu'on puisse plus facilement manipuler les entrées/sorties.

Pour le moment le round-trip chiffrement/déchiffrement marche.

    import lilliput

    message = 'Hello 🌐!'
    adata = 'Signed: Kévin'

    for mode in 1,2:
        for keylen in 128, 192, 256:
            ct, tag = lilliput.mainEnc(message, adata, mode, keylen)
            pt = lilliput.mainDec(ct, tag, adata, mode, keylen)
            assert message == pt

Diffstat:
M
python/lilliput.py
 | 
26
++++++++++++++------------

1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/python/lilliput.py b/python/lilliput.py
@@ -48,15 +48,17 @@ def ArrayToBlockbytesMatrix(array) :
 
     return matrix
 
+def BlockbytesMatrixToBytes(matrix):
+    return bytes(byte for block in matrix for byte in block)
+
 ############################################
 
-def mainEnc(mode = 1, length = 128) :
+def mainEnc(plaintext, adata, mode=1, length=128):
 
     (key_bits, tweak_bits, rounds) = GetParameters(mode, length)
 
-
-    A = [byte for byte in range(0, 16)]
-    M = [byte for byte in range(0, 17)]
+    A = adata.encode()
+    M = plaintext.encode()
     N = [0 for byte in range(0, N_BYTES)]
     key = [byte for byte in range(0, int(key_bits/8))]
 
@@ -66,7 +68,6 @@ def mainEnc(mode = 1, length = 128) :
     A = ArrayToBlockbytesMatrix(A)
     M = ArrayToBlockbytesMatrix(M)
 
-
     if(mode == 1) :
         (C, tag) = lilliput_ae_1.OCB3Enc(A, M, N, A_BITS, M_BITS, key, key_bits, tweak_bits, rounds)
     if(mode == 2) :
@@ -78,18 +79,18 @@ def mainEnc(mode = 1, length = 128) :
         print("%02x "%(byte), end="")
     print()
 
+    return BlockbytesMatrixToBytes(C), bytes(tag)
 
-def mainDec(mode = 1, length = 128) :
 
-    (key_bits, tweak_bits, rounds) = GetParameters(mode, length)
+def mainDec(ciphertext, tag, adata, mode=1, length=128):
 
+    (key_bits, tweak_bits, rounds) = GetParameters(mode, length)
 
-    A = [byte for byte in range(0, 16)]
-    C = [byte for byte in range(0, 16)]
+    A = adata.encode()
+    C = ciphertext
     N = [0 for byte in range(0, N_BYTES)]
     key = [byte for byte in range(0, int(key_bits/8))]
-    tag = []
-
+    tag = list(tag)
 
     M_BITS = 8 * len(C)
     A_BITS = 8 * len(A)
@@ -97,7 +98,6 @@ def mainDec(mode = 1, length = 128) :
     A = ArrayToBlockbytesMatrix(A)
     C = ArrayToBlockbytesMatrix(C)
 
-
     if(mode == 1) :
         M = lilliput_ae_1.OCB3Dec(A, C, N, tag, A_BITS, M_BITS, key, key_bits, tweak_bits, rounds)
     if(mode == 2) :
@@ -106,3 +106,5 @@ def mainDec(mode = 1, length = 128) :
         for byte in M[block] :
             print("%02x "%(byte), end="")
     print()
+
+    return BlockbytesMatrixToBytes(M).decode()