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Allow working with int32 encoded plaintext directly

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This commit is contained in:
Kovid Goyal 2016-03-22 14:01:23 +05:30
parent 05d5ad2f59
commit 84f304b7ca
1 changed files with 15 additions and 5 deletions
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20
src/pyj/aes.pyj
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@ -173,7 +173,7 @@ class AES:
U3[(tt >> 8) & 0xFF] ^ U3[(tt >> 8) & 0xFF] ^
U4[ tt & 0xFF]) U4[ tt & 0xFF])
def _crypt(self, plaintext, ciphertext, offset, encrypt): def _crypt(self, ciphertext, offset, encrypt):
if encrypt: if encrypt:
R1 = T1; R2 = T2; R3 = T3; R4 = T4 R1 = T1; R2 = T2; R3 = T3; R4 = T4
o1 = 1; o3 = 3 o1 = 1; o3 = 3
@ -188,8 +188,7 @@ class AES:
a = self.working_mem[0] a = self.working_mem[0]
t = self.working_mem[1] t = self.working_mem[1]
# convert plaintext to (ints ^ key) # XOR plaintext with key
convert_to_int32(plaintext, t, offset, 16)
for v'var i = 0; i < 4; i++': for v'var i = 0; i < 4; i++':
t[i] ^= K[0][i] t[i] ^= K[0][i]
@ -212,10 +211,21 @@ class AES:
ciphertext[offset + 4 * i + 3] = (SB[ t[(i + o3) % 4] & 0xff] ^ tt ) & 0xff ciphertext[offset + 4 * i + 3] = (SB[ t[(i + o3) % 4] & 0xff] ^ tt ) & 0xff
def encrypt(self, plaintext, ciphertext, offset): def encrypt(self, plaintext, ciphertext, offset):
return self._crypt(plaintext, ciphertext, offset, True) convert_to_int32(plaintext, self.working_mem[1], offset, 16)
return self._crypt(ciphertext, offset, True)
def encrypt32(self, plaintext, ciphertext, offset):
self.working_mem[1].set(plaintext)
return self._crypt(ciphertext, offset, True)
def decrypt(self, ciphertext, plaintext, offset): def decrypt(self, ciphertext, plaintext, offset):
return self._crypt(ciphertext, plaintext, offset, False) convert_to_int32(ciphertext, self.working_mem[1], offset, 16)
return self._crypt(plaintext, offset, False)
def decrypt32(self, ciphertext, plaintext, offset):
self.working_mem[1].set(ciphertext)
return self._crypt(plaintext, offset, False)
# }}}
def random_bytes_insecure(sz): def random_bytes_insecure(sz):
ans = Uint8Array(sz) ans = Uint8Array(sz)