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ℹ️ fixed vigenere to handle non-ASCII letters #37

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Merged
securisec merged 1 commit into from
Jun 24, 2025
Merged

ℹ️ fixed vigenere to handle non-ASCII letters #37

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4 changes: 2 additions & 2 deletions chepy/modules/encryptionencoding.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1120,7 +1120,7 @@ def vigenere_encode(self, key: str) -> EncryptionEncodingT:
raise ValueError("The key must consist only of letters") # pragma: no cover

for i in range(len(input_str)):
if input_str[i].isalpha():
if input_str[i].isalpha() and input_str[i].lower() in alphabet:
is_upper = input_str[i].isupper()
input_char = input_str[i].lower()
key_char = key[(i - fail) % len(key)]
Expand Down Expand Up @@ -1162,7 +1162,7 @@ def vigenere_decode(self, key: str) -> EncryptionEncodingT:
raise ValueError("The key must consist only of letters") # pragma: no cover

for i in range(len(input_str)):
if input_str[i].isalpha():
if input_str[i].isalpha() and input_str[i].lower() in alphabet:
is_upper = input_str[i].isupper()
input_char = input_str[i].lower()
key_char = key[(i - fail) % len(key)]
Expand Down
4 changes: 3 additions & 1 deletion tests/test_encryptionencoding.py
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Original file line number Diff line number Diff line change
Expand Up @@ -669,12 +669,13 @@ def test_blowfish_decrypt():
)


def test_vigener_encode():
def test_vigenere_encode():
assert (
Chepy("shaktictf{y4Yyy!_M1S5i0n_4cCoMpL1sH3D}").vigenere_encode("victory").o
== b"npcdhzaon{a4Rmp!_K1N5q0p_4vQfKkT1uA3R}"
)
assert Chepy("secret").vigenere_encode("secret").o == b"kieiim"
assert Chepy("Vigenère").vigenere_encode("key").o.decode() == "Fmeorèpo"


def test_vigenere_decode():
Expand All @@ -683,6 +684,7 @@ def test_vigenere_decode():
== b"shaktictf{y4Yyy!_M1S5i0n_4cCoMpL1sH3D}"
)
assert Chepy("kieiim").vigenere_decode("secret").o == b"secret"
assert Chepy("Fmeorèpo").vigenere_decode("key").o.decode() == "Vigenère"


def test_affine_encode():
Expand Down