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Fix Adler-32 for non-ASCII text #15664

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Lexus-099 wants to merge 2 commits into from
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Fix Adler-32 for non-ASCII text #15664

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65c00b2
Fix Adler-32 checksum for Unicode text
Lexus-099 Oct 28, 2026
561295b
Align Adler-32 with byte-based checksum definition
Lexus-099 Oct 28, 2026
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6 changes: 3 additions & 3 deletions hashes/adler32.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@
def adler32(plain_text: str) -> int:
"""
Function implements adler-32 hash.
Iterates and evaluates a new value for each character
Iterates over the UTF-8 bytes of the input text.

>>> adler32('Algorithms')
363791387
Expand All @@ -24,7 +24,7 @@ def adler32(plain_text: str) -> int:
"""
a = 1
b = 0
for plain_chr in plain_text:
a = (a + ord(plain_chr)) % MOD_ADLER
for plain_byte in plain_text.encode("utf-8"):
a = (a + plain_byte) % MOD_ADLER
b = (b + a) % MOD_ADLER
return (b << 16) | a