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Added notes to clarify that binascii.crc32(), zlib.crc32(), and

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zlib.adler32() are not suitable as general hash functions.
This commit is contained in:
Fred Drake 2001-10-15 13:45:49 +00:00
parent a5f73f9bab
commit 327798ca4a
2 changed files with 9 additions and 3 deletions
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4
Doc/lib/libbinascii.tex
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@ -92,7 +92,9 @@ Compute the binhex4 crc value of \var{data}, starting with an initial
\begin{funcdesc}{crc32}{data\optional{, crc}} \begin{funcdesc}{crc32}{data\optional{, crc}}
Compute CRC-32, the 32-bit checksum of data, starting with an initial Compute CRC-32, the 32-bit checksum of data, starting with an initial
crc. This is consistent with the ZIP file checksum. Use as follows: crc. This is consistent with the ZIP file checksum. Since the
algorithm is designed for use as a checksum algorithm, it is not
suitable for use as a general hash algorithm. Use as follows:
\begin{verbatim} \begin{verbatim}
print binascii.crc32("hello world") print binascii.crc32("hello world")
# Or, in two pieces: # Or, in two pieces:

8
Doc/lib/libzlib.tex
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@ -29,7 +29,9 @@ The available exception and functions in this module are:
used. This allows computing a running checksum over the used. This allows computing a running checksum over the
concatenation of several input strings. The algorithm is not concatenation of several input strings. The algorithm is not
cryptographically strong, and should not be used for cryptographically strong, and should not be used for
authentication or digital signatures. authentication or digital signatures. Since the algorithm is
designed for use as a checksum algorithm, it is not suitable for
use as a general hash algorithm.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{compress}{string\optional{, level}} \begin{funcdesc}{compress}{string\optional{, level}}
@ -58,7 +60,9 @@ The available exception and functions in this module are:
checksum; otherwise, a fixed default value is used. This allows checksum; otherwise, a fixed default value is used. This allows
computing a running checksum over the concatenation of several computing a running checksum over the concatenation of several
input strings. The algorithm is not cryptographically strong, and input strings. The algorithm is not cryptographically strong, and
should not be used for authentication or digital signatures. should not be used for authentication or digital signatures. Since
the algorithm is designed for use as a checksum algorithm, it is not
suitable for use as a general hash algorithm.
\end{funcdesc} \end{funcdesc}
\begin{funcdesc}{decompress}{string\optional{, wbits\optional{, bufsize}}} \begin{funcdesc}{decompress}{string\optional{, wbits\optional{, bufsize}}}