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diff --git a/ext/sha1/sha1.txt b/ext/sha1/sha1.txt
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-.\" sha1.doc -  -*- Indented-Text -*- created at: Thu May 17 06:51:50 JST 2001
-
-** SHA1(Class)
-
-A class to implement the SHA1 Secure Hash Algorithm by NIST (the US'
-National Institute of Standards and Technology), described in FIPS PUB
-180-1.
-
-Superclass: Object
-
-Class Methods:
-
-   new([str])
-   sha1([str])
-
-	Creates a new SHA1 object.  If a string argument is given, it
-        is added to the object. (see update.)
-
-Methods:
-
-   clone
-
-	Copies the SHA1 object.
-
-   digest
-
-	Returns the SHA1 hash of the added strings as a string of 20
-	bytes.
-
-   hexdigest
-
-	Returns the SHA1 hash of the added strings as a string of 40
-	hexadecimal digits.  This method is equal to:
-
-	def hexdigest
-	  ret = ''
-	  digest.each_byte {|i| ret << sprintf('%02x', i) }
-	  ret
-	end
-
-   update(str)
-   << str
-
-	Updates the SHA1 object with string str.  Repeated calls are
-	equivalent to a single call with the concatenation of all the
-	arguments, i.e. m.update(a); m.update(b) is equivalent to
-	m.update(a+b) and m << a << b is equivalent to m << a+b.
-
-Copyright:
-
-	sha1.c is in the public domain.
-
--------------------------------------------------------
-Local variables:
-fill-column: 70
-end: