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From: mahesh_m
Message 2 in Discussion
New Message on MumbaiUserGroup
[20Nov05] How Do I
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From:
mahesh_m
20 November 2005
How Do I...
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How Do I Generate and compare a hash value?
It is easy to generate and compare hash values using the cryptographic
resources contained in the System.Security.Cryptography namespace. Because all
hash functions take input of type Byte[], it might be necessary to convert the
source into a byte array before it is hashed.
To generate a hash value, create an instance of a hash algorithm and call
ComputeHash() on it. The following code creates an instance of the MD5 hash
algorithm and calls ComputeHash() on it. The hash function returns a byte array
containing the hash value of the byte array Input
VB.NET
Dim HashVal As Byte() = New MD5CryptoServiceProvider().ComputeHash(Input)
C#
Byte[] HashVal = (new MD5CryptoServiceProvider()).ComputeHash(Input);
Note that ComputeHash() is the final operation performed on an instance of a
hash object. If another hash value needs to be generated, a new instance of a
hash algorithm must be created.
System.Security.Cryptography contains implementations of MD5, SHA1, SHA256,
SHA384, and SHA512. The following code computes a SHA1 hash value
VB.NET
Dim HashVal As Byte() = New SHA1CryptoServiceProvider().ComputeHash(Input)
C#
Byte[] HashVal = (new SHA1CryptoServiceProvider()).ComputeHash(Input);
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Thank You,
Regards,
m_mahesh
Mahesh Mitkari
INETA Volunteer
Asst. Manager (Pune .net User group)
Manager (PUG Student)
09890555485 ([EMAIL PROTECTED])
http://mmahesh.blogspot.com
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