Post by Kelly Ethridge on Nov 2, 2006 8:37:13 GMT -5
In order to compute the hash for a string, the string must be converted to a byte array. There are a couple of ways this can be done.
One way is to use the StrConv method. However, since this method returns a String, it must be assigned to a byte array before passing the value into the hash algorithm.
Another method is to use the encoding classes, such as UTF8Encoding. Since the encoding classes return a byte array from a string, no intermediate variable is required.
These two methods may not compute the same hash value for the same string. This is because the conversion from string to byte array may produce a different set of byte values. It is important to use the same encoding when comparing hash values produced by strings.
One way is to use the StrConv method. However, since this method returns a String, it must be assigned to a byte array before passing the value into the hash algorithm.
Dim Data() As Byte
Data = StrConv("This is my text.", vbFromUnicode)
Dim Hasher As New SHA256Managed
Dim Hash() As Byte
Hash = Hasher.ComputeHash(Data)
Another method is to use the encoding classes, such as UTF8Encoding. Since the encoding classes return a byte array from a string, no intermediate variable is required.
Dim Hasher As New SHA256Managed
Dim Hash() As Byte
Hash = Hasher.ComputeHash(Encoding.UTF8.GetBytes("This is my text."))
These two methods may not compute the same hash value for the same string. This is because the conversion from string to byte array may produce a different set of byte values. It is important to use the same encoding when comparing hash values produced by strings.