Property in Visual Basic .NET

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Property
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BlockSizeValue
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Type
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Description
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Specifies the size, in number of bits, of the block used by the algorithm. Returns true if you can reuse the current hash transform. Inherited from the System.Security.Cryptography.HashAlgorithm class. Returns true if the algorithm can transform multiple blocks. Inherited from the System.Security.Cryptography.HashAlgorithm class. Gets the computed hash value. Inherited from the System.Security.Cryptography.HashAlgorithm class. Gets/sets the name of the algorithm used for hashing.
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CanReuseTransform
EAN-13 Generation In None
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bool
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CanTransformMultipleBlocks bool
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Hash
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byte[]
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HashName
string
CHAPTER 15 SECURITY
HashSize
Specifies the size, in number of bits, of the computed hash value. Inherited from the System.Security.Cryptography.HashAlgorithm class. Specifies the size, in number of bits, of input blocks. Inherited from the System.Security.Cryptography.HashAlgorithm class. Gets/sets the secret key used in the algorithm, which overrides KeyedHashAlgorithm.Key property. Specifies the size of the output block. Inherited from the System.Security.Cryptography.HashAlgorithm class.
InputBlockSize
byte[]
OutputBlockSize
Table 15-3 describes the key methods. Table 15-3. Key Methods of System.Security.Cryptography.HMAC (et al.)
Method
Clear
Description
Releases all resources used by the algorithm. Inherited from the System.Security.Cryptography.HashAlgorithm class. Computes a hash for a byte array (or section thereof) or a Stream. This is the method you use to generate hashes. Inherited from the System.Security.Cryptography.HashAlgorithm class. Initializes an instance of the algorithm. It overrides HashAlgorithm.Initialize(). Generates a hash value for a section of a byte array and stores it at a specific offset in another byte array. Inherited from the System.Security.Cryptography.HashAlgorithm class Generates a hash value for a section of a byte array. Inherited from the System.Security.Cryptography.HashAlgorithm class.
ComputeHash
Initialize TransformBlock
TransformFinalBlock
There are two algorithms that provide the specific implementation for the hash algorithms: SHA-1 and SHA-256. Both algorithms can use a key of any length. The SHA-1 algorithm returns a hash value that is 20 bytes (160 bits), and SHA-256 returns a hash value that is 32 bytes (256 bits). As long as the same input bytes and the same key are used, the specific hash algorithm will always generate the same hash value. Here s a helper method that accepts a message (the input bytes) and the key as strings and will use any specific implementation of the HMAC class that you pass in: byte[] calculateHash(string key, string message, HMAC hashAlgorithm) { UTF8Encoding encoder = new UTF8Encoding(); hashAlgorithm.Key = encoder.GetBytes(key);
CHAPTER 15 SECURITY
byte[] hash = hashAlgorithm.ComputeHash(encoder.GetBytes(message)); //Convert the hash byte array to Base64 string string hashinbase64string = System.Convert.ToBase64String(hash); return (hash); } If we pass the string this is a secret message through the HMACSHA256 class, with the secret key p@ssw0rd, and then encode the resulting byte array as a Base64 string, we get the hash value an332+/NeHKDvNIKYiQOokci/ob1xK1eMJYS1yjtwfI=. If we capitalize the first t in the message, the hash value changes to IhbwZnSZXdw95cUbXprjSUAV9VBoFmKdOd9kYT/Et3Y=, which is a significant change. Even changing a single bit in the message or the key will cause a wildly different hash value to be generated.
Note The SHA-1 algorithm is now considered an unsecured algorithm, and SHA-2 (includes SHA-256 and SHA512 algorithms) is recommended instead. Thus, for Silverlight-based applications, it is recommended to utilize the SHA-256 algorithm instead of SHA-1. Note that Silverlight does not support the SHA-512 algorithm. You can get more details on the SHA algorithm by visiting http://en.wikipedia.org/wiki/SHA.
Encrypting/Decrypting Data
There are two types of encryption algorithms: symmetric key algorithms and asymmetric key algorithms. A symmetric key algorithm is an algorithm where the key used to encrypt information is the same key used for decryption. An asymmetric key algorithm uses separate keys for encryption and decryption, generally referred to as a public key (used for encryption; anyone can obtain the public key to encrypt data for a specific recipient) and a private key (this key is kept secret and used to decrypt data encrypted with the public key). Silverlight supports only one encryption algorithm, the symmetric key Advanced Encryption Standard (AES). The simplest approach to encrypting and decrypting information is to use a single password, as shown in Figure 15-7.
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