Signing Data
In order to sign data, a hash object must first be created using the
CryptCreateHash function. This object will accumulate the data to be signed. Next, the data
is added to the hash object with the
CryptHashData function.
After the last block of data is added to the hash, the
CryptSignHash function is used to sign the hash. A description of the data can also be added
to the hash object at this point. Once the digital signature data has been
obtained, the hash object should be destroyed with the
CryptDestroyHash function.
Hashes can be signed with either the signature private key or the key exchange
private key. The signature key should be used when the user who owns the
signature key is signing some of his or her data. The key exchange key should be
used when signing data that does not directly belong to the user. The classic
example of this is when the exchange key is used to sign session keys during a key
exchange protocol.
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