#1 SHA256Hmac如何使用？
procedure SHA256Hmac(Key: PAnsiChar; KeyLength: Integer; Input: PAnsiChar;
Length: LongWord; var Output: TSHA256Digest);

请问这个如何使用？在d10.2.1中，报以下错误，应该是我用法不对。。。

PS:SHA256Print(SHA256StringA(AnsiString(edtSha256.Text)));是正常的，计算结果也正确。

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Crypt/Decrypt DEMO
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Access violation at address 005F9D68 in module 'Project1.exe'. Read of address 40404040.
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