用于检索“安全哈希算法”修订版的掩码，该修订版更正了SHA中的一个未发布的错误。

A mask used to retrieve a revision of the Secure Hash Algorithm that corrects an unpublished flaw in SHA.

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类型属性指出了hash算法，例如消息摘要算法5 (MD5)或安全哈希算法(SHA - 1)。

The type attribute indicates the hash algorithm, such as Message-Digest algorithm 5 (MD5) or Secure Hashing algorithm (SHA-1).

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要数字签署大型文件，首先使用这些算法用一种安全的方式压缩(计算固定长度的哈希码)文件，然后再用私钥签署。

For digitally signing large files, the files are first compressed (the fixed-length hash is calculated) in a secure manner using these algorithms, and then signed with the private key.

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