Ruby SHA2摘要我的IRB中的文件或问题不正确？

doc@显示：

这是我在

2.1.3

中的输出：

Digest::SHA256.new.digest_length * 8
 #=> 256 
Digest::SHA384.new.digest_length * 8
 #=> 384 
Digest::SHA512.new.digest_length * 8
 #=> 512

---

为什么我的块长度输出与Ruby文档不同？

文档中似乎有输入错误，看

block_length → Integer
Returns the block length of the digest in bytes.

Digest::SHA256.new.digest_length * 8
# => 512
Digest::SHA384.new.digest_length * 8
# => 1024
Digest::SHA512.new.digest_length * 8
# => 1024

digest_length → Integer
Returns the length of the hash value of the digest in bytes.

Digest::SHA256.new.digest_length * 8
# => 256
Digest::SHA384.new.digest_length * 8
# => 384
Digest::SHA512.new.digest_length * 8
# => 512

在示例中，两者都使用了

digest\u length

但是应该是,

block_length → Integer
Returns the block length of the digest in bytes.

Digest::SHA256.new.block_length * 8
# => 512
Digest::SHA384.new.block_length * 8
# => 1024
Digest::SHA512.new.block_length * 8
# => 1024

digest_length → Integer
Returns the length of the hash value of the digest in bytes.

Digest::SHA256.new.digest_length * 8
# => 256
Digest::SHA384.new.digest_length * 8
# => 384
Digest::SHA512.new.digest_length * 8
# => 512

（）

Ruby 1.9.3文档中关于该方法的描述似乎有误，因为在示例中，他们使用的是

digest\u length

方法，而不是

block\u length

使用

digest_block

实际获取显示的值

512

、

1024

、和

1024

：

Digest::SHA256.new.block_length * 8
# => 512

Digest::SHA384.new.block_length * 8
# => 1024

Digest::SHA512.new.block_length * 8
# => 1024

Digest::SHA256.new.block_length * 8
# => 512

Digest::SHA384.new.block_length * 8
# => 1024

Digest::SHA512.new.block_length * 8
# => 1024