SHA1 Hashes {.en}

SHA1哈希 {.zh}

::: {.en} SHA1 hashes are frequently used to compute short identities for binary or text blobs. For example, the git revision control system uses SHA1s extensively to identify versioned files and directories. Here’s how to compute SHA1 hashes in Go. :::

::: {.zh}

[SHA1 hashes]（http://en.wikipedia.org/wiki/SHA-1）经常用于计算二进制文本blob的短标识。例如，[git revision controlsystem]（http://git-scm.com/）广泛使用SHA1来识别版本化文件和目录。以下是Go中如何计算SHA1哈希值。

:::

package main

::: {.en} Go implements several hash functions in various crypto/* packages. :::

::: {.zh}

Go在各种crypto / *包中实现了几个哈希函数。

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import "crypto/sha1"
import "fmt"
func main() {
    s := "sha1 this string"

::: {.en} The pattern for generating a hash is sha1.New(), sha1.Write(bytes), then sha1.Sum([]byte{}). Here we start with a new hash. :::

::: {.zh}

生成哈希的模式是sha1.New（），sha1.Write（bytes），然后是sha1.Sum（[] byte {}）。我们从一个新的哈希开始。

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    h := sha1.New()

::: {.en} Write expects bytes. If you have a string s, use []byte(s) to coerce it to bytes. :::

::: {.zh}

Write需要字节。如果你有一个字符串s，使用[] byte（s）将它强制转换为字节。

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    h.Write([]byte(s))

::: {.en} This gets the finalized hash result as a byte slice. The argument to Sum can be used to append to an existing byte slice: it usually isn’t needed. :::

::: {.zh}

这将最终的哈希结果作为字节片段获取。 “Sum”的参数可用于附加到现有的字节切片：通常不需要它。

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    bs := h.Sum(nil)

::: {.en} SHA1 values are often printed in hex, for example in git commits. Use the %x format verb to convert a hash results to a hex string. :::

::: {.zh}

SHA1值通常以十六进制格式打印，例如在git提交中。使用％x格式动词将哈希结果转换为十六进制字符串。

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    fmt.Println(s)
    fmt.Printf("%xn", bs)
}

::: {.en} Running the program computes the hash and prints it in a human-readable hex format. :::

::: {.zh}

运行程序计算哈希并以人类可读的十六进制格式打印。

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$ go run sha1-hashes.go
sha1 this string
cf23df2207d99a74fbe169e3eba035e633b65d94

::: {.en} You can compute other hashes using a similar pattern to the one shown above. For example, to compute MD5 hashes import crypto/md5 and use md5.New(). Note that if you need cryptographically secure hashes, you should carefully research hash strength! :::

::: {.zh}

您可以使用与上面显示的类似模式计算其他哈希值。例如，计算MD5 hashesimportcrypto / md5并使用md5.New（）。注意如果你需要加密安全哈希，你应该仔细研究[hash strength]（http://en.wikipedia.org/维基/ Cryptographic_hash_function）！

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go by example 中文文档

SHA1 哈希

SHA1 Hashes {.en}

SHA1哈希 {.zh}