# HMACSHA1
`HMACSHA1(Text, Secret, [Format]) {String}`
`Text`-`{String}`
`Secret`-`{String}`
`Format`-`{String}` *可选* `"Hex"` 或`"Base64"` 编码结果
使用SHA1哈希算法确定给定文本和密钥的HMAC。
~~~vb
WebHelpers.HMACSHA1 "Howdy!", "Secret"
'// -> c8fdf74a9d62aa41ac8136a1af471cec028fb157
~~~
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