Available in all subroutines.

Returns a SHA-1-based message authentication code based on the supplied key and string s. The returned code is Base64-encoded.


declare local var.hmac_sha1_base64 STRING;
set var.hmac_sha1_base64 = digest.hmac_sha1_base64("key", "input");
# var.hmac_sha1_base64 is now "hRO7NVB2zOKuXrnzmatcr9unyKI="

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