implements sha1 hash interpolation func

[jkordish]

Adds functionality to convert a string to a sha1 hash.

Example: obfuscating the name used for the various terraform provider resources.

For instance:

resource "aws_s3_bucket" "customer-bucket" {
    bucket = "${sha1(concat(aws_vpc.default.tags.cust-id, "-s3-bucket"))}"
    tags {
        Name = "${sha1(concat(aws_vpc.default.tags.cust-id, "-s3-bucket"))}"
        designation = "${var.designation}"
        env = "${var.env}"
        mgmt = "${var.mgmt}"
        product = "${var.product}"
        vpc-id = "${aws_vpc.default.id}"
    }
}

Tested against master and works as intended.

[phinze]

Looking good! Can you add the function to the docs as well?

[jkordish]

@phinze done.:)

[phinze]

Nice - thank you!

[ghost]

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