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diff --git a/test/web/http_sigs/http_sig_test.exs b/test/web/http_sigs/http_sig_test.exs
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+++ b/test/web/http_sigs/http_sig_test.exs
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+# http signatures
+# Test data from https://tools.ietf.org/html/draft-cavage-http-signatures-08#appendix-C
+defmodule Pleroma.Web.HTTPSignaturesTest do
+  use Pleroma.DataCase
+  alias Pleroma.Web.HTTPSignatures
+
+  @private_key (hd(:public_key.pem_decode(File.read!("test/web/http_sigs/priv.key")))
+    |> :public_key.pem_entry_decode())
+
+  @public_key (hd(:public_key.pem_decode(File.read!("test/web/http_sigs/pub.key")))
+    |> :public_key.pem_entry_decode())
+
+  @headers %{
+    "(request-target)" => "post /foo?param=value&pet=dog",
+    "host" => "example.com",
+    "date" => "Thu, 05 Jan 2014 21:31:40 GMT",
+    "content-type" => "application/json",
+    "digest" => "SHA-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=",
+    "content-length" => "18"
+  }
+
+  @body "{\"hello\": \"world\"}"
+
+  @default_signature """
+  keyId="Test",algorithm="rsa-sha256",signature="jKyvPcxB4JbmYY4mByyBY7cZfNl4OW9HpFQlG7N4YcJPteKTu4MWCLyk+gIr0wDgqtLWf9NLpMAMimdfsH7FSWGfbMFSrsVTHNTk0rK3usrfFnti1dxsM4jl0kYJCKTGI/UWkqiaxwNiKqGcdlEDrTcUhhsFsOIo8VhddmZTZ8w="
+  """
+
+  test "split up a signature" do
+    expected = %{
+      "keyId" => "Test",
+      "algorithm" => "rsa-sha256",
+      "signature" => "jKyvPcxB4JbmYY4mByyBY7cZfNl4OW9HpFQlG7N4YcJPteKTu4MWCLyk+gIr0wDgqtLWf9NLpMAMimdfsH7FSWGfbMFSrsVTHNTk0rK3usrfFnti1dxsM4jl0kYJCKTGI/UWkqiaxwNiKqGcdlEDrTcUhhsFsOIo8VhddmZTZ8w=",
+      "headers" => ["date"]
+    }
+
+    assert HTTPSignatures.split_signature(@default_signature) == expected
+  end
+
+  test "validates the default case" do
+    signature = HTTPSignatures.split_signature(@default_signature)
+    assert HTTPSignatures.validate(@headers, signature, @public_key)
+  end
+
+  test "it contructs a signing string" do
+    expected = "date: Thu, 05 Jan 2014 21:31:40 GMT\ncontent-length: 18"
+    assert expected == HTTPSignatures.build_signing_string(@headers, ["date", "content-length"])
+  end
+end