diff --git a/board/sandbox/capsule_priv_key_bad.key b/board/sandbox/capsule_priv_key_bad.key
new file mode 100644
index 0000000000..2324f69ebd
--- /dev/null
+++ b/board/sandbox/capsule_priv_key_bad.key
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCmPw1pGd2xNW0p
+lesRXkkek3uwUB06Nt61tnZvpMkBKt4IokqGWz1tZls+Z2CqvwOfcsPZ27cPRYSu
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+/nbAkW8jdYpCjO9Z5PwwC92xYuvKmNGrLgSM8ZhhAoGAfgSZTpASXubM18E3ecfw
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+dFDo4PoyCStuF0w9SSzpIld01ZG0t7XqphY0DmshCXIXsqr7Vb4WrbBI7KX+b3Um
+BzmROfaSud97NjQ/RA26OZk=
+-----END PRIVATE KEY-----
diff --git a/board/sandbox/capsule_priv_key_good.key b/board/sandbox/capsule_priv_key_good.key
new file mode 100644
index 0000000000..9a37f59796
--- /dev/null
+++ b/board/sandbox/capsule_priv_key_good.key
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCwBfaV0P1jRzS6
+13U1T+4VbuMVsxFXhwHJY5z5Fx6v+cWBf3K1ruK+7cEnW55ZHXvNE2JCkjMvISKm
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+K3q1EZ1VW+rL2IqcQhog8P1CGHgb514f0x3yTo71AoGACGdb+Nb6lg8OSJPUcuuH
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+hxbHdScuiJdNWL9+FczOkylnKH3VEdG3RS5lGdyi6r+miTMs3h8WfzGp4JINysjg
+PUFskK36qGjASfkRUn0hizQ=
+-----END PRIVATE KEY-----
diff --git a/board/sandbox/capsule_pub_esl_good.esl b/board/sandbox/capsule_pub_esl_good.esl
new file mode 100644
index 0000000000000000000000000000000000000000..f8cc272309b2f80113c29e22bc9fdd5c767b4667
GIT binary patch
diff --git a/board/sandbox/capsule_pub_key_bad.crt b/board/sandbox/capsule_pub_key_bad.crt
new file mode 100644
index 0000000000..2e8e5d5828
--- /dev/null
+++ b/board/sandbox/capsule_pub_key_bad.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDDzCCAfegAwIBAgIUWw3vHYnrjoHUXytxSm2eYWzbYVAwDQYJKoZIhvcNAQEL
+BQAwFjEUMBIGA1UEAwwLVEVTVF9TSUdORVIwIBcNMjMwODA0MTgwODEyWhgPMzAw
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+YGQ5WhYMdHOOjWmcV6MDkCpiSA==
+-----END CERTIFICATE-----
diff --git a/board/sandbox/capsule_pub_key_good.crt b/board/sandbox/capsule_pub_key_good.crt
new file mode 100644
index 0000000000..82d8576a64
--- /dev/null
+++ b/board/sandbox/capsule_pub_key_good.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDDzCCAfegAwIBAgIUUzrWhMi7oPFshQP6eFlccqf7exswDQYJKoZIhvcNAQEL
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+I19t9pXyxAi6u7MRhJZlAeH/3w==
+-----END CERTIFICATE-----
