Add sample encryption keys

This adds both RSA (pub + private) keys and a base64 encoded AES-128
secret key, which should be used as sample keys in encrypted image tests.

Signed-off-by: Fabio Utzig <utzig@apache.org>

enc-aes128kw.b64

@@ -0,0 +1 @@
+0VoElcTCqP8weM5Jtfyy3Q==

enc-rsa2048-priv.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

enc-rsa2048-pub.pem

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtCYUST0WEzptnISpi2oQ
+IGHvSASkSyTzADKsIuAwJ3AY5VXIuAU0A7D4pZbSSFjvcLAJ2+NYYu+ZYwGyicSz
+9p5iv03CitDJTUOj2OUd7GJjCOIgpfx40D50yKQbNq179QauTVGbQM4wT2zq+el0
+6gbunOQUaCC5PecRFIslo/9MivNT7ms+7zTNaj9iaMD/eEyww+aWYfwfGPF6guKP
+NagrhhakRvusfkHbAgWRbd/B3hOVnPmeXnK6pyWT+9zoq4ZFiEct7e7ul57OXZsE
+BEB8y3w9LHSrpMxko1yVPdSi3JKyyBjL+QA5gY+PQMLfmSmsisI72KTyra90wBHH
+mQIDAQAB
+-----END PUBLIC KEY-----