meta-aspeed: Add development key for socsec sign

Add a development (insecure, also known as 'imprint') key to
u-boot-aspeed-sdk that can be used through socsec for signing the SPL on
ASPEED AST2600 devices.

The keypair was generated according to socsec's documentation, using:
 $ openssl genrsa -out rsa_oem_dss_key.pem 4096
 $ openssl rsa -in rsa_oem_dss_key.pem -pubout \
       -out rsa_pub_oem_dss_key.pem

Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
Change-Id: I9c03ed9603d7362e033862dd1e5138ba7164f13d
diff --git a/meta-aspeed/recipes-bsp/u-boot/files/rsa_oem_dss_key.pem b/meta-aspeed/recipes-bsp/u-boot/files/rsa_oem_dss_key.pem
new file mode 100644
index 0000000..a3474c4
--- /dev/null
+++ b/meta-aspeed/recipes-bsp/u-boot/files/rsa_oem_dss_key.pem
@@ -0,0 +1,59 @@
+# U-Boot SPL 'Insecure' key (also known as 'development' or
+# 'imprint' key), used to sign development images of the ASPEED
+# AST2600 boards' U-boot SPL. This key SHOULD NOT be used to
+# sign production images.
+# This key is 4096 bits in size and any key overriding it must
+# also change the SOCSEC_SIGN_ALGO variable.
+# See meta-aspeed/classes/socsec-sign.bbclass for more info.
+
+-----BEGIN RSA PRIVATE KEY-----
+MIIJKQIBAAKCAgEA6hC1IHlB4SqRbesC8BtC00icAYUuYmAiO6CHCyph2Pv2CQT5
+Yct8WSKA/6kNAUpsJwlM18ZX0yMcGVZeS9058hgZdMgoDC57Jw5Tw5foN6CBBF72
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+c4XKN2hkZb4MP95cE4rh7DGodZDW5KjiViXHVExUrdv3jBoZlX+Af6atm0K0
+-----END RSA PRIVATE KEY-----
diff --git a/meta-aspeed/recipes-bsp/u-boot/files/rsa_pub_oem_dss_key.pem b/meta-aspeed/recipes-bsp/u-boot/files/rsa_pub_oem_dss_key.pem
new file mode 100644
index 0000000..e380017
--- /dev/null
+++ b/meta-aspeed/recipes-bsp/u-boot/files/rsa_pub_oem_dss_key.pem
@@ -0,0 +1,18 @@
+# Public portion of the U-Boot SPL 'Insecure' key kept here
+# as a convenience.
+# Please refer to 'rsa_oem_dss_key.pem' for more info
+
+-----BEGIN PUBLIC KEY-----
+MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA6hC1IHlB4SqRbesC8BtC
+00icAYUuYmAiO6CHCyph2Pv2CQT5Yct8WSKA/6kNAUpsJwlM18ZX0yMcGVZeS905
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++ubxzwUm0PrYGIhowuPItT7/ASqzxCKa/dfYVCTlPSJOP+Wi00pJBZOFuDk4HHao
+98BCUeGE4t065Di81GZ2F9amf5B//jIjkM3o9vrThe3GWbWtP3kmw7OQyMeUzUKx
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+yrzEctuzky80lHcVFYnE/3cCAwEAAQ==
+-----END PUBLIC KEY-----
diff --git a/meta-aspeed/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bb b/meta-aspeed/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bb
index 54884b0..727c62d 100644
--- a/meta-aspeed/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bb
+++ b/meta-aspeed/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bb
@@ -9,6 +9,10 @@
 DEPENDS += "bc-native dtc-native"
 
 SRC_URI_append_df-phosphor-mmc = " file://u-boot-env-ast2600.txt"
+SRC_URI += " \
+            file://rsa_oem_dss_key.pem;sha256sum=64a379979200d39949d3e5b0038e3fdd5548600b2f7077a17e35422336075ad4 \
+            file://rsa_pub_oem_dss_key.pem;sha256sum=40132a694a10af2d1b094b1cb5adab4d6b4db2a35e02d848b2b6a85e60738264 \
+           "
 
 UBOOT_ENV_SIZE_df-phosphor-mmc = "0x10000"
 UBOOT_ENV_df-phosphor-mmc = "u-boot-env"