diff --git a/data_files/Makefile b/data_files/Makefile
index 476c56142..48e836773 100644
--- a/data_files/Makefile
+++ b/data_files/Makefile
@@ -1635,6 +1635,10 @@ ec_prv.pk8.der:
 	$(OPENSSL) genpkey -algorithm EC -pkeyopt ec_paramgen_curve:prime192v1 -pkeyopt ec_param_enc:named_curve -out $@ -outform DER
 all_final += ec_prv.pk8.der
 
+ec_256_prv.pk8.der:
+	$(OPENSSL) genpkey -algorithm EC -pkeyopt ec_paramgen_curve:prime256v1 -pkeyopt ec_param_enc:named_curve -out $@ -outform DER
+all_final += ec_256_prv.pk8.der
+
 # ### Instructions for creating `ec_prv.pk8nopub.der`,
 # ### `ec_prv.pk8nopubparam.der`, and `ec_prv.pk8param.der` by hand from
 # ### `ec_prv.pk8.der`.
@@ -1694,6 +1698,9 @@ all_final += ec_prv.pk8.der
 ec_prv.pk8.pem: ec_prv.pk8.der
 	$(OPENSSL) pkey -in $< -inform DER -out $@
 all_final += ec_prv.pk8.pem
+ec_256_prv.pk8.pem: ec_256_prv.pk8.der
+	$(OPENSSL) pkey -in $< -outform PEM -out $@
+all_final += ec_256_prv.pk8.pem
 ec_prv.pk8nopub.pem: ec_prv.pk8nopub.der
 	$(OPENSSL) pkey -in $< -inform DER -out $@
 all_final += ec_prv.pk8nopub.pem
diff --git a/data_files/ec_256_prv.pk8.der b/data_files/ec_256_prv.pk8.der
new file mode 100644
index 000000000..5f7c3a5c9
--- /dev/null
+++ b/data_files/ec_256_prv.pk8.der
@@ -0,0 +1,5 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgfudpOVgKLbhYchqT
+OKGwquNHzbXu6Ftboqiz+7vWkFShRANCAASnNM81vPFrIDRSxd9q1KdnmCEKYY+f
+9cAHHHwPyWm6JIUGtE8dKTR15ECaVosFCUNuhS3ZZ7yJepqXUXISbMO5
+-----END PRIVATE KEY-----
diff --git a/data_files/ec_256_prv.pk8.pem b/data_files/ec_256_prv.pk8.pem
new file mode 100644
index 000000000..5f7c3a5c9
--- /dev/null
+++ b/data_files/ec_256_prv.pk8.pem
@@ -0,0 +1,5 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgfudpOVgKLbhYchqT
+OKGwquNHzbXu6Ftboqiz+7vWkFShRANCAASnNM81vPFrIDRSxd9q1KdnmCEKYY+f
+9cAHHHwPyWm6JIUGtE8dKTR15ECaVosFCUNuhS3ZZ7yJepqXUXISbMO5
+-----END PRIVATE KEY-----