diff --git a/data_files/Makefile b/data_files/Makefile
index 142d3ab09..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
@@ -1752,6 +1759,10 @@ ec_256_pub.comp.pem: ec_256_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
 all_final += ec_256_pub.comp.pem
 
+ec_256_pub.der: ec_256_prv.sec1.der
+	$(OPENSSL) ec -in $< -outform DER -pubout -out $@
+all_final += ec_256_pub.der
+
 ec_384_pub.comp.pem: ec_384_pub.pem
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
 all_final += ec_384_pub.comp.pem
@@ -1839,6 +1850,19 @@ ec_prv.sec1.der: ec_prv.sec1.pem
 	$(OPENSSL) pkey -in $< -out $@ -outform DER
 all_final += ec_prv.sec1.der
 
+ec_256_prv.sec1.der:
+	$(OPENSSL) ecparam -name prime256v1 -genkey -outform DER -noout -out $@
+all_final += ec_256_prv.sec1.der
+
+ec_256_prv.sec1.pem:
+	$(OPENSSL) ec -in $< -out $@ -outform PEM
+all_final += ec_256_prv.sec1.pem
+
+ec_256_prv.sec1.comp.pem:
+	$(OPENSSL) ec -in $< -out $@ -outform PEM
+	$(OPENSSL) ec -in $< -conv_form compressed -outform PEM -out $@
+all_final += ec_256_prv.sec1.pem
+
 ec_256_long_prv.der: ec_256_long_prv.pem
 	$(OPENSSL) pkey -in $< -out $@ -outform DER
 all_final += ec_256_long_prv.der
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-----
diff --git a/data_files/ec_256_prv.sec1.comp.pem b/data_files/ec_256_prv.sec1.comp.pem
new file mode 100644
index 000000000..86bfed8d0
--- /dev/null
+++ b/data_files/ec_256_prv.sec1.comp.pem
@@ -0,0 +1,4 @@
+-----BEGIN EC PRIVATE KEY-----
+MFcCAQEEIHnN8ULAX3r6RNctg8/Hfll6p/QgJXJ6Y4XgsLeJbWV8oAoGCCqGSM49
+AwEHoSQDIgACCEh3UFIe6UZVzKk6zmLN74VtxjvoVZYxs4WckNUPGSY=
+-----END EC PRIVATE KEY-----
diff --git a/data_files/ec_256_prv.sec1.der b/data_files/ec_256_prv.sec1.der
new file mode 100644
index 000000000..e1da3985b
Binary files /dev/null and b/data_files/ec_256_prv.sec1.der differ
diff --git a/data_files/ec_256_prv.sec1.pem b/data_files/ec_256_prv.sec1.pem
new file mode 100644
index 000000000..69b02225a
--- /dev/null
+++ b/data_files/ec_256_prv.sec1.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIHnN8ULAX3r6RNctg8/Hfll6p/QgJXJ6Y4XgsLeJbWV8oAoGCCqGSM49
+AwEHoUQDQgAECEh3UFIe6UZVzKk6zmLN74VtxjvoVZYxs4WckNUPGSaYbGCf7xGr
+DKjYXOp+5gSGxtCLBAltIFHd4ctGTyFaWg==
+-----END EC PRIVATE KEY-----
diff --git a/data_files/ec_256_pub.der b/data_files/ec_256_pub.der
new file mode 100644
index 000000000..91056e4b5
Binary files /dev/null and b/data_files/ec_256_pub.der differ