pk_write test cases with short/long private key
Add pk_write test cases where the ASN.1 INTEGER encoding of the
private value does not have the mandatory size for the OCTET STRING
that contains the value.
ec_256_long_prv.pem is a random secp256r1 private key, selected so
that the private value is >= 2^255, i.e. the top bit of the first byte
is set (which would cause the INTEGER encoding to have an extra
leading 0 byte).
ec_521_short_prv.pem is a random secp521r1 private key, selected so
that the private value is < 2^518, i.e. the first byte is zero and the
top bit of the second byte is 0 (which would cause the INTEGER
encoding to have one less 0 byte at the start).
diff --git a/tests/data_files/ec_256_long_prv.pem b/tests/data_files/ec_256_long_prv.pem
new file mode 100644
index 0000000..5141e30
--- /dev/null
+++ b/tests/data_files/ec_256_long_prv.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIIcex4mqXsQamUKTVf8vXmTAJrQvGjh5mXG8p9+OR4xAoAoGCCqGSM49
+AwEHoUQDQgAEqJ2HQjPpc6fDwE/vSa6U35USXawkTo98y4U6NsAl+rOGuqMPEFXf
+P1Srm/Jrzwa/RuppRL5kgyAsGJTUmwZEzQ==
+-----END EC PRIVATE KEY-----
diff --git a/tests/data_files/ec_521_short_prv.pem b/tests/data_files/ec_521_short_prv.pem
new file mode 100644
index 0000000..427b7ad
--- /dev/null
+++ b/tests/data_files/ec_521_short_prv.pem
@@ -0,0 +1,7 @@
+-----BEGIN EC PRIVATE KEY-----
+MIHcAgEBBEIAOXdk7W+Hf5L7Hc9fKe44wmpaRNs5ERFTkv5CrlXv/Bu3y28M673q
+vBNo7a/UE/6NNQHu2pQODEYFpMg6R34b5SigBwYFK4EEACOhgYkDgYYABAFUMHXV
+KPA4vkMgq+pFgDoH96XoM517gF2GJFV6h2gLhykzIHL/otAyEpAStw7MBvbU0V21
+ixB+hjqzO7Snxaj9mwB8g87OKxm5eGfsqvJNPdJ0RZ/EKy06Ukg6KThlhQeyrtIk
+g5PTCrPnNszlffAy6/jCOe3Moi59g15H13sSzwfX6g==
+-----END EC PRIVATE KEY-----
diff --git a/tests/suites/test_suite_pkwrite.data b/tests/suites/test_suite_pkwrite.data
index c8ff177..16d0dd6 100644
--- a/tests/suites/test_suite_pkwrite.data
+++ b/tests/suites/test_suite_pkwrite.data
@@ -30,10 +30,18 @@
depends_on:MBEDTLS_ECP_C:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_SECP192R1_ENABLED
pk_write_key_check:"data_files/ec_prv.sec1.pem"
+Private key write check EC 256 bits (top bit set)
+depends_on:MBEDTLS_ECP_C:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_SECP192R1_ENABLED
+pk_write_key_check:"data_files/ec_256_long_prv.pem"
+
Private key write check EC 521 bits
depends_on:MBEDTLS_ECP_C:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_SECP521R1_ENABLED
pk_write_key_check:"data_files/ec_521_prv.pem"
+Private key write check EC 521 bits (top byte is 0)
+depends_on:MBEDTLS_ECP_C:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_SECP521R1_ENABLED
+pk_write_key_check:"data_files/ec_521_short_prv.pem"
+
Private key write check EC Brainpool 512 bits
depends_on:MBEDTLS_ECP_C:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_BP512R1_ENABLED
pk_write_key_check:"data_files/ec_bp512_prv.pem"