diff --git a/library/certs.c b/library/certs.c
index ffe6bc9..5c01998 100644
--- a/library/certs.c
+++ b/library/certs.c
@@ -47,6 +47,7 @@
 "uCjn8pwUOkABXK8Mss90fzCfCEOtIA==\r\n"                                  \
 "-----END CERTIFICATE-----\r\n"
 const char mbedtls_test_ca_crt_ec[] = TEST_CA_CRT_EC;
+const size_t mbedtls_test_ca_crt_ec_len = sizeof( mbedtls_test_ca_crt_ec );
 
 const char mbedtls_test_ca_key_ec[] =
 "-----BEGIN EC PRIVATE KEY-----\r\n"
@@ -58,8 +59,10 @@
 "UsuWTITwJImcnlAs1gaRZ3sAWm7cOUidL0fo2G0fYUFNcYoCSLffCFTEHBuPnagb\r\n"
 "a77x/sY1Bvii8S9/XhDTb6pTMx06wzrm\r\n"
 "-----END EC PRIVATE KEY-----\r\n";
+const size_t mbedtls_test_ca_key_ec_len = sizeof( mbedtls_test_ca_key_ec );
 
 const char mbedtls_test_ca_pwd_ec[] = "PolarSSLTest";
+const size_t mbedtls_test_ca_pwd_ec_len = sizeof( mbedtls_test_ca_pwd_ec ) - 1;
 
 const char mbedtls_test_srv_crt_ec[] =
 "-----BEGIN CERTIFICATE-----\r\n"
@@ -76,6 +79,7 @@
 "C12r0Lz3ri/moSEpNZWqPjkCMCE2f53GXcYLqyfyJR078c/xNSUU5+Xxl7VZ414V\r\n"
 "fGa5kHvHARBPc8YAIVIqDvHH1Q==\r\n"
 "-----END CERTIFICATE-----\r\n";
+const size_t mbedtls_test_srv_crt_ec_len = sizeof( mbedtls_test_srv_crt_ec );
 
 const char mbedtls_test_srv_key_ec[] =
 "-----BEGIN EC PRIVATE KEY-----\r\n"
@@ -83,6 +87,7 @@
 "AwEHoUQDQgAEN8xW2XYJHlpyPsdZLf8gbu58+QaRdNCtFLX3aCJZYpJO5QDYIxH/\r\n"
 "6i/SNF1dFr2KiMJrdw1VzYoqDvoByLTt/w==\r\n"
 "-----END EC PRIVATE KEY-----\r\n";
+const size_t mbedtls_test_srv_key_ec_len = sizeof( mbedtls_test_srv_key_ec );
 
 const char mbedtls_test_cli_crt_ec[] =
 "-----BEGIN CERTIFICATE-----\r\n"
@@ -99,6 +104,7 @@
 "lgOsjnhw3fIOoLIWy2WOGsk/LGF++DzvrRzuNiACMQCd8iem1XS4JK7haj8xocpU\r\n"
 "LwjQje5PDGHfd3h9tP38Qknu5bJqws0md2KOKHyeV0U=\r\n"
 "-----END CERTIFICATE-----\r\n";
+const size_t mbedtls_test_cli_crt_ec_len = sizeof( mbedtls_test_cli_crt_ec );
 
 const char mbedtls_test_cli_key_ec[] =
 "-----BEGIN EC PRIVATE KEY-----\r\n"
@@ -106,20 +112,12 @@
 "AwEHoUQDQgAEV+WusXPf06y7k7iB/xKu7uZTrM5VU/Y0Dswu42MlC9+Y4vNcYDaW\r\n"
 "wNUYFHDlf5/VS0UY5bBs1Vz4lo+HcKPkxw==\r\n"
 "-----END EC PRIVATE KEY-----\r\n";
-
-const size_t mbedtls_test_ca_crt_ec_len  = sizeof( mbedtls_test_ca_crt_ec );
-const size_t mbedtls_test_ca_key_ec_len  = sizeof( mbedtls_test_ca_key_ec );
-const size_t mbedtls_test_ca_pwd_ec_len  = sizeof( mbedtls_test_ca_pwd_ec ) - 1;
-const size_t mbedtls_test_srv_crt_ec_len = sizeof( mbedtls_test_srv_crt_ec );
-const size_t mbedtls_test_srv_key_ec_len = sizeof( mbedtls_test_srv_key_ec );
-const size_t mbedtls_test_cli_crt_ec_len = sizeof( mbedtls_test_cli_crt_ec );
 const size_t mbedtls_test_cli_key_ec_len = sizeof( mbedtls_test_cli_key_ec );
-#else
-#define TEST_CA_CRT_EC
 #endif /* MBEDTLS_ECDSA_C */
 
 #if defined(MBEDTLS_RSA_C)
-#define TEST_CA_CRT_RSA                                                 \
+#if defined(MBEDTLS_SHA1_C)
+#define TEST_CA_CRT_RSA_SHA1                                            \
 "-----BEGIN CERTIFICATE-----\r\n"                                       \
 "MIIDhzCCAm+gAwIBAgIBADANBgkqhkiG9w0BAQUFADA7MQswCQYDVQQGEwJOTDER\r\n"  \
 "MA8GA1UEChMIUG9sYXJTU0wxGTAXBgNVBAMTEFBvbGFyU1NMIFRlc3QgQ0EwHhcN\r\n"  \
@@ -141,7 +139,34 @@
 "m/UTSLBNFNHesiTZeH31NcxYGdHSme9Nc/gfidRa0FLOCfWxRlFqAI47zG9jAQCZ\r\n"  \
 "7Z2mCGDNMhjQc+BYcdnl0lPXjdDK6V0qCg1dVewhUBcW5gZKzV7e9+DpVA==\r\n"      \
 "-----END CERTIFICATE-----\r\n"
-const char mbedtls_test_ca_crt_rsa[] = TEST_CA_CRT_RSA;
+static const char mbedtls_test_ca_crt_rsa_sha1[] = TEST_CA_CRT_RSA_SHA1;
+#endif
+
+#if defined(MBEDTLS_SHA256_C)
+#define TEST_CA_CRT_RSA_SHA256                                          \
+"-----BEGIN CERTIFICATE-----\r\n"                                       \
+"MIIDhzCCAm+gAwIBAgIBADANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER\r\n"  \
+"MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN\r\n"  \
+"MTcwNTA0MTY1NzAxWhcNMjcwNTA1MTY1NzAxWjA7MQswCQYDVQQGEwJOTDERMA8G\r\n"  \
+"A1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwggEiMA0G\r\n"  \
+"CSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDA3zf8F7vglp0/ht6WMn1EpRagzSHx\r\n"  \
+"mdTs6st8GFgIlKXsm8WL3xoemTiZhx57wI053zhdcHgH057Zk+i5clHFzqMwUqny\r\n"  \
+"50BwFMtEonILwuVA+T7lpg6z+exKY8C4KQB0nFc7qKUEkHHxvYPZP9al4jwqj+8n\r\n"  \
+"YMPGn8u67GB9t+aEMr5P+1gmIgNb1LTV+/Xjli5wwOQuvfwu7uJBVcA0Ln0kcmnL\r\n"  \
+"R7EUQIN9Z/SG9jGr8XmksrUuEvmEF/Bibyc+E1ixVA0hmnM3oTDPb5Lc9un8rNsu\r\n"  \
+"KNF+AksjoBXyOGVkCeoMbo4bF6BxyLObyavpw/LPh5aPgAIynplYb6LVAgMBAAGj\r\n"  \
+"gZUwgZIwHQYDVR0OBBYEFLRa5KWz3tJS9rnVppUP6z68x/3/MGMGA1UdIwRcMFqA\r\n"  \
+"FLRa5KWz3tJS9rnVppUP6z68x/3/oT+kPTA7MQswCQYDVQQGEwJOTDERMA8GA1UE\r\n"  \
+"CgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0GCAQAwDAYDVR0T\r\n"  \
+"BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAHK/HHrTZMnnVMpde1io+voAtql7j\r\n"  \
+"4sRhLrjD7o3THtwRbDa2diCvpq0Sq23Ng2LMYoXsOxoL/RQK3iN7UKxV3MKPEr0w\r\n"  \
+"XQS+kKQqiT2bsfrjnWMVHZtUOMpm6FNqcdGm/Rss3vKda2lcKl8kUnq/ylc1+QbB\r\n"  \
+"G6A6tUvQcr2ZyWfVg+mM5XkhTrOOXus2OLikb4WwEtJTJRNE0f+yPODSUz0/vT57\r\n"  \
+"ApH0CnB80bYJshYHPHHymOtleAB8KSYtqm75g/YNobjnjB6cm4HkW3OZRVIl6fYY\r\n"  \
+"n20NRVA1Vjs6GAROr4NqW4k/+LofY9y0LLDE+p0oIEKXIsIvhPr39swxSA==\r\n"      \
+"-----END CERTIFICATE-----\r\n"
+static const char mbedtls_test_ca_crt_rsa_sha256[] = TEST_CA_CRT_RSA_SHA256;
+#endif
 
 const char mbedtls_test_ca_key_rsa[] =
 "-----BEGIN RSA PRIVATE KEY-----\r\n"
@@ -174,8 +199,10 @@
 "wN48lslbHnqqagr6Xm1nNOSVl8C/6kbJEsMpLhAezfRtGwvOucoaE+WbeUNolGde\r\n"
 "P/eQiddSf0brnpiLJRh7qZrl9XuqYdpUqnoEdMAfotDOID8OtV7gt8a48ad8VPW2\r\n"
 "-----END RSA PRIVATE KEY-----\r\n";
+const size_t mbedtls_test_ca_key_rsa_len = sizeof( mbedtls_test_ca_key_rsa );
 
 const char mbedtls_test_ca_pwd_rsa[] = "PolarSSLTest";
+const size_t mbedtls_test_ca_pwd_rsa_len = sizeof( mbedtls_test_ca_pwd_rsa ) - 1;
 
 const char mbedtls_test_srv_crt_rsa[] =
 "-----BEGIN CERTIFICATE-----\r\n"
@@ -198,6 +225,7 @@
 "RRQfaD8neM9c1S/iJ/amTVqJxA1KOdOS5780WhPfSArA+g4qAmSjelc3p4wWpha8\r\n"
 "zhuYwjVuX6JHG0c=\r\n"
 "-----END CERTIFICATE-----\r\n";
+const size_t mbedtls_test_srv_crt_rsa_len = sizeof( mbedtls_test_srv_crt_rsa );
 
 const char mbedtls_test_srv_key_rsa[] =
 "-----BEGIN RSA PRIVATE KEY-----\r\n"
@@ -227,27 +255,29 @@
 "4AgahOxIxXx2gxJnq3yfkJfIjwf0s2DyP0kY2y6Ua1OeomPeY9mrIS4tCuDQ6LrE\r\n"
 "TB6l9VGoxJL4fyHnZb8L5gGvnB1bbD8cL6YPaDiOhcRseC9vBiEuVg==\r\n"
 "-----END RSA PRIVATE KEY-----\r\n";
+const size_t mbedtls_test_srv_key_rsa_len = sizeof( mbedtls_test_srv_key_rsa );
 
-const char mbedtls_test_cli_crt_rsa[] =
+static const char mbedtls_test_cli_crt_rsa_sha256[] =
 "-----BEGIN CERTIFICATE-----\r\n"
-"MIIDPzCCAiegAwIBAgIBBDANBgkqhkiG9w0BAQUFADA7MQswCQYDVQQGEwJOTDER\r\n"
-"MA8GA1UEChMIUG9sYXJTU0wxGTAXBgNVBAMTEFBvbGFyU1NMIFRlc3QgQ0EwHhcN\r\n"
-"MTEwMjEyMTQ0NDA3WhcNMjEwMjEyMTQ0NDA3WjA8MQswCQYDVQQGEwJOTDERMA8G\r\n"
-"A1UEChMIUG9sYXJTU0wxGjAYBgNVBAMTEVBvbGFyU1NMIENsaWVudCAyMIIBIjAN\r\n"
+"MIIDhTCCAm2gAwIBAgIBBDANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER\r\n"
+"MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN\r\n"
+"MTcwNTA1MTMwNzU5WhcNMjcwNTA2MTMwNzU5WjA8MQswCQYDVQQGEwJOTDERMA8G\r\n"
+"A1UECgwIUG9sYXJTU0wxGjAYBgNVBAMMEVBvbGFyU1NMIENsaWVudCAyMIIBIjAN\r\n"
 "BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyHTEzLn5tXnpRdkUYLB9u5Pyax6f\r\n"
 "M60Nj4o8VmXl3ETZzGaFB9X4J7BKNdBjngpuG7fa8H6r7gwQk4ZJGDTzqCrSV/Uu\r\n"
 "1C93KYRhTYJQj6eVSHD1bk2y1RPD0hrt5kPqQhTrdOrA7R/UV06p86jt0uDBMHEw\r\n"
 "MjDV0/YI0FZPRo7yX/k9Z5GIMC5Cst99++UMd//sMcB4j7/Cf8qtbCHWjdmLao5v\r\n"
 "4Jv4EFbMs44TFeY0BGbH7vk2DmqV9gmaBmf0ZXH4yqSxJeD+PIs1BGe64E92hfx/\r\n"
 "/DZrtenNLQNiTrM9AM+vdqBpVoNq0qjU51Bx5rU2BXcFbXvI5MT9TNUhXwIDAQAB\r\n"
-"o00wSzAJBgNVHRMEAjAAMB0GA1UdDgQWBBRxoQBzckAvVHZeM/xSj7zx3WtGITAf\r\n"
-"BgNVHSMEGDAWgBS0WuSls97SUva51aaVD+s+vMf9/zANBgkqhkiG9w0BAQUFAAOC\r\n"
-"AQEAAn86isAM8X+mVwJqeItt6E9slhEQbAofyk+diH1Lh8Y9iLlWQSKbw/UXYjx5\r\n"
-"LLPZcniovxIcARC/BjyZR9g3UwTHNGNm+rwrqa15viuNOFBchykX/Orsk02EH7NR\r\n"
-"Alw5WLPorYjED6cdVQgBl9ot93HdJogRiXCxErM7NC8/eP511mjq+uLDjLKH8ZPQ\r\n"
-"8I4ekHJnroLsDkIwXKGIsvIBHQy2ac/NwHLCQOK6mfum1pRx52V4Utu5dLLjD5bM\r\n"
-"xOBC7KU4xZKuMXXZM6/93Yb51K/J4ahf1TxJlTWXtnzDr9saEYdNy2SKY/6ZiDNH\r\n"
-"D+stpAKiQLAWaAusIWKYEyw9MQ==\r\n"
+"o4GSMIGPMB0GA1UdDgQWBBRxoQBzckAvVHZeM/xSj7zx3WtGITBjBgNVHSMEXDBa\r\n"
+"gBS0WuSls97SUva51aaVD+s+vMf9/6E/pD0wOzELMAkGA1UEBhMCTkwxETAPBgNV\r\n"
+"BAoMCFBvbGFyU1NMMRkwFwYDVQQDDBBQb2xhclNTTCBUZXN0IENBggEAMAkGA1Ud\r\n"
+"EwQCMAAwDQYJKoZIhvcNAQELBQADggEBAC7yO786NvcHpK8UovKIG9cB32oSQQom\r\n"
+"LoR0eHDRzdqEkoq7yGZufHFiRAAzbMqJfogRtxlrWAeB4y/jGaMBV25IbFOIcH2W\r\n"
+"iCEaMMbG+VQLKNvuC63kmw/Zewc9ThM6Pa1Hcy0axT0faf1B/U01j0FIcw/6mTfK\r\n"
+"D8w48OIwc1yr0JtutCVjig5DC0yznGMt32RyseOLcUe+lfq005v2PAiCozr5X8rE\r\n"
+"ofGZpiM2NqRPePgYy+Vc75Zk28xkRQq1ncprgQb3S4vTsZdScpM9hLf+eMlrgqlj\r\n"
+"c5PLSkXBeLE5+fedkyfTaLxxQlgCpuoOhKBm04/R1pWNzUHyqagjO9Q=\r\n"
 "-----END CERTIFICATE-----\r\n";
 
 const char mbedtls_test_cli_key_rsa[] =
@@ -278,28 +308,32 @@
 "bHFVW2r0dBTqegP2/KTOxKzaHfC1qf0RGDsUoJCNJrd1cwoCLG8P2EF4w3OBrKqv\r\n"
 "8u4ytY0F+Vlanj5lm3TaoHSVF1+NWPyOTiwevIECGKwSxvlki4fDAA==\r\n"
 "-----END RSA PRIVATE KEY-----\r\n";
-
-const size_t mbedtls_test_ca_crt_rsa_len  = sizeof( mbedtls_test_ca_crt_rsa );
-const size_t mbedtls_test_ca_key_rsa_len  = sizeof( mbedtls_test_ca_key_rsa );
-const size_t mbedtls_test_ca_pwd_rsa_len  = sizeof( mbedtls_test_ca_pwd_rsa ) - 1;
-const size_t mbedtls_test_srv_crt_rsa_len = sizeof( mbedtls_test_srv_crt_rsa );
-const size_t mbedtls_test_srv_key_rsa_len = sizeof( mbedtls_test_srv_key_rsa );
-const size_t mbedtls_test_cli_crt_rsa_len = sizeof( mbedtls_test_cli_crt_rsa );
 const size_t mbedtls_test_cli_key_rsa_len = sizeof( mbedtls_test_cli_key_rsa );
-#else
-#define TEST_CA_CRT_RSA
 #endif /* MBEDTLS_RSA_C */
 
 #if defined(MBEDTLS_PEM_PARSE_C)
 /* Concatenation of all available CA certificates */
-const char mbedtls_test_cas_pem[] = TEST_CA_CRT_RSA TEST_CA_CRT_EC;
+const char mbedtls_test_cas_pem[] =
+#ifdef TEST_CA_CRT_RSA_SHA1
+    TEST_CA_CRT_RSA_SHA1
+#endif
+#ifdef TEST_CA_CRT_RSA_SHA256
+    TEST_CA_CRT_RSA_SHA256
+#endif
+#ifdef TEST_CA_CRT_EC
+    TEST_CA_CRT_EC
+#endif
+    "";
 const size_t mbedtls_test_cas_pem_len = sizeof( mbedtls_test_cas_pem );
 #endif
 
 /* List of all available CA certificates */
 const char * mbedtls_test_cas[] = {
-#if defined(MBEDTLS_RSA_C)
-    mbedtls_test_ca_crt_rsa,
+#if defined(TEST_CA_CRT_RSA_SHA1)
+    mbedtls_test_ca_crt_rsa_sha1,
+#endif
+#if defined(TEST_CA_CRT_RSA_SHA256)
+    mbedtls_test_ca_crt_rsa_sha256,
 #endif
 #if defined(MBEDTLS_ECDSA_C)
     mbedtls_test_ca_crt_ec,
@@ -307,8 +341,11 @@
     NULL
 };
 const size_t mbedtls_test_cas_len[] = {
-#if defined(MBEDTLS_RSA_C)
-    sizeof( mbedtls_test_ca_crt_rsa ),
+#if defined(TEST_CA_CRT_RSA_SHA1)
+    sizeof( mbedtls_test_ca_crt_rsa_sha1 ),
+#endif
+#if defined(TEST_CA_CRT_RSA_SHA256)
+    sizeof( mbedtls_test_ca_crt_rsa_sha256 ),
 #endif
 #if defined(MBEDTLS_ECDSA_C)
     sizeof( mbedtls_test_ca_crt_ec ),
@@ -317,19 +354,19 @@
 };
 
 #if defined(MBEDTLS_RSA_C)
-const char *mbedtls_test_ca_crt  = mbedtls_test_ca_crt_rsa;
+const char *mbedtls_test_ca_crt  = mbedtls_test_ca_crt_rsa_sha256;
 const char *mbedtls_test_ca_key  = mbedtls_test_ca_key_rsa;
 const char *mbedtls_test_ca_pwd  = mbedtls_test_ca_pwd_rsa;
 const char *mbedtls_test_srv_crt = mbedtls_test_srv_crt_rsa;
 const char *mbedtls_test_srv_key = mbedtls_test_srv_key_rsa;
-const char *mbedtls_test_cli_crt = mbedtls_test_cli_crt_rsa;
+const char *mbedtls_test_cli_crt = mbedtls_test_cli_crt_rsa_sha256;
 const char *mbedtls_test_cli_key = mbedtls_test_cli_key_rsa;
-const size_t mbedtls_test_ca_crt_len  = sizeof( mbedtls_test_ca_crt_rsa );
+const size_t mbedtls_test_ca_crt_len  = sizeof( mbedtls_test_ca_crt_rsa_sha256 );
 const size_t mbedtls_test_ca_key_len  = sizeof( mbedtls_test_ca_key_rsa );
 const size_t mbedtls_test_ca_pwd_len  = sizeof( mbedtls_test_ca_pwd_rsa ) - 1;
 const size_t mbedtls_test_srv_crt_len = sizeof( mbedtls_test_srv_crt_rsa );
 const size_t mbedtls_test_srv_key_len = sizeof( mbedtls_test_srv_key_rsa );
-const size_t mbedtls_test_cli_crt_len = sizeof( mbedtls_test_cli_crt_rsa );
+const size_t mbedtls_test_cli_crt_len = sizeof( mbedtls_test_cli_crt_rsa_sha256 );
 const size_t mbedtls_test_cli_key_len = sizeof( mbedtls_test_cli_key_rsa );
 #else /* ! MBEDTLS_RSA_C, so MBEDTLS_ECDSA_C */
 const char *mbedtls_test_ca_crt  = mbedtls_test_ca_crt_ec;