/* mbedTLS RSA functionality tests

   Focus on testing functionality where we use ESP32 hardware
   accelerated crypto features.

*/
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <esp_system.h>
#include "mbedtls/rsa.h"
#include "mbedtls/pk.h"
#include "mbedtls/x509_crt.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "unity.h"
#include "sdkconfig.h"

/* Taken from openssl s_client -connect api.gigafive.com:443 -showcerts
 */
static const char *rsa4096_cert = "-----BEGIN CERTIFICATE-----\n"\
    "MIIExzCCA6+gAwIBAgIBAzANBgkqhkiG9w0BAQsFADCBkjELMAkGA1UEBhMCVVMx\n"\
    "CzAJBgNVBAgMAkNBMRQwEgYDVQQHDAtTYW50YSBDbGFyYTElMCMGA1UECgwcR2ln\n"\
    "YWZpdmUgVGVjaG5vbG9neSBQYXJ0bmVyczEZMBcGA1UEAwwQR2lnYWZpdmUgUm9v\n"\
    "dCBDQTEeMBwGCSqGSIb3DQEJARYPY2FAZ2lnYWZpdmUuY29tMB4XDTE2MDgyNzE2\n"\
    "NDYyM1oXDTI2MDgyNTE2NDYyM1owgZcxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJD\n"\
    "QTEUMBIGA1UEBwwLU2FudGEgQ2xhcmExKTAnBgNVBAoMIEdpZ2FmaXZlIFRlY2hu\n"\
    "b2xvZ3kgUGFydG5lcnMgTExDMRkwFwYDVQQDDBBhcGkuZ2lnYWZpdmUuY29tMR8w\n"\
    "HQYJKoZIhvcNAQkBFhBjcmxAZ2lnYWZpdmUuY29tMIICIjANBgkqhkiG9w0BAQEF\n"\
    "AAOCAg8AMIICCgKCAgEAof82VrEpXMpsI/ddW6RLeTeSYtxiXZZkRbDKN6otYgEk\n"\
    "vA8yRbzei2cO2A/8+Erhe9beYLAMXWF+bjoUAFwnuIcbmufgHprOYzX/7CYXCsrH\n"\
    "LrJfVF6kvjCXy2W3xSvgh8ZgHNWnBGzl13tq19Fz8x0AhK5GQ9608oJCbnQjpVSI\n"\
    "lZDl3JVOifCeXf2c7nMhVOC/reTeto0Gbchs8Ox50WyojmfYbVjOQcA7f8p1eI+D\n"\
    "XUJK01cUGVu6/KarVArGHh5LsiyXOadbyeyOXPmjyrgarG3IIBeQSNECfJZPc/OW\n"\
    "lFszjU4YLDckI4x+tReiuFQbQPN5sDplcEldmZZm/8XD36ddvAaDds+SYlPXxDK7\n"\
    "7L8RBVUG2Ylc9YZf7RE6IMDmdQmsCZDX0VxySYEmzv5lnAx4mzzaXcgS+kHMOLyK\n"\
    "n9UxmpzwQoqqC9tMZqwRaeKW1njR1dSwQLqirBPfGCWKkpkpm7C3HEfeeLrasral\n"\
    "aPf6LAwN3A4ZKHa5Jmne7W+1eYS1aTXOAOLIPcXRAh1B80H+SusIdM9d6vk2YTIg\n"\
    "khwGQV3sgM6nIO5+T/8z141UEjWbtP7pb/u0+G9Cg7TwvRoO2UukxdvOwNto1G2e\n"\
    "J3rKB/JSYsYWnPHvvh9XR+55PZ4iCf9Rqw/IP82uyGipR9gxlHqN8WhMTj9tNEkC\n"\
    "AwEAAaMhMB8wHQYDVR0OBBYEFISCemcSriz1HFhRXluw9H+Bv9lEMA0GCSqGSIb3\n"\
    "DQEBCwUAA4IBAQCMetK0xe6Y/uZpb1ARh+hHYcHI3xI+IG4opWJeoB1gDh/xpNAW\n"\
    "j6t5MGbLoqNMBXbqL26hnKVspyvCxw7ebI5ZJgjtbrD1t+0D8yrgIZzr7AWGA9Hj\n"\
    "WIHqDHGDxwkmfjVVPmuO3l5RtJmL6KV6kVL2bOvVI6gECpFLddmOTtg+iXDfSw3x\n"\
    "0+ueMYKr8QLF+TCxfzQTHvTHvOJtcZHecc1n7PYbRmI2p7tV6RoBpV69oM6NAVUV\n"\
    "i2QoSxm0pYzDzavOaxwhEPHT34Tpg6fwXy1QokFD9OtxRFtdpTjL3bMWpatZE+ba\n"\
    "cjvvf0utMW5fNjTTxu1nnpuxZM3ifTCqZJ+9\n"\
    "-----END CERTIFICATE-----\n";

/* Root cert from openssl s_client -connect google.com:443 -showcerts
 */
static const char *rsa2048_cert = "-----BEGIN CERTIFICATE-----\n"\
    "MIIDfTCCAuagAwIBAgIDErvmMA0GCSqGSIb3DQEBBQUAME4xCzAJBgNVBAYTAlVT\n"\
    "MRAwDgYDVQQKEwdFcXVpZmF4MS0wKwYDVQQLEyRFcXVpZmF4IFNlY3VyZSBDZXJ0\n"\
    "aWZpY2F0ZSBBdXRob3JpdHkwHhcNMDIwNTIxMDQwMDAwWhcNMTgwODIxMDQwMDAw\n"\
    "WjBCMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNR2VvVHJ1c3QgSW5jLjEbMBkGA1UE\n"\
    "AxMSR2VvVHJ1c3QgR2xvYmFsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB\n"\
    "CgKCAQEA2swYYzD99BcjGlZ+W988bDjkcbd4kdS8odhM+KhDtgPpTSEHCIjaWC9m\n"\
    "OSm9BXiLnTjoBbdqfnGk5sRgprDvgOSJKA+eJdbtg/OtppHHmMlCGDUUna2YRpIu\n"\
    "T8rxh0PBFpVXLVDviS2Aelet8u5fa9IAjbkU+BQVNdnARqN7csiRv8lVK83Qlz6c\n"\
    "JmTM386DGXHKTubU1XupGc1V3sjs0l44U+VcT4wt/lAjNvxm5suOpDkZALeVAjmR\n"\
    "Cw7+OC7RHQWa9k0+bw8HHa8sHo9gOeL6NlMTOdReJivbPagUvTLrGAMoUgRx5asz\n"\
    "PeE4uwc2hGKceeoWMPRfwCvocWvk+QIDAQABo4HwMIHtMB8GA1UdIwQYMBaAFEjm\n"\
    "aPkr0rKV10fYIyAQTzOYkJ/UMB0GA1UdDgQWBBTAephojYn7qwVkDBF9qn1luMrM\n"\
    "TjAPBgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQEAwIBBjA6BgNVHR8EMzAxMC+g\n"\
    "LaArhilodHRwOi8vY3JsLmdlb3RydXN0LmNvbS9jcmxzL3NlY3VyZWNhLmNybDBO\n"\
    "BgNVHSAERzBFMEMGBFUdIAAwOzA5BggrBgEFBQcCARYtaHR0cHM6Ly93d3cuZ2Vv\n"\
    "dHJ1c3QuY29tL3Jlc291cmNlcy9yZXBvc2l0b3J5MA0GCSqGSIb3DQEBBQUAA4GB\n"\
    "AHbhEm5OSxYShjAGsoEIz/AIx8dxfmbuwu3UOx//8PDITtZDOLC5MH0Y0FWDomrL\n"\
    "NhGc6Ehmo21/uBPUR/6LWlxz/K7ZGzIZOKuXNBSqltLroxwUCEm2u+WR74M26x1W\n"\
    "b8ravHNjkOR/ez4iyz0H7V84dJzjA1BOoa+Y7mHyhD8S\n"\
    "-----END CERTIFICATE-----\n";

/* Some random input bytes to public key encrypt */
static const uint8_t pki_input[4096/8] = {
    0, 1, 4, 6, 7, 9, 33, 103, 49, 11, 56, 211, 67, 92 };

/* Result of an RSA4096 operation using cert's public key
   (raw PKI, no padding/etc) */
static const uint8_t pki_rsa4096_output[] = {
    0x91, 0x87, 0xcd, 0x04, 0x80, 0x7c, 0x8b, 0x0b,
    0x0c, 0xc0, 0x38, 0x37, 0x7a, 0xe3, 0x2c, 0x94,
    0xea, 0xc4, 0xcb, 0x83, 0x2c, 0x77, 0x71, 0x14,
    0x11, 0x85, 0x16, 0x61, 0xd3, 0x64, 0x2a, 0x0f,
    0xf9, 0x6b, 0x45, 0x04, 0x66, 0x5d, 0x15, 0xf1,
    0xcf, 0x69, 0x77, 0x90, 0xb9, 0x41, 0x68, 0xa9,
    0xa6, 0xfd, 0x94, 0xdc, 0x6a, 0xce, 0xc7, 0xb6,
    0x41, 0xd9, 0x44, 0x3c, 0x02, 0xb6, 0xc7, 0x26,
    0xce, 0xec, 0x66, 0x21, 0xa8, 0xe8, 0xf4, 0xa9,
    0x33, 0x4a, 0x6c, 0x28, 0x0f, 0x50, 0x30, 0x32,
    0x28, 0x00, 0xbb, 0x2c, 0xc3, 0x44, 0x72, 0x31,
    0x93, 0xd4, 0xde, 0x29, 0x6b, 0xfa, 0x31, 0xfd,
    0x3a, 0x05, 0xc6, 0xb1, 0x28, 0x43, 0x57, 0x20,
    0xf7, 0xf8, 0x13, 0x0c, 0x4a, 0x80, 0x00, 0xab,
    0x1f, 0xe8, 0x88, 0xad, 0x56, 0xf2, 0xda, 0x5a,
    0x50, 0xe9, 0x02, 0x09, 0x21, 0x2a, 0xfc, 0x82,
    0x68, 0x34, 0xf9, 0x04, 0xa3, 0x25, 0xe1, 0x0f,
    0xa8, 0x77, 0x29, 0x94, 0xb6, 0x9d, 0x5a, 0x08,
    0x33, 0x8d, 0x27, 0x6a, 0xc0, 0x3b, 0xad, 0x91,
    0x8a, 0x83, 0xa9, 0x2e, 0x48, 0xcd, 0x67, 0xa3,
    0x3a, 0x35, 0x41, 0x85, 0xfa, 0x3f, 0x61, 0x1f,
    0x80, 0xeb, 0xcd, 0x5a, 0xc5, 0x14, 0x7b, 0xab,
    0x9c, 0x45, 0x11, 0xd2, 0x25, 0x9a, 0x16, 0xeb,
    0x9c, 0xfa, 0xbe, 0x73, 0x18, 0xbd, 0x25, 0x8e,
    0x99, 0x6d, 0xb3, 0xbc, 0xac, 0x2d, 0xa2, 0x53,
    0xe8, 0x7c, 0x38, 0x1b, 0x7a, 0x75, 0xff, 0x76,
    0x4f, 0x48, 0x5b, 0x39, 0x20, 0x5a, 0x7b, 0x82,
    0xd3, 0x33, 0x33, 0x2a, 0xab, 0x6a, 0x7a, 0x42,
    0x1d, 0x1f, 0xd1, 0x61, 0x58, 0xd7, 0x38, 0x52,
    0xdf, 0xb0, 0x61, 0x98, 0x63, 0xb7, 0xa1, 0x4e,
    0xdb, 0x9b, 0xcb, 0xb7, 0x85, 0xc4, 0x3e, 0x03,
    0xe5, 0x59, 0x50, 0x28, 0x5a, 0x4d, 0x7f, 0x53,
    0x2e, 0x99, 0x1d, 0x6d, 0x85, 0x27, 0x78, 0x34,
    0x5e, 0xae, 0xc9, 0x1b, 0x37, 0x96, 0xde, 0x40,
    0x87, 0x35, 0x3c, 0x1f, 0xe0, 0x8f, 0xfb, 0x3a,
    0x58, 0x0e, 0x60, 0xe9, 0x06, 0xbd, 0x83, 0x03,
    0x92, 0xde, 0x5e, 0x69, 0x28, 0xb1, 0x00, 0xeb,
    0x44, 0xca, 0x3c, 0x49, 0x03, 0x10, 0xa8, 0x84,
    0xa6, 0xbb, 0xd5, 0xda, 0x98, 0x8c, 0x6f, 0xa3,
    0x0f, 0x39, 0xf3, 0xa7, 0x7d, 0xd5, 0x3b, 0xe2,
    0x85, 0x12, 0xda, 0xa4, 0x4d, 0x80, 0x97, 0xcb,
    0x11, 0xe0, 0x89, 0x90, 0xff, 0x5b, 0x72, 0x19,
    0x59, 0xd1, 0x39, 0x23, 0x9f, 0xb0, 0x00, 0xe2,
    0x45, 0x72, 0xc6, 0x9a, 0xbc, 0xe1, 0xd1, 0x51,
    0x6b, 0x35, 0xd2, 0x49, 0xbf, 0xb6, 0xfe, 0xab,
    0x09, 0xf7, 0x9d, 0xa4, 0x6e, 0x69, 0xb6, 0xf9,
    0xde, 0xe3, 0x57, 0x0c, 0x1a, 0x96, 0xf1, 0xcc,
    0x1c, 0x92, 0xdb, 0x44, 0xf4, 0x45, 0xfa, 0x8f,
    0x87, 0xcf, 0xf4, 0xd2, 0xa1, 0xf8, 0x69, 0x18,
    0xcf, 0xdc, 0xa0, 0x1f, 0xb0, 0x26, 0xad, 0x81,
    0xab, 0xdf, 0x78, 0x18, 0xa2, 0x74, 0xba, 0x2f,
    0xec, 0x70, 0xa2, 0x1f, 0x56, 0xee, 0xff, 0xc9,
    0xfe, 0xb1, 0xe1, 0x9b, 0xea, 0x0e, 0x33, 0x14,
    0x5f, 0x6e, 0xca, 0xee, 0x02, 0x56, 0x5a, 0x67,
    0x42, 0x9a, 0xbf, 0x55, 0xc0, 0x0f, 0x8e, 0x01,
    0x67, 0x63, 0x6e, 0xd1, 0x57, 0xf7, 0xf1, 0xc6,
    0x92, 0x9e, 0xb5, 0x45, 0xe1, 0x50, 0x58, 0x94,
    0x20, 0x90, 0x6a, 0x29, 0x2d, 0x4b, 0xd1, 0xb5,
    0x68, 0x63, 0xb5, 0xe6, 0xd8, 0x6e, 0x84, 0x80,
    0xad, 0xe6, 0x03, 0x1e, 0x51, 0xc2, 0xa8, 0x6d,
    0x84, 0xec, 0x2d, 0x7c, 0x61, 0x02, 0xd1, 0xda,
    0xf5, 0x94, 0xfa, 0x2d, 0xa6, 0xed, 0x89, 0x6a,
    0x6a, 0xda, 0x07, 0x5d, 0x83, 0xfc, 0x43, 0x76,
    0x7c, 0xca, 0x8c, 0x00, 0xfc, 0xb9, 0x2c, 0x23,
};

static const uint8_t pki_rsa2048_output[] = {
    0x47, 0x0b, 0xe5, 0x8a, 0xcd, 0x2f, 0x78, 0x07,
    0x69, 0x69, 0x70, 0xff, 0x81, 0xdf, 0x96, 0xf0,
    0xed, 0x82, 0x3a, 0x3d, 0x46, 0xab, 0xe9, 0xc3,
    0xb5, 0xd9, 0xca, 0xa2, 0x05, 0xa9, 0xf6, 0x6e,
    0xad, 0x6c, 0xe0, 0xd1, 0xa2, 0xb4, 0xf2, 0x78,
    0x4a, 0x93, 0xfc, 0x45, 0xe1, 0x9b, 0xdd, 0x62,
    0xf9, 0x66, 0x2a, 0x14, 0x38, 0x12, 0xb6, 0x50,
    0x0b, 0xe3, 0x53, 0x9c, 0x12, 0x56, 0xf1, 0xb7,
    0x83, 0xd5, 0xf3, 0x24, 0x81, 0xcc, 0x5a, 0xeb,
    0xec, 0xac, 0x68, 0xa8, 0x0c, 0xd7, 0x84, 0x7a,
    0xbb, 0x77, 0x7b, 0xd5, 0x5b, 0xcf, 0x7b, 0x25,
    0xd0, 0x75, 0x80, 0x21, 0x12, 0x97, 0x6b, 0xe1,
    0xb6, 0x51, 0x12, 0x52, 0x6e, 0x01, 0x92, 0xb7,
    0xcc, 0x70, 0x4b, 0x46, 0x11, 0x98, 0x5a, 0x84,
    0x1c, 0x90, 0x45, 0x0f, 0x15, 0x77, 0xdb, 0x79,
    0xe8, 0xff, 0x1f, 0xaa, 0x58, 0x95, 0xce, 0x3c,
    0x65, 0x0c, 0x66, 0x29, 0xe1, 0x9c, 0x41, 0xbb,
    0xde, 0x65, 0xb8, 0x29, 0x36, 0x94, 0xbd, 0x87,
    0x93, 0x39, 0xc5, 0xeb, 0x49, 0x21, 0xc1, 0xeb,
    0x48, 0xbd, 0x19, 0x13, 0x4d, 0x40, 0x90, 0x88,
    0xc6, 0x12, 0xd9, 0xf7, 0xdd, 0xc8, 0x4f, 0x89,
    0xc0, 0x91, 0xf8, 0xeb, 0xcf, 0xe3, 0x12, 0x17,
    0x88, 0x9c, 0x88, 0xf4, 0xf5, 0xae, 0xf4, 0x15,
    0xfe, 0x17, 0xf6, 0xa4, 0x74, 0x49, 0x02, 0x05,
    0x11, 0x3b, 0x92, 0x25, 0x39, 0x2c, 0x4b, 0x08,
    0x19, 0x76, 0x13, 0x8d, 0xf9, 0xda, 0xae, 0xdf,
    0x30, 0xda, 0xcc, 0xbb, 0x3f, 0xb9, 0xb0, 0xd6,
    0x5c, 0x78, 0x4b, 0x2b, 0x35, 0x51, 0x17, 0x48,
    0xf5, 0xd4, 0x39, 0x7e, 0x05, 0x83, 0x68, 0x86,
    0x44, 0x5f, 0x56, 0x1d, 0x2c, 0x53, 0xd3, 0x64,
    0x3a, 0xb2, 0x0c, 0x4a, 0x85, 0xd6, 0x5b, 0x7e,
    0xf9, 0xe9, 0x50, 0x29, 0x5d, 0x4f, 0xcc, 0xc9,
};

_Static_assert(sizeof(pki_rsa2048_output) == 2048/8, "rsa2048 output is wrong size");
_Static_assert(sizeof(pki_rsa4096_output) == 4096/8, "rsa4096 output is wrong size");

static void test_cert(const char *cert, const uint8_t *expected_output, size_t output_len);

TEST_CASE("mbedtls RSA4096 cert", "[mbedtls]")
{

    test_cert(rsa4096_cert, pki_rsa4096_output, 4096/8);
}

TEST_CASE("mbedtls RSA2048 cert", "[mbedtls]")
{
    test_cert(rsa2048_cert, pki_rsa2048_output, 2048/8);
}

static void test_cert(const char *cert, const uint8_t *expected_output, size_t output_len)
{
    mbedtls_x509_crt crt;
    mbedtls_rsa_context *rsa;
    char buf[output_len];

    bzero(buf, output_len);

    mbedtls_x509_crt_init(&crt);

    TEST_ASSERT_EQUAL_HEX16_MESSAGE(0,
                                    -mbedtls_x509_crt_parse(&crt,
                                                            (const uint8_t *)cert,
                                                            strlen(cert)+1),
                                    "parse cert");

    rsa = mbedtls_pk_rsa(crt.pk);
    TEST_ASSERT_NOT_NULL(rsa);

    TEST_ASSERT_EQUAL_HEX16_MESSAGE(0,
                                    -mbedtls_rsa_check_pubkey(rsa),
                                    "check cert pubkey");

    mbedtls_x509_crt_info(buf, sizeof(buf), "", &crt);
    puts(buf);

    TEST_ASSERT_EQUAL_HEX16_MESSAGE(0,
                                    -mbedtls_rsa_public(rsa, pki_input, (uint8_t *)buf),
                                    "RSA PK operation");

    /*
    // Dump buffer for debugging
    for(int i = 0; i < output_len; i++) {
        printf("0x%02x, ", buf[i]);
    }
    printf("\n");
    */

    TEST_ASSERT_EQUAL_HEX8_ARRAY(expected_output, buf, output_len);

    mbedtls_x509_crt_free(&crt);
}