TestSpeck.ino fails on samd21 M0 after changing the plaintext

[Maximize0987]

I modified the code to drop all specksmall and tiny, and it still passes works properly, I then change the plaintext so that it matches the first bytes I want to send over a rmf95. It then fails I modified the code to show the encrypted array, and the decrypted array. I assume the encrypted array is correct, but the decrypted array matches the original plaintext! Where is it getting the old array from? I then wrote this sketch to a different samd21 that never had the original plaintext and it still serial prints the old array I don't know where its getting it from. following is the original struct, then my modified TestSpeck.ino and the serial output. Thanks for your help.

THE ORIGINAL UNMODIFIED PARTS.........................................................................................

// Define the test vectors from http://eprint.iacr.org/2013/404
static TestVector const testVectorSpeck128 = {
.name = "Speck-128-ECB",
.key = {0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00},
.plaintext = {0x6c, 0x61, 0x76, 0x69, 0x75, 0x71, 0x65, 0x20,
0x74, 0x69, 0x20, 0x65, 0x64, 0x61, 0x6d, 0x20},
.ciphertext = {0xa6, 0x5d, 0x98, 0x51, 0x79, 0x78, 0x32, 0x65,
0x78, 0x60, 0xfe, 0xdf, 0x5c, 0x57, 0x0d, 0x18}
};

MY MODIFIED TESTSPECK.INO......................................................................................................

/*

• Copyright (C) 2015 Southern Storm Software, Pty Ltd.
• Permission is hereby granted, free of charge, to any person obtaining a
• copy of this software and associated documentation files (the "Software"),
• to deal in the Software without restriction, including without limitation
• the rights to use, copy, modify, merge, publish, distribute, sublicense,
• and/or sell copies of the Software, and to permit persons to whom the
• Software is furnished to do so, subject to the following conditions:
• The above copyright notice and this permission notice shall be included
• in all copies or substantial portions of the Software.
• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
• OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
• FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
• AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
• LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
• FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
• DEALINGS IN THE SOFTWARE.
  */

/*
This example runs tests on the Speck implementation to verify correct behaviour.
*/

#include <Crypto.h>
#include <Speck.h>
#include <string.h>

struct TestVector
{
const char *name;
byte key[16];
byte plaintext[16];
byte ciphertext[16];
};

// Define the test vectors from http://eprint.iacr.org/2013/404
static TestVector const testVectorSpeck128 = {
.name = "Speck-128-ECB",
.key = {0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00},
.plaintext = {0x0B, 0x89, 0xA4, 0xC2, 0x6B, 0xC9, 0xA0, 0x6C,
0x1A, 0xD4, 0xC0, 0xB5, 0xFC, 0x6E, 0x83, 0xD2},
.ciphertext = {0xa6, 0x5d, 0x98, 0x51, 0x79, 0x78, 0x32, 0x65,
0x78, 0x60, 0xfe, 0xdf, 0x5c, 0x57, 0x0d, 0x18}
};

Speck speck;

byte buffer[16];

void testCipher(BlockCipher *cipher, const struct TestVector *test, size_t keySize, bool decryption = true)
{
crypto_feed_watchdog();

Serial.print(test->name);
Serial.print(" Encryption ... ");
cipher->setKey(test->key, keySize);
cipher->encryptBlock(buffer, test->plaintext);

for(byte b=0; b<16; b++) {
  Serial.print(buffer[b], HEX);
}

Serial.print("  ");

if (memcmp(buffer, test->ciphertext, 16) == 0)
    Serial.println("Passed");
else
    Serial.println("Failed");

//if (!decryption)
//    return;

Serial.print(test->name);
Serial.print(" Decryption ... ");
cipher->decryptBlock(buffer, test->ciphertext);

for(byte b=0; b<16; b++) {
  Serial.print(buffer[b], HEX);
}

Serial.print("  ");

if (memcmp(buffer, test->plaintext, 16) == 0)
    Serial.println("Passed");
else
    Serial.println("Failed");

}

void perfCipher(BlockCipher *cipher, const struct TestVector *test, size_t keySize, bool decryption = true)
{
unsigned long start;
unsigned long elapsed;
int count;

crypto_feed_watchdog();

Serial.print(test->name);
Serial.print(" Set Key ... ");
start = micros();
for (count = 0; count < 10000; ++count) {
    cipher->setKey(test->key, keySize);
}
elapsed = micros() - start;
Serial.print(elapsed / 10000.0);
Serial.print("us per operation, ");
Serial.print((10000.0 * 1000000.0) / elapsed);
Serial.println(" per second");

Serial.print(test->name);
Serial.print(" Encrypt ... ");
start = micros();
for (count = 0; count < 5000; ++count) {
    cipher->encryptBlock(buffer, buffer);
}
elapsed = micros() - start;
Serial.print(elapsed / (5000.0 * 16.0));
Serial.print("us per byte, ");
Serial.print((16.0 * 5000.0 * 1000000.0) / elapsed);
Serial.println(" bytes per second");

// if (!decryption) {
// Serial.println();
// return;
// }

Serial.print(test->name);
Serial.print(" Decrypt ... ");
start = micros();
for (count = 0; count < 5000; ++count) {
    cipher->decryptBlock(buffer, buffer);
}
elapsed = micros() - start;
Serial.print(elapsed / (5000.0 * 16.0));
Serial.print("us per byte, ");
Serial.print((16.0 * 5000.0 * 1000000.0) / elapsed);
Serial.println(" bytes per second");

Serial.println();

}

void setup()
{
Serial.begin(115200);

Serial.println();

}

void loop()
{
Serial.println("State Sizes:");
Serial.print("Speck ... ");
Serial.println(sizeof(Speck));

Serial.println("Speck Test Vectors:");

testCipher(&speck, &testVectorSpeck128, 16);

Serial.println();

Serial.println("Speck Performance Tests:");

perfCipher(&speck, &testVectorSpeck128, 16);

Serial.println();

delay(2000);

}

THIS IS THE END OF THE SKETCH.................................................................................................................................

State Sizes:
Speck ... 288
Speck Test Vectors:
Speck-128-ECB Encryption ... 68DC68CAE751527E564EB93FBD776A Failed
Speck-128-ECB Decryption ... 6C617669757165207469206564616D20 Failed

Speck Performance Tests:
Speck-128-ECB Set Key ... 89.00us per operation, 11235.90 per second
Speck-128-ECB Encrypt ... 2.88us per byte, 346724.11 bytes per second
Speck-128-ECB Decrypt ... 3.29us per byte, 303831.31 bytes per second

[Maximize0987]

I dont know how to show code properly or why it shows only sections as code. Sorry