Problema con cifrado aes 128

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void ExpandirClave( unsigned char Clave[4][4], unsigned char ClaveExpandida[4][44] );
void Encriptar( unsigned char Texto[4][4] , unsigned char Claves[4][44] );

// Pasos para encriptar 

void MixColums( unsigned char Texto[4][4] );
void SubBytes( unsigned char Texto[4][4] );
void ShiftRows( unsigned char Texto[4][4] );
void AddRoundKey( unsigned char Clave[4][4], unsigned char Texto[4][4] );

int S_Box( int Post ); // S_BOX No se que wea es pero se tiene que usar 
int RCON[11] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c};

int main(){

	printf("\n\t\t\t\t\t\t Cifrado AES " );
	printf("\n\t\t\t\t\t\tBy: Frijolito" );
	printf("\n");

	// Se usa el unsigned para que tome valores de [0 - 255]

	unsigned char Texto[16] = {'A','r','e','_','Y','o','u','_','a','_','1','_','o','r','_','0'};
	unsigned char Matriz_Texto[4][4];
	unsigned char Clave[16] = {'I','m','T','h','e','O','n','e','W','h','o','K','n','o','c','k'};
	unsigned char Matriz_Clave[4][4]; 

	unsigned char SubsClaves[4][44]; // Se almacenan todas las subclaves aca

	printf("\n\t  [>>] Texto: ");
	for( int i=0 ; i<16 ; i++ ){
		printf("0x%2x ", Texto[i] );
	}

	printf("\n\t  [>>] Clave: ");
	for( int i=0 ; i<16 ; i++ ){
		printf("0x%2x ", Clave[i] );
	}
	printf("\n");

	for( int i=0 ; i<4 ; i++ ){		// Se pasa el texto a una matriz
		for( int j=0 ; j<4 ; j++ ){
			Matriz_Texto[j][i] = Texto[i*4 +j];
		}
	}

	for( int i=0 ; i<4 ; i++ ){		// Se pasa la clave a una matriz
		for( int j=0 ; j<4 ; j++ ){
			Matriz_Clave[j][i] = Clave[i*4 +j];
		}
	}

	ExpandirClave( Matriz_Clave, SubsClaves );
	Encriptar( Matriz_Texto, SubsClaves );

	printf("\t  [>>] Texto cifrado hex: ");
	for( int i=0 ; i<4 ; i++ ){	
		for( int j=0 ; j<4 ; j++ ){
			printf("0x%2x ", Matriz_Texto[i][j] );
		}
	}
	printf("\n\t  [>>] Texto cifrado dec: ");
	for( int i=0 ; i<4 ; i++ ){	
		for( int j=0 ; j<4 ; j++ ){
			printf("%c ", Matriz_Texto[i][j] );
		}
	}

	printf("\n");

	return 0;
}

void ExpandirClave( unsigned char Clave[4][4], unsigned char ClaveExpandida[4][44] ){

	printf("\n\t  [!!] Generando SubsClaves.");

	unsigned char CopiaColumna[4]; 
	char Aux;

	for( int i=0 ; i<4 ; i++ ){
		for( int j=0 ; j<4 ; j++ ){
			ClaveExpandida[i][j] = Clave[i][j];
		}
	}

	for( int i=4 ; i<44 ; i++ ){
		for( int j=0 ; j<4 ; j++ ){
			CopiaColumna[j] = Clave[j][i-1]; 
		}

		if( i%4 == 0 ){

			Aux = CopiaColumna[0];  // Se aplica RotWord de 1 byte   
			CopiaColumna[0] = CopiaColumna[1];
			CopiaColumna[1] = CopiaColumna[2];
			CopiaColumna[2] = CopiaColumna[3];
			CopiaColumna[3] = Aux;

			for( int j=0 ; j<4 ; j++ ){
				CopiaColumna[j] = S_Box(CopiaColumna[j]);
			}

			CopiaColumna[0] = CopiaColumna[0] ^ RCON[i/4];
		}

		for( int j=0 ; j<4 ; j++ ){
			ClaveExpandida[j][i] = ClaveExpandida[j][i-4] ^ CopiaColumna[j];
		}
	}
	printf("\n\t  [!!] SubsClaves generadas.\n");
}

void Encriptar( unsigned char Texto[4][4], unsigned char Claves[4][44] ){

	printf("\n\t  [!!] Encriptando.\n");

	unsigned char SubsClaves[4][4];
	int x = 4;

// Ronda Inicial

	printf("\n\t     [>>] Ronda inicial ");

	for( int i=0 ; i<4 ; i++ ){
		for( int j=0 ; j<4 ; j++ ){
			SubsClaves[i][j] = Claves[i][j];
		}
	}
	AddRoundKey( SubsClaves, Texto );
	printf("Lista.");

// Ronda Media 

	printf("\n\t     [>>] Ronda media ");
	for( int i=0 ; i<=9 ; i++ ){
		SubBytes( Texto );
		ShiftRows( Texto );
		MixColums( Texto );
		for( int j=0 ; j<4 ; j++ ){
			for( int h=x ; h<x+4 ; h++ ){
				SubsClaves[j][h-x] = Claves[j][h];
			}
		}
		x = x + 4;
		AddRoundKey( SubsClaves, Texto );
	}
	printf("Listo.");

// Ronda Final 

	printf("\n\t     [>>] Ronda final ");
	SubBytes( Texto );
	ShiftRows( Texto );
	for( int i=0 ; i<4 ; i++ ){
		for( int j=40 ; j<44 ; j++ ){
			SubsClaves[i][j-40] = Claves[i][j]; 
		}
	}
	AddRoundKey( SubsClaves, Texto );
	printf("Listo.\n\n");

}

void AddRoundKey( unsigned char Clave[4][4], unsigned char Texto[4][4] ){
	for( int i=0 ; i<4 ; i++ ){
		for( int j=0 ; j<4 ; j++ ){
			Texto[i][j] = Texto[i][j] ^ Clave[i][j];
		}
	}
}

void SubBytes( unsigned char Texto[4][4] ){
	for( int i=0 ; i<4 ; i++ ){
		for( int j=0 ; j<4 ; j++ ){
			Texto[i][j] = S_Box( Texto[i][j] );
		}
	}
}

void ShiftRows( unsigned char Texto[4][4] ){
	unsigned char ClaveAux;
	int k = 1;
	for( int i=1 ; i<4 ; i++ ){
		for( int h=0 ; h<k ; h++){
			ClaveAux = Texto[i][0];
			for( int j=0 ; j<4 ; j++ ){
				Texto[i][j] = Texto[i][j+1];
			}
			Texto[i][3] = ClaveAux;
		}
		k = k + 1;
	}
}

void MixColums( unsigned char r[4][4] ){

	unsigned char a[4];
    unsigned char b[4];
    unsigned char h;

    /* The array 'a' is simply a copy of the input array 'r'
     * The array 'b' is each element of the array 'a' multiplied by 2
     * in Rijndael's Galois field
     * a[n] ^ b[n] is element n multiplied by 3 in Rijndael's Galois field */ 

    for ( int i=0 ; i<4 ; i++ ) {
    	for( int j=0 ; j<4 ; j++ ){
        	a[i] = r[j][i];
        	// h is 0xff if the high bit of r[c] is set, 0 otherwise
        	h = (unsigned char)((signed char)r[j][i] >> 7); // arithmetic right shift, thus shifting in either zeros or ones
        	b[i] = r[j][i] << 1;						    // implicitly removes high bit because b[c] is an 8-bit char, so we xor by 0x1b and not 0x11b in the next line
        	b[i] ^= 0x1B & h;								// Rijndael's Galois field 
    	}

    r[0][i] = b[0] ^ a[3] ^ a[2] ^ b[1] ^ a[1]; /* 2 * a0 + a3 + a2 + 3 * a1 */
    r[1][i] = b[1] ^ a[0] ^ a[3] ^ b[2] ^ a[2]; /* 2 * a1 + a0 + a3 + 3 * a2 */
    r[2][i] = b[2] ^ a[1] ^ a[0] ^ b[3] ^ a[3]; /* 2 * a2 + a1 + a0 + 3 * a3 */
    r[3][i] = b[3] ^ a[2] ^ a[1] ^ b[0] ^ a[0]; /* 2 * a3 + a2 + a1 + 3 * a0 */

    }
} 

int S_Box( int Post ){ // S_BOX No se que wea es pero se tiene que usar

	int s_box[256] = {
		0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 
		0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 
		0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 
		0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 
		0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 
		0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 
		0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 
		0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 
		0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 
		0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 
		0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 
		0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 
		0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 
		0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 
		0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 
		0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }; 

	return s_box[Post];
}