AES

[mohamed salah bouassida]

i'm testing the AES algorithm

i have problems with the decryption function, it doesn't return the correct plaintext

Following is the source code of my test : 

If anybody can help me,

Thank you

#include <stdio.h>
#include <openssl/aes.h>

int main(void) {
         unsigned char key[] = {
                   0x06, 0xa9, 0x21, 0x40, 0x36, 0xb8, 0xa1, 0x5b,
                     0x51, 0x2e, 0x03, 0xd5, 0x34, 0x12, 0x00, 0x06
                              };

          unsigned char iv[] = {
                    0x3d, 0xaf, 0xba, 0x42, 0x9d, 0x9e, 0xb4, 0x30,
                      0xb4, 0x22, 0xda, 0x80, 0x2c, 0x9f, 0xac, 0x41
                               };

           unsigned char plaintext[] ={
                                 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
                                 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
                                };

            unsigned char ciphertext[] ={
                      0xe3, 0x53, 0x77, 0x9c, 0x10, 0x79, 0xae, 0xb8,
                        0x27, 0x08, 0x94, 0x2d, 0xbe, 0x77, 0x18, 0x1a
                                 };

             AES_KEY cypher_key;int i;
              unsigned char temp[16];
              unsigned char temp2[16];

               AES_set_encrypt_key(key, 128, &cypher_key);
               AES_cbc_encrypt(plaintext, temp, 16, &cypher_key, iv,
                                AES_ENCRYPT);

                memset(&cypher_key, 0, sizeof(cypher_key));
                memset(temp2,0,sizeof(temp2));
                AES_set_decrypt_key(key, 128, &cypher_key);
                AES_cbc_encrypt(temp, temp2, 16, &cypher_key, iv,
                                    AES_DECRYPT);

                if(memcmp(temp2,plaintext, sizeof(plaintext)))
                       printf("BAD DECRYPTION \n");
                else
                        printf("DECRYPTION OK\n");

                return 0;
}

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