Working example of AES_ige_encrypt usage

AES_ige_encrypt.c

#include <assert.h>
#include <openssl/aes.h>
#include <openssl/ssl.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>

/**
 * Interestingly enough, using `iv` and `userKey` directly will
 * result in corrupted encrypted data, so we need to copy iv and userKey to temporary
 * userKey2 and iv2 for it to work.
 */
int main(){
    char iv[32];
    uint8_t userKey[32];

    uint8_t userKey2[32];
    uint8_t iv2[32];

    memset(iv,0,32);
    memset(userKey,0,32);

    uint32_t data_len = 64;

    unsigned char data[data_len];
    memset(data,0,data_len);

    AES_KEY aes_key;
    unsigned char encrypted[data_len];
    uint32_t i;

    printf("encrypted buffer before encryption:\n");
    for(i = 0; i < data_len;i++) {
        printf("%d ",encrypted[i]);
    }
    printf("\n\n");

    printf("user key:\n");
    for(i = 0; i < 32;i++) {
        printf("%d ",userKey[i]);
    }
    printf("\n\n");

    printf("iv:\n");
    for(i = 0; i < AES_BLOCK_SIZE*2;i++) {
        printf("%d ",iv[i]);
    }
    printf("\n\n");

    memcpy(userKey2,userKey,32);
    memcpy(iv2,iv,32);

    assert(AES_set_encrypt_key(userKey2,256,&aes_key) == 0);
    AES_ige_encrypt(data,encrypted,data_len,&aes_key,iv2,AES_ENCRYPT);

    printf("encrypted:\n");
    for(i = 0; i < data_len;i++) {
        printf("%d ",encrypted[i]);
    }
    printf("\n\n");

    printf("decrypted buffer after encryption:\n");
    for(i = 0; i < data_len;i++) {
        printf("%d ",data[i]);
    }
    printf("\n\n");

    printf("user key after encryption:\n");
    for(i = 0; i < 32;i++) {
        printf("%d ",userKey[i]);
    }
    printf("\n\n");

    memcpy(userKey2,userKey,32);
    memcpy(iv2,iv,32);

    unsigned char decrypted[data_len];
    AES_KEY aes_key2;
    assert(AES_set_decrypt_key(userKey,256,&aes_key2) == 0);
    AES_ige_encrypt(encrypted,decrypted,data_len,&aes_key2,iv2,AES_DECRYPT);

    printf("decrypted:\n");
    for(i = 0; i < data_len;i++) {
        printf("%d ",decrypted[i]);
    }
    printf("\n");

    uint8_t expected_decrypted[data_len];
    memset(expected_decrypted,0,data_len);

    assert(memcmp(decrypted,expected_decrypted,data_len)==0);
}