AES_unwrap_key returns 0

[InMotion Man <inmotiont@xxxxxxxxx>]

Hello all,

I'm having trouble using the AES_unwrap_key function. I have tried different things but it always returns 0 and the out buffer does not get written to. 

I can wrap a key with the AES_wrap_key. Then I pass the wrapped key output to AES_unwrap_key and it is not able to unwrap it. This is regardless if I use the default IV (passing NULL to the function) or pass an explicit IV.See sample code below. 

Has anybody seen this issue? Any help will be appreciated.

I'm using OpenSSL 1.1.0.f

#include <aes.h>

int

main(int argc, char **argv)

{

    int i;

    int ret;

    unsigned char wrappedKeyData[24];

    unsigned char KEK[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F};

    unsigned char keyData[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF};

    unsigned char IV[8] = {0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6};

  

    AES_KEY wrp_key;

    AES_set_encrypt_key(KEK, 128, &wrp_key);

    /* wrapping  */

    ret = AES_wrap_key(&wrp_key, NULL, wrappedKeyData, keyData, 16);

    printf("openssl wrapping returns %i\n", ret);

    printf("wrapped keyData: ");

    for (i = 0; i < ret; i++) {

        printf ("%02x", wrappedKeyData[i]);

    }

    printf("\n");

    /* unwrapping */

    unsigned char keyDataOut[16];

    ret = AES_unwrap_key(&wrp_key, NULL, keyDataOut, wrappedKeyData, 24);

    printf("unwrapping openssl returns %i\n", ret);

    printf("unwrapped keyData: ");

    for (i = 0; i < 16; i++) {

        printf ("%02x", keyDataOut[i]) ;

    }

    printf("\n");

    return EXIT_SUCCESS;

}

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