int
main(int argc, char **argv)
{
int rv;
const char *what;
const char *filename;
const char *outname;
TheImg4 *img4;
unsigned type;
unsigned written;
unsigned char ivkey[16 + 32];
unsigned char *iv = NULL, *key = NULL;
unsigned char *output = NULL;
unsigned outlen = 0;
int outdup = 0;
DERItem item;
unsigned char *data;
size_t size;
if (argc < 4) {
fprintf(stderr, "usage: %s {-image|-extra|-keybag|-ticket} input output [ivkey]\n", argv[0]);
return 1;
}
what = argv[1];
filename = argv[2];
outname = argv[3];
if (argc > 4) {
rv = str2hex(sizeof(ivkey), ivkey, argv[4]);
if (rv == sizeof(ivkey)) {
iv = ivkey;
key = ivkey + 16;
}
}
data = read_file(filename, 0, &size);
if (data == NULL) {
fprintf(stderr, "[e] cannot read '%s'\n", filename);
return -1;
}
img4 = parse(data, size);
if (!img4) {
fprintf(stderr, "[e] cannot parse '%s'\n", filename);
free(data);
return -1;
}
rv = Img4DecodeGetPayloadType(img4, &type);
if (rv) {
fprintf(stderr, "[e] cannot identify '%s'\n", filename);
goto err;
}
printf("%c%c%c%c\n", FOURCC(type));
if (!strncmp(what, "-i", 2) || !strncmp(what, "-e", 2)) {
int decompress;
rv = Img4DecodeGetPayload(img4, &item);
if (rv) {
fprintf(stderr, "[e] cannot extract payload from '%s'\n", filename);
goto err;
}
output = item.data;
outlen = item.length;
if (iv && key) {
if (outlen & 15) {
unsigned usize = (outlen + 15) & ~15;
unsigned char *tmp = calloc(1, usize);
if (!tmp) {
fprintf(stderr, "[e] out of memory %u\n", usize);
goto err;
}
memcpy(tmp, output, outlen);
OUTSET(tmp);
}
rv = Img4DecodeGetPayloadKeybag(img4, &item);
if (rv || item.length == 0) {
fprintf(stderr, "[w] image '%s' has no keybag\n", filename);
}
#ifdef USE_CORECRYPTO
cccbc_one_shot(ccaes_cbc_decrypt_mode(), 32, key, iv, (outlen + 15) / 16, output, output);
#else
AES_KEY decryptKey;
AES_set_decrypt_key(key, 256, &decryptKey);
AES_cbc_encrypt(output, output, (outlen + 15) & ~15, &decryptKey, iv, AES_DECRYPT);
#endif
}
#ifdef iOS10
if (img4->payload.compression.data && img4->payload.compression.length) {
DERItem tmp[2];
uint32_t deco = 0;
uint64_t usize = 0;
if (DERParseSequenceContent(&img4->payload.compression, 2, DERImg4PayloadItemSpecs10c, tmp, 0) ||
DERParseInteger(&tmp[0], &deco) || DERParseInteger64(&tmp[1], &usize)) {
fprintf(stderr, "[e] cannot get decompression info\n");
goto err;
}
if (deco == 1 && what[1] == 'i') {
size_t asize = lzfse_decode_scratch_size();
unsigned char *dec, *aux = malloc(asize);
if (!aux) {
fprintf(stderr, "[e] out of memory %zu\n", asize);
goto err;
}
dec = malloc(usize + 1);
if (!dec) {
fprintf(stderr, "[e] out of memory %llu\n", usize + 1);
free(aux);
goto err;
}
outlen = lzfse_decode_buffer(dec, usize + 1, output, outlen, aux);
free(aux);
if (outlen != usize) {
fprintf(stderr, "[e] decompression error\n");
free(dec);
goto err;
}
OUTSET(dec);
}
}
#endif
decompress = (DWORD_BE(output, 0) == 'comp' && DWORD_BE(output, 4) == 'lzss');
if (decompress && what[1] == 'i') {
uint32_t csize = DWORD_BE(output, 16);
uint32_t usize = DWORD_BE(output, 12);
uint32_t adler = DWORD_BE(output, 8);
unsigned char *dec = malloc(usize);
if (outlen > 0x180 + csize) {
fprintf(stderr, "[i] extra 0x%x bytes after compressed chunk\n", outlen - 0x180 - csize);
}
if (!dec) {
fprintf(stderr, "[e] out of memory %u\n", usize);
goto err;
}
outlen = decompress_lzss(dec, output + 0x180, csize);
if (adler != lzadler32(dec, outlen)) {
fprintf(stderr, "[w] adler32 mismatch\n");
}
OUTSET(dec);
} else if (decompress) {
uint32_t csize = DWORD_BE(output, 16);
uint32_t usize = outlen - 0x180 - csize;
if (outlen > 0x180 + csize) {
unsigned char *dec = malloc(usize);
if (!dec) {
fprintf(stderr, "[e] out of memory %u\n", usize);
goto err;
}
memcpy(dec, output + 0x180 + csize, usize);
outlen = usize;
OUTSET(dec);
} else {
OUTSET(NULL);
}
} else if (what[1] == 'e') {
OUTSET(NULL);
}
if (!output) {
fprintf(stderr, "[e] nothing to do\n");
goto err;
}
}
if (!strncmp(what, "-k", 2)) {
rv = Img4DecodeGetPayloadKeybag(img4, &item);
if (rv == 0 && item.length) {
output = item.data;
outlen = item.length;
} else {
fprintf(stderr, "[e] image '%s' has no keybag\n", filename);
goto err;
}
}
if (!strncmp(what, "-t", 2)) {
bool exists = false;
rv = Img4DecodeManifestExists(img4, &exists);
if (rv == 0 && exists) {
output = img4->manifestRaw.data;
outlen = img4->manifestRaw.length;
} else {
fprintf(stderr, "[e] image '%s' has no ticket\n", filename);
goto err;
}
}
written = write_file(outname, output, outlen);
if (written != outlen) {
fprintf(stderr, "[e] cannot write '%s'\n", outname);
goto err;
}
rv = 0;
out:
if (outdup) {
free(output);
}
free(img4);
free(data);
return rv;
err:
rv = -1;
goto out;
}
// Test the AES CBC mode
static int AES_CBC_POST()
{
size_t key128Length = 16;
size_t key192Length = 24;
size_t key256Length = 32;
typedef struct
{
size_t keyLength;
int forEncryption;
unsigned char* keyData;
unsigned char* ivData;
unsigned char* inputData;
unsigned char* outputData;
} testData;
// AES 128 Encryption Test Data
unsigned char* key128EncryptBuffer = (unsigned char*)"\x34\x49\x1b\x26\x6d\x8f\xb5\x4c\x5c\xe1\xa9\xfb\xf1\x7b\x09\x8c";
unsigned char* iv128EncryptBuffer = (unsigned char*)"\x9b\xc2\x0b\x29\x51\xff\x72\xd3\xf2\x80\xff\x3b\xd2\xdc\x3d\xcc";
unsigned char* input128EncryptBuffer = (unsigned char*)"\x06\xfe\x99\x71\x63\xcb\xcb\x55\x85\x3e\x28\x57\x74\xcc\xa8\x9d";
#ifdef FORCE_FAIL
unsigned char* output128EncryptBuffer = (unsigned char*)"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f";
#else
unsigned char* output128EncryptBuffer = (unsigned char*)"\x32\x5d\xe3\x14\xe9\x29\xed\x08\x97\x87\xd0\xa2\x05\xd1\xeb\x33";
#endif
// AES 128 Decryption Test Data
unsigned char* key128DecryptBuffer = (unsigned char*)"\xc6\x8e\x4e\xb2\xca\x2a\xc5\xaf\xee\xac\xad\xea\xa3\x97\x11\x94";
unsigned char* iv128DecryptBuffer = (unsigned char*)"\x11\xdd\x9d\xa1\xbd\x22\x3a\xcf\x68\xc5\xa1\xe1\x96\x4c\x18\x9b";
unsigned char* input128DecryptBuffer = (unsigned char*)"\xaa\x36\x57\x9b\x0c\x72\xc5\x28\x16\x7b\x70\x12\xd7\xfa\xf0\xde";
unsigned char* output128DecryptBuffer = (unsigned char*)"\x9e\x66\x1d\xb3\x80\x39\x20\x9a\x72\xc7\xd2\x96\x40\x66\x88\xf2";
// AES 192 Encryption Test Data
unsigned char* key192EncryptBuffer = (unsigned char*)"\x05\x85\xfc\xe6\xa9\x8c\x54\xd7\x2a\x4d\x7d\x53\x13\xbd\xeb\x0c\x1c\x42\xbc\xba\xf1\x68\x9b\x6b";
unsigned char* iv192EncryptBuffer = (unsigned char*)"\xf5\xc8\x5d\x21\x3c\xe2\x7e\xb2\xea\xf6\x29\x3c\xee\x44\x6f\x18";
unsigned char* input192EncryptBuffer = (unsigned char*)"\x5b\xb1\x61\xa5\x8d\xa6\x18\xfc\x55\x2d\x28\x23\x21\x4b\x8e\xee";
unsigned char* output192EncryptBuffer = (unsigned char*)"\x34\x91\xb7\xa7\x88\x67\x71\xf7\xc8\x0d\x85\x95\x4d\x6f\x7f\x28";
// AES 192 Decryption Test Data
unsigned char* key192DecryptBuffer = (unsigned char*)"\x05\x8f\x89\xc4\xc9\x09\x0c\xad\x01\xd1\xa9\x37\x7f\x3f\xea\x14\x42\x24\xea\x49\x4b\x53\xc2\xd5";
unsigned char* iv192DecryptBuffer = (unsigned char*)"\xb8\xb1\x88\x69\x88\x18\x10\xdd\x4a\xb4\xd1\x19\x55\x94\x70\xc2";
unsigned char* input192DecryptBuffer = (unsigned char*)"\x12\xb9\xd4\x81\xeb\x0c\x7b\xe3\xfd\x6a\xe7\x55\xc9\xde\x3f\x6f";
unsigned char* output192DecryptBuffer = (unsigned char*)"\x7e\xb8\x86\x01\xa8\xb4\x85\x60\x5e\xbe\x7d\x88\x95\x75\xea\x94";
// AES 256 Encryption Test Data
unsigned char* key256EncryptBuffer = (unsigned char*)"\xcd\x53\x9b\x65\x93\x19\x45\xb9\xe8\x65\xbc\x80\x4c\x4b\x16\x89\x24\x29\x8c\x3e\x02\xd9\xda\x79\x27\x2b\xe5\x99\x47\x92\xa0\xd4";
unsigned char* iv256EncryptBuffer = (unsigned char*)"\x0d\x52\xe3\x43\x57\x31\x4e\x28\x78\xa0\xca\x96\xc5\x32\xef\xd8";
unsigned char* input256EncryptBuffer = (unsigned char*)"\x17\x55\xb7\x73\x0b\x8c\x1c\x65\x0b\x42\x13\x70\x5b\x3e\x9c\xa2";
unsigned char* output256EncryptBuffer = (unsigned char*)"\x48\x8f\x47\x28\xa5\xac\xd5\x19\x84\x11\x0a\x23\x37\x49\x37\x30";
// AES 256 Decryption Test Data
unsigned char* key256DecryptBuffer = (unsigned char*)"\x10\x42\x2a\x2a\x6c\x95\x41\xf4\x25\x63\x29\x88\xcb\x91\x83\x10\xab\xc5\xab\x8d\x96\x1c\x98\x27\xe4\x20\x04\xc1\xb9\xf4\xcd\xd1";
unsigned char* iv256DecryptBuffer = (unsigned char*)"\x0b\xf1\x8e\xba\x5e\x67\x1f\x71\x3c\x06\xd7\xc3\x15\x4c\xd4\xa9";
unsigned char* input256DecryptBuffer = (unsigned char*)"\xcc\x1b\xbc\x58\x78\xef\xf3\xde\xa7\x61\xde\x94\x5e\xf2\x50\x12";
unsigned char* output256DecryptBuffer = (unsigned char*)"\x61\xb7\x6a\x6d\xce\xaf\xc6\xae\xc1\xc3\x8d\xf3\x4a\xab\x49\x97";
testData dataToTest[] =
{
{key128Length, 1, key128EncryptBuffer, iv128EncryptBuffer, input128EncryptBuffer, output128EncryptBuffer},
{key128Length, 0, key128DecryptBuffer, iv128DecryptBuffer, input128DecryptBuffer, output128DecryptBuffer},
{key192Length, 1, key192EncryptBuffer, iv192EncryptBuffer, input192EncryptBuffer, output192EncryptBuffer},
{key192Length, 0, key192DecryptBuffer, iv192DecryptBuffer, input192DecryptBuffer, output192DecryptBuffer},
{key256Length, 1, key256EncryptBuffer, iv256EncryptBuffer, input256EncryptBuffer, output256EncryptBuffer},
{key256Length, 0, key256DecryptBuffer, iv256DecryptBuffer, input256DecryptBuffer, output256DecryptBuffer}
};
const struct ccmode_cbc* mode_enc = ccaes_cbc_encrypt_mode();
const struct ccmode_cbc* mode_dec = ccaes_cbc_decrypt_mode();
struct {
const struct ccmode_cbc* enc_mode_ptr;
const struct ccmode_cbc* dec_mode_ptr;
} impl[] = {
{mode_enc, mode_dec},
};
int memCheckResult = 0;
unsigned char outputBuffer[CCAES_BLOCK_SIZE];
int numDataToTest = 6;
int numModesToTest = 1;
for (int iCnt = 0; iCnt < numDataToTest; iCnt++)
{
for(int jCnt = 0; jCnt < numModesToTest; jCnt++)
{
cccbc_one_shot((dataToTest[iCnt].forEncryption ?
impl[jCnt].enc_mode_ptr :
impl[jCnt].dec_mode_ptr),
dataToTest[iCnt].keyLength, dataToTest[iCnt].keyData,
dataToTest[iCnt].ivData,
1, /* Only 1 block */
dataToTest[iCnt].inputData, outputBuffer);
memCheckResult = (0 == memcmp(dataToTest[iCnt].outputData, outputBuffer, CCAES_BLOCK_SIZE));
if (!memCheckResult)
{
return -1;
}
}
}
return 0;
}