/**
\ingroup Core_WritePackets
\brief Write a One Pass Signature packet
\param seckey Secret Key to use
\param hash_alg Hash Algorithm to use
\param sig_type Signature type
\param output Write settings
\return 1 if OK; else 0
*/
unsigned
pgp_write_one_pass_sig(pgp_output_t *output,
const pgp_seckey_t *seckey,
const pgp_hash_alg_t hash_alg,
const pgp_sig_type_t sig_type)
{
uint8_t keyid[PGP_KEY_ID_SIZE];
pgp_keyid(keyid, PGP_KEY_ID_SIZE, &seckey->pubkey, PGP_HASH_SHA1); /* XXX - hardcoded */
return pgp_write_ptag(output, PGP_PTAG_CT_1_PASS_SIG) &&
pgp_write_length(output, 1 + 1 + 1 + 1 + 8 + 1) &&
pgp_write_scalar(output, 3, 1) /* version */ &&
pgp_write_scalar(output, (unsigned)sig_type, 1) &&
pgp_write_scalar(output, (unsigned)hash_alg, 1) &&
pgp_write_scalar(output, (unsigned)seckey->pubkey.alg, 1) &&
pgp_write(output, keyid, 8) &&
pgp_write_scalar(output, 1, 1);
}
unsigned
pgp_end_hashed_subpkts(pgp_create_sig_t *sig)
{
sig->hashlen = (unsigned)(pgp_mem_len(sig->mem) - sig->hashoff - 2);
pgp_memory_place_int(sig->mem, sig->hashoff, sig->hashlen, 2);
/* dummy unhashed subpacket count */
sig->unhashoff = (unsigned)pgp_mem_len(sig->mem);
return pgp_write_scalar(sig->output, 0, 2);
}
unsigned
pgp_write_ss_header(pgp_output_t *output,
unsigned length,
pgp_content_enum type)
{
return pgp_write_length(output, length) &&
pgp_write_scalar(output, (unsigned)(type -
(unsigned)PGP_PTAG_SIG_SUBPKT_BASE), 1);
}
static void
start_sig_in_mem(pgp_create_sig_t *sig)
{
/* since this has subpackets and stuff, we have to buffer the whole */
/* thing to get counts before writing. */
sig->mem = pgp_memory_new();
pgp_memory_init(sig->mem, 100);
pgp_writer_set_memory(sig->output, sig->mem);
/* write nearly up to the first subpacket */
pgp_write_scalar(sig->output, (unsigned)sig->sig.info.version, 1);
pgp_write_scalar(sig->output, (unsigned)sig->sig.info.type, 1);
pgp_write_scalar(sig->output, (unsigned)sig->sig.info.key_alg, 1);
pgp_write_scalar(sig->output, (unsigned)sig->sig.info.hash_alg, 1);
/* dummy hashed subpacket count */
sig->hashoff = (unsigned)pgp_mem_len(sig->mem);
pgp_write_scalar(sig->output, 0, 2);
}
/**
\ingroup Core_WritePackets
\brief Writes Literal Data packet from buffer
\param data Buffer to write out
\param maxlen Max length of buffer
\param type Literal Data Type
\param output Write settings
\return 1 if OK; else 0
*/
unsigned
pgp_write_litdata(pgp_output_t *output,
const uint8_t *data,
const int maxlen,
const pgp_litdata_enum type)
{
/*
* RFC4880 does not specify a meaning for filename or date.
* It is implementation-dependent.
* We will not implement them.
*/
/* \todo do we need to check text data for <cr><lf> line endings ? */
return pgp_write_ptag(output, PGP_PTAG_CT_LITDATA) &&
pgp_write_length(output, (unsigned)(1 + 1 + 4 + maxlen)) &&
pgp_write_scalar(output, (unsigned)type, 1) &&
pgp_write_scalar(output, 0, 1) &&
pgp_write_scalar(output, 0, 4) &&
pgp_write(output, data, (unsigned)maxlen);
}
/*
* Note that we support v3 keys here because they're needed for for
* verification - the writer doesn't allow them, though
*/
static unsigned
write_pubkey_body(const pgp_pubkey_t *key, pgp_output_t *output)
{
if (!(pgp_write_scalar(output, (unsigned)key->version, 1) &&
pgp_write_scalar(output, (unsigned)key->birthtime, 4))) {
return 0;
}
if (key->version != 4 &&
!pgp_write_scalar(output, key->days_valid, 2)) {
return 0;
}
if (!pgp_write_scalar(output, (unsigned)key->alg, 1)) {
return 0;
}
switch (key->alg) {
case PGP_PKA_DSA:
return pgp_write_mpi(output, key->key.dsa.p) &&
pgp_write_mpi(output, key->key.dsa.q) &&
pgp_write_mpi(output, key->key.dsa.g) &&
pgp_write_mpi(output, key->key.dsa.y);
case PGP_PKA_RSA:
case PGP_PKA_RSA_ENCRYPT_ONLY:
case PGP_PKA_RSA_SIGN_ONLY:
return pgp_write_mpi(output, key->key.rsa.n) &&
pgp_write_mpi(output, key->key.rsa.e);
case PGP_PKA_ELGAMAL:
return pgp_write_mpi(output, key->key.elgamal.p) &&
pgp_write_mpi(output, key->key.elgamal.g) &&
pgp_write_mpi(output, key->key.elgamal.y);
default:
(void) fprintf(stderr,
"write_pubkey_body: bad algorithm\n");
break;
}
return 0;
}
/* add a time stamp to the output */
unsigned
pgp_add_time(pgp_create_sig_t *sig, int64_t when, const char *type)
{
pgp_content_enum tag;
tag = (strcmp(type, "birth") == 0) ?
PGP_PTAG_SS_CREATION_TIME : PGP_PTAG_SS_EXPIRATION_TIME;
/* just do 32-bit timestamps for just now - it's in the protocol */
return pgp_write_ss_header(sig->output, 5, tag) &&
pgp_write_scalar(sig->output, (uint32_t)when, (unsigned)sizeof(uint32_t));
}
/**
\ingroup Core_WritePackets
\brief Writes Public Key Session Key packet
\param info Write settings
\param pksk Public Key Session Key to write out
\return 1 if OK; else 0
*/
unsigned
pgp_write_pk_sesskey(pgp_output_t *output, pgp_pk_sesskey_t *pksk)
{
/* XXX - Flexelint - Pointer parameter 'pksk' (line 1076) could be declared as pointing to const */
if (pksk == NULL) {
(void) fprintf(stderr,
"pgp_write_pk_sesskey: NULL pksk\n");
return 0;
}
switch (pksk->alg) {
case PGP_PKA_RSA:
return pgp_write_ptag(output, PGP_PTAG_CT_PK_SESSION_KEY) &&
pgp_write_length(output, (unsigned)(1 + 8 + 1 +
BN_num_bytes(pksk->params.rsa.encrypted_m) + 2)) &&
pgp_write_scalar(output, (unsigned)pksk->version, 1) &&
pgp_write(output, pksk->key_id, 8) &&
pgp_write_scalar(output, (unsigned)pksk->alg, 1) &&
pgp_write_mpi(output, pksk->params.rsa.encrypted_m)
/* ?? && pgp_write_scalar(output, 0, 2); */
;
case PGP_PKA_DSA:
case PGP_PKA_ELGAMAL:
return pgp_write_ptag(output, PGP_PTAG_CT_PK_SESSION_KEY) &&
pgp_write_length(output, (unsigned)(1 + 8 + 1 +
BN_num_bytes(pksk->params.elgamal.g_to_k) + 2 +
BN_num_bytes(pksk->params.elgamal.encrypted_m) + 2)) &&
pgp_write_scalar(output, (unsigned)pksk->version, 1) &&
pgp_write(output, pksk->key_id, 8) &&
pgp_write_scalar(output, (unsigned)pksk->alg, 1) &&
pgp_write_mpi(output, pksk->params.elgamal.g_to_k) &&
pgp_write_mpi(output, pksk->params.elgamal.encrypted_m)
/* ?? && pgp_write_scalar(output, 0, 2); */
;
default:
(void) fprintf(stderr,
"pgp_write_pk_sesskey: bad algorithm\n");
return 0;
}
}
unsigned
pgp_write_mpi(pgp_output_t *output, const BIGNUM *bn)
{
unsigned bits;
uint8_t buf[NETPGP_BUFSIZ];
bits = (unsigned)BN_num_bits(bn);
if (bits > 65535) {
(void) fprintf(stderr, "pgp_write_mpi: too large %u\n", bits);
return 0;
}
BN_bn2bin(bn, buf);
return pgp_write_scalar(output, bits, 2) &&
pgp_write(output, buf, (bits + 7) / 8);
}
/**
* \ingroup Core_Signature
*
* Adds primary user ID to the signature
*
* \param sig
* \param primary
*/
void
pgp_add_primary_userid(pgp_create_sig_t *sig, unsigned primary)
{
pgp_write_ss_header(sig->output, 2, PGP_PTAG_SS_PRIMARY_USER_ID);
pgp_write_scalar(sig->output, primary, 1);
}
/*
* Note that we support v3 keys here because they're needed for
* verification.
*/
static unsigned
write_seckey_body(const pgp_seckey_t *key,
const uint8_t *passphrase,
const size_t pplen,
pgp_output_t *output)
{
/* RFC4880 Section 5.5.3 Secret-Key Packet Formats */
pgp_crypt_t crypted;
pgp_hash_t hash;
unsigned done = 0;
unsigned i = 0;
uint8_t *hashed;
uint8_t sesskey[CAST_KEY_LENGTH];
if (!write_pubkey_body(&key->pubkey, output)) {
return 0;
}
if (key->s2k_usage != PGP_S2KU_ENCRYPTED_AND_HASHED) {
(void) fprintf(stderr, "write_seckey_body: s2k usage\n");
return 0;
}
if (!pgp_write_scalar(output, (unsigned)key->s2k_usage, 1)) {
return 0;
}
if (key->alg != PGP_SA_CAST5) {
(void) fprintf(stderr, "write_seckey_body: algorithm\n");
return 0;
}
if (!pgp_write_scalar(output, (unsigned)key->alg, 1)) {
return 0;
}
if (key->s2k_specifier != PGP_S2KS_SIMPLE &&
key->s2k_specifier != PGP_S2KS_SALTED) {
/* = 1 \todo could also be iterated-and-salted */
(void) fprintf(stderr, "write_seckey_body: s2k spec\n");
return 0;
}
if (!pgp_write_scalar(output, (unsigned)key->s2k_specifier, 1)) {
return 0;
}
if (!pgp_write_scalar(output, (unsigned)key->hash_alg, 1)) {
return 0;
}
switch (key->s2k_specifier) {
case PGP_S2KS_SIMPLE:
/* nothing more to do */
break;
case PGP_S2KS_SALTED:
/* 8-octet salt value */
pgp_random(__UNCONST(&key->salt[0]), PGP_SALT_SIZE);
if (!pgp_write(output, key->salt, PGP_SALT_SIZE)) {
return 0;
}
break;
/*
* \todo case PGP_S2KS_ITERATED_AND_SALTED: // 8-octet salt
* value // 1-octet count break;
*/
default:
(void) fprintf(stderr,
"invalid/unsupported s2k specifier %d\n",
key->s2k_specifier);
return 0;
}
if (!pgp_write(output, &key->iv[0], pgp_block_size(key->alg))) {
return 0;
}
/*
* create the session key for encrypting the algorithm-specific
* fields
*/
switch (key->s2k_specifier) {
case PGP_S2KS_SIMPLE:
case PGP_S2KS_SALTED:
/* RFC4880: section 3.7.1.1 and 3.7.1.2 */
for (done = 0, i = 0; done < CAST_KEY_LENGTH; i++) {
unsigned hashsize;
unsigned j;
unsigned needed;
unsigned size;
uint8_t zero = 0;
/* Hard-coded SHA1 for session key */
pgp_hash_any(&hash, PGP_HASH_SHA1);
hashsize = pgp_hash_size(key->hash_alg);
needed = CAST_KEY_LENGTH - done;
size = MIN(needed, hashsize);
if ((hashed = calloc(1, hashsize)) == NULL) {
(void) fprintf(stderr, "write_seckey_body: bad alloc\n");
return 0;
}
if (!hash.init(&hash)) {
(void) fprintf(stderr, "write_seckey_body: bad alloc\n");
return 0;
}
/* preload if iterating */
for (j = 0; j < i; j++) {
/*
* Coverity shows a DEADCODE error on this
* line. This is expected since the hardcoded
* use of SHA1 and CAST5 means that it will
* not used. This will change however when
* other algorithms are supported.
*/
hash.add(&hash, &zero, 1);
}
if (key->s2k_specifier == PGP_S2KS_SALTED) {
hash.add(&hash, key->salt, PGP_SALT_SIZE);
}
hash.add(&hash, passphrase, (unsigned)pplen);
hash.finish(&hash, hashed);
/*
* if more in hash than is needed by session key, use
* the leftmost octets
*/
(void) memcpy(&sesskey[i * hashsize],
hashed, (unsigned)size);
done += (unsigned)size;
if (done > CAST_KEY_LENGTH) {
(void) fprintf(stderr,
"write_seckey_body: short add\n");
return 0;
}
}
break;
/*
* \todo case PGP_S2KS_ITERATED_AND_SALTED: * 8-octet salt
* value * 1-octet count break;
*/
default:
(void) fprintf(stderr,
"invalid/unsupported s2k specifier %d\n",
key->s2k_specifier);
return 0;
}
/* use this session key to encrypt */
pgp_crypt_any(&crypted, key->alg);
crypted.set_iv(&crypted, key->iv);
crypted.set_crypt_key(&crypted, sesskey);
pgp_encrypt_init(&crypted);
if (pgp_get_debug_level(__FILE__)) {
hexdump(stderr, "writing: iv=", key->iv, pgp_block_size(key->alg));
hexdump(stderr, "key= ", sesskey, CAST_KEY_LENGTH);
(void) fprintf(stderr, "\nturning encryption on...\n");
}
pgp_push_enc_crypt(output, &crypted);
switch (key->pubkey.alg) {
case PGP_PKA_RSA:
case PGP_PKA_RSA_ENCRYPT_ONLY:
case PGP_PKA_RSA_SIGN_ONLY:
if (!pgp_write_mpi(output, key->key.rsa.d) ||
!pgp_write_mpi(output, key->key.rsa.p) ||
!pgp_write_mpi(output, key->key.rsa.q) ||
!pgp_write_mpi(output, key->key.rsa.u)) {
if (pgp_get_debug_level(__FILE__)) {
(void) fprintf(stderr,
"4 x mpi not written - problem\n");
}
return 0;
}
break;
case PGP_PKA_DSA:
return pgp_write_mpi(output, key->key.dsa.x);
case PGP_PKA_ELGAMAL:
return pgp_write_mpi(output, key->key.elgamal.x);
default:
return 0;
}
if (!pgp_write(output, key->checkhash, PGP_CHECKHASH_SIZE)) {
return 0;
}
pgp_writer_pop(output);
return 1;
}
static unsigned add_key_prefs(pgp_create_sig_t *sig)
{
/* similar to pgp_add_key_prefs(), Mimic of GPG default settings, limited to supported algos */
return
/* Symmetric algo prefs */
pgp_write_ss_header(sig->output, 6, PGP_PTAG_SS_PREFERRED_SKA) &&
pgp_write_scalar(sig->output, PGP_SA_AES_256, 1) &&
pgp_write_scalar(sig->output, PGP_SA_AES_128, 1) &&
pgp_write_scalar(sig->output, PGP_SA_CAST5, 1) &&
pgp_write_scalar(sig->output, PGP_SA_TRIPLEDES, 1) &&
pgp_write_scalar(sig->output, PGP_SA_IDEA, 1) &&
/* Hash algo prefs, the first algo is the preferred algo */
pgp_write_ss_header(sig->output, 6, PGP_PTAG_SS_PREFERRED_HASH) &&
pgp_write_scalar(sig->output, PGP_HASH_SHA256, 1) &&
pgp_write_scalar(sig->output, PGP_HASH_SHA384, 1) &&
pgp_write_scalar(sig->output, PGP_HASH_SHA512, 1) &&
pgp_write_scalar(sig->output, PGP_HASH_SHA224, 1) &&
pgp_write_scalar(sig->output, PGP_HASH_SHA1, 1) && /* Edit for Autocrypt/Delta Chat: due to the weak SHA1, it should not be preferred */
/* Compression algo prefs */
pgp_write_ss_header(sig->output, 2/*1+number of following items*/, PGP_PTAG_SS_PREF_COMPRESS) &&
pgp_write_scalar(sig->output, PGP_C_ZLIB, 1) /*&& -- not sure if Delta Chat will support bzip2 on all platforms, however, this is not that important as typical files are compressed themselves and text is not that big
pgp_write_scalar(sig->output, PGP_C_BZIP2, 1) -- if you re-enable this, do not forget to modifiy the header count*/;
}
int dc_pgp_symm_encrypt(dc_context_t* context,
const char* passphrase,
const void* plain, size_t plain_bytes,
char** ret_ctext_armored)
{
int success = 0;
uint8_t salt[PGP_SALT_SIZE];
pgp_crypt_t crypt_info;
uint8_t* key = NULL;
pgp_output_t* payload_output = NULL;
pgp_memory_t* payload_mem = NULL;
pgp_output_t* encr_output = NULL;
pgp_memory_t* encr_mem = NULL;
if (context==NULL || passphrase==NULL || plain==NULL || plain_bytes==0
|| ret_ctext_armored==NULL ) {
goto cleanup;
}
//printf("\n~~~~~~~~~~~~~~~~~~~~SETUP-PAYLOAD~~~~~~~~~~~~~~~~~~~~\n%s~~~~~~~~~~~~~~~~~~~~/SETUP-PAYLOAD~~~~~~~~~~~~~~~~~~~~\n",key_asc); // DEBUG OUTPUT
/* put the payload into a literal data packet which will be encrypted then, see RFC 4880, 5.7 :
"When it has been decrypted, it contains other packets (usually a literal data packet or compressed data
packet, but in theory other Symmetrically Encrypted Data packets or sequences of packets that form whole OpenPGP messages)" */
pgp_setup_memory_write(&payload_output, &payload_mem, 128);
pgp_write_litdata(payload_output, (const uint8_t*)plain, plain_bytes, PGP_LDT_BINARY);
/* create salt for the key */
pgp_random(salt, PGP_SALT_SIZE);
/* S2K */
#define SYMM_ALGO PGP_SA_AES_128
if (!pgp_crypt_any(&crypt_info, SYMM_ALGO)) {
goto cleanup;
}
int s2k_spec = PGP_S2KS_ITERATED_AND_SALTED; // 0=simple, 1=salted, 3=salted+iterated
int s2k_iter_id = 96; // 0=1024 iterations, 96=65536 iterations
#define HASH_ALG PGP_HASH_SHA256
if ((key = pgp_s2k_do(passphrase, crypt_info.keysize, s2k_spec, HASH_ALG, salt, s2k_iter_id))==NULL) {
goto cleanup;
}
/* encrypt the payload using the key using AES-128 and put it into
OpenPGP's "Symmetric-Key Encrypted Session Key" (Tag 3, https://tools.ietf.org/html/rfc4880#section-5.3) followed by
OpenPGP's "Symmetrically Encrypted Data Packet" (Tag 18, https://tools.ietf.org/html/rfc4880#section-5.13 , better than Tag 9) */
pgp_setup_memory_write(&encr_output, &encr_mem, 128);
pgp_writer_push_armor_msg(encr_output);
/* Tag 3 - PGP_PTAG_CT_SK_SESSION_KEY */
pgp_write_ptag (encr_output, PGP_PTAG_CT_SK_SESSION_KEY);
pgp_write_length (encr_output, 1/*version*/
+ 1/*symm. algo*/
+ 1/*s2k_spec*/
+ 1/*S2 hash algo*/
+ ((s2k_spec==PGP_S2KS_SALTED || s2k_spec==PGP_S2KS_ITERATED_AND_SALTED)? PGP_SALT_SIZE : 0)/*the salt*/
+ ((s2k_spec==PGP_S2KS_ITERATED_AND_SALTED)? 1 : 0)/*number of iterations*/);
pgp_write_scalar (encr_output, 4, 1); // 1 octet: version
pgp_write_scalar (encr_output, SYMM_ALGO, 1); // 1 octet: symm. algo
pgp_write_scalar (encr_output, s2k_spec, 1); // 1 octet: s2k_spec
pgp_write_scalar (encr_output, HASH_ALG, 1); // 1 octet: S2 hash algo
if (s2k_spec==PGP_S2KS_SALTED || s2k_spec==PGP_S2KS_ITERATED_AND_SALTED) {
pgp_write (encr_output, salt, PGP_SALT_SIZE); // 8 octets: the salt
}
if (s2k_spec==PGP_S2KS_ITERATED_AND_SALTED) {
pgp_write_scalar (encr_output, s2k_iter_id, 1); // 1 octet: number of iterations
}
// for(int j=0; j<AES_KEY_LENGTH; j++) { printf("%02x", key[j]); } printf("\n----------------\n");
/* Tag 18 - PGP_PTAG_CT_SE_IP_DATA */
//pgp_write_symm_enc_data((const uint8_t*)payload_mem->buf, payload_mem->length, PGP_SA_AES_128, key, encr_output); //-- would generate Tag 9
{
uint8_t* iv = calloc(1, crypt_info.blocksize); if (iv==NULL) { goto cleanup; }
crypt_info.set_iv(&crypt_info, iv);
free(iv);
crypt_info.set_crypt_key(&crypt_info, &key[0]);
pgp_encrypt_init(&crypt_info);
pgp_write_se_ip_pktset(encr_output, payload_mem->buf, payload_mem->length, &crypt_info);
crypt_info.decrypt_finish(&crypt_info);
}
/* done with symmetric key block */
pgp_writer_close(encr_output);
*ret_ctext_armored = dc_null_terminate((const char*)encr_mem->buf, encr_mem->length);
//printf("\n~~~~~~~~~~~~~~~~~~~~SYMMETRICALLY ENCRYPTED~~~~~~~~~~~~~~~~~~~~\n%s~~~~~~~~~~~~~~~~~~~~/SYMMETRICALLY ENCRYPTED~~~~~~~~~~~~~~~~~~~~\n",encr_string); // DEBUG OUTPUT
success = 1;
cleanup:
if (payload_output) { pgp_output_delete(payload_output); }
if (payload_mem) { pgp_memory_free(payload_mem); }
if (encr_output) { pgp_output_delete(encr_output); }
if (encr_mem) { pgp_memory_free(encr_mem); }
free(key);
return success;
}
unsigned
pgp_writez(pgp_output_t *out, const uint8_t *data, const unsigned len)
{
compress_t *zip;
size_t sz_in;
size_t sz_out;
int ret;
int r = 0;
/* compress the data */
const int level = Z_DEFAULT_COMPRESSION; /* \todo allow varying
* levels */
if ((zip = calloc(1, sizeof(*zip))) == NULL) {
(void) fprintf(stderr, "pgp_writez: bad alloc\n");
return 0;
}
zip->stream.zalloc = Z_NULL;
zip->stream.zfree = Z_NULL;
zip->stream.opaque = NULL;
/* all other fields set to zero by use of calloc */
/* LINTED */ /* this is a lint problem in zlib.h header */
if ((int)deflateInit(&zip->stream, level) != Z_OK) {
(void) fprintf(stderr, "pgp_writez: can't initialise\n");
return 0;
}
/* do necessary transformation */
/* copy input to maintain const'ness of src */
if (zip->src != NULL || zip->dst != NULL) {
(void) fprintf(stderr, "pgp_writez: non-null streams\n");
return 0;
}
sz_in = len * sizeof(uint8_t);
sz_out = ((101 * sz_in) / 100) + 12; /* from zlib webpage */
if ((zip->src = calloc(1, sz_in)) == NULL) {
free(zip);
(void) fprintf(stderr, "pgp_writez: bad alloc2\n");
return 0;
}
if ((zip->dst = calloc(1, sz_out)) == NULL) {
free(zip->src);
free(zip);
(void) fprintf(stderr, "pgp_writez: bad alloc3\n");
return 0;
}
(void) memcpy(zip->src, data, len);
/* setup stream */
zip->stream.next_in = zip->src;
zip->stream.avail_in = (unsigned)sz_in;
zip->stream.total_in = 0;
zip->stream.next_out = zip->dst;
zip->stream.avail_out = (unsigned)sz_out;
zip->stream.total_out = 0;
do {
r = deflate(&zip->stream, Z_FINISH);
} while (r != Z_STREAM_END);
/* write it out */
ret = pgp_write_ptag(out, PGP_PTAG_CT_COMPRESSED) &&
pgp_write_length(out, (unsigned)(zip->stream.total_out + 1))&&
pgp_write_scalar(out, PGP_C_ZLIB, 1) &&
pgp_write(out, zip->dst, (unsigned)zip->stream.total_out);
free(zip->src);
free(zip->dst);
free(zip);
return ret;
}
