30 #define MAX_BUFFER_BLOCKS 257
63 #define OFFSET(x) offsetof(CryptoContext, x)
64 #define D AV_OPT_FLAG_DECODING_PARAM
65 #define E AV_OPT_FLAG_ENCODING_PARAM
84 uint8_t *default_buf,
int default_buf_len,
88 if (!default_buf_len) {
91 }
else if (default_buf_len !=
BLOCKSIZE) {
93 "invalid %s size (%d bytes, block size is %d)\n",
97 *buf =
av_memdup(default_buf, default_buf_len);
100 *buf_len = default_buf_len;
103 "invalid %s size (%d bytes, block size is %d)\n",
112 const char *nested_url;
126 c->key,
c->keylen,
"decryption key")) < 0)
129 c->iv,
c->ivlen,
"decryption IV")) < 0)
135 c->key,
c->keylen,
"encryption key")) < 0)
139 c->iv,
c->ivlen,
"encryption IV")) < 0)
145 h->protocol_whitelist,
h->protocol_blacklist,
h)) < 0) {
152 if (!
c->aes_decrypt) {
161 if (
c->hd->is_streamed)
162 h->is_streamed =
c->hd->is_streamed;
167 if (!
c->aes_encrypt) {
188 if (
c->outdata > 0) {
190 memcpy(buf,
c->outptr,
size);
193 c->position =
c->position +
size;
202 sizeof(
c->inbuffer) -
c->indata);
215 blocks,
c->decrypt_iv, 1);
217 c->outptr =
c->outbuffer;
219 if (
c->indata_used >=
sizeof(
c->inbuffer)/2) {
220 memmove(
c->inbuffer,
c->inbuffer +
c->indata_used,
221 c->indata -
c->indata_used);
222 c->indata -=
c->indata_used;
227 int padding =
c->outbuffer[
c->outdata - 1];
228 c->outdata -= padding;
241 "Crypto: seek not supported for write\r\n");
259 "Crypto: seek_end - can't get file size (pos=%lld)\r\n", (
long long int)
pos);
268 "Crypto: no support for seek where 'whence' is %d\r\n", whence);
275 c->outptr =
c->outbuffer;
282 memcpy(
c->decrypt_iv,
c->iv,
c->ivlen );
296 "Crypto: nested protocol no support for seek or seek failed\n");
302 if (
pos -
c->position) {
317 char errbuf[100] =
"unknown error";
320 "Crypto: discard read did not get all the bytes (%d remain) - read returned (%d)-%s\n",
332 int total_size, blocks, pad_len,
out_size;
335 total_size =
size +
c->pad_len;
347 memcpy(&
c->pad[
c->pad_len], buf,
BLOCKSIZE -
c->pad_len);
355 blocks,
c->encrypt_iv, 0);
361 memcpy(
c->pad, &buf[
size - pad_len], pad_len);
363 memcpy(&
c->pad[
c->pad_len], buf,
size);
365 c->pad_len = pad_len;
375 if (
c->aes_encrypt) {
379 memset(&
c->pad[
c->pad_len], pad, pad);
int ffurl_read(URLContext *h, unsigned char *buf, int size)
Read up to size bytes from the resource accessed by h, and store the read bytes in buf.
int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)
Create an URLContext for accessing to the resource indicated by url, and open it.
int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
Change the position that will be used by the next read/write operation on the resource accessed by h.
int ffurl_closep(URLContext **hh)
Close the resource accessed by the URLContext h, and free the memory used by it.
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
#define AVIO_FLAG_READ
read-only
#define AVSEEK_SIZE
ORing this as the "whence" parameter to a seek function causes it to return the filesize without seek...
#define AVIO_FLAG_WRITE
write-only
#define flags(name, subs,...)
static int64_t crypto_seek(URLContext *h, int64_t pos, int whence)
static int set_aes_arg(URLContext *h, uint8_t **buf, int *buf_len, uint8_t *default_buf, int default_buf_len, const char *desc)
static const AVOption options[]
static int crypto_write(URLContext *h, const unsigned char *buf, int size)
static int crypto_open2(URLContext *h, const char *uri, int flags, AVDictionary **options)
#define MAX_BUFFER_BLOCKS
const URLProtocol ff_crypto_protocol
static int crypto_close(URLContext *h)
static const AVClass crypto_class
static int crypto_read(URLContext *h, uint8_t *buf, int size)
@ AV_OPT_TYPE_BINARY
offset must point to a pointer immediately followed by an int for the length
int av_aes_init(AVAES *a, const uint8_t *key, int key_bits, int decrypt)
Initialize an AVAES context.
struct AVAES * av_aes_alloc(void)
Allocate an AVAES context.
void av_aes_crypt(AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
#define AVERROR_EOF
End of file.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
const char * av_default_item_name(void *ptr)
Return the context name.
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
void * av_memdup(const void *p, size_t size)
Duplicate a buffer with av_malloc().
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
#define LIBAVUTIL_VERSION_INT
common internal API header
Describe the class of an AVClass context structure.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
struct AVAES * aes_encrypt
struct AVAES * aes_decrypt
uint8_t inbuffer[BLOCKSIZE *MAX_BUFFER_BLOCKS]
unsigned int write_buf_size
uint8_t outbuffer[BLOCKSIZE *MAX_BUFFER_BLOCKS]
unbuffered private I/O API
#define URL_PROTOCOL_FLAG_NESTED_SCHEME