return 1;
}
+/* Same as PACKET_get_net_2() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_2_len(PACKET *pkt, size_t *data)
+{
+ unsigned int i;
+ int ret = PACKET_get_net_2(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/*
* Peek ahead at 3 bytes in network order from |pkt| and store the value in
* |*data|
return 1;
}
+/* Same as PACKET_get_net_3() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_3_len(PACKET *pkt, size_t *data)
+{
+ unsigned long i;
+ int ret = PACKET_get_net_3(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/*
* Peek ahead at 4 bytes in network order from |pkt| and store the value in
* |*data|
return 1;
}
+/* Same as PACKET_get_net_4() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_4_len(PACKET *pkt, size_t *data)
+{
+ unsigned long i;
+ int ret = PACKET_get_net_4(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_peek_1(const PACKET *pkt,
unsigned int *data)
return 1;
}
+/* Same as PACKET_get_1() but for a size_t */
+__owur static ossl_inline int PACKET_get_1_len(PACKET *pkt, size_t *data)
+{
+ unsigned int i;
+ int ret = PACKET_get_1(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/*
* Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
* in |*data|
/* The buffer where we store the output data */
BUF_MEM *buf;
+ /* Fixed sized buffer which can be used as an alternative to buf */
+ unsigned char *staticbuf;
+
/*
* Offset into the buffer where we are currently writing. We use an offset
* in case the buffer grows and gets reallocated.
*/
int WPACKET_init(WPACKET *pkt, BUF_MEM *buf);
+/*
+ * Same as WPACKET_init_len except we do not use a growable BUF_MEM structure.
+ * A fixed buffer of memory |buf| of size |len| is used instead. A failure will
+ * occur if you attempt to write beyond the end of the buffer
+ */
+int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len,
+ size_t lenbytes);
/*
* Set the flags to be applied to the current sub-packet
*/
*/
int WPACKET_finish(WPACKET *pkt);
+/*
+ * Iterate through all the sub-packets and write out their lengths as if they
+ * were being closed. The lengths will be overwritten with the final lengths
+ * when the sub-packets are eventually closed (which may be different if more
+ * data is added to the WPACKET). This function fails if a sub-packet is of 0
+ * length and WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH is set.
+ */
+int WPACKET_fill_lengths(WPACKET *pkt);
+
/*
* Initialise a new sub-packet. Additionally |lenbytes| of data is preallocated
* at the start of the sub-packet to store its length once we know it. Don't
/*
* Allocate bytes in the WPACKET for the output. This reserves the bytes
* and counts them as "written", but doesn't actually do the writing. A pointer
- * to the allocated bytes is stored in |*allocbytes|.
+ * to the allocated bytes is stored in |*allocbytes|. |allocbytes| may be NULL.
+ * WARNING: the allocated bytes must be filled in immediately, without further
+ * WPACKET_* calls. If not then the underlying buffer may be realloc'd and
+ * change its location.
*/
-int WPACKET_allocate_bytes(WPACKET *pkt, size_t bytes,
+int WPACKET_allocate_bytes(WPACKET *pkt, size_t len,
unsigned char **allocbytes);
/*
#define WPACKET_sub_allocate_bytes_u32(pkt, len, bytes) \
WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 4)
+/*
+ * The same as WPACKET_allocate_bytes() except the reserved bytes are not
+ * actually counted as written. Typically this will be for when we don't know
+ * how big arbitrary data is going to be up front, but we do know what the
+ * maximum size will be. If this function is used, then it should be immediately
+ * followed by a WPACKET_allocate_bytes() call before any other WPACKET
+ * functions are called (unless the write to the allocated bytes is abandoned).
+ *
+ * For example: If we are generating a signature, then the size of that
+ * signature may not be known in advance. We can use WPACKET_reserve_bytes() to
+ * handle this:
+ *
+ * if (!WPACKET_sub_reserve_bytes_u16(&pkt, EVP_PKEY_size(pkey), &sigbytes1)
+ * || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0
+ * || !WPACKET_sub_allocate_bytes_u16(&pkt, siglen, &sigbytes2)
+ * || sigbytes1 != sigbytes2)
+ * goto err;
+ */
+int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes);
+
+/*
+ * The "reserve_bytes" equivalent of WPACKET_sub_allocate_bytes__()
+ */
+int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes, size_t lenbytes);
+
+/*
+ * Convenience macros for WPACKET_sub_reserve_bytes with different lengths
+ */
+#define WPACKET_sub_reserve_bytes_u8(pkt, len, bytes) \
+ WPACKET_reserve_bytes__((pkt), (len), (bytes), 1)
+#define WPACKET_sub_reserve_bytes_u16(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 2)
+#define WPACKET_sub_reserve_bytes_u24(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 3)
+#define WPACKET_sub_reserve_bytes_u32(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 4)
+
/*
* Write the value stored in |val| into the WPACKET. The value will consume
* |bytes| amount of storage. An error will occur if |val| cannot be
#define WPACKET_put_bytes_u16(pkt, val) \
WPACKET_put_bytes__((pkt), (val), 2)
#define WPACKET_put_bytes_u24(pkt, val) \
- WPACKET_put_bytes__((pkt), (val)), 3)
+ WPACKET_put_bytes__((pkt), (val), 3)
#define WPACKET_put_bytes_u32(pkt, val) \
- WPACKET_sub_allocate_bytes__((pkt), (val), 4)
+ WPACKET_put_bytes__((pkt), (val), 4)
/* Set a maximum size that we will not allow the WPACKET to grow beyond */
int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize);
WPACKET_sub_memcpy__((pkt), (src), (len), 1)
#define WPACKET_sub_memcpy_u16(pkt, src, len) \
WPACKET_sub_memcpy__((pkt), (src), (len), 2)
-#define WPACKET_sub_memcpy_bytes_u24(pkt, src, len) \
+#define WPACKET_sub_memcpy_u24(pkt, src, len) \
WPACKET_sub_memcpy__((pkt), (src), (len), 3)
-#define WPACKET_sub_memcpy_bytes_u32(pkt, src, len) \
+#define WPACKET_sub_memcpy_u32(pkt, src, len) \
WPACKET_sub_memcpy__((pkt), (src), (len), 4)
/*
*/
int WPACKET_get_length(WPACKET *pkt, size_t *len);
+/*
+ * Returns a pointer to the current write location, but does not allocate any
+ * bytes.
+ */
+unsigned char *WPACKET_get_curr(WPACKET *pkt);
+
/* Release resources in a WPACKET if a failure has occurred. */
void WPACKET_cleanup(WPACKET *pkt);