/* * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #ifndef OSSL_INTERNAL_PACKET_H # define OSSL_INTERNAL_PACKET_H # pragma once # include <string.h> # include <openssl/bn.h> # include <openssl/buffer.h> # include <openssl/crypto.h> # include <openssl/e_os2.h> # include "internal/numbers.h" typedef struct { /* Pointer to where we are currently reading from */ const unsigned char *curr; /* Number of bytes remaining */ size_t remaining; } PACKET; /* Internal unchecked shorthand; don't use outside this file. */ static ossl_inline void packet_forward(PACKET *pkt, size_t len) { pkt->curr += len; pkt->remaining -= len; } /* * Returns the number of bytes remaining to be read in the PACKET */ static ossl_inline size_t PACKET_remaining(const PACKET *pkt) { return pkt->remaining; } /* * Returns a pointer to the first byte after the packet data. * Useful for integrating with non-PACKET parsing code. * Specifically, we use PACKET_end() to verify that a d2i_... call * has consumed the entire packet contents. */ static ossl_inline const unsigned char *PACKET_end(const PACKET *pkt) { return pkt->curr + pkt->remaining; } /* * Returns a pointer to the PACKET's current position. * For use in non-PACKETized APIs. */ static ossl_inline const unsigned char *PACKET_data(const PACKET *pkt) { return pkt->curr; } /* * Initialise a PACKET with |len| bytes held in |buf|. This does not make a * copy of the data so |buf| must be present for the whole time that the PACKET * is being used. */ __owur static ossl_inline int PACKET_buf_init(PACKET *pkt, const unsigned char *buf, size_t len) { /* Sanity check for negative values. */ if (len > (size_t)(SIZE_MAX / 2)) return 0; pkt->curr = buf; pkt->remaining = len; return 1; } /* Initialize a PACKET to hold zero bytes. */ static ossl_inline void PACKET_null_init(PACKET *pkt) { pkt->curr = NULL; pkt->remaining = 0; } /* * Returns 1 if the packet has length |num| and its contents equal the |num| * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal). * If lengths are equal, performs the comparison in constant time. */ __owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr, size_t num) { if (PACKET_remaining(pkt) != num) return 0; return CRYPTO_memcmp(pkt->curr, ptr, num) == 0; } /* * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|. * Data is not copied: the |subpkt| packet will share its underlying buffer with * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. */ __owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt, PACKET *subpkt, size_t len) { if (PACKET_remaining(pkt) < len) return 0; return PACKET_buf_init(subpkt, pkt->curr, len); } /* * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not * copied: the |subpkt| packet will share its underlying buffer with the * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. */ __owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt, PACKET *subpkt, size_t len) { if (!PACKET_peek_sub_packet(pkt, subpkt, len)) return 0; packet_forward(pkt, len); return 1; } /* * Peek ahead at 2 bytes in network order from |pkt| and store the value in * |*data| */ __owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt, unsigned int *data) { if (PACKET_remaining(pkt) < 2) return 0; *data = ((unsigned int)(*pkt->curr)) << 8; *data |= *(pkt->curr + 1); return 1; } /* Equivalent of n2s */ /* Get 2 bytes in network order from |pkt| and store the value in |*data| */ __owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data) { if (!PACKET_peek_net_2(pkt, data)) return 0; packet_forward(pkt, 2); 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| */ __owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt, unsigned long *data) { if (PACKET_remaining(pkt) < 3) return 0; *data = ((unsigned long)(*pkt->curr)) << 16; *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; *data |= *(pkt->curr + 2); return 1; } /* Equivalent of n2l3 */ /* Get 3 bytes in network order from |pkt| and store the value in |*data| */ __owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data) { if (!PACKET_peek_net_3(pkt, data)) return 0; packet_forward(pkt, 3); 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| */ __owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt, unsigned long *data) { if (PACKET_remaining(pkt) < 4) return 0; *data = ((unsigned long)(*pkt->curr)) << 24; *data |= ((unsigned long)(*(pkt->curr + 1))) << 16; *data |= ((unsigned long)(*(pkt->curr + 2))) << 8; *data |= *(pkt->curr + 3); return 1; } /* Equivalent of n2l */ /* Get 4 bytes in network order from |pkt| and store the value in |*data| */ __owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data) { if (!PACKET_peek_net_4(pkt, data)) return 0; packet_forward(pkt, 4); 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) { if (!PACKET_remaining(pkt)) return 0; *data = *pkt->curr; return 1; } /* Get 1 byte from |pkt| and store the value in |*data| */ __owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data) { if (!PACKET_peek_1(pkt, data)) return 0; packet_forward(pkt, 1); 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| */ __owur static ossl_inline int PACKET_peek_4(const PACKET *pkt, unsigned long *data) { if (PACKET_remaining(pkt) < 4) return 0; *data = *pkt->curr; *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; *data |= ((unsigned long)(*(pkt->curr + 2))) << 16; *data |= ((unsigned long)(*(pkt->curr + 3))) << 24; return 1; } /* Equivalent of c2l */ /* * Get 4 bytes in reverse network order from |pkt| and store the value in * |*data| */ __owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data) { if (!PACKET_peek_4(pkt, data)) return 0; packet_forward(pkt, 4); return 1; } /* * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in * |*data|. This just points at the underlying buffer that |pkt| is using. The * caller should not free this data directly (it will be freed when the * underlying buffer gets freed */ __owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt, const unsigned char **data, size_t len) { if (PACKET_remaining(pkt) < len) return 0; *data = pkt->curr; return 1; } /* * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This * just points at the underlying buffer that |pkt| is using. The caller should * not free this data directly (it will be freed when the underlying buffer gets * freed */ __owur static ossl_inline int PACKET_get_bytes(PACKET *pkt, const unsigned char **data, size_t len) { if (!PACKET_peek_bytes(pkt, data, len)) return 0; packet_forward(pkt, len); return 1; } /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */ __owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt, unsigned char *data, size_t len) { if (PACKET_remaining(pkt) < len) return 0; memcpy(data, pkt->curr, len); return 1; } /* * Read |len| bytes from |pkt| and copy them to |data|. * The caller is responsible for ensuring that |data| can hold |len| bytes. */ __owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt, unsigned char *data, size_t len) { if (!PACKET_peek_copy_bytes(pkt, data, len)) return 0; packet_forward(pkt, len); return 1; } /* * Copy packet data to |dest|, and set |len| to the number of copied bytes. * If the packet has more than |dest_len| bytes, nothing is copied. * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise. * Does not forward PACKET position (because it is typically the last thing * done with a given PACKET). */ __owur static ossl_inline int PACKET_copy_all(const PACKET *pkt, unsigned char *dest, size_t dest_len, size_t *len) { if (PACKET_remaining(pkt) > dest_len) { *len = 0; return 0; } *len = pkt->remaining; memcpy(dest, pkt->curr, pkt->remaining); return 1; } /* * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the * result in |*data|, and the length in |len|. * If |*data| is not NULL, the old data is OPENSSL_free'd. * If the packet is empty, or malloc fails, |*data| will be set to NULL. * Returns 1 if the malloc succeeds and 0 otherwise. * Does not forward PACKET position (because it is typically the last thing * done with a given PACKET). */ __owur static ossl_inline int PACKET_memdup(const PACKET *pkt, unsigned char **data, size_t *len) { size_t length; OPENSSL_free(*data); *data = NULL; *len = 0; length = PACKET_remaining(pkt); if (length == 0) return 1; *data = OPENSSL_memdup(pkt->curr, length); if (*data == NULL) return 0; *len = length; return 1; } /* * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated * buffer. Store a pointer to the result in |*data|. * If |*data| is not NULL, the old data is OPENSSL_free'd. * If the data in |pkt| does not contain a NUL-byte, the entire data is * copied and NUL-terminated. * Returns 1 if the malloc succeeds and 0 otherwise. * Does not forward PACKET position (because it is typically the last thing done * with a given PACKET). */ __owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data) { OPENSSL_free(*data); /* This will succeed on an empty packet, unless pkt->curr == NULL. */ *data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt)); return (*data != NULL); } /* Returns 1 if |pkt| contains at least one 0-byte, 0 otherwise. */ static ossl_inline int PACKET_contains_zero_byte(const PACKET *pkt) { return memchr(pkt->curr, 0, pkt->remaining) != NULL; } /* Move the current reading position forward |len| bytes */ __owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len) { if (PACKET_remaining(pkt) < len) return 0; packet_forward(pkt, len); return 1; } /* * Reads a variable-length vector prefixed with a one-byte length, and stores * the contents in |subpkt|. |pkt| can equal |subpkt|. * Data is not copied: the |subpkt| packet will share its underlying buffer with * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. * Upon failure, the original |pkt| and |subpkt| are not modified. */ __owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt, PACKET *subpkt) { unsigned int length; const unsigned char *data; PACKET tmp = *pkt; if (!PACKET_get_1(&tmp, &length) || !PACKET_get_bytes(&tmp, &data, (size_t)length)) { return 0; } *pkt = tmp; subpkt->curr = data; subpkt->remaining = length; return 1; } /* * Like PACKET_get_length_prefixed_1, but additionally, fails when there are * leftover bytes in |pkt|. */ __owur static ossl_inline int PACKET_as_length_prefixed_1(PACKET *pkt, PACKET *subpkt) { unsigned int length; const unsigned char *data; PACKET tmp = *pkt; if (!PACKET_get_1(&tmp, &length) || !PACKET_get_bytes(&tmp, &data, (size_t)length) || PACKET_remaining(&tmp) != 0) { return 0; } *pkt = tmp; subpkt->curr = data; subpkt->remaining = length; return 1; } /* * Reads a variable-length vector prefixed with a two-byte length, and stores * the contents in |subpkt|. |pkt| can equal |subpkt|. * Data is not copied: the |subpkt| packet will share its underlying buffer with * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. * Upon failure, the original |pkt| and |subpkt| are not modified. */ __owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt, PACKET *subpkt) { unsigned int length; const unsigned char *data; PACKET tmp = *pkt; if (!PACKET_get_net_2(&tmp, &length) || !PACKET_get_bytes(&tmp, &data, (size_t)length)) { return 0; } *pkt = tmp; subpkt->curr = data; subpkt->remaining = length; return 1; } /* * Like PACKET_get_length_prefixed_2, but additionally, fails when there are * leftover bytes in |pkt|. */ __owur static ossl_inline int PACKET_as_length_prefixed_2(PACKET *pkt, PACKET *subpkt) { unsigned int length; const unsigned char *data; PACKET tmp = *pkt; if (!PACKET_get_net_2(&tmp, &length) || !PACKET_get_bytes(&tmp, &data, (size_t)length) || PACKET_remaining(&tmp) != 0) { return 0; } *pkt = tmp; subpkt->curr = data; subpkt->remaining = length; return 1; } /* * Reads a variable-length vector prefixed with a three-byte length, and stores * the contents in |subpkt|. |pkt| can equal |subpkt|. * Data is not copied: the |subpkt| packet will share its underlying buffer with * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. * Upon failure, the original |pkt| and |subpkt| are not modified. */ __owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt, PACKET *subpkt) { unsigned long length; const unsigned char *data; PACKET tmp = *pkt; if (!PACKET_get_net_3(&tmp, &length) || !PACKET_get_bytes(&tmp, &data, (size_t)length)) { return 0; } *pkt = tmp; subpkt->curr = data; subpkt->remaining = length; return 1; } /* Writeable packets */ typedef struct wpacket_sub WPACKET_SUB; struct wpacket_sub { /* The parent WPACKET_SUB if we have one or NULL otherwise */ WPACKET_SUB *parent; /* * Offset into the buffer where the length of this WPACKET goes. We use an * offset in case the buffer grows and gets reallocated. */ size_t packet_len; /* Number of bytes in the packet_len or 0 if we don't write the length */ size_t lenbytes; /* Number of bytes written to the buf prior to this packet starting */ size_t pwritten; /* Flags for this sub-packet */ unsigned int flags; }; typedef struct wpacket_st WPACKET; struct wpacket_st { /* 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. */ size_t curr; /* Number of bytes written so far */ size_t written; /* Maximum number of bytes we will allow to be written to this WPACKET */ size_t maxsize; /* Our sub-packets (always at least one if not finished) */ WPACKET_SUB *subs; /* Writing from the end first? */ unsigned int endfirst : 1; }; /* Flags */ /* Default */ #define WPACKET_FLAGS_NONE 0 /* Error on WPACKET_close() if no data written to the WPACKET */ #define WPACKET_FLAGS_NON_ZERO_LENGTH 1 /* * Abandon all changes on WPACKET_close() if no data written to the WPACKET, * i.e. this does not write out a zero packet length */ #define WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH 2 /* * Initialise a WPACKET with the buffer in |buf|. The buffer must exist * for the whole time that the WPACKET is being used. Additionally |lenbytes| of * data is preallocated at the start of the buffer to store the length of the * WPACKET once we know it. */ int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes); /* * Same as WPACKET_init_len except there is no preallocation of the WPACKET * length. */ int WPACKET_init(WPACKET *pkt, BUF_MEM *buf); /* * Same as WPACKET_init_len except there is no underlying buffer. No data is * ever actually written. We just keep track of how much data would have been * written if a buffer was there. */ int WPACKET_init_null(WPACKET *pkt, size_t lenbytes); /* * Same as WPACKET_init_null except we set the WPACKET to assume DER length * encoding for sub-packets. */ int WPACKET_init_null_der(WPACKET *pkt); /* * 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); /* * Same as WPACKET_init_static_len except lenbytes is always 0, and we set the * WPACKET to write to the end of the buffer moving towards the start and use * DER length encoding for sub-packets. */ int WPACKET_init_der(WPACKET *pkt, unsigned char *buf, size_t len); /* * Set the flags to be applied to the current sub-packet */ int WPACKET_set_flags(WPACKET *pkt, unsigned int flags); /* * Closes the most recent sub-packet. It also writes out the length of the * packet to the required location (normally the start of the WPACKET) if * appropriate. The top level WPACKET should be closed using WPACKET_finish() * instead of this function. */ int WPACKET_close(WPACKET *pkt); /* * The same as WPACKET_close() but only for the top most WPACKET. Additionally * frees memory resources for this WPACKET. */ 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 * call this directly. Use the convenience macros below instead. */ int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes); /* * Convenience macros for calling WPACKET_start_sub_packet_len with different * lengths */ #define WPACKET_start_sub_packet_u8(pkt) \ WPACKET_start_sub_packet_len__((pkt), 1) #define WPACKET_start_sub_packet_u16(pkt) \ WPACKET_start_sub_packet_len__((pkt), 2) #define WPACKET_start_sub_packet_u24(pkt) \ WPACKET_start_sub_packet_len__((pkt), 3) #define WPACKET_start_sub_packet_u32(pkt) \ WPACKET_start_sub_packet_len__((pkt), 4) /* * Same as WPACKET_start_sub_packet_len__() except no bytes are pre-allocated * for the sub-packet length. */ int WPACKET_start_sub_packet(WPACKET *pkt); /* * 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|. |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 len, unsigned char **allocbytes); /* * The same as WPACKET_allocate_bytes() except additionally a new sub-packet is * started for the allocated bytes, and then closed immediately afterwards. The * number of length bytes for the sub-packet is in |lenbytes|. Don't call this * directly. Use the convenience macros below instead. */ int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len, unsigned char **allocbytes, size_t lenbytes); /* * Convenience macros for calling WPACKET_sub_allocate_bytes with different * lengths */ #define WPACKET_sub_allocate_bytes_u8(pkt, len, bytes) \ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 1) #define WPACKET_sub_allocate_bytes_u16(pkt, len, bytes) \ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 2) #define WPACKET_sub_allocate_bytes_u24(pkt, len, bytes) \ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 3) #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_get_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 * accommodated in |bytes| storage, e.g. attempting to write the value 256 into * 1 byte will fail. Don't call this directly. Use the convenience macros below * instead. */ int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t bytes); /* * Convenience macros for calling WPACKET_put_bytes with different * lengths */ #define WPACKET_put_bytes_u8(pkt, val) \ WPACKET_put_bytes__((pkt), (val), 1) #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) #define WPACKET_put_bytes_u32(pkt, val) \ 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); /* Copy |len| bytes of data from |*src| into the WPACKET. */ int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len); /* Set |len| bytes of data to |ch| into the WPACKET. */ int WPACKET_memset(WPACKET *pkt, int ch, size_t len); /* * Copy |len| bytes of data from |*src| into the WPACKET and prefix with its * length (consuming |lenbytes| of data for the length). Don't call this * directly. Use the convenience macros below instead. */ int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len, size_t lenbytes); /* Convenience macros for calling WPACKET_sub_memcpy with different lengths */ #define WPACKET_sub_memcpy_u8(pkt, src, len) \ 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_u24(pkt, src, len) \ WPACKET_sub_memcpy__((pkt), (src), (len), 3) #define WPACKET_sub_memcpy_u32(pkt, src, len) \ WPACKET_sub_memcpy__((pkt), (src), (len), 4) /* * Return the total number of bytes written so far to the underlying buffer * including any storage allocated for length bytes */ int WPACKET_get_total_written(WPACKET *pkt, size_t *written); /* * Returns the length of the current sub-packet. This excludes any bytes * allocated for the length itself. */ 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); /* Returns true if the underlying buffer is actually NULL */ int WPACKET_is_null_buf(WPACKET *pkt); /* Release resources in a WPACKET if a failure has occurred. */ void WPACKET_cleanup(WPACKET *pkt); #endif /* OSSL_INTERNAL_PACKET_H */