openssl support

1 files changed, 902 insertions, 0 deletions

diff --git a/NorthstarDedicatedTest/include/internal/packet.h b/NorthstarDedicatedTest/include/internal/packet.h
new file mode 100644
index 00000000..170997db
--- /dev/null
+++ b/NorthstarDedicatedTest/include/internal/packet.h
@@ -0,0 +1,902 @@
+/*
+ * 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 */