110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "libp2p/secio/exchange.h"
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#include "protobuf.h"
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// epubkey signature
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enum WireType secio_exchange_message_fields[] = { WIRETYPE_LENGTH_DELIMITED, WIRETYPE_LENGTH_DELIMITED };
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struct Exchange* libp2p_secio_exchange_new() {
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struct Exchange* out = (struct Exchange*)malloc(sizeof(struct Exchange));
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if (out != NULL) {
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out->epubkey = NULL;
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out->epubkey_size = 0;
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out->signature = NULL;
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out->signature_size = 0;
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}
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return out;
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}
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void libp2p_secio_exchange_free( struct Exchange* in) {
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if (in != NULL) {
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if (in->epubkey != NULL)
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free(in->epubkey);
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if (in->signature != NULL)
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free(in->signature);
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free(in);
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}
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}
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/**
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* retrieves the approximate size of an encoded version of the passed in struct
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* @param in the struct to look at
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* @reutrns the size of buffer needed
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*/
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size_t libp2p_secio_exchange_protobuf_encode_size(struct Exchange* in) {
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size_t retVal = 0;
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retVal += 11 + in->epubkey_size;
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retVal += 11 + in->signature_size;
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return retVal;
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}
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/**
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* Encode the struct Exchange in protobuf format
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* @param in the struct to be encoded
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* @param buffer where to put the results
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* @param max_buffer_length the max to write
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* @param bytes_written how many bytes were written to the buffer
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* @returns true(1) on success, otherwise false(0)
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*/
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int libp2p_secio_exchange_protobuf_encode(struct Exchange* in, unsigned char* buffer, size_t max_buffer_length, size_t* bytes_written) {
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*bytes_written = 0;
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size_t bytes_used;
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// epubkey
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if (!protobuf_encode_length_delimited(1, secio_exchange_message_fields[0], (char*)in->epubkey, in->epubkey_size, &buffer[*bytes_written], max_buffer_length - *bytes_written, &bytes_used))
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return 0;
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*bytes_written += bytes_used;
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// signature
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if (!protobuf_encode_length_delimited(2, secio_exchange_message_fields[1], (char*)in->signature, in->signature_size, &buffer[*bytes_written], max_buffer_length - *bytes_written, &bytes_used))
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return 0;
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*bytes_written += bytes_used;
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return 1;
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}
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/**
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* Turns a protobuf array into an Exchange struct
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* @param buffer the protobuf array
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* @param buffer_length the length of the buffer
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* @param out a pointer to the new struct Exchange NOTE: this method allocates memory
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* @returns true(1) on success, otherwise false(0)
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*/
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int libp2p_secio_exchange_protobuf_decode(unsigned char* buffer, size_t buffer_length, struct Exchange** out) {
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size_t pos = 0;
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int retVal = 0;
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if ( (*out = libp2p_secio_exchange_new()) == NULL)
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goto exit;
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while(pos < buffer_length) {
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size_t bytes_read = 0;
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int field_no;
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enum WireType field_type;
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if (protobuf_decode_field_and_type(&buffer[pos], buffer_length, &field_no, &field_type, &bytes_read) == 0) {
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goto exit;
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}
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pos += bytes_read;
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switch(field_no) {
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case (1): // epubkey
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if (protobuf_decode_length_delimited(&buffer[pos], buffer_length - pos, (char**)&((*out)->epubkey), &((*out)->epubkey_size), &bytes_read) == 0)
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goto exit;
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pos += bytes_read;
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break;
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case (2): // signature
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if (protobuf_decode_length_delimited(&buffer[pos], buffer_length - pos, (char**)&((*out)->signature), &((*out)->signature_size), &bytes_read) == 0)
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goto exit;
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pos += bytes_read;
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break;
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}
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}
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retVal = 1;
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exit:
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if (retVal == 0) {
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libp2p_secio_exchange_free(*out);
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}
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return retVal;
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}
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