77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
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#include <string.h>
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#include <stdio.h>
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#include "libp2p/crypto/encoding/base16.h"
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/**
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* Encode in Base16 format
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* @param incoming the incoming bytes
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* @param incoming_length the length of the incoming bytes
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* @param results where to put the results
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* @param results_length the size of the buffer, and returns the actual length used
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* @returns true(1) on success
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*/
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int libp2p_crypto_encoding_base16_encode(const unsigned char* incoming, size_t incoming_length, unsigned char* results, size_t* results_length) {
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// the size will be 2x the size of incoming, so check that
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if (*results_length < incoming_length * 2)
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return 0;
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// clear out the results variable
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memset(results, 0, *results_length);
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*results_length = 0;
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for(int i = 0; i < incoming_length; i++) {
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unsigned char buf[3];
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sprintf(buf, "%02x", incoming[i]);
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results[i * 2] = buf[0];
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results[i * 2 + 1] = buf[1];
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*results_length += 2;
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}
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return 1;
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}
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/**
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* Calculate the size of the buffer necessary to encode
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* @param incoming_length the length of the incoming value
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* @returns the size of the buffer necessary to hold the encoded bytes
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*/
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int libp2p_crypto_encoding_base16_encode_size(size_t incoming_length) {
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return incoming_length * 2;
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}
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/**
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* Decode from Base16 format
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* @param incoming the incoming base16 encoded string
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* @param incoming_length the length of the incoming string (no need to include null)
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* @param results where to put the results
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* @param results_length the size of the buffer, and returns the actual length used
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* @returns true(1) on success
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*/
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int libp2p_crypto_encoding_base16_decode(const unsigned char* incoming, size_t incoming_length, unsigned char* results, size_t* results_length) {
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// buffer too small
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if (*results_length < incoming_length / 2)
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return 0;
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memset(results, 0, *results_length);
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unsigned char* pos = (char*)incoming;
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for(int i = 0; i < incoming_length / 2; i++) {
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sscanf(pos, "%2hhx", &results[i]);
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pos += 2;
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}
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return 1;
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}
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/**
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* Calculate the size of the buffer necessary to decode
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* @param incoming_length the length of the incoming value
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* @returns the size of the buffer necessary to hold the decoded bytes
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*/
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int libp2p_crypto_encoding_base16_decode_size(size_t incoming_length) {
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return incoming_length / 2;
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}
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