Removal of old implementation of multihash
John Jones
parent
466bfe3fa4
commit
7b218a620a
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@ -1,61 +0,0 @@
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/**
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* An implementation of the multihash protocol in C
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*/
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#ifndef __LIBP2P_MULTIHASH_H
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#define __LIBP2P_MULTIHASH_H
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#define MULTIHASH_SHA1 0x11
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#define MULTIHASH_SHA2_256 0x12
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#define MULTIHASH_SHA2_512 0x13
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#define MULTIHASH_SHA3_512 0x14
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#define MULTIHASH_SHA3_384 0x15
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#define MULTIHASH_SHA3_256 0x16
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#define MULTIHASH_SHA3_224 0x17
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#define MULTIHASH_SHAKE_128 0x18
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#define MULTIHASH_SHAKE_256 0x19
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#define MULTIHASH_BLAKE2B 0x20
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#define MULTIHASH_BLAKE2S 0x21
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struct MultiHash {
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char fn_code;
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char size;
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unsigned char* data;
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};
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char* libp2p_multihash_get_fn_name(char fn_code);
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/**
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* encodes the multihash into a hex string
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*/
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int libp2p_multihash_hex_string(struct MultiHash* hash, char* string, int max_length);
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/**
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* decodes a hex string into a multihash
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*/
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int libp2p_multihash_from_hex_string(char* string, int length, struct MultiHash* hash);
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/**
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* turns a multihash into a b58 string
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* @param hash the Multihash to encode
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* @param binary_buffer the buffer to fill
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* @param max_length the size of the buffer
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* @returns true(1) on success
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*/
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int libp2p_multihash_to_b58(struct MultiHash* hash, unsigned char* binary_buffer, size_t max_length);
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/**
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* turns a base58 encoded string into a MultiHash
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* @param b58_string the base58 encoded string
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* @param b58_string_length the length of the encoded string
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* @param hash the MultiHash to fill
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* @returns true(1) on success
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*/
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int libp2p_b58_to_multihash(unsigned char* b58_string, size_t b58_string_length, struct MultiHash* hash);
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/**
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* retrieve the size required for the multihash that is embedded in the base58 encoded string
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*/
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size_t libp2p_multihash_b58_size(unsigned char* b58_string);
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#endif /* multihash_h */
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@ -1,179 +0,0 @@
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#include "../include/libp2p/multihash_old/multihash.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libp2p/crypto/encoding/base58.h"
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char* libp2p_multihash_get_fn_name(char fn_code) {
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switch(fn_code) {
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case (0x11):
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return "sha1";
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case(0x12):
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return "sha2-256";
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case(0x13):
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return "sha2-512";
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case(0x14):
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return "sha3-512";
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case(0x15):
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return "sha3-384";
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case(0x16):
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return "sha3-256";
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case(0x17):
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return "sha3-224";
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case(0x18):
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return "shake-128";
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case(0x19):
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return "shake-256";
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case(0x20):
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return "blake2b";
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case(0x21):
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return "blake2s";
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}
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return 0x00;
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}
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/**
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* helper function to convert a char string to a byte
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* @param s the string (only grabs the first character)
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* @returns the value of the char
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*/
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unsigned char from_hex_to_char(const char* s) {
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// make sure there is a null in position 3
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char buff[3];
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buff[0] = s[0];
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buff[1] = s[1];
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buff[2] = 0;
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char* ptr = &buff[2];
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return strtoul(buff, &ptr, 16);
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}
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/***
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* convert a MultiHash into a byte array
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* @param hash the MultiHash to convert
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* @param results the resultant byte array
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* @param max_length the maximum length of the byte array
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* @returns true(1) on success
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*/
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int from_multihash_to_byte_array(struct MultiHash* hash, unsigned char* results, size_t max_length) {
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// what size is needed?
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int required_size = hash->size + 2;
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if (required_size < max_length)
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return 0;
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results[0] = hash->fn_code;
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results[1] = hash->size;
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// now copy in the data
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for(int i = 0; i < hash->size; i++)
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results[i+2] = hash->data[i];
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return 1;
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}
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/***
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* public methods
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**/
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/***
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* retrieve the size element of the multihash object that is embedded in the base58 string
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* @param b58_string the base58 encoded string
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* @returns the size element of the MultiHash object
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*/
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size_t libp2p_multihash_b58_size(unsigned char* b58_string) {
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size_t byte_length = libp2p_crypto_encoding_base58_decode_max_size(b58_string);
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unsigned char bytes[byte_length];
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unsigned char* ptr = bytes;
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int retVal = libp2p_crypto_encoding_base58_decode(b58_string, strlen((char*)b58_string), &ptr, &byte_length);
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if (retVal == 0)
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return 0;
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return ptr[1];
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}
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/**
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* turns a multihash into a string of hex
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*/
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int libp2p_multihash_hex_string(struct MultiHash* hash, char* string, int max_length) {
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// calculate the size of the struct
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size_t struct_size = sizeof(char) * (hash->size + 2);
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// make sure we have enough space (2 bytes for each byte, plus terminating null
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if (max_length < (struct_size * 2))
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return 0;
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// put in the hex values
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char temp[3];
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sprintf(temp, "%02x", hash->fn_code);
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string[0] = temp[0];
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string[1] = temp[1];
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sprintf(temp, "%02x", hash->size);
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string[2] = temp[0];
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string[3] = temp[1];
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for(int i = 0; i < struct_size - 2; i++) {
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sprintf(temp, "%02x", hash->data[i]);
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string[(i*2) + 4] = temp[0];
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string[(i*2) + 5] = temp[1];
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}
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return 1;
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}
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/**
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* decodes a hex string into a multihash
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*/
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int libp2p_multihash_from_hex_string(char* string, int length, struct MultiHash* hash) {
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hash->fn_code = from_hex_to_char(&string[0]);
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hash->size = from_hex_to_char(&string[2]);
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for(int i = 0; i < hash->size; i++) {
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int pos = (i * 2) + 4;
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if (pos > length - 1)
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return 0;
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hash->data[i] = from_hex_to_char(&string[(i*2) + 4]);
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}
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return 1;
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}
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/**
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* turns a multihash into a b58 string
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* @param hash the Multihash to encode
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* @param binary_buffer the buffer to fill
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* @param max_length the size of the buffer
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* @returns true(1) on success
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*/
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int libp2p_multihash_to_b58(struct MultiHash* hash, unsigned char* binary_buffer, size_t max_length) {
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int bytes_length = hash->size + 2;
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unsigned char bytes[bytes_length];
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unsigned char* ptr = bytes;
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int retVal = from_multihash_to_byte_array(hash, bytes, bytes_length);
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if (retVal == 0)
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return 0;
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// finally encode the array into base64
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return libp2p_crypto_encoding_base58_encode(ptr, bytes_length, &binary_buffer, &max_length);
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}
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/**
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* turns a base58 encoded string into a MultiHash
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* @param b58_string the base58 encoded string
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* @param b58_string_length the length of the encoded string
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* @param hash the MultiHash to fill
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* @returns true(1) on success
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*/
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int libp2p_b58_to_multihash(unsigned char* b58_string, size_t b58_string_length, struct MultiHash* hash) {
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size_t buffer_size = libp2p_crypto_encoding_base58_decode_max_size(b58_string);
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unsigned char buffer[buffer_size];
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unsigned char* b = buffer;
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libp2p_crypto_encoding_base58_decode(b58_string, b58_string_length, &b, &buffer_size);
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// now build the hash
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hash->fn_code = b[0];
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hash->size = b[1];
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memcpy(hash->data, &b[2], hash->size);
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return 0;
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}
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