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How to Extract Bitcoin Wallet Information from wallet.dat File: A Comprehensive Guide
Introduction:
Cryptocurrency enthusiasts understand the importance of managing their Bitcoin wallet data effectively. In this comprehensive tutorial, we will explore how to work with a wallet.dat file using a C program. You will learn how to open a Bitcoin wallet, extract key information, and search for specific Bitcoin addresses within the wallet. Whether you're a beginner or an experienced cryptocurrency user, this guide will provide valuable insights into managing your Bitcoin assets.
Table of Contents:
1. Prerequisites
2. Understanding the Code
3. Opening a Bitcoin Wallet
4. Extracting Wallet Data
5. Searching for Bitcoin Addresses
6. Running the Program
7. Conclusion
<div data-xf-p="1"><br class="Apple-interchange-newline">#include <sys/types.h> #include <limits.h> #include <stdlib.h> #include <stdio.h> #include <db.h> #include <string.h> #include <time.h> #include <unistd.h> #include <openssl/buffer.h> #include <openssl/ecdsa.h> #include <openssl/sha.h> #include <openssl/ripemd.h> #include <openssl/evp.h> DB *open_wallet(char *path){ DB *dbp; int ret; if ((ret = db_create(&dbp, NULL, 0)) != 0) { fprintf(stderr, "db_create: %s\n", db_strerror(ret)); exit (1); } if ((ret = dbp->open( dbp, NULL, path, "main", DB_BTREE, DB_RDONLY, 0664)) != 0) { dbp->err(dbp, ret, "%s", path); printf("fail open\n"); exit (1); } return dbp; } unsigned int get_size(FILE *f){ int magic; unsigned char byte1=0; unsigned char byte2=0; unsigned char byte3=0; unsigned char byte4=0; unsigned int size; magic=fgetc(f); if(magic<253){ byte1=magic; } else if(magic==253){ byte1=fgetc(f); byte2=fgetc(f); } else if(magic==254){ byte1=fgetc(f); byte2=fgetc(f); byte3=fgetc(f); byte4=fgetc(f); } else{ exit(1); } size=((unsigned int) byte4 << 24) + ((unsigned int) byte3 << 16) | ((unsigned int) byte2 << 8) | (unsigned int) byte1; return size; } char *get_string(FILE *f){ unsigned int size=get_size(f); char *buffer=(char *) malloc(size+1); fread(buffer,size,1,f); buffer[size]=0; return buffer; } char* reverse_string(char* str) { int end= strlen(str)-1; int start = 0; while( start<end ) { str[start] ^= str[end]; str[end] ^= str[start]; str[start]^= str[end]; ++start; --end; } return str; } char *sha256(char *string,int length) { unsigned char *digest=(unsigned char *) malloc(SHA256_DIGEST_LENGTH); SHA256_CTX sha256; SHA256_Init(&sha256); SHA256_Update(&sha256, string, length); SHA256_Final(digest, &sha256); return digest; } char *double_sha256(char *string, int length){ unsigned char *digest1=sha256(string,length); unsigned char *digest2=sha256(digest1,SHA256_DIGEST_LENGTH); free(digest1); return digest2; } char *ripemd160(char *string,int length) { unsigned char *digest=(unsigned char *) malloc(RIPEMD160_DIGEST_LENGTH); RIPEMD160_CTX ripe; RIPEMD160_Init(&ripe); RIPEMD160_Update(&ripe, string, length); RIPEMD160_Final(digest, &ripe); return digest; } static const char base58str[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; /* Convert checksummed 160 bit hash into 34 char base58 bitcoin address */ char * addr_encode(unsigned char hash160[25]) { static char addr[34+1]; int i, j; for (i=0; i<sizeof(addr); i++) addr = 0; for (j=0; j<25; j++) { unsigned carry, rslt; /* Multiply addr by 256 */ carry = 0; for (i=sizeof(addr)-2; i>=0; i--) { rslt = addr*256 + carry; addr = rslt % 58; carry = rslt / 58; } /* Add 8 bits from hash */ carry = hash160[j]; for (i=sizeof(addr)-2; i>=0 && carry!=0; i--) { rslt = addr + carry; addr = rslt % 58; carry = rslt / 58; } } /* Convert to char set */ for (i=0; i<sizeof(addr)-1; i++) addr = base58str[addr]; return addr; } char *public_key_to_bc_address(char *key, int length){ char *digest1=sha256(key,length); char *digest2=ripemd160(digest1,SHA256_DIGEST_LENGTH); size_t result_size; char *result; char *b58; char *checksum; char *final=malloc(RIPEMD160_DIGEST_LENGTH+5); /* +1 byte for version, +4 bytes for checksum) */ final[0]=0x00; /* version 0 */ memcpy(final+1,digest2,RIPEMD160_DIGEST_LENGTH); checksum=double_sha256(final,RIPEMD160_DIGEST_LENGTH+1); memcpy(&final[RIPEMD160_DIGEST_LENGTH+1],checksum,4); free(digest1); free(digest2); free(checksum); b58=(char *) malloc(35); memcpy(b58, addr_encode(final), 35); free(final); return b58; } void export_key(const unsigned char *key, int length, int private){ EC_KEY* pkey=EC_KEY_new(); EVP_PKEY *pubkey=EVP_PKEY_new(); EC_GROUP *group = EC_GROUP_new_by_curve_name(NID_secp256k1); EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE); EC_GROUP_set_point_conversion_form(group, POINT_CONVERSION_UNCOMPRESSED); EC_KEY_set_group(pkey,group); BIO *out=BIO_new(BIO_s_file()); BIO_set_fp(out,stdout,BIO_NOCLOSE); if(private){ PEM_write_bio_ECPKParameters(out, group); if(!d2i_ECPrivateKey(&pkey, &key, length)){ printf("failed to make key\n"); exit(1); } PEM_write_bio_ECPrivateKey(out,pkey,NULL,NULL,0,NULL,NULL); } else{ o2i_ECPublicKey(&pkey, &key, length); EVP_PKEY_assign_EC_KEY(pubkey,pkey); PEM_write_bio_PUBKEY(out, pubkey); } } void find_key(DBT *key, DBT *value, void *data){ char *address=(char *) data; FILE *key_stream=fmemopen(key->data,key->size,"r"); FILE *value_stream=fmemopen(value->data,value->size,"r"); char *type; char *b58; char *public_key; int public_key_length; char *private_key; int private_key_length; int found_key=0; type=get_string(key_stream); if(strcmp("key",type)==0){ public_key_length=get_size(key_stream); public_key=(char *) malloc(public_key_length); private_key_length=get_size(value_stream); private_key=(char *) malloc(private_key_length); fread(public_key,1,public_key_length,key_stream); fread(private_key,1,private_key_length,value_stream); found_key=1; } if(found_key){ b58=public_key_to_bc_address(public_key,public_key_length); if(strcmp(b58,address)==0){ export_key(private_key,private_key_length,1); export_key(public_key,public_key_length,0); exit(0); } if(strcmp("ALL",address)==0){ printf("%s\n", b58); export_key(private_key,private_key_length,1); } free(public_key); free(private_key); free(b58); } free(type); fclose(key_stream); fclose(value_stream); } void display(DBT *key, DBT *value, void *data){ char *address=(char *) data; FILE *key_stream=fmemopen(key->data,key->size,"r"); FILE *value_stream=fmemopen(value->data,value->size,"r"); char *type; type=get_string(key_stream); if(strcmp("key",type)==0){ char *public_key; int public_key_length; char *private_key; int private_key_length; char *b58; public_key_length=get_size(key_stream); public_key=(char *) malloc(public_key_length); private_key_length=get_size(value_stream); private_key=(char *) malloc(private_key_length); fread(public_key,1,public_key_length,key_stream); fread(private_key,1,private_key_length,value_stream); b58=public_key_to_bc_address(public_key,public_key_length); printf("%s %s\n", type, b58); free(public_key); free(private_key); free(b58); } else if(strcmp("acc",type)==0){ char *aname=get_string(key_stream); printf("%s %s\n", type, aname); free(aname); } else if(strcmp("acentry",type)==0){ char *aname=get_string(key_stream); printf("%s %s\n", type, aname); free(aname); } else if(strcmp("name",type)==0){ char *name=get_string(key_stream); char *value=get_string(value_stream); printf("%s %s %s\n", type, name, value); free(name); free(value); } else if(strcmp("setting",type)==0){ int c; char *setting=get_string(key_stream); printf("%s %s ", type, setting); while((c=fgetc(value_stream)) != EOF) printf("%02x", c); printf("\n"); free(setting); } else if(strcmp("version",type)==0){ unsigned version; fread(&version,1,4,value_stream); printf("%s %d\n", type, version); } else if(strcmp("defaultkey",type)==0){ char *public_key; int public_key_length; char *b58; public_key_length=get_size(value_stream); public_key=(char *) malloc(public_key_length); fread(public_key,1,public_key_length,value_stream); b58=public_key_to_bc_address(public_key,public_key_length); printf("%s %s\n", type, b58); free(public_key); free(b58); } else if(strcmp("pool",type)==0){ unsigned indx; unsigned indxhi; unsigned version; unsigned date; unsigned datehi; struct tm *tm; char *public_key; int public_key_length; char *b58; fread(&indx,1,4,key_stream); fread(&indxhi,1,4,key_stream); fread(&version,1,4,value_stream); fread(&date,1,4,value_stream); fread(&datehi,1,4,value_stream); tm=localtime((time_t*)&date); public_key_length=get_size(value_stream); public_key=(char *) malloc(public_key_length); fread(public_key,1,public_key_length,value_stream); b58=public_key_to_bc_address(public_key,public_key_length); printf("%s %08x %4d/%02d/%02d %s\n", type, indx, tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, b58); free(public_key); free(b58); } else { int c; printf("%s ", type); while((c=fgetc(key_stream)) != EOF) printf("%02x", c); printf("\n"); } free(type); fclose(key_stream); fclose(value_stream); } void foreach_item(DB *db, void func(DBT *, DBT *,void *), void *data){ DBC *cursor; DBT key, value; int ret; if ((ret = db->cursor(db, NULL, &cursor, 0)) != 0) { db->err(db, ret, "DB->cursor"); exit(1); } memset(&key, 0, sizeof(key)); memset(&value, 0, sizeof(value)); while ((ret = cursor->get(cursor, &key, &value, DB_NEXT)) == 0){ func(&key,&value,data); } if (ret != DB_NOTFOUND) { db->err(db, ret, "DBcursor->get"); exit(1); } } void print_usage(char *here){ printf("Usage:\n"); printf("%s BITCOIN_ADDRESS /path/to/wallet.dat\n",here); printf("%s ANY /path/to/wallet.dat\n",here); printf("%s EVERYTHING /path/to/wallet.dat\n",here); printf("%s 1qZGQG5Ls66oBbtLt3wPMa6zfq7CJ7f12 /home/dirtyfilthy/.bitcoin/wallet.dat\n",here); } int main(int argc, char *argv[]){ DB *wallet; ENGINE_load_builtin_engines(); CRYPTO_malloc_init(); if(argc!=3){ print_usage(argv[0]); exit(1); } wallet=open_wallet(argv[2]); if(strcmp(argv[1],"EVERYTHING")==0) foreach_item(wallet,display,NULL); else foreach_item(wallet,find_key,argv[1]); }</div>
1. Prerequisites:
- Basic understanding of C programming.
- A wallet.dat file containing your Bitcoin wallet data.
- OpenSSL library installed on your system.
2. Understanding the Code:
- Begin by including essential header files and libraries for Bitcoin wallet manipulation.
- Functions like `open_wallet`, `get_size`, `get_string`, and others facilitate data extraction and manipulation.
- The `public_key_to_bc_address` function converts public keys into Bitcoin addresses.
- Exporting keys and displaying wallet data are also part of the program's functionalities.
3. Opening a Bitcoin Wallet:
- Utilize the `open_wallet` function to access the wallet.dat file.
- This function relies on the Berkeley DB library to manage Bitcoin wallet data.
4. Extracting Wallet Data:
- Functions like `get_size` and `get_string` enable data extraction from the wallet.dat file.
- The code includes methods to retrieve public and private keys, addresses, and other wallet-related information.
5. Searching for Bitcoin Addresses:
- The `find_key` function is designed to search for specific Bitcoin addresses within the wallet.
- You can specify the target address as a command-line argument.
- In case of a successful match, the corresponding private and public keys are exported.
6. Running the Program:
- Compile the program using a C compiler such as `gcc`, ensuring that OpenSSL is properly linked.
- Execute the program, providing the Bitcoin address and the path to your wallet.dat file as command-line arguments.
7. Conclusion:
- This tutorial has equipped you with the knowledge and tools necessary to manage your Bitcoin wallet.dat file effectively.
- By following the step-by-step instructions and leveraging the provided code, you can extract valuable information from your Bitcoin wallet and effortlessly search for specific Bitcoin addresses.
In conclusion, this tutorial empowers cryptocurrency enthusiasts to take control of their Bitcoin assets by efficiently working with wallet.dat files. Whether you're interested in extracting keys or searching for specific addresses, this guide has you covered. Start managing your Bitcoin wallet with confidence today!