Hi Albertobsd,

Thanks for your projects. Kindly add "keymultiplication" like "keydivision"

Thanks.

i tried dividing private key 2B (43) by 2 [03d528ecd9b696b54c907a9ed045447a79bb408ec39b68df504bb51f459bc3ffc9 -n 3 -d 2]

where the results are

./keydivision -p 03d528ecd9b696b54c907a9ed045447a79bb408ec39b68df504bb51f459bc3ffc9 -n 3 -d 2
inversemultiplier : 7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a1
0372032cac3177c280ceb3076d7f5104052413706c956ecf38acf410ada12473a6
0249f0c19658519bec46d379f05d5388bb3a97bb95fe366c636a6bd9b6e90eb946
02052b643cc9bfccf3b168fc7bf2f3fe6151598797641babf45e655e49c8937c66

what's happening can you please explain ?

Hello Alberto i'v been trying to use keydivision with an Input file but it seems to not work. The error i get doing it is in the title and the error i get with the compiler is this :

keydivision.c:167:5: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result]
167 | fgets(buffer_input,1024,INPUT);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
keydivision.c:206:6: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result]
206 | fgets(buffer_input,1024,INPUT);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gcc -O3 -o keymath keymath.c gmpecc.o util.o base58.o sha256.o rmd160.o -lgmp
rm *.o

Thank you !

Hi, thanks for your software!
How to make calculatefromkey read values from file?

I devide 62 bits pubkey to 32

And get this pubkeys:

03782e746d99acac63f8ef9fced1164cd55b20a28b1567ea34ce8dca4b0d890d40
03666b5737758ddeb7bb98a95432cb81c58e9931e32b4b54ffa3b72faec6c33ba6
03666b5737758ddeb7bb98a95432cb81c58e9931e32b4b54ffa3b72faec6c33ba6
03782e746d99acac63f8ef9fced1164cd55b0a28b1567ea34ce8dca4b0d890d40
03f231dc9ca5aa43b5bd96ad639b61a2348bf5918ca4a8ec79c9c4276deed78f8d

Result zero !! Nothin founded.

Albert, please help ?????

Regards.😭

is there a way to use keygen for generating bitcoin address from static hexadecimal private key ??

Posting the same comment i left on Youtube ! :D

Hello alberto ! I wanted to know if it is possible to do substraction with the public key the same way it work with keydivision.
Fore exemple instead of writing a line eache time i want to do a substraction with the result of the public key would it be possible to do like : ./keymath (publickey) - 1 -n (number of operations)
In short : Doing consecutive substraction or addition

Trying to build on Ubuntu 21.10 (gcc 11.2.0) produces the following error:

gcc -O3 -c bloom/bloom.c -o bloom.o
gcc -O3 -c sha256/sha256.c -o sha256.o
gcc -O3 -c base58/base58.c -o base58.o
gcc -O3 -c rmd160/rmd160.c -o rmd160.o
gcc -O3 -c xxhash/xxhash.c -o xxhash.o
gcc -O3 -c gmpecc.c -o gmpecc.o
gcc -O3 -c util.c -o util.o
gcc -O3 -o rehashaddress rehashaddress.c gmpecc.o util.o sha256.o base58.o rmd160.o -lgmp
/usr/bin/ld: gmpecc.o:(.bss+0x2020): multiple definition of `EC'; /tmp/ccEmWNB8.o:(.bss+0x2040): first defined here
/usr/bin/ld: gmpecc.o:(.bss+0x0): multiple definition of `DoublingG'; /tmp/ccEmWNB8.o:(.bss+0x20): first defined here
/usr/bin/ld: gmpecc.o:(.bss+0x2000): multiple definition of `G'; /tmp/ccEmWNB8.o:(.bss+0x2020): first defined here
collect2: error: ld returned 1 exit status

Any advice on how to fix this?

I'm trying to division in the terminal with a total of 1 million rows. When I try to use keymath multiple times, it usually gives an error after the 50th line.

xybelll@asus:~/ecctools$ ./keymath 033c095d0337632b3e82e57e26cdf287b333c4d9c91ace703d269b27ac48329168 / 2
Result: 020733d93ce1a17f3b2298f715c0f12de80de59b675b506f63521d6f21600cdb53

xybelll@asus:~/ecctools$ ./keymath 02ae0e41340c224a04d0f7cabaddaa9d2e24f1d4ec58c6bb522cb8fc3c8292edc1 - 1
Result: 028cbb8b587fde85ccf57ef572f32adb4afc4db86ac10bab724d679900e385dd9f

xybelll@asus:~/ecctools$ ./keymath 02ae0e41340c224a04d0f7cabaddaa9d2e24f1d4ec58c6bb522cb8fc3c8292edc1 / 2
ed346bab06d27e95e5ce1994e7773b2 - 1
Result: 0349a153d280c058b784b0aa9fe50103ed590a4d9706c45953c3b1768a6e499f67

xybelll@asus:~/ecctools$ ./keymath 02144cc68d301d96ee533d9691f581795cbe7876edee019778405610421b55712e - 1
Result: 02c26f5861e25805518eaba2945dae1c27b551d376d1830bd781031f44dde394d9

"ed346bab06d27e95e5ce1994e7773b2 - 1" I can't fix this mistake, and you never know when he'll make this type of mistake. Sometimes when I open 100 transactions in a row, this error happens once, sometimes it happens 3 different times.

How can I run multiple commands for 1 million lines?

Thanks...

Can you make it where it can do it from a file like this does https://github.com/albertobsd/ecctools#addr2rmd to address or rmd160.

I also notice you have https://github.com/albertobsd/ecctools#calculatefromkey and https://github.com/albertobsd/ecctools#calculatefrompublickey but both are the same

Hello Alberto,
Any suggestion about error that I'm get as response , please? Thnx in Advance...

~/ecctools$ sudo make
gcc -O3 -c bloom/bloom.c -o bloom.o
gcc -O3 -c sha256/sha256.c -o sha256.o
gcc -O3 -c base58/base58.c -o base58.o
gcc -O3 -c rmd160/rmd160.c -o rmd160.o
gcc -O3 -c xxhash/xxhash.c -o xxhash.o
gcc -O3 -c gmpecc.c -o gmpecc.o
gmpecc.c:1:10: fatal error: gmp.h: No such file or directory
1 | #include <gmp.h>
| ^~~~~~~
compilation terminated.
make: *** [Makefile:7: default] Error 1

Update:
I'm on Win WSL - so after install $ sudo apt install libcrypt-dh-gmp-perl
also received same error response after "make"

Hi alberto.
If i divided the pubkey and got the scalar number and find the new pubkey in keyhunt - how can i calculate the true privkey?

You should warn clearly that this implementation of ECC point multiplication is not secure at all regarding side-channel attacks (power, EM/RF emissions, memory read), and timing measurements. Depending of the bits of the scalar number (usually a private secret), the operations performed are very different.
https://github.com/albertobsd/ecctools/blob/main/gmpecc.c#L99

All the operations requiring this point multiplication are affected and are not secure. Public key computation (with keygen, or calculatefromkey) and sharedsecret ECDH.

This should not be used in any system in production, or securing a private key.

Good day.

Then I use keymath and modmath and devide for deviding for example 777 / 999 = 0.77777777777777777....7 inf. modmath and keymath genererate result not with minimum needed float numbers 0.77777777777777777(This will be named X) * 999 = 777.0, but with maximum nposible float number - 0.777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 ........7 (this will be named Y) * 999 = 777.0 and private / publick keys for X and Y are different !!!

How to use in calculus editable floats count in result ?
Bro, help plesse ?

Hi

Loock:
we have pubkey of this privkey - 0xfffffffffffffffffffffffff

./md 0xfffffffffffffffffffffffff / 0x4000000000000
Result: 80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f9b463c06987c4

./md 0x80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f9b463c06987c4 - 0x4000000000000
Result: 80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f5b463c06987c4

xman@localhost:~/ecctools$ ./md 0x80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f5b463c06987c4 x 0x4000000000000
Result: fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140

xman@localhost:~/ecctools$ ./md 1 - 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140

Result: 2 this is a privkey what belong to pubkey, what we will brute - privkey 2.

we was find orivkey 2, and now we recover this privkey
0xfffffffffffffffffffffffff

./md 1 - 2
Result: fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140

xman@localhost:~/ecctools$ ./md 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140 / 0x4000000000000
Result: 80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f5b463c06987c4

./md 0x80266a9dd3b03fffffffffffffffffff5d269cebf99579e8f2f9b463c06987c4 x 0x4000000000000 Result: fffffffffffffffffffffffff

succesfuly recovered.

why method not work with puzzle priv/pubkey ?
I try many times but not succesful.

????

Bro, good day or night ;)

Why resulted private key after dividing is bigger then a devided privkey ?

[email protected]:~/ecctools$ ./modmath 0x100000000000000000000000000000
0 / 30240
Result: 61cb720c761cb720c761cb720c761cb6a4811d64db34aaa77c3500a19c342
679

Ho to manipulate with keys for get result < then a
0x100000000000000000000000000000 ??

Thanks !

If you try to divide the key into a divisor of 66 characters, the program accepts this divisor as a public key.

mark@ubuntu:~/Desktop/ecctools2$ ./keymath 03cd0fdaf5f7503342a20861b15491de59ba31ffe554c42372e4d0926a318cee8e / 963092532556721731126452703333034206412304441762446377444048756866
[E] Some invalid bit in the publickey: 963092532556721731126452703333034206412304441762446377444048756866

Sometimes with this division it gives an error: "We don't know how to divide 2 publickeys, we need an escalar number"

$ make
gcc -O3 -c bloom/bloom.c -o bloom.o
gcc -O3 -c sha256/sha256.c -o sha256.o
gcc -O3 -c base58/base58.c -o base58.o
gcc -O3 -c rmd160/rmd160.c -o rmd160.o
gcc -O3 -c xxhash/xxhash.c -o xxhash.o
#gcc -O3 -c gmpecc.c -o gmpecc.o
gcc -O3 -c util.c -o util.o
gcc -O3 -o test_functions test_functions.c util.o
gcc -O3 -o rehashaddress rehashaddress.c gmpecc.c util.o sha256.o base58.o rmd160.o -lgmp
rehashaddress.c:41:10: fatal error: gmp.h: No such file or directory
41 | #include <gmp.h>
| ^~~~~~~
compilation terminated.
gmpecc.c:1:10: fatal error: gmp.h: No such file or directory
1 | #include <gmp.h>
| ^~~~~~~
compilation terminated.
make: *** [Makefile:10: default] Error 1

i am getting errors compiling keygen.c

keygen.c:152:66: warning: unknown conversion type character ‘\x0a’ in format [-Wformat=]
  152 |                                 fprintf(stderr,"OpenSSL error: %l\n",err);
      |                                                                  ^~
keygen.c:152:48: warning: too many arguments for format [-Wformat-extra-args]
  152 |                                 fprintf(stderr,"OpenSSL error: %l\n",err);
      |                                                ^~~~~~~~~~~~~~~~~~~~~
keygen.c:135:25: warning: ignoring return value of ‘fread’ declared with attribute ‘warn_unused_result’ [-Wunused-resul
]
  135 |                         fread(buffer_key,1,bytes,fd);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
keygen.c:145:25: warning: ignoring return value of ‘fread’ declared with attribute ‘warn_unused_result’ [-Wunused-resul
]
  145 |                         fread(buffer_key,1,bytes,fd);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
keygen.c:158:25: warning: ignoring return value of ‘getrandom’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  158 |                         getrandom(buffer_key,bytes,GRND_NONBLOCK);

I was change a N from order.SetBase16("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141") to 2^70

I divide 0xf56926f9ca9abc1065153d25383e80 / -1
Result: 20212ef8c52b3a842d0bc

but then I divide pubkey from

0xf56926f9ca9abc1065153d25383e80 - privkey;

pubkey ./calculatefromkey f56926f9ca9abc1065153d25383e80
privatekey: 0000000000000000000000000000000000f56926f9ca9abc1065153d25383e80
publickey compressed: 02470a635de37b909187e612e5aa853decbb9769416a2ecd055f990c1de501f66c

i gent NOT PUBKEY FROM 20212ef8c52b3a842d0bc

029304ae3d06058417730a717b15727f651188448742442c311a5af9a5b02aa73d

./calculatefromkey 20212ef8c52b3a842d0bc privatekey: 000000000000000000000000000000000000000000020212ef8c52b3a842d0bc
publickey compressed: 03193f6e2afc8e2a243239a25ec7c92807c07833bb66bcc63586ad1e1eadb79406
public address compressed 13HzVpWa3YDVW9sEUEoc9wvJeMCZoCeDYb
publickey uncompressed: 04193f6e2afc8e2a243239a25ec7c92807c07833bb66bcc63586ad1e1eadb794062bcf9a0987701 bd2d1068a024f17c0edfe5f3cf7f7c3df74c2b2989d693c4bd3
public address uncompressed 1Hja51B5T5a2zHCTswdANGPDxYcju1hRQF

./keymath 02470a635de37b909187e612e5aa853decbb9769416a2ecd055f990c1de501f66c / -1
Result: 029304ae3d06058417730a717b15727f651188448742442c311a5af9a5b02aa73d

bupkey are differents, but must be pub1 = pub2 !!!

how to resolve this ?

ASAP.

Thank You

Bro, then try calculate some more difficult for ex divide pubkey + multiply key to number + add to pubkey a number needs paste previous result(from 1, 2, 3 operation etc).

Can you add function for calculate many math operation then just one run ? For ex after publick key add MANY needed operation and calculate for ex:

./keymath 03a301697bdfcd704313ba48e51d567543f2a182031efd6915ddc07bbcc4e16070 / 4 , x 6 , + 1, /6 , + 10, x 3, / 8 etc ???

./modmath 1233456fffeeecc / 4 , x 6 , + 1, /6 , + 10, x 7,+4, / 1 etc ???
Please Bro ?

This function will be very helpful.

Please Bro ?

Thank You

Hi Alberto.

Key math is an arithmetic calculator for public keys, containing only four operations:

-addition
-subtraction
-multiplication by a scalar number
-division by a scalar number

It would be fantastic if we could do these operations "Key math" performed from the "input file.txt" and saved in "output файл.txt ". Let's say we specified one of the four operations (x / + - ) according to which the number "35" or another number will be calculated, then "Key math" we perform this operation with each line from the "output файл.txt ".

rehashaddress Support for entering password from text，So you can enter multiple passwords！
And the output can specify only print mode，Like below：
Address only
1QLJY8Ep5WWwwoxPFjhNaqWTo7CYUhCfn1
1BFpD2RWHH4byetSdxou5x4cjSioyDR4uc
Private key only
5141853d88d49186ca8de96107e64a1464469da20b1f18d5116fe94bb9c80d99
b62f7b4c940282aae1f3370c0c0cf9d47cf82e2f0d4e8f9fa9f3694d9afa8804
Compressed public key only
020f085d02b5a1230655f4acb00ce3fda60306f20d4260c7e0100c8378d916e778
02436850d41bcaddf94a149a74ae4f2f5c155f9e0f30ef6f788238171018b8bf62
Uncompressed public key only
040f085d02b5a1230655f4acb00ce3fda60306f20d4260c7e0100c8378d916e778430675ac64f252340764620f576dba0ed5ea5106304948949306ba78dec761a0
Print all
5141853d88d49186ca8de96107e64a1464469da20b1f18d5116fe94bb9c80d99
020f085d02b5a1230655f4acb00ce3fda60306f20d4260c7e0100c8378d916e778
1QLJY8Ep5WWwwoxPFjhNaqWTo7CYUhCfn1
040f085d02b5a1230655f4acb00ce3fda60306f20d4260c7e0100c8378d916e778430675ac64f252340764620f576dba0ed5ea5106304948949306ba78dec761a0
1BFpD2RWHH4byetSdxou5x4cjSioyDR4uc

Good afternoon.
did you run speed tests against the original openssl library and secp256k1?

hi @albertobsd !
Can you help me and explain one thing:
example
privkey 0x30a6e39807c92c3533dac2acd41452
pubkey of this privkey 02B5F5D0BF884267CC5B3D6BF5B185AD6CC8BF63704D2BD0951A41B2A1744EB39C
you see that this privkey is odd and it can be divide by 2 equals pubkey also can divide by 2
but when we 0x30a6e39807c92c3533dac2acd41452 / 2 = 0x185371cc03e4960000000000000000 == pubkey = 038C3D7D46F82B9287014A8E248A390760CB58E64DA570F2B6A67720FE41971A8C
and
02B5F5D0BF884267CC5B3D6BF5B185AD6CC8BF63704D2BD0951A41B2A1744EB39C / 2 = 02186bd8fc6ef3103226bc23637c6d13a75a4779ff041f771c71ea386b43d6b4d4

AS you see the pubkeys are differents? why? can you explain if you know. Thank you

Tell me how to use it. Command in the terminal. What should be in the file? Error - Segmentation fault.
./keydivision
-i file Input file, input file with public keys to be divided-o file
Output file, if you omit this option the out will go to the standar output

looking updates for input and output switches for files
example command could be...etc
./keymath -i in-pubkeys.txt -o output-pubkeys.txt / 2
./keymath -i in-pubkeys.txt -o output-pubkeys.txt x 64
looking your updates as early
thanks

same other commands if available for use input and output files will also helpfull for large pictures

gcc -O3 -c bloom/bloom.c -o bloom.o
gcc -O3 -c sha256/sha256.c -o sha256.o
gcc -O3 -c base58/base58.c -o base58.o
gcc -O3 -c rmd160/rmd160.c -o rmd160.o
gcc -O3 -c xxhash/xxhash.c -o xxhash.o
gcc -O3 -c gmpecc.c -o gmpecc.o
gmpecc.c:1:10: fatal error: gmp.h: No such file or directory
1 | #include <gmp.h>
| ^~~~~~~
compilation terminated.
make: *** [Makefile:7: default] Error 1

There are no good products in the software at the moment. For bip 39 (BIP32, bip44) and also there are no good bip38 recovery products (this is very necessary.)
If you have the interest and time, the community will owe you a debt.
Thanks for your time and your efforts.
I am not an expert in c but wrote bip 32.44 to work in python. This sparked interest in the community.
BIP 38 is interesting to me personally for restoring access to the wallet.
I will look forward to hearing from you. Your products are unique

65096165055322767407827196705577385603448405744130176747093794104152547598903 / 2
32548082527661383703913598352788692801724202872065088373546897052076273799451L
hex(32548082527661383703913598352788692801724202872065088373546897052076273799451)
'0x47f58fd70bfd4fb8f2ce893cbe246a6b9ac94b62c6866db80d886148f1bb911bL'
hex(65096165055322767407827196705577385603448405744130176747093794104152547598903)
'0x8feb1fae17fa9f71e59d12797c48d4d7359296c58d0cdb701b10c291e3772237L'
./keymath 03c07a83ec106864885542bee448da450c7fe2ee5e64db514d4a408cc51faa6edf / 2
Result: 025f64958b1d0b25c6015ce6f76fd7fd15af5f53327c1f16408991f8b4f0de7419, ?

Dera Alberto,please help me !
"bash: ./keysubtracter: No such file or directory" why?

please resolve ./modmath result to HEX and DEC

is that possible to add compress pubkey to ./modmath 10/2 result : DEC HEX Pubkey?

Hello, is this parameter responsible for division in the code?

if(FLAG_DIVISOR == 0 )	{
		mpz_init_set_ui(divisor,0);
	}
	mpz_init(inversemultiplier);
	mpz_invert(inversemultiplier,divisor,EC.n);
	gmp_printf("inversemultiplier : %Zx\n",inversemultiplier);
	if(str_output)	{
		OUTPUT = fopen(str_output,"a");
		if(OUTPUT == NULL)	{
			fprintf(stderr,"can't opent file %s\n",str_output);
			OUTPUT = stdout;
		}
	}
	else	{
		OUTPUT = stdout;
	}

I just want to change it, add multiplication and subtraction. But I can’t understand what exactly is responsible for the division. When I try to add multiplication, the output is just zeros.

Hi ./ modmath givinf result in HEX value...can you please make it in HEX and DEC or Can we able to choose weather its HEX or DEC please?