Hello guys!
I have a "RSA_verify_Signature" code,
When I give the public key with below sequence,it works fine:
byte pubkey[] ={0x30,0x5A,0x30,0x0D,0x06,0x09,0x2A,0x86,
0x48,0x86,0xF7,0x0D,0x01,0x01,0x01,0x05,0x00,0x03,0x49,0x00,
0x30,0x46,0x02,0x41,0x00,0xD1,0x8A,0x48,0xC0,0x60,0x56,0x27,
0x32,0x98,0xE4,0x3F,0xB4,0x43,0xF2,0xB9,0xF6,0xA2,0x75,0xF0,
0x42,0x17,0x07,0xD8,0x4E,0x9C,0x62,0x29,0x19,0xF6,0xE5,0xFB,
0xDA,0x49,0x6E,0x42,0x85,0xB1,0x1A,0xE3,0x1A,0x1B,0x24,0x7B,
0x0F,0xCD,0x5F,0x9E,0x3D,0xC1,0x1C,0x7C,0x26,0x06,0xA7,0x28,
0x88,0xED,0x87,0x2D,0xC7,0xB5,0x2A,0xDB,0x0F,0x02,0x01,0x11};
But I need to zero "n" & "e" parts in one section of my program (my
program needs Public key to be zero in a
section)
So, I decode it's sequence with "DumpASN.1" program available in
"http://lapo.it/asn1js/";!
and the result is as following:
305A300D06092A864886F70D01010105000349003046024100D18A48C06056273298E43FB443F2B9F6A275F0421707D84E9C622919F6E5FBDA496E4285B11AE31A1B247B0FCD5F9E3DC11C7C2606A72888ED872DC7B52ADB0F020111
SEQUENCE
Offset: 0
Length: 2+90
(constructed)
SEQUENCE
Offset: 2
Length: 2+13
(constructed)
OBJECT_IDENTIFIER
Offset: 4
Length: 2+9
Value:
1.2.840.113549.1.1.1
NULL
Offset: 15
Length: 2+0
BIT_STRING
Offset: 17
Length: 2+73
(encapsulates)
SEQUENCE
Offset: 20
Length: 2+70
(constructed)
INTEGER
Offset: 22
Length: 2+65
INTEGER
Offset: 89
Length: 2+1
Value:
17
Regarding this result,I found that should zero "n" and "e" in this
way:
For "n":
INTEGER
Offset: 22
Length: 2+65
For "e":
INTEGER
Offset: 89
Length: 2+1
Value:
17
byte pubkey[] =
{0x30,0x5A,0x30,0x0D,0x06,0x09,0x2A,0x86,0x48,0x86,0xF7,0x0D,
0x01,0x01,0x01,0x05,0x00,0x03,0x49,0x00,0x30,0x46,
0x02,0x41,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,
0x02,0x01,0x00};
But when I run my program,I see "run_time" error which is thrown to
this line of "cryptlib.h" file:
virtual void ThrowIfInvalid(RandomNumberGenerator &rng, unsigned int
level) const
{if (!Validate(rng, level)) throw InvalidMaterial("CryptoMaterial:
this object contains invalid values");}
Related to this line of the code:
StringSource( message, true, new Redirector(*verifierFilter));
Here is the code:
#include "stdafx.h"
#include "rsa.h"
#include "osrng.h" // PRNG
#include "hex.h" // Hex Encoder/Decoder
#include "files.h" // File Source and Sink
using namespace std;
using namespace CryptoPP;
int main(int argc, char* argv[])
{
/*byte pubkey[] ={0x30,0x5A,0x30,0x0D,0x06,0x09,0x2A,0x86,
0x48,0x86,0xF7,0x0D,0x01,0x01,0x01,0x05,0x00,0x03,0x49,0x00,
0x30,0x46,0x02,0x41,0x00,0xD1,0x8A,0x48,0xC0,0x60,0x56,0x27,
0x32,0x98,0xE4,0x3F,0xB4,0x43,0xF2,0xB9,0xF6,0xA2,0x75,0xF0,
0x42,0x17,0x07,0xD8,0x4E,0x9C,0x62,0x29,0x19,0xF6,0xE5,0xFB,
0xDA,0x49,0x6E,0x42,0x85,0xB1,0x1A,0xE3,0x1A,0x1B,0x24,0x7B,
0x0F,0xCD,0x5F,0x9E,0x3D,0xC1,0x1C,0x7C,0x26,0x06,0xA7,0x28,
0x88,0xED,0x87,0x2D,0xC7,0xB5,0x2A,0xDB,0x0F,0x02,0x01,0x11};*/
byte pubkey[] ={0x30,0x5A,0x30,0x0D,0x06,0x09,0x2A,0x86,
0x48,0x86,0xF7,0x0D,
0x01,0x01,0x01,0x05,0x00,0x03,0x49,0x00,0x30,0x46,
0x02,0x41,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,
0x02,0x01,0x00};
byte pbSignature[]= {0x17,0x26,0xA8,0x4F,0x87,0x9D,0x9D,0x3F,0x60,
0x98,0x92,0x75,0x3E,0xB2,0xF4,0x8B,0xA6,0xF6,0x47,0x09,0x71,
0xBD,0x5D,0x87,0x9E,0x52,0xED,0xB0,0x23,0x2D,0xA3,0xCE,0x43,
0xEE,0xD2,0xEC,0xD3,0x17,0x55,0x3A,0x37,0xCA,0x17,0xF7,0x2B,
0xB5,0x41,0x0C,0xA9,0x48,0x69,0x89,0xA6,0x72,0xB5,0x4F,0xB7,
0xD0,0x20,0xCC,0x2C,0x0E,0x1E,0x39};
// Message M
string message = "Yoda said, Do or Do Not. There is not try.";
//Verify signature
StringSource pubArray(pubkey,sizeof(pubkey), true,NULL);
StringSource SignatureArray( pbSignature,sizeof
(pbSignature),true,NULL);
// Verifier Object
RSASSA_PKCS1v15_SHA_Verifier pub(pubArray);
// Sanity Check
if (SignatureArray.MaxRetrievable() != pub.SignatureLength())
printf("error length:%d",(int)pub.SignatureLength());
SecByteBlock Signature( pub.SignatureLength() );
SignatureArray.Get( Signature, Signature.size());
// Prepare Verifier
VerifierFilter *verifierFilter =new VerifierFilter(pub);
verifierFilter->Put(Signature, pub.SignatureLength());
// Invoke Verifier
StringSource( message, true, new Redirector(*verifierFilter));
// Paydirt
if( false == verifierFilter->GetLastResult() )
printf("Signature Verification Failed");
else
printf("Signature Verified");
return 0;
}
And also when running, the value of "pub.SignatureLength()" is "1" !!!
Please help me about this problem?!!
How Could I zero the "n" & "e" parts as works?
And How about zeroing the Private Key? ("n" & "e" & "d" & "p" &
"q" ,...)
Thanks in Advance.
Gary
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