Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>After several days of research finally i did it with OpenSSL. I'm not an expert in C++ so i'm not certainly sure if all chars, const chars and unsigned chars are declared correctly, so if anyone has a better idea please edit it =). You must have lybcrypto.a and libssl.a (here you can find them <a href="https://github.com/x2on/OpenSSL-for-iPhone" rel="nofollow">https://github.com/x2on/OpenSSL-for-iPhone</a>). I tested several times with EMV VISA keys and it works.</p> <pre><code>#include &lt;openssl/opensslv.h&gt; #include &lt;openssl/rsa.h&gt; #include &lt;openssl/evp.h&gt; #include &lt;openssl/bn.h&gt; @implementation ViewController -(NSData*) decryptIPKC:(NSString*)ipkc modulus:(NSString*)mod exponent:(NSString*)exp{ NSString * hexString = ipkc; int hexStringLength= [hexString length] / 2; //unsigned char enc_bin[144]; unsigned char dec_bin[hexStringLength]; //int enc_len; int dec_len; RSA * rsa_pub = RSA_new(); const char *N=[mod UTF8String] ; const char *E=[exp UTF8String]; char * myBuffer = (char *)malloc((int)[hexString length] / 2 + 1); bzero(myBuffer, [hexString length] / 2 + 1); for (int i = 0; i &lt; [hexString length] - 1; i += 2) { unsigned int anInt; NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)]; NSScanner * scanner = [[NSScanner alloc] initWithString:hexCharStr]; [scanner scanHexInt:&amp;anInt]; myBuffer[i / 2] = (char)anInt; } printf("Mybuffer: %s",myBuffer); if (!BN_hex2bn(&amp;rsa_pub-&gt;n, N)) { printf("NO CARGO EL MODULO"); } printf(" N: %s\n", N); printf(" n: %s\n", BN_bn2hex(rsa_pub-&gt;n)); if (!BN_hex2bn(&amp;rsa_pub-&gt;e, E)) { printf("NO CARGO EL EXPONENTE"); } printf(" E: %s\n", E); printf(" e: %s\n", BN_bn2hex(rsa_pub-&gt;e)); printf("public key size : %d bits\n", RSA_size(rsa_pub)); /* decrypt */ if ((dec_len = RSA_public_decrypt(hexStringLength, (unsigned char*)myBuffer, dec_bin, rsa_pub,RSA_NO_PADDING))&lt;0) { printf("NO\n "); } printf("decrypted data:\n %s", dec_bin); print_hex(dec_bin, dec_len); NSData* data = [NSData dataWithBytes:dec_bin length:sizeof(dec_bin)]; free(myBuffer); return data; } - (void)viewDidLoad { [super viewDidLoad]; NSString *m= @"Your HEX modulus here"; NSString *e=@"Your HEX exponent"; NSString * hexString= @"Your HEX message here"; NSData *decryptedIPKC= [self decryptIPKC:hexString modulus:m exponent:e]; NSLog(@"ESTE ES EL NSDATA %@", decryptedIPKC.description); } @end </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POGenerate RSA Public key from modulus and exponent in bytes in Objective-c
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USCarlos Mayoral
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COHi I am getting crash in this line - printf("decrypted data:\n %s", dec_bin); & print_hex(dec_bin, dec_len); - this line gives me error in execution. any other library I need to include for print_hex?? please help me out. If possible please share your code my email id - meshram.nitesh@gmail.com
      singulars
      1. PO
      1. USNitesh Meshram
    2. COPost some code to see it and maybe i could help you
      singulars
      1. PO
      1. USCarlos Mayoral
    3. COHi now this code is working for me very nice. I need your one more help. I am getting correct output at this line printf("Mybuffer: %s",myBuffer); but when I am trying to convert "decryptedIPKC" in string I am not getting null . here is my code NSString* newStr = [NSString stringWithUTF8String:[decryptedIPKC bytes]];. Thank you
      singulars
      1. PO
      1. USNitesh Meshram
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload