How to Create SeckeyRef from exponent and modulus of Public key and use in SecKeyEncrypt method

Question

Anyone please help in Creating SecKeyRef from Exponent and Modulus being my Public exponent = 010001 and Public Modulus

Answer 1

solved the problem NSData *publicTag=[self PublicKeyItems]; in Generating keypair and calling the method
try importing BasicEncodingRules.h and .m in your file

- (NSData *)PublicKeyItems
{
NSString *exp = @"010001";
NSLog(@"Publickeyexp -%@",exp);
NSData *publickeyexpdata= [self stringasdata:exp];
NSLog(@"publickeyexpdata = %@",publickeyexpdata);
NSString *mod = @"008903fb6d15f352ed3b45add3216f632f7139954a5631337aba7d645ed38482e3a810b4db26aab4d1df58c147230f0c75631a3dd0554b50de44e79f4fcf205c89fd3f80e0ff8d16c2e9f56ed3ab177953d54c9c30357d04e677cedd9912906ef8a046d7b0185b7f2022a8e435b0c6ecaef93f089fc3aa3f3677550b5d842046c7";
NSLog(@"Publickeymod -%@",mod);
NSData *publickeymoddata= [self stringasdata:mod];
NSLog(@"publickeymod = %@",publickeyexpdata);

NSMutableArray *publicarray = [[NSMutableArray alloc] init];
[publicarray addObject:publickeyexpdata];
[publicarray addObject:publickeymoddata];
NSData *testData = [publicarray berData];
NSLog(@"testdata = %@",testData);
NSMutableArray *testArray2 = [testData berDecode];
NSLog(@"testarray = %@",testArray2);
//STAssertEqualObjects(testArray, testArray2,
                    // @"Big items decode failed");

NSData *testData2 = [testArray2 berData];
 NSLog(@"PublicKeyData using Publickeyitems = %@",testData2);
return testData2;
}
-(NSData *)stringasdata:(NSString *)command {
command = [command stringByReplacingOccurrencesOfString:@" " withString:@""];
command = [command stringByReplacingOccurrencesOfString:@"<" withString:@""];
command = [command stringByReplacingOccurrencesOfString:@">" withString:@""];
NSLog(@"command= %@",command);
NSMutableData *commandToSend= [[NSMutableData alloc] init]; unsigned char whole_byte;
int len = [command length];
int n = len/2;
char byte_chars[3] = {'\0','\0','\0'}; int i;
for (i=0; i < n; i++) {
    byte_chars[0] = [command characterAtIndex:i*2]; byte_chars[1] = [command         characterAtIndex:i*2+1]; whole_byte = strtol(byte_chars, NULL, 16); [commandToSend appendBytes:&whole_byte length:1];
}
// [commandToSend setLength:[commandToSend length]-1];
return commandToSend; 

}