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General question about your modified uECC library.

chainkit/Crypto/uECC.c

Lines 2810 to 2838 in aee9a63

    
           int uECC_sign_forbc(const uint8_t private_key[uECC_BYTES], 
        
                         const uint8_t message_hash[uECC_BYTES], 
        
                               uint8_t signature[uECC_BYTES*2]){ 
        
               uECC_word_t s[uECC_WORDS]; 
        
               uECC_word_t r[uECC_WORDS]; 
        
               uECC_word_t s3[uECC_WORDS]; 
        
               vli_set(s3, curve_n); 
        
               vli_rshift1(s3); 
        
               int i = 0; 
        
               while(i<2000){ 
        
                   if(!uECC_sign(private_key, message_hash, signature)){ 
        
                       continue; 
        
                   } 
        
                   vli_bytesToNative(r, signature); 
        
                   vli_bytesToNative(s, signature+uECC_BYTES); 
        
                   if(vli_cmp(s, s3)>=0){ 
        
                       vli_modSub(s, curve_n, s, curve_n); 
        
                       vli_nativeToBytes(signature+uECC_BYTES, s); 
        
                   } 
        
                   if(vli_numBits(r, uECC_WORDS)<256 && vli_numBits(s, uECC_WORDS)<256 && vli_numBits(r, uECC_WORDS)>248 && vli_numBits(s, uECC_WORDS) > 248){ 
        
                       return getRecId(private_key, message_hash, signature); 
        
                   } 
        
                   i++; 
        
               } 
        
               return -1; 
        
           }

Hi, I apologize if this this is out of line, but I've been playing around trying to understand EOS and crypto in general and I'm at the stage of trying to create / sign transaction and push to the block chain. Im using what looks like the same ecc library that you have here. uECC (micro-ecc), but I've noticed that you have added a few extra functions one being uECC_sign_forbc(. So my question is, will I need to do something similar or can I sign an EOS transaction using the already present uECC_sign( function. Im a swift developer so I have the micro-ecc library pulled into my swift project.

Any insight much appreciated :)

Thanks,
Jacob

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	int uECC_sign_forbc(const uint8_t private_key[uECC_BYTES],
	const uint8_t message_hash[uECC_BYTES],
	uint8_t signature[uECC_BYTES*2]){
	uECC_word_t s[uECC_WORDS];
	uECC_word_t r[uECC_WORDS];

	uECC_word_t s3[uECC_WORDS];
	vli_set(s3, curve_n);
	vli_rshift1(s3);
	int i = 0;
	while(i<2000){
	if(!uECC_sign(private_key, message_hash, signature)){
	continue;
	}
	vli_bytesToNative(r, signature);
	vli_bytesToNative(s, signature+uECC_BYTES);

	if(vli_cmp(s, s3)>=0){
	vli_modSub(s, curve_n, s, curve_n);
	vli_nativeToBytes(signature+uECC_BYTES, s);
	}
	if(vli_numBits(r, uECC_WORDS)<256 && vli_numBits(s, uECC_WORDS)<256 && vli_numBits(r, uECC_WORDS)>248 && vli_numBits(s, uECC_WORDS) > 248){
	return getRecId(private_key, message_hash, signature);
	}
	i++;

	}
	return -1;
	}