RSA公钥生成 – Swift

Azure密钥保险库发送e和n参数，这些参数等于RSA模数（ n ）和RSA公共指数（ e ）。 使用第三方库很容易创建，但没有模数和指数，输出值将无效。

我需要创建这两部分的RSA公钥。然后我必须创建RSA OAEP。 有谁遇到过类似的问题？ 知道怎么做到这一点？

我曾尝试使用SCZ-BasicEncodingRules-iOS ，但输出的代码不正确。

这是代码：

let moduleString: String = "mK-g0TLMqtefmosgBSTQi3dWh8h-rn4lQA8sQgNs_Gkf5TvgKWtYGJ4jRGUU-eK2bmyAAomVUojYBBlRYBkTRekm99DlD9T6U9yI3v11pZVl3yQgVXBEkiTZug3Inn_IAOGPQ3Q5OT6fEj1sRRxmMv93CQukQguSKuU4v2tmElgvyhg_eKIQbNx0JRCI4-1Z5GazxNjtwk7tWcA6PAbV0zZe2AaW0TlYVil_U8NckgHBguBoTHqVAbzb-MNa-HRa4QlBmdemcSaiDr5GikoOdmQ1-Lu6koqUkepx16pgqPvVw3o_NuXAZCS37c7bfgtXWTJcAIjiQaEyRcIV2bXsUQ" let exponent: String = "AQAB" let moduleData: NSData! = (moduleString as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData! let expData: NSData! = (exponent as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData! let arrayaaa: NSArray = [moduleData, expData] let key: NSData = arrayaaa.berData() 

Answer 1

所以，我找到了一个解决方案。 不幸的是， SCZ-BasicEncodingRules-iOS对iOS 8及更高版本的解码算法错误。 它输出带有错误前缀的密钥。

如果您遇到同样的问题，这里有一个帮助我的解决方案，但它是Objective-C代码。 原始来源 ：

  + (NSData *)generateRSAPublicKeyWithModulus:(NSData*)modulus exponent:(NSData*)exponent { const uint8_t DEFAULT_EXPONENT[] = {0x01, 0x00, 0x01,}; //default: 65537 const uint8_t UNSIGNED_FLAG_FOR_BYTE = 0x81; const uint8_t UNSIGNED_FLAG_FOR_BYTE2 = 0x82; const uint8_t UNSIGNED_FLAG_FOR_BIGNUM = 0x00; const uint8_t SEQUENCE_TAG = 0x30; const uint8_t INTEGER_TAG = 0x02; uint8_t* modulusBytes = (uint8_t*)[modulus bytes]; uint8_t* exponentBytes = (uint8_t*)(exponent == nil ? DEFAULT_EXPONENT : [exponent bytes]); //(1) calculate lengths //- length of modulus int lenMod = (int)[modulus length]; if(modulusBytes[0] >= 0x80) lenMod ++; //place for UNSIGNED_FLAG_FOR_BIGNUM int lenModHeader = 2 + (lenMod >= 0x80 ? 1 : 0) + (lenMod >= 0x0100 ? 1 : 0); //- length of exponent int lenExp = exponent == nil ? sizeof(DEFAULT_EXPONENT) : (int)[exponent length]; int lenExpHeader = 2; //- length of body int lenBody = lenModHeader + lenMod + lenExpHeader + lenExp; //- length of total int lenTotal = 2 + (lenBody >= 0x80 ? 1 : 0) + (lenBody >= 0x0100 ? 1 : 0) + lenBody; int index = 0; uint8_t* byteBuffer = malloc(sizeof(uint8_t) * lenTotal); memset(byteBuffer, 0x00, sizeof(uint8_t) * lenTotal); //(2) fill up byte buffer //- sequence tag byteBuffer[index ++] = SEQUENCE_TAG; //- total length if(lenBody >= 0x80) byteBuffer[index ++] = (lenBody >= 0x0100 ? UNSIGNED_FLAG_FOR_BYTE2 : UNSIGNED_FLAG_FOR_BYTE); if(lenBody >= 0x0100) { byteBuffer[index ++] = (uint8_t)(lenBody / 0x0100); byteBuffer[index ++] = lenBody % 0x0100; } else byteBuffer[index ++] = lenBody; //- integer tag byteBuffer[index ++] = INTEGER_TAG; //- modulus length if(lenMod >= 0x80) byteBuffer[index ++] = (lenMod >= 0x0100 ? UNSIGNED_FLAG_FOR_BYTE2 : UNSIGNED_FLAG_FOR_BYTE); if(lenMod >= 0x0100) { byteBuffer[index ++] = (int)(lenMod / 0x0100); byteBuffer[index ++] = lenMod % 0x0100; } else byteBuffer[index ++] = lenMod; //- modulus value if(modulusBytes[0] >= 0x80) byteBuffer[index ++] = UNSIGNED_FLAG_FOR_BIGNUM; memcpy(byteBuffer + index, modulusBytes, sizeof(uint8_t) * [modulus length]); index += [modulus length]; //- exponent length byteBuffer[index ++] = INTEGER_TAG; byteBuffer[index ++] = lenExp; //- exponent value memcpy(byteBuffer + index, exponentBytes, sizeof(uint8_t) * lenExp); index += lenExp; if(index != lenTotal) NSLog(@"lengths mismatch: index = %d, lenTotal = %d", index, lenTotal); NSMutableData* buffer = [NSMutableData dataWithBytes:byteBuffer length:lenTotal]; free(byteBuffer); return buffer; } 

此算法与标准Java KeyFactory生成类匹配。