RSA公钥生成 - Swift [英] RSA public key generation -- Swift
本文介绍了RSA公钥生成 - Swift的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Azure键库发送 e 和 n 参数，这些参数等于RSA模数（ n ）和RSA public exponent（ e < STRONG>）。使用第三方库可以轻松创建，但输出值不会在没有模数和指数的情况下生效。
我需要创建这两个部分的RSA公钥。我必须创建RSA OAEP。
有没有人遇到类似的问题？任何想法如何实现？
我已尝试使用 SCZ- BasicEncodingRules-iOS ，但是输出的代码不正确。
这里是代码：
让moduleString：字符串= MK-g0TLMqtefmosgBSTQi3dWh8h-rn4lQA8sQgNs_Gkf5TvgKWtYGJ4jRGUU-eK2bmyAAomVUojYBBlRYBkTRekm99DlD9T6U9yI3v11pZVl3yQgVXBEkiTZug3Inn_IAOGPQ3Q5OT6fEj1sRRxmMv93CQukQguSKuU4v2tmElgvyhg_eKIQbNx0JRCI4-1Z5GazxNjtwk7tWcA6PAbV0zZe2AaW0TlYVil_U8NckgHBguBoTHqVAbzb-MNA-HRa4QlBmdemcSaiDr5GikoOdmQ1-Lu6koqUkepx16pgqPvVw3o_NuXAZCS37c7bfgtXWTJcAIjiQaEyRcIV2bXsUQ
设指数：字符串= AQAB
让moduleData：NSData！ =（moduleString
as NSString）.dataUsingEncoding（NSUTF8StringEncoding）as NSData！
让expData：NSData！ =（指数
作为NSString）.dataUsingEncoding（NSUTF8StringEncoding）as NSData！
let arrayaaa：NSArray = [moduleData，expData]
let key：NSData = arrayaaa.berData（）
解决方案
所以，我找到了一个解决方案。不幸的是，对于iOS 8及更高版本，SCZ-BasicEncodingRules-iOS 具有错误的解码算法。它输出的密钥具有不正确的前缀。
如果你面临同样的问题，这里是一个帮助我的解决方案，但它是 Objective-C 码。 原始来源：
$ b $ （NSData *）模数指数：（NSData *）指数{
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 * modesBytes =（uint8_t *）[模数字节];
uint8_t * exponentBytes =（uint8_t *）（exponent == nil？DEFAULT_EXPONENT：[exponent bytes]）;
//（1）计算长度
// - 模块长度
int lenMod =（int）[模数长度];
if（modulusBytes [0]> = 0x80）
lenMod ++; //位置为UNSIGNED_FLAG_FOR_BIGNUM
int lenModHeader = 2 +（lenMod> = 0x80？1：0）+（lenMod> = 0x0100？1：0）;
// - 指数长度
int lenExp = exponent == nil？ sizeof（DEFAULT_EXPONENT）：（int）[exponent length];
int lenExpHeader = 2;
// - 身体长度
int lenBody = lenModHeader + lenMod + lenExpHeader + lenExp;
// - 总长度
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）填充字节缓冲区
// - 序列标签
byteBuffer [index ++] = SEQUENCE_TAG;
// - 总长度
如果（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;
// - 模数长度
如果（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;
// - 模数值
if（modulusBytes [0]> = 0x80）
byteBuffer [index ++] = UNSIGNED_FLAG_FOR_BIGNUM;
memcpy（byteBuffer + index，modulusBytes，sizeof（uint8_t）* [模数长度]）;
index + = [模数长度];
// - 指数长度
byteBuffer [index ++] = INTEGER_TAG;
byteBuffer [index ++] = lenExp;
// - 指数值
memcpy（byteBuffer + index，exponentBytes，sizeof（uint8_t）* lenExp）;
index + = lenExp;
if（index！= lenTotal）
NSLog（@length mismatch：index =％d，lenTotal =％d，index，lenTotal）;
NSMutableData * buffer = [NSMutableData dataWithBytes：byteBuffer length：lenTotal];
free（byteBuffer）;
返回缓冲区;
}
该算法与标准Java KeyFactory 生成类匹配。
Azure key vault sends e and n parameters which equals RSA modulus(n) and RSA public exponent(e). It's easy to create with 3rd party libraries, but output value wouldn't be valid without modulus and exponent.
I need to create RSA public key of these two parts.Then I have to create RSA OAEP. Has anyone encountered a similar problem? Any idea how to achieve this?
I have tried to use SCZ-BasicEncodingRules-iOS, but it output incorrect code.
Here is code:
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()
解决方案
So, I have found a solution. Unfortunately SCZ-BasicEncodingRules-iOS has wrong decoding algorithm for iOS 8 and above. It outputs key with incorrect prefix.
If you faced with the same issue, here is a solution that helped me, but it's Objective-C code. Original source:
+ (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;
}
This algorithm matches with standard Java KeyFactory generation class.
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