我目前在两个平台上都使用AES128,代码来源于这个回答
注意:我稍微改变了代码,不使用IV是因为我认为它对我的应用程序来说过于复杂。
node.js:
var CryptoJS = require("crypto-js");
var crypto = require('crypto');
var password = "1234567890123456";
var salt = "gettingsaltyfoo!";
var hash = CryptoJS.SHA256(salt);
var key = CryptoJS.PBKDF2(password, hash, { keySize: 256/32, iterations: 1000 });
var algorithm = 'aes128';
console.log(key.toString(CryptoJS.enc.Base64));
function encrypt(text){
var cipher = crypto.createCipher(algorithm,key.toString(CryptoJS.enc.Base64));
var crypted = cipher.update(text,'utf8','hex');
crypted += cipher.final('hex');
return crypted;
}
function decrypt(text){
var decipher = crypto.createDecipher(algorithm,key.toString(CryptoJS.enc.Base64));
var dec = decipher.update(text,'hex','utf8');
dec += decipher.final('utf8');
return dec;
}
iOS:
#import <CommonCrypto/CommonCrypto.h>
NSString* password = @"1234567890123456";
NSString* salt = @"gettingsaltyfoo!";
-(NSString *)decrypt:(NSString*)encrypted64{
NSMutableData* hash = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
NSMutableData* key = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
CC_SHA256(salt.UTF8String, (CC_LONG)strlen(salt.UTF8String), hash.mutableBytes);
CCKeyDerivationPBKDF(kCCPBKDF2, password.UTF8String, strlen(password.UTF8String), hash.bytes, hash.length, kCCPRFHmacAlgSHA1, 1000, key.mutableBytes, key.length);
NSLog(@"Hash : %@",[hash base64EncodedStringWithOptions:0]);
NSLog(@"Key : %@",[key base64EncodedStringWithOptions:0]);
NSData* encryptedWithout64 = [[NSData alloc] initWithBase64EncodedString:encrypted64 options:0];
NSMutableData* decrypted = [NSMutableData dataWithLength:encryptedWithout64.length + kCCBlockSizeAES128];
size_t bytesDecrypted = 0;
CCCrypt(kCCDecrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
key.bytes,
key.length,
NULL,
encryptedWithout64.bytes, encryptedWithout64.length,
decrypted.mutableBytes, decrypted.length, &bytesDecrypted);
NSData* outputMessage = [NSMutableData dataWithBytes:decrypted.mutableBytes length:bytesDecrypted];
NSString* outputString = [[NSString alloc] initWithData:outputMessage encoding:NSUTF8StringEncoding];
NSLog(@"Decrypted : %@",outputString);
return outputString;
}
-(NSString *)encrypt:(NSString *)toEncrypt{
NSMutableData* hash = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
NSMutableData* key = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
CC_SHA256(salt.UTF8String, (CC_LONG)strlen(salt.UTF8String), hash.mutableBytes);
CCKeyDerivationPBKDF(kCCPBKDF2, password.UTF8String, strlen(password.UTF8String), hash.bytes, hash.length, kCCPRFHmacAlgSHA1, 1000, key.mutableBytes, key.length);
NSData* message = [toEncrypt dataUsingEncoding:NSUTF8StringEncoding];
NSMutableData* encrypted = [NSMutableData dataWithLength:message.length + kCCBlockSizeAES128];
size_t bytesEncrypted = 0;
CCCrypt(kCCEncrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding,
key.bytes,
key.length,
NULL,
message.bytes, message.length,
encrypted.mutableBytes, encrypted.length, &bytesEncrypted);
NSString* encrypted64 = [[NSMutableData dataWithBytes:encrypted.mutableBytes length:bytesEncrypted] base64EncodedStringWithOptions:0];
NSLog(@"Encrypted : %@",encrypted64);
return encrypted64;
}
我的问题:我这样硬编码盐可以吗?我正在尝试加密和解密密码(变量密码和NSString密码可能会被硬编码到某个东西中)。我在网上读到需要将盐与密码一起保存在我的数据库中。如果不能硬编码盐,那么我应该如何将其从iOS发送到node.js并保持盐的一致性?我的iOS请求是否应该像这样?
{
key:"someKeyGeneratedOnTheSpotWithRandomSalt",
password:"somePasswordGeneratedFromKey"
}
在我的后端中,通过从数据库中提取这些字段来检查密码?
{
key:"someKeyGeneratedWhenTheUserFirstSignedUp",
password:"somePasswordGeneratedFromTheOrginalKeyWhenUserFirstSignedUp"
}
然后使用从两种情况生成的密钥和密码解密两个密码?
或者硬编码盐值,例如用户名,这样每个用户的密钥都是相同的,这样可以吗?
基本上我对我的加密模型是否正确感到困惑。
感谢任何帮助。