Monotone-Parent: 2fb9aaf01f9b4a29e3d49d6c35deaf48a4e57e9c
Monotone-Revision: 825d6255230167e6f80d8015a569afa6bdb4cb7d Monotone-Author: wsourdeau@inverse.ca Monotone-Date: 2012-04-16T15:24:16maint-2.0.2
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@ -1,5 +1,9 @@
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2012-04-16 Wolfgang Sourdeau <wsourdeau@inverse.ca>
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* SoObjects/SOGo/NSString+Utilities.m (-encryptWithKey:)
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(-decryptWithKey:): new methods providing symmetric encryption of
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strings.
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* Tests/Unit/SOGoTestRunner.m (-run): do not empty the pool after
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each test.
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@ -74,6 +74,11 @@
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- (NSUInteger) countOccurrencesOfString: (NSString *) substring;
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/* Those methods provide symmetric enc-/decryption via a XOR operation */
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- (NSString *) encryptWithKey: (NSString *) theKey;
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- (NSString *) decryptWithKey: (NSString *) theKey;
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@end
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#endif /* NSSTRING_URL_H */
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@ -35,6 +35,7 @@
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#import <NGExtensions/NSDictionary+misc.h>
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#import <NGExtensions/NSObject+Logs.h>
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#import <NGExtensions/NGBase64Coding.h>
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#import <NGMime/NGMimeHeaderFieldGenerator.h>
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#import <SBJson/SBJsonParser.h>
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@ -610,4 +611,85 @@ static int cssEscapingCount;
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return count;
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}
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- (NSString *) encryptWithKey: (NSString *) theKey
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{
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NSMutableData *encryptedPassword;
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NSMutableString *key;
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NSString *result;
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NSUInteger i, passLength, theKeyLength, keyLength;
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unichar p, k, e;
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if ([theKey length] > 0)
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{
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// The length of the key must be greater (or equal) than
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// the length of the password
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key = [NSMutableString string];
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keyLength = 0;
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passLength = [self length];
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theKeyLength = [theKey length];
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while (keyLength < passLength)
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{
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[key appendString: theKey];
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keyLength += theKeyLength;
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}
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encryptedPassword = [NSMutableData data];
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for (i = 0; i < passLength; i++)
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{
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p = [self characterAtIndex: i];
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k = [key characterAtIndex: i];
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e = p ^ k;
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[encryptedPassword appendBytes: (void *)&e length: 2];
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}
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result = [encryptedPassword stringByEncodingBase64];
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}
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else
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result = nil;
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return result;
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}
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- (NSString *) decryptWithKey: (NSString *) theKey
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{
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NSMutableString *result;
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NSMutableString *key;
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NSData *decoded;
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unichar *decryptedPassword;
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NSUInteger i, theKeyLength, keyLength, decodedLength;
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unichar p, k;
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if ([theKey length] > 0)
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{
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decoded = [self dataByDecodingBase64];
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decryptedPassword = (unichar *)[decoded bytes];
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// The length of the key must be greater (or equal) than
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// the length of the password
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key = [NSMutableString string];
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keyLength = 0;
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decodedLength = ([decoded length] / 2); /* 1 unichar = 2 bytes/char */
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theKeyLength = [theKey length];
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while (keyLength < decodedLength)
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{
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[key appendString: theKey];
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keyLength += theKeyLength;
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}
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result = [NSMutableString string];
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for (i = 0; i < decodedLength; i++)
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{
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k = [key characterAtIndex: i];
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p = decryptedPassword[i] ^ k;
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[result appendFormat: @"%C", p];
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}
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}
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else
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result = nil;
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return result;
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}
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@end
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@ -47,4 +47,27 @@
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failIf(count != 0);
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}
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- (void) test_encryptdecrypt
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{
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NSString *secret = @"this is a secret";
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NSString *password = @"qwerty";
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NSString *encresult, *decresult;
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encresult = [secret encryptWithKey: nil];
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failIf(encresult != nil);
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encresult = [secret encryptWithKey: @""];
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failIf(encresult != nil);
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encresult = [secret encryptWithKey: password];
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failIf(encresult == nil);
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decresult = [encresult decryptWithKey: nil];
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failIf(decresult != nil);
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decresult = [encresult decryptWithKey: @""];
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failIf(decresult != nil);
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decresult = [encresult decryptWithKey: password];
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failIf(![decresult isEqualToString: secret]);
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}
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@end
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