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Updated entropy calculation to account for required characters

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This commit is contained in:
Michael Starke
2019-01-31 15:52:50 +01:00
parent ed0a57a607
commit a7469975ad
2 changed files with 38 additions and 11 deletions
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41
MacPass/NSString+MPPasswordCreation.m
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@@ -84,7 +84,7 @@ static NSString *mergeWithoutDuplicates(NSString* baseCharacters, NSString* cust
ensureOccurence:(BOOL)ensureOccurence
length:(NSUInteger)length {
if(ensureOccurence) {
length = MAX(length, [NSString minimumPasswordLengthWithCharacterSet:allowedCharacters customCharacters:customCharacters ensureOccurance:ensureOccurence]);
length = MAX(length, [NSString minimumPasswordLengthWithCharacterSet:allowedCharacters customCharacters:customCharacters ensureOccurance:ensureOccurence]);
}
NSMutableString *password = [NSMutableString stringWithCapacity:length];
NSString *characters = mergeWithoutDuplicates(
@@ -160,16 +160,39 @@ static NSString *mergeWithoutDuplicates(NSString* baseCharacters, NSString* cust
- (CGFloat)entropyWhithCharacterSet:(MPPasswordCharacterFlags)characterSet customCharacters:(NSString *)customCharacters ensureOccurance:(BOOL)ensureOccurance {
CGFloat passwordLength = self.composedCharacterLength;
CGFloat entropy = 0;
if(ensureOccurance) {
return 0;
}
else {
NSString *characters = nil;
characters = mergeWithoutDuplicates(allowedCharactersString(characterSet), customCharacters);
CGFloat alphabetCount = characters.composedCharacterLength;
CGFloat passwordLength = self.composedCharacterLength;
return passwordLength * ( log10(alphabetCount) / log10(2) );
CGLError alphabetCount = 0;
if(characterSet & MPPasswordCharactersLowerCase) {
alphabetCount = (CGFloat)characterClassMap()[@(MPPasswordCharactersLowerCase)].length;
entropy += log2(alphabetCount);
}
if(characterSet & MPPasswordCharactersUpperCase) {
alphabetCount = (CGFloat)characterClassMap()[@(MPPasswordCharactersUpperCase)].length;
entropy += log2(alphabetCount);
}
if(characterSet & MPPasswordCharactersNumbers) {
alphabetCount = (CGFloat)characterClassMap()[@(MPPasswordCharactersNumbers)].length;
entropy += log2(alphabetCount);
}
if(characterSet & MPPasswordCharactersSymbols){
alphabetCount = (CGFloat)characterClassMap()[@(MPPasswordCharactersSymbols)].length;
entropy += log2(alphabetCount);
}
if(customCharacters.composedCharacterLength > 0) {
entropy += log2(customCharacters.composedCharacterLength);
}
NSUInteger minLenght = [NSString minimumPasswordLengthWithCharacterSet:characterSet customCharacters:customCharacters ensureOccurance:ensureOccurance];
passwordLength -= minLenght;
}
NSString *characters = mergeWithoutDuplicates(allowedCharactersString(characterSet), customCharacters);
CGFloat alphabetCount = characters.composedCharacterLength;
entropy += passwordLength * log2(alphabetCount);
return entropy;
}
- (NSString *)shuffledString {