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hashing mechanism to hash an input (0 to 2^32 - 1) to a fixed possibly 12 character hash


hashing mechanism to hash an input (0 to 2^32 - 1) to a fixed possibly 12 character hash

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hashing mechanism to hash an input (0 to 2^32 - 1) to a fixed possibly 12 character hash
Tag : algorithm , By : user182203
Date : November 24 2020, 01:01 AM

With these it helps Using md5 and chopping off most of it is not a good idea, because there is no guarantee that you would get a unique cache. Besides, you have much easier alternatives available to you, because you have a lot more bits than you need.
Values in the range [0..232] need 32 bit (duh!). You have 12 printable characters, which give you 72 bits if you stay within Base-64 encoding range of characters. You don't even need that many characters - you can use three bits per character for the initial eight characters, and two bits per character for the last four digits. This way your 12 characters would stay in the range ['0'..'7'], and the last four would be in the range ['0'..'3']. Of course you are not bound to numeric digits - you could use letters for some groups of digits, to give it a more "randomized" appearance.

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Hashing a string for use in hash table (Double Hashing)


Tag : java , By : jamerson
Date : March 29 2020, 07:55 AM
Hope that helps So I see two things going on here
Using two different hashes and combining them in attempt to get a more distributed hash If a hash fails, trying a new spot a little farther along

Select statement with the hash (#) character, not Hash password?


Tag : php , By : Priyatna Harun
Date : March 29 2020, 07:55 AM
it should still fix some issue How can I select rows that contain a value that is not like a given expression?
select * from table where not (column1 like '%value1%')
select * from table1 where not (column1 like '%value1%' or column1 like '%value2%' or column1 like'%value3%')

sha256 hashing algorithm on objective c fails to create a hash that matches the hash generated on the server


Tag : objective-c , By : Fahad
Date : March 29 2020, 07:55 AM
Hope this helps Add an category to the NSData class with this function and use this instead of description. Also check the case of the hex strings between this string and the one on the server side.
-(NSString *)hexEncodedString
{
    unsigned char *bytes = (unsigned char*)[self bytes];    
    NSInteger length = [self length];
    NSMutableString *hexEncodedString = [NSMutableString string];
    for (int i = 0; i < length; i++)
    {
        [hexEncodedString appendFormat:@"%0.2x", bytes[i]];
    }
    return hexEncodedString;
}

Does ready two-way hash function for strings with fixed hash length exist in Java?


Tag : java , By : hyperNURb
Date : March 29 2020, 07:55 AM
I hope this helps you . I don't think such hash exists, regardless of the programming language.
Here is a quote from the hash function wikipedia page:
A hash function is any function that can be used to map data of arbitrary size to data of fixed size.

How to check if a hash key is present in the hash by matching any letter/number for a character {say X}


Tag : perl , By : marocchino
Date : March 29 2020, 07:55 AM
I hope this helps you . I have a hash, say "Identifier" with keys such as FACD,BDCD,DDSE,CDSD. I would like to search if the key "FXXD" is present in the hash "Identifier" by considering X to match any alphanumeric. In this scenario, it should come back with found as "FXXD" matches "FACD" considering X can be anything. , To select keys that satisfy a pattern
my @spec_keys = grep { /F..D/ } keys %identifier;
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