Maximum length for MD5 input output

Question

What is the maximum length of the string that can have md5 hashed  Or  If it has no limit  and if so what will be the max length of the md5 output value

User · Answer

You can have any length  but of course  there can be a memory issue on the computer if the String input is too long  The output is always 32 characters

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The length of the message is unlimited       Append Length      A 64-bit representation of b  the length of the message before the      padding bits were added  is appended to the result of the previous      step  In the unlikely event that b is greater than 2 64  then only      the low-order 64 bits of b are used     The hash is always 128 bits  If you encode it as a hexdecimal string you can encode 4 bits per character  giving 32 characters  MD5 is not encryption  You cannot in general  decrypt  an MD5 hash to get the original string    See more here

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MD5 processes an arbitrary-length message into a fixed-length output of 128 bits  typically represented as a sequence of 32 hexadecimal digits

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A 128-bit MD5 hash is represented as a sequence of 32 hexadecimal digits

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You may want to use SHA-1 instead of MD5  as MD5 is considered broken    You can read more about MD5 vulnerabilities in this Wikipedia article

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The algorithm has been designed to support arbitrary input length  I e you can compute hashes of big files like ISO of a DVD     If there is a limitation for the input it could come from the environment where the hash function is used  Let s say you want to compute a file and the environment has a MAX FILE limit   But the output string will be always the same  32 hex chars  128 bits

User · Answer

There is no limit to the input of md5 that I know of  Some implementations require the entire input to be loaded into memory before passing it into the md5 function  i e   the implementation acts on a block of memory  not on a stream   but this is not a limitation of the algorithm itself  The output is always 128 bits  Note that md5 is not an encryption algorithm  but a cryptographic hash  This means that you can use it to verify the integrity of a chunk of data  but you cannot reverse the hashing  Also note that md5 is considered broken  so you shouldn t use it for anything security-related  it s still fine to verify the integrity of downloaded files and such

[md5] Maximum length for MD5 input/output

Examples related to md5

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