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May 08, 2016 Simplest easiest method to access find key hash in windows step by step tutorial for beginners. The key hash is a type of simple authenticate key generate by your android development enviournment which will authenticate our developed android application ( In which we are going to add Facebook login ) and gives us the access to use Facebook login into our app. The secret is only used to make the generator. Currently the 'account family' feature is mostly unused and only the first (index 0) private/public key is used. The generator takes the index of the key desired, and loops with an additional sub-index until it finds a valid key using it's hashing as described on the wiki. – dchapes May 6 '14 at. Concatentate the users name and the secret key and hash with (for example) SHA1; Unpack the SHA1 hash as an alphanumeric string. This is the individual user's 'Product Key' Within the program, do the same hash, and compare with the product key. If equal, OK. Yes, you can also generate the Key Hash using the SHA1 of your project. Key Hash is nothing new it is just the encoded format of your unique SHA1 which Facebook prefers. If you are using the Debug SHA1 then this Key Hash will become the Debug Key Hash and if you are using the Release SHA1 then it will become the Release Key Hash.

Jul 08, 2015 Facebook uses the key hash to authenticate interactions between your app and the Facebook app. If you run apps that use Facebook Login, you need to add your Android development key hash to your Facebook developer profile. This article share the process of generating a key hash for Facebook integration with android using openssl. Mar 09, 2018  How to Generating a Development Key Hash Facebook andree23. Unsubscribe from andree23? Get Android key hash to Facebook - Duration: 4:34. PL Rik 17,267 views.

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AndroidApps/ApplicationsMobile Development

This example demonstrates about How to create Android Facebook Key Hash

Generating a Development Key Hash

Mac OS:- Execute below command in terminal keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore openssl sha1 -binary openssl base64

Windows:- Execute below command in command prompt keytool -exportcert -alias androiddebugkey -keystore 'C:UsersUSERNAME.androiddebug.keystore' 'PATH_TO_OPENSSL_LIBRARYbinopenssl' sha1 -binary 'PATH_TO_OPENSSL_LIBRARYbinopenssl' base64

Generating a Release Key Hash

keytool -exportcert -alias YOUR_RELEASE_KEY_ALIAS -keystore YOUR_RELEASE_KEY_PATH openssl sha1 -binary openssl base64

Click here to download the project code.

26 Jun 2019CPOL

Introduction

Hashing is the transformation process of value into a usually shorter fixed-length key/value that represents the original value. A few days ago, we had to use hash comparison to sync data between two systems via API (obviously, it wasn't the most efficient way to use API for data syncing, but we had no option to add any change at source end).

Background

What we were doing:

  1. Creating a hash string at our end after object JSON deserialization
  2. Comparing that hash string with an existing DB row by a unique identifier (Primary key)
    1. If no row found by the unique identifier (Primary key), adding a new row to the DB
    2. If the hash string wasn't the same, updating the existing row with new values
  3. And few other sync log processes

Everything was working as expected until we refactored the existing code (changed name of a few models and properties). The hash string was being generated from the entire object (including all the values) rather than considering specific properties. The way we were creating the hash string was actually wrong. Let's check a few hash string examples.

Hash Helper Class

This is the utility class to manage hash related operations.

Consideration

  • Using MD5 hash Hash(byte[] value)
  • Any null value is considered as 'null' string Byte(object value)

Object to Hash String Process

  1. Create bytes of that object Byte(object value)
  2. Create hash bytes from the object bytes Hash(byte[] value)
  3. String from hash bytes String(byte[] hash)

A Combined Hash of Multiple Objects

  1. Create bytes of each object Byte(object value)
  2. Combine or sum the bytes Combine(params byte[][] values)
  3. Create hash bytes from the combine or sum the bytes Hash(byte[] value)
  4. String from hash bytes String(byte[] hash)

Alternatively:

  1. Create combined hash bytes Hash(params object[] values)
  2. String from hash bytes String(byte[] hash)

Methods We Are Going to Use More Frequently

Generating A Development Key Hash Recipe

  • Create a hash string of any string HashString(string value, Encoding encoding = null)
  • Create hash/combine hash string of any/group of object HashString(params object[] values)

Hash of Entire Object

The data class or model:

Creating a hash of the model:

Important to Remember

This hash depends on both object structures and assigned values. The generated hash will not be the same even if we assign the same values to the properties, but added some changes like:

  • Class/Model name change
  • Property name change
  • Namespace name change
  • Property Number change (add or remove any property)

to the model. And in a development environment, refactoring can take place any time.

Hash of Data Values

Generating A Development Key Hash In Cmd

Let's make a hash using only values. Creating an interface IHash.

Using IHash to a model and using hash helper inside the method HashString().

This way, the model structure is not taking part in the hash generation process, only specific property values (Name, IsActive, CreatedDateTime) are being considered.

Hash will remain the same until no new value has been set to any of those properties. Any structural change (name change, property add/remove, etc.) to the model will not affect the hash string.

Hash Result

Other Tests

Working fine with null object values:

We will not be able to create the entire People class as it is not using [Serializable]:

BONUS: String Hash

It is quite common to create a password/string hash. So here we have it.

Conclusion

  • If we have to compare considering values or specific values only, then using Hash of Data Values is the best option.
  • But if we need to compare both object structure and values altogether, go for Hash of Entire Object.

References

Generating A Development Key Hashtag

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Bytes

Generating A Development Key Hash Video

Hash Bytes

Combined Bytes

Bytes to String

Limitations

I haven't considered all possible worst scenarios or code may throw unexpected errors for untested inputs. If any, just let me know.

Find Visual Studio 2017 console application sample code as attachment.

Create Hash Key

History

  • 26th June, 2019: Initial version

Generating A Development Key Hash Company