Openssl is not recognized as an internal or external command

Please follow these step, I hope your key working properly:

1. Step 1 You will need OpenSSL. You can download the binary from openssl-for-windows project on Google Code.

2. Step 2 Unzip the folder, then copy the path to the bin folder to the clipboard.

   For example, if the file is unzipped to the location C:\Users\gaurav\openssl-0.9.8k_WIN32, then copy the path C:\Users\gaurav\openssl-0.9.8k_WIN32\bin.

3. Step 3 Add the path to your system environment path. After your PATH environment variable is set, open the cmd and type this command:

   C:\>keytool -exportcert -alias androiddebugkey -keystore [path to debug.keystore] | openssl sha1 -binary | openssl base64
   

   Type your password when prompted. If the command works, then you will be shown a key.

Use the entire path, like this:

exportcert -alias androiddebugkey -keystore ~/.android
/debug.keystore | "C:\openssl\bin\openssl.exe" sha1 -binary | "C:\openssl\bin\op
enssl.exe" base64

It worked for me.

Well at the place of OpenSSL ... you have to put actually the path to your OpenSSL folder that you have downloaded. Your actual command should look like this:

keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | "C:\Users\abc\openssl\bin\openssl.exe" sha1 -binary | "C:\Users\abc\openssl\bin\openssl.exe" base64

Remember, the path that you will enter will be the path where you have installed the OpenSSL.

Edit:

you can download OpenSSL for windows 32 and 64 bit from the respective links below:

OpenSSL for 64 Bits

OpenSSL for 32 Bits