View source for Wallet Import Format (WIF)

Wallet Import Format (WIF, also known as Wallet Export Format) is a way of encoding a private ECDSA key to make it easier to copy.

A testing suite is available for encoding and decoding of WIF at:

http://gobittest.appspot.com/PrivateKey

==Private key to WIF==
1 - Take a private key
    0C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
2 - Add a 0x80 byte in front of it for mainnet addresses or 0xef for testnet addresses. Also add a 0x01 byte at the end if the private key will correspond to a compressed public key
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
3 - Perform SHA-256 hash on the extended key
    8147786C4D15106333BF278D71DADAF1079EF2D2440A4DDE37D747DED5403592
4 - Perform SHA-256 hash on result of SHA-256 hash
    507A5B8DFED0FC6FE8801743720CEDEC06AA5C6FCA72B07C49964492FB98A714
5 - Take the first 4 bytes of the second SHA-256 hash, this is the [[checksum]]
    507A5B8D
6 - Add the 4 checksum bytes from point 5 at the end of the extended key from point 2
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D507A5B8D
7 - Convert the result from a byte string into a base58 string using [[Base58Check encoding]]. This is the Wallet Import Format
    5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ

==WIF to private key==
1 - Take a Wallet Import Format string
    5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ
2 - Convert it to a byte string using [[Base58Check encoding]]
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D507A5B8D
3 - Drop the last 4 checksum bytes from the byte string
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
4 - Drop the first byte (it should be 0x80). If the private key corresponded to a compressed public key, also drop the last byte (it should be 0x01). If it corresponded to a compressed public key, the WIF string will have started with K or L instead of 5 (or c instead of 9 on testnet). This is the private key.
    0C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D

==WIF checksum checking==
1 - Take the Wallet Import Format string
    5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ
2 - Convert it to a byte string using [[Base58Check encoding]]
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D507A5B8D
3 - Drop the last 4 checksum bytes from the byte string
    800C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D
3 - Perform SHA-256 hash on the shortened string
    8147786C4D15106333BF278D71DADAF1079EF2D2440A4DDE37D747DED5403592
4 - Perform SHA-256 hash on result of SHA-256 hash
    507A5B8DFED0FC6FE8801743720CEDEC06AA5C6FCA72B07C49964492FB98A714
5 - Take the first 4 bytes of the second SHA-256 hash, this is the checksum
    507A5B8D
6 - Make sure it is the same, as the last 4 bytes from point 2
    507A5B8D
7 - If they are, and the byte string from point 2 starts with 0x80 (0xef for testnet addresses), then there is no error.