[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[OAuth 1.0 Server · OpenBankProject/OBP-API Wiki]]
([TIME[2015-03-06 08:47:32 +09:00]] 版)
<https://github.com/OpenBankProject/OBP-API/wiki/OAuth-1.0-Server>
]FIGCAPTION]

>  The Open Bank Project OAuth server support "SHA1" and "SHA256" so the parameter MUST be set to “HMAC-SHA1" or “HMAC-SHA256”

]FIG]


[FIG(quote)[
[FIGCAPTION[
[2] [CITE@en[OAuth 1.0 Server · OpenBankProject/OBP-API Wiki]]
([TIME[2015-03-06 08:48:40 +09:00]] 版)
<https://github.com/OpenBankProject/OBP-API/wiki/OAuth-1.0-Server>
]FIGCAPTION]

> The Open Bank Project OAuth 1.0 implementation uses the “HMAC-SHA1” and “HMAC-SHA256” as signing methods. The key to sign the base string is the concatenation of the consumer secret and the token secret with the “&” character in the middle like this: oauth_consumer_secret&oauth_token_secret, in the first step the application does not have yet a token so it will be an empty string.
> The signature that results from the signature process MUST be encoded in base 64 also since the protocol requires encoding all the OAuth parameters.

]FIG]


[FIG(quote)[
[FIGCAPTION[
[3] [CITE@ja[PHP: 定義済み定数 - Manual]]
([TIME[2015-03-12 13:17:35 +09:00]] 版)
<http://php.net/manual/ja/oauth.constants.php>
]FIGCAPTION]

> OAUTH_SIG_METHOD_HMACSHA256 (string)
> OAuth HMAC-SHA256 署名方式。

]FIG]