| % Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| % use this file except in compliance with the License. You may obtain a copy of |
| % the License at |
| % |
| % http://www.apache.org/licenses/LICENSE-2.0 |
| % |
| % Unless required by applicable law or agreed to in writing, software |
| % distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| % WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| % License for the specific language governing permissions and limitations under |
| % the License. |
| |
| -module(couch_crypto). |
| |
| -export([hash/2, hash_init/1, hash_update/3, hash_final/2]). |
| -export([hmac/3]). |
| |
| -compile([nowarn_deprecated_function]). |
| |
| hash(Alg, Data) -> |
| case {Alg, erlang:function_exported(crypto, hash, 2)} of |
| {_, true} -> |
| crypto:hash(Alg, Data); |
| {sha, false} -> |
| crypto:sha(Data); |
| {md5, false} -> |
| crypto:md5(Data); |
| {Alg, false} -> |
| throw({unsupported, Alg}) |
| end. |
| |
| hash_init(Alg) -> |
| case {Alg, erlang:function_exported(crypto, hash_init, 1)} of |
| {_, true} -> |
| crypto:hash_init(Alg); |
| {sha, false} -> |
| crypto:sha_init(); |
| {md5, false} -> |
| crypto:md5_init(); |
| {Alg, false} -> |
| throw({unsupported, Alg}) |
| end. |
| |
| |
| hash_update(Alg, Context, Data) -> |
| case {Alg, erlang:function_exported(crypto, hash_update, 2)} of |
| {_, true} -> |
| crypto:hash_update(Context, Data); |
| {sha, false} -> |
| crypto:sha_update(Context, Data); |
| {md5, false} -> |
| crypto:md5_update(Context, Data); |
| {Alg, false} -> |
| throw({unsupported, Alg}) |
| end. |
| |
| |
| hash_final(Alg, Context) -> |
| case {Alg, erlang:function_exported(crypto, hash_final, 1)} of |
| {_, true} -> |
| crypto:hash_final(Context); |
| {sha, false} -> |
| crypto:sha_final(Context); |
| {md5, false} -> |
| crypto:md5_final(Context); |
| {Alg, false} -> |
| throw({unsupported, Alg}) |
| end. |
| |
| |
| hmac(Alg, Key, Data) -> |
| case {Alg, erlang:function_exported(crypto, hmac, 3)} of |
| {_, true} -> |
| crypto:hmac(Alg, Key, Data); |
| {sha, false} -> |
| crypto:sha_mac(Key, Data); |
| {Alg, false} -> |
| throw({unsupported, Alg}) |
| end. |