1*e7b1675dSTing-Kang Chang# Python MAC example 2*e7b1675dSTing-Kang Chang 3*e7b1675dSTing-Kang ChangThis example shows how to check the integrity of data using Message 4*e7b1675dSTing-Kang ChangAuthentication Code (MAC). 5*e7b1675dSTing-Kang Chang 6*e7b1675dSTing-Kang ChangIt demonstrates the basic steps of using Tink, namely loading key material, 7*e7b1675dSTing-Kang Changobtaining a primitive, and using the primitive to do crypto. 8*e7b1675dSTing-Kang Chang 9*e7b1675dSTing-Kang ChangThe key material was generated with: 10*e7b1675dSTing-Kang Chang 11*e7b1675dSTing-Kang Chang```shell 12*e7b1675dSTing-Kang Chang$ tinkey create-keyset --key-template HMAC_SHA256_256BITTAG --out-format JSON \ 13*e7b1675dSTing-Kang Chang --out mac_test_keyset.json 14*e7b1675dSTing-Kang Chang``` 15*e7b1675dSTing-Kang Chang 16*e7b1675dSTing-Kang Chang## Build and Run 17*e7b1675dSTing-Kang Chang 18*e7b1675dSTing-Kang Chang### Bazel 19*e7b1675dSTing-Kang Chang 20*e7b1675dSTing-Kang ChangBuild the examples: 21*e7b1675dSTing-Kang Chang 22*e7b1675dSTing-Kang Chang```shell 23*e7b1675dSTing-Kang Chang$ git clone https://github.com/google/tink 24*e7b1675dSTing-Kang Chang$ cd tink/python/examples 25*e7b1675dSTing-Kang Chang$ bazel build ... 26*e7b1675dSTing-Kang Chang``` 27*e7b1675dSTing-Kang Chang 28*e7b1675dSTing-Kang ChangCompute a MAC: 29*e7b1675dSTing-Kang Chang 30*e7b1675dSTing-Kang Chang```shell 31*e7b1675dSTing-Kang Chang$ echo "some data" > data.txt 32*e7b1675dSTing-Kang Chang$ touch mac_file.txt 33*e7b1675dSTing-Kang Chang$ ./bazel-bin/mac/mac --mode compute \ 34*e7b1675dSTing-Kang Chang --keyset_path ./mac/mac_test_keyset.json \ 35*e7b1675dSTing-Kang Chang --data_path data.txt --mac_path mac_file.txt 36*e7b1675dSTing-Kang Chang``` 37*e7b1675dSTing-Kang Chang 38*e7b1675dSTing-Kang ChangVerify a MAC: 39*e7b1675dSTing-Kang Chang 40*e7b1675dSTing-Kang Chang```shell 41*e7b1675dSTing-Kang Chang$ ./bazel-bin/mac/mac --mode verify \ 42*e7b1675dSTing-Kang Chang --keyset_path ./mac/mac_test_keyset.json \ 43*e7b1675dSTing-Kang Chang --data_path data.txt --mac_path mac_file.txt 44*e7b1675dSTing-Kang Chang``` 45