1*e7b1675dSTing-Kang Chang# Python digital signature example 2*e7b1675dSTing-Kang Chang 3*e7b1675dSTing-Kang ChangThis example shows how to sign and verify data with Tink using digital 4*e7b1675dSTing-Kang Changsignatures. 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 ECDSA_P256 --out-format JSON \ 13*e7b1675dSTing-Kang Chang --out signature_test_private_keyset.json 14*e7b1675dSTing-Kang Chang$ tinkey create-public-keyset --in signature_test_private_keyset.json \ 15*e7b1675dSTing-Kang Chang --in-format JSON --out-format JSON --out signature_test_public_keyset.json 16*e7b1675dSTing-Kang Chang``` 17*e7b1675dSTing-Kang Chang 18*e7b1675dSTing-Kang Chang## Build and run 19*e7b1675dSTing-Kang Chang 20*e7b1675dSTing-Kang Chang### Bazel 21*e7b1675dSTing-Kang Chang 22*e7b1675dSTing-Kang ChangBuild the examples: 23*e7b1675dSTing-Kang Chang 24*e7b1675dSTing-Kang Chang```shell 25*e7b1675dSTing-Kang Chang$ git clone https://github.com/google/tink 26*e7b1675dSTing-Kang Chang$ cd tink/python/examples 27*e7b1675dSTing-Kang Chang$ bazel build ... 28*e7b1675dSTing-Kang Chang``` 29*e7b1675dSTing-Kang Chang 30*e7b1675dSTing-Kang ChangGenerate a signature: 31*e7b1675dSTing-Kang Chang 32*e7b1675dSTing-Kang Chang```shell 33*e7b1675dSTing-Kang Chang$ echo "some data" > data.txt 34*e7b1675dSTing-Kang Chang$ touch signature_file.txt 35*e7b1675dSTing-Kang Chang 36*e7b1675dSTing-Kang Chang$ ./bazel-bin/signature/signature --mode sign \ 37*e7b1675dSTing-Kang Chang --keyset_path ./signature/signature_test_private_keyset.json \ 38*e7b1675dSTing-Kang Chang --data_path data.txt --signature_path signature_file.txt 39*e7b1675dSTing-Kang Chang``` 40*e7b1675dSTing-Kang Chang 41*e7b1675dSTing-Kang ChangVerify a signature: 42*e7b1675dSTing-Kang Chang 43*e7b1675dSTing-Kang Chang```shell 44*e7b1675dSTing-Kang Chang$ ./bazel-bin/signature/signature --mode verify \ 45*e7b1675dSTing-Kang Chang --keyset_path ./signature/signature_test_public_keyset.json \ 46*e7b1675dSTing-Kang Chang --data_path data.txt --signature_path signature_file.txt 47*e7b1675dSTing-Kang Chang``` 48