The standard ECDSA verification algorithm is used when the signed string for the intermediate signing key signature is assembled. For ECv2 protocol, you need to iterate over all the signatures in intermediateSigningKey.signatures and try to validate each one with the non-expired Google signing keys in keys.json. If at least one signature validation works, consider the verification complete. Use the intermediateSigningKey.signedKey.keyValue later to verify the signedStringForMessageSignature. Google strongly recommends you use a cryptographic library that exists rather than your own verification code.
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The standard ECDSA verification algorithm is used when the signed string is assembled. The intermediateSigningKey.signedKey.keyValue verified in the previous step is used to verify the signedMessage. Google strongly recommends you use a cryptographic library that exists rather than your own verification code.
The Tink library expects your private key to be base64-encoded in PKCS #8 format. Use the following command to generate the private key in this format from the private key generated in the first step:
Replace PrivateKey1 with the appropriate private key value that associates with the registered public key value with Google from Prepare your keys and register with Google. You can add multiple other private key values later on when it requires you to Rotate keys with Google. The variables can be either a base64-encoded PKCS8 string or an ECPrivateKey object. For more information on how to produce a base64-encoded PKCS8 private key, see Prepare your keys and register with Google.
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