Authentication APIs

The Authentication APIs help you to ensure the following:

• Data has not been altered
• Data is not from an impostor

The Authentication APIs include:

• Calculate Hash (QC3CALHA, Qc3CalculateHash) uses a one-way hash function to produce a fixed-length output string from a variable-length input string.
• Calculate HMAC (QC3CALHM, Qc3CalculateHMAC) uses a one-way hash function and a secret shared key to produce an authentication value.
• Calculate MAC (QC3CALMA, Qc3CalculateMAC) produces a message authentication code.
• Calculate Signature (QC3CALSG, Qc3CalculateSignature) produces a digital signature by hashing the input data and encrypting the hash value using a public key algorithm (PKA).
• Verify Signature (QC3VFYSG, Qc3VerifySignature) verifies that a digital signature is correctly related to the input data.