6.1TPM架构 家北大学 5 Northeastern University SHA-1 Engine A SHA-1 message digest engine is used for computing signatures,creating key Blobs and for general purpose use. ●HMAC engine Computes the HMAC digest authDigest resulting from a secret and arbitrary data >authDigest-HMAC(secret,data) Mainly used in TPM's authentication protocols >provides two pieces of information to the TPM:proof of knowledge of the authorization data and proof that the request arriving is authorized and has no modifications made to the command in transit. >See OSAP/OlAPprotocols6.1 TPM 架构 ⚫ SHA-1 Engine ❖ A SHA-1 message digest engine is used for computing signatures, creating key Blobs and for general purpose use. ⚫ HMAC engine ❖ Computes the HMAC digest authDigest resulting from a secret and arbitrary data ➢authDigest←HMAC( secret, data) ❖ Mainly used in TPM’s authentication protocols ➢provides two pieces of information to the TPM: proof of knowledge of the authorization data and proof that the request arriving is authorized and has no modifications made to the command in transit. ➢See OSAP/OIAP protocols