attest: Use ECDH+SHA+AES over RSA as TEE pub key

At present, there are performance limitations when using the Rust RSA
crate with no_std. There is also a desire for EC key
encryption/decryption. As such, replace the usage of RSA keys with EC
keys.

The initial implementation uses ECDH384+SHA256+AES128 symmetric
encryption.

Signed-off-by: Tyler Fanelli <[email protected]>

Cargo.toml

@@ -43,30 +43,30 @@ libaproxy = { path = "libaproxy" }
 syscall = { path = "syscall" }
 packit = { path = "packit" }
 userlib = { path = "user/lib" }
-userinit = { path = "user/init" }
 
 # crates.io
+aes = "0.8.4"
 aes-gcm = { version = "0.10.3", default-features = false }
 arbitrary = "1.3.0"
 base64 = { version = "0.22.1", default-features = false, features = ["alloc"] }
 bitfield-struct = "0.6.2"
 bitflags = "2.4"
 clap = { version = "4.4.14", default-features = false }
+elliptic-curve = { version = "0.13.8", features = ["jwk"] }
 gdbstub = { version = "0.6.6", default-features = false }
 gdbstub_arch = { version = "0.2.4" }
 igvm = { version = "0.3.2", default-features = false }
 igvm_defs = { version = "0.3.2", default-features = false }
 intrusive-collections = "0.9.6"
-kbs-types = { version = "0.8.0", default-features = false, features = ["alloc"] }
+kbs-types = { version = "0.9.1", default-features = false, features = ["alloc"] }
 libfuzzer-sys = "0.4"
 log = "0.4.17"
-p384 = { version = "0.13.0" }
+p384 = { version = "0.13.0", default-features = false, features = ["alloc", "arithmetic", "ecdh", "jwk"] }
 rand_chacha = { version = "0.3.1", default-features = false }
 rdrand = { version = "0.8.3", default-features = false }
-rsa = { version = "0.9.6", default-features = false }
 serde = { version = "1.0.215", default-features = false, features = ["alloc", "derive"] }
 serde_json = { version = "1.0", default-features = false, features = ["alloc"] }
-sha2 = { version = "0.9.2", default-features = false, features = ["force-soft"] }
+sha2 = { version = "0.10.8", default-features = false, features = ["force-soft"] }
 uuid = "1.6.1"
 # Add the derive feature by default because all crates use it.
 zerocopy = { version = "0.8.2", features = ["derive"] }