| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| crypto/sha256 | Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4. |
| encoding/hex | Package hex implements hexadecimal encoding and decoding. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/awslabs/smithy-go | |
| github.com/awslabs/smithy-go/middleware | |
| github.com/awslabs/smithy-go/transport/http | |
| io | Package io provides basic interfaces to I/O primitives. |