CryptoPPI

Overview

This PEIM provides a PPI (PEI-to-PEI Interface) for cryptographic operations during the PEI phase. It implements RSA key generation/signing/verification (including RSA-PSS and RSA-OAEP padding schemes), X.509 certificate parsing, PKCS7 signature verification, ASN.1 DER encoding/decoding, SHA-1 hashing, big-number arithmetic with Montgomery reduction, cryptographic random number generation, and key derivation. It includes an internal memory manager (Mmgr) for heap allocation within the constrained PEI environment.

Key Functions

• MmgrInitHeap / MmgrAllocPointer / MmgrFreePointer -- Internal PEI heap manager
• BnAlloc / BnFree / BnCompare -- Big number arithmetic primitives
• BnMontSqr / IntnMontReduce -- Montgomery multiplication/reduction
• IntnMultiply / IntnMod / IntnShiftLeft -- Core big integer math
• RSA signing, verification, encryption, decryption routines
• X.509 / PKCS7 / ASN.1 DER parsing functions

Dependencies

• PiPei.h (UEFI PEI protocol headers)
• AmiCrypto.h (AMI Crypto PPI protocol definition)
• edk2 DebugLib, BaseMemoryLib, MemoryAllocationLib

Platform

• Architecture: IA32 (32-bit)
• Machine type: x86 (0x014C)
• Subsystem: EFI Boot Service Driver (0x000B)
• Format: PE32
• Sections: .text (51KB), .rdata (18KB), .data, .reloc