rsa.h File Reference

DSi RSA functions. More...

#include <stddef.h>
#include <nds/ndstypes.h>

Data Structures
struct	swiRSAbuffers
	Struture that holds pointers to the RSA buffers. More...
struct	swiRSAHeapContext
	Context that holds information about the RSA heap. More...

Typedefs
typedef struct swiRSAbuffers	swiRSAbuffers_t
	Struture that holds pointers to the RSA buffers.
typedef struct swiRSAHeapContext	swiRSAHeapContext_t
	Context that holds information about the RSA heap.

Functions
int	swiRSADecrypt (swiRSAHeapContext_t *ctx, void *dst, const void *sig, const void *key)
	Decrypt signature and also remove padding.
int	swiRSADecryptPGP (swiRSAHeapContext_t *ctx, void *dst, const void *sig, const void *key)
	Decrypt signature and extract the SHA1 value from a OpenPGP header.
int	swiRSADecryptRAW (swiRSAHeapContext_t *ctx, swiRSAbuffers_t *rsabuffers, size_t *lenDst)
	Decrypt signature using the owner's public key and return the hash of the data that the signature belongs to. This function does not remove padding from the output data but leading 0x00 bytes are stripped.
int	swiRSAInitHeap (swiRSAHeapContext_t *ctx, void *heapStart, size_t heapSize)
	Initialize RSA Heap.

Detailed Description

DSi RSA functions.

Function Documentation

swiRSADecrypt()

int swiRSADecrypt	(	swiRSAHeapContext_t *	ctx,
		void *	dst,
		const void *	sig,
		const void *	key
	)

Decrypt signature and also remove padding.

Parameters

ctx	RSA Heap context
dst	Pointer to output buffer (should be 128 bytes).
sig	Pointer to signature buffer (should be 128 bytes).
key	Pointer to key buffer (should be 128 bytes).

Returns

1 if success, 0 if failed

swiRSADecryptPGP()

int swiRSADecryptPGP	(	swiRSAHeapContext_t *	ctx,
		void *	dst,
		const void *	sig,
		const void *	key
	)

Decrypt signature and extract the SHA1 value from a OpenPGP header.

Parameters

ctx	RSA Heap context
dst	Pointer to output buffer.
sig	Pointer to signature buffer.
key	Pointer to key buffer.

Returns

1 if success, 0 if failed

swiRSADecryptRAW()

int swiRSADecryptRAW	(	swiRSAHeapContext_t *	ctx,
		swiRSAbuffers_t *	rsabuffers,
		size_t *	lenDst
	)

Decrypt signature using the owner's public key and return the hash of the data that the signature belongs to. This function does not remove padding from the output data but leading 0x00 bytes are stripped.

Parameters

ctx	RSA Heap context
rsabuffers	Struct containing pointers to destination buffer, signature and public key to use.
lenDst	Pointer to memory where to store the length of the destination buffer.

Returns

1 if success, 0 if failed.

swiRSAInitHeap()

int swiRSAInitHeap	(	swiRSAHeapContext_t *	ctx,
		void *	heapStart,
		size_t	heapSize
	)

Initialize RSA Heap.

Parameters

ctx	12-byte heap information structure that gets set with heap start, heap end and heap length.
heapStart	Pointer to the start of the heap.
heapSize	Size of the heap in bytes (should be usually 4096).

Returns

1 if success, 0 if failed.