2. Double_fun_ctest_gf2m

2.1. Function description:

This demo shows the operation of ECC point doubling using projective coordinate formula for short-weierstrass curve in GF(2^m).

• Allocate enough memory space of SRAM used by internal logic during computation.

• Filling data to address of N, then configure & start INV_N0 operation.

• Filling data to address of RR, then configure & start MOD operation.

• Filling data to address of operand a & b for montgomery multiplication operation, then configure & start MontMult operation.

• Configure & start ECC point doubling for short-weierstrass curve.

• Waiting process done to compare the result with the golden data to check.

2.2. Main Configuration:

2.2.1. INV_N0 operation:

Operation code	Field	Data length	Reserved area size
OP_INV_N0	GF(2^m)	6 words	11 words per variable

Note

Operation code is OP_INV_N0, the operand is N.

2.2.2. MOD operation:

Operation code	Option	Field	Operand a length	Operand b length
OP_MOD	ordinary	GF(2^m)	13 words	6 words

Note

Operation code is OP_MOD, the operand a is RR, operand b is N.

2.2.3. MontMult operation:

Operation code	Type	Field
OP_MontMult	MM_MULT	GF(2^m)

Note

Operation code is OP_MontMult:

1. The operand a is A, operand b is RR, the result stored in A;

2. The operand a is B, operand b is RR, the result stored in B;

2.2.4. PDBL operation:

Operation code	Field	Gx length	Gy length	Gz length	Qx length	Qy length	Qz length
OP_GFP_PDBL	GF(2^m)	6 words	6 words	6 words	6 words	6 words	6 words

Note

Operation code is OP_GFP_PDBL:

1. The x-coordinate of the first input point is Gx, the y-coordinate of the first input point is Gy, the z-coordinate of the first input point is Gz;

2. The x-coordinate of the second input point is Qx, the y-coordinate of the second input point is Qy, the z-coordinate of the second input point is Qz.

2.3. Test result:

If the result is same as the standard data, then print pass, if not print fail.

2.4. IO connection:

None