Official Name: RSAValidate
BCALL Address: 801B
Raises a big integer to the 17th power.
- All registers
- 8100h: 130-byte area which the multiplication routine uses to store its result
- 8182h: 65-byte area used as the first argument to the multiplication routine
- 81C3h: 65-byte area used as the second argument to the multiplication routine
This BCALL takes a large integer pointed to by HL and raises it to the 17th power (modulo the current public key.) The OS uses this to decrypt RSA signatures, such as those used for certificate blocks.