| /* Copyright lowRISC contributors. */ |
| /* Licensed under the Apache License, Version 2.0, see LICENSE for details. */ |
| /* SPDX-License-Identifier: Apache-2.0 */ |
| |
| |
| .section .text.start |
| |
| /** |
| * Standalone RSA 1024 decrypt |
| * |
| * Uses OTBN modexp bignum lib to decrypt the message from the .data segment |
| * in this file with the private key contained in .data segment of this file. |
| * |
| * Copies the decrypted message to wide registers for comparison (starting at |
| * w0). See comment at the end of the file for expected values. |
| */ |
| run_rsa_1024_dec: |
| /* Init all-zero register. */ |
| bn.xor w31, w31, w31 |
| |
| /* Load number of limbs. */ |
| li x30, 4 |
| |
| /* Load pointers to modulus and Montgomery constant buffers. */ |
| la x16, modulus |
| la x17, m0inv |
| la x18, RR |
| |
| /* Compute Montgomery constants. */ |
| jal x1, modload |
| |
| /* Run exponentiation. |
| dmem[plaintext] = dmem[ciphertext]^dmem[exp] mod dmem[modulus] */ |
| la x14, ciphertext |
| la x15, exp |
| la x2, plaintext |
| jal x1, modexp |
| |
| /* copy all limbs of result to wide reg file */ |
| la x21, plaintext |
| li x8, 0 |
| loop x30, 2 |
| bn.lid x8, 0(x21++) |
| addi x8, x8, 1 |
| |
| ecall |
| |
| |
| .data |
| |
| /* Modulus */ |
| .balign 32 |
| modulus: |
| .word 0xc28cf49f |
| .word 0xb6e64c3b |
| .word 0xa21417f1 |
| .word 0x34ab89fe |
| .word 0xe4d4c752 |
| .word 0xe9289a03 |
| .word 0xc8aa371c |
| .word 0xafb68c05 |
| |
| .word 0x893c882e |
| .word 0xa62c908d |
| .word 0xd23f4ebf |
| .word 0xea5bb198 |
| .word 0xdb6f076f |
| .word 0xcfcc4b48 |
| .word 0x75a24aa4 |
| .word 0x7bda03fc |
| |
| .word 0xcb5adf60 |
| .word 0xbc7c20bc |
| .word 0x8ea4f2fe |
| .word 0x3ba5d46d |
| .word 0x21536a4e |
| .word 0x7f292995 |
| .word 0xaafd0e56 |
| .word 0xc8033b94 |
| |
| .word 0x127ca9e8 |
| .word 0xa3998c2e |
| .word 0xecf3ecf6 |
| .word 0xc39b1e20 |
| .word 0xdc59f4e7 |
| .word 0x5affc57c |
| .word 0x0a4536b4 |
| .word 0x962be299 |
| |
| |
| /* encrypted message */ |
| .balign 32 |
| ciphertext: |
| .word 0xe0e14a9b |
| .word 0x7ae96741 |
| .word 0x4a430036 |
| .word 0xcda13a47 |
| .word 0x79524410 |
| .word 0x3810cd51 |
| .word 0x3b47425f |
| .word 0x686f3abe |
| |
| .word 0x91dff899 |
| .word 0xbfa8b284 |
| .word 0x0539e396 |
| .word 0xa66cf53c |
| .word 0xbcdc315a |
| .word 0x0d595811 |
| .word 0x0a522e08 |
| .word 0x5b9dce33 |
| |
| .word 0x6fde2d48 |
| .word 0x587a618e |
| .word 0x6b4c0c56 |
| .word 0x4affcc62 |
| .word 0x6a88ead2 |
| .word 0x991f39d0 |
| .word 0x39f88b9a |
| .word 0x3c0d6626 |
| |
| .word 0xa3fe6181 |
| .word 0x82f3f1f6 |
| .word 0x43f4ed0b |
| .word 0x938bfd7b |
| .word 0x60de8b63 |
| .word 0x8ade6cc0 |
| .word 0x91f560d7 |
| .word 0x35f506d1 |
| |
| |
| /* private exponent */ |
| .balign 32 |
| exp: |
| .word 0x93a8cd95 |
| .word 0x24a2614b |
| .word 0xeeb788b3 |
| .word 0x6dfc48e4 |
| .word 0xca97cdc4 |
| .word 0x41146c79 |
| .word 0xf4ca744b |
| .word 0xc386c827 |
| |
| .word 0xd9ddaef3 |
| .word 0xae51440f |
| .word 0x9741739d |
| .word 0x9ebad71b |
| .word 0x9a7a2bfd |
| .word 0xfbd58848 |
| .word 0x13464f06 |
| .word 0x17f60ed9 |
| |
| .word 0x1d63a0b9 |
| .word 0x581ccd6c |
| .word 0x951579d6 |
| .word 0x35a9ec64 |
| .word 0xc3a08e32 |
| .word 0xdd2f62e8 |
| .word 0xc3739e4a |
| .word 0x01ca5c4e |
| |
| .word 0x3a107e7d |
| .word 0xf9dacc79 |
| .word 0x49ecbe20 |
| .word 0x5d21e910 |
| .word 0x9550ecb5 |
| .word 0x511778ce |
| .word 0x42209f7b |
| .word 0x41b468dc |
| |
| /* output buffer */ |
| .balign 32 |
| plaintext: |
| .zero 128 |
| |
| /* buffer for Montgomery constant RR */ |
| .balign 32 |
| RR: |
| .zero 128 |
| |
| /* buffer for Montgomery constant m0inv */ |
| .balign 32 |
| m0inv: |
| .zero 32 |
