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191 lines
5.6 KiB
191 lines
5.6 KiB
2 years ago
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.include "instr.inc"
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.text
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.global _start
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_start:
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# Get the address of the start of the program
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push_pc
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pop_r3
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# Display the introduction
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ld_r2_r3
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add_r2 (str_intro - _start)
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push_r3
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call PrintStr
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pop_r3
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# Bail if we're not running from the correct address
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cp_r3 _start
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jp_eq main
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ld_r2_r3
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add_r2 (str_wrong_address - _start)
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jp PrintStr
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main:
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# Gather the password string
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ld_r2 mem_input
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ld_r1 18
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ld_r0 0
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call MemSet
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ld_r2 str_password_prompt
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call PrintStr
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ld_r2 mem_input
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ld_r3 15
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call ReadStr
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ld_r2 mem_input
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call StrTrim
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# Hash the string
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ld_r2 mem_input
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ld_r0 0x9fc0
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hash_loop:
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ldr_r1_r2
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inc_r2
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cp_r1 0
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# r0 = (((r0 * 2) ^ r1) * 2) + r1
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shl_r0
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xor_r0_r1
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shl_r0
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add_r0_r1
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jp_eq decrypt
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jp hash_loop
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decrypt:
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# Initialize memory
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str_r0 mem_hash
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ld_r3 mem_encrypted
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ld_r2 mem_decrypted
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ld_r1 0x200
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call MemCpy
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# Decrypt the entire buffer
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ld_r2 mem_decrypted
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ld_r3 0x200 / 2
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decrypt_loop:
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call update_hash
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# *r2 -= mem_hash
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ld_r1_r0
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ldr_r0_r2
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xor_r0_r1
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str_r0_r2
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inc_r2
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inc_r2
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dec_r3
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cp_r3 0
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jp_ne decrypt_loop
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# Print out the results
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ld_r2 str_result_start
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call PrintStr
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ld_r2 mem_decrypted
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call PrintStr
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ld_r2 str_result_end
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call PrintStr
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ret
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update_hash:
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# mem_hash = (mem_hash * 0x41a7) ^ 0x5555
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ldr_r0 mem_hash
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mul_r0 0x41a7
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xor_r0 0x5555
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str_r0 mem_hash
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ret
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str_intro:
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.ascii "GLITCH RESEARCH LABORATORY SELF-CONTAINED ENCRYPTION TOOL\n\0"
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str_wrong_address:
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.ascii "PLEASE LOAD ME AT ADDRESS $2000... (EXITING)\n\0"
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str_password_prompt:
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.ascii "PLEASE ENTER ENCRYPTION PASSWORD: \0"
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str_result_start:
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.ascii "HERE IS THE ENCRYPTED DOCUMENT: "
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str_result_end:
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.ascii "\n--\n\0"
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mem_input:
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.ascii "________________\0\0"
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mem_hash:
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.ascii "__"
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# Padding
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.ascii "33333333"
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mem_encrypted:
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.byte 0xfb, 0x72, 0x3a, 0x22, 0x21, 0x4b, 0x6a, 0xc2
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.byte 0x28, 0xe6, 0xe4, 0xc1, 0xa7, 0x25, 0xb6, 0xe0
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.byte 0x98, 0xb2, 0x0a, 0xe0, 0x9b, 0xab, 0xc1, 0x84
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.byte 0xb8, 0x2d, 0x8f, 0xd8, 0x7e, 0x07, 0x3a, 0xcb
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.byte 0xc9, 0xf0, 0xf5, 0x38, 0x51, 0x43, 0xed, 0x52
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.byte 0xf8, 0x44, 0xe4, 0xc2, 0x50, 0x22, 0x27, 0x2a
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.byte 0x65, 0x44, 0x81, 0x79, 0xc2, 0x6c, 0xb4, 0xaf
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.byte 0xd9, 0x9d, 0x7c, 0x74, 0xb3, 0x58, 0xea, 0xcd
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.byte 0x69, 0xe2, 0xa2, 0xdf, 0xe7, 0xca, 0xc4, 0x65
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.byte 0xe0, 0xe8, 0xf3, 0xbe, 0xee, 0x97, 0x68, 0xad
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.byte 0x61, 0x0e, 0x27, 0x78, 0x32, 0x86, 0x6d, 0x5c
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.byte 0x02, 0xc2, 0x6e, 0xd1, 0xdf, 0x93, 0x14, 0x4d
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.byte 0xcb, 0x1a, 0x90, 0xf4, 0x20, 0x95, 0xc0, 0xd3
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.byte 0x1d, 0xe8, 0x73, 0x2b, 0xdb, 0xaf, 0xae, 0x74
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.byte 0x7a, 0x1d, 0x50, 0x4a, 0xa6, 0x9d, 0x56, 0xcc
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.byte 0xb5, 0x5d, 0x07, 0xd1, 0x04, 0xa7, 0x16, 0x5c
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.byte 0x1d, 0x40, 0x4e, 0x65, 0x51, 0xf2, 0x68, 0x0a
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.byte 0x4a, 0xb3, 0x56, 0x56, 0xc1, 0x51, 0x1f, 0x0f
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.byte 0xc2, 0x7d, 0x4b, 0x29, 0x5b, 0x58, 0x1d, 0x2f
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.byte 0xff, 0x66, 0xc0, 0x3c, 0xbb, 0xbb, 0x34, 0x93
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.byte 0x30, 0xe6, 0x34, 0xb7, 0x8d, 0xd4, 0x4a, 0xa3
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.byte 0xd7, 0x88, 0x00, 0x72, 0xba, 0x13, 0x0c, 0x4d
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.byte 0x97, 0x46, 0xe0, 0xbb, 0x07, 0xa6, 0xef, 0xfa
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.byte 0x12, 0x0a, 0xfe, 0x56, 0xe9, 0x14, 0x2b, 0xda
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.byte 0x64, 0x3c, 0xfe, 0xc5, 0x3c, 0xa3, 0x50, 0x02
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.byte 0x20, 0xb7, 0x20, 0x05, 0x3d, 0xdb, 0xf1, 0x8a
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.byte 0x81, 0x41, 0x4c, 0x24, 0x52, 0x38, 0x8f, 0xb9
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.byte 0x7e, 0x2e, 0x6f, 0x76, 0x1c, 0x3f, 0x97, 0x87
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.byte 0x16, 0xd5, 0xd3, 0xc9, 0x70, 0x92, 0xd7, 0xd2
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.byte 0x47, 0x59, 0xe6, 0x87, 0x12, 0x2c, 0xe0, 0xa5
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.byte 0x6c, 0x17, 0x9c, 0xbe, 0xee, 0xe4, 0xd4, 0x50
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.byte 0xea, 0x94, 0x57, 0x91, 0x4f, 0xb1, 0x57, 0xaa
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.byte 0x46, 0xe9, 0x86, 0x76, 0xd3, 0xf8, 0xb9, 0xa5
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.byte 0x8c, 0x9c, 0x57, 0x56, 0x0a, 0x72, 0x48, 0xc8
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.byte 0x14, 0xb6, 0x8b, 0xf2, 0x48, 0x3c, 0x4d, 0xb5
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.byte 0x3a, 0x48, 0x07, 0xa6, 0xf2, 0x8e, 0xa3, 0x0b
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.byte 0x39, 0x02, 0x75, 0x9b, 0xc8, 0xdc, 0x6f, 0x0a
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.byte 0x75, 0x00, 0x52, 0x6d, 0xbf, 0x77, 0x89, 0x2f
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.byte 0xce, 0xb0, 0x27, 0xef, 0x42, 0x1e, 0x36, 0xe1
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.byte 0x37, 0xc6, 0xf7, 0x77, 0x34, 0x1d, 0x6a, 0xd3
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.byte 0xa7, 0x48, 0x6a, 0xc1, 0x7d, 0xe7, 0x76, 0x8c
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.byte 0x62, 0x8f, 0x62, 0x8c, 0x5c, 0xe4, 0xf1, 0xf3
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.byte 0xfd, 0x5f, 0xb6, 0x9d, 0xb4, 0xd7, 0xa8, 0xa0
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.byte 0xcd, 0xde, 0x8b, 0x72, 0x73, 0xe4, 0xfa, 0xe7
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.byte 0x33, 0x8f, 0x11, 0x1e, 0xaf, 0xd3, 0x40, 0xa7
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.byte 0x86, 0x26, 0xf3, 0x77, 0x4c, 0x6e, 0x2d, 0x2d
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.byte 0xa4, 0x03, 0xc2, 0x74, 0x2e, 0xb3, 0xdd, 0x85
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.byte 0x29, 0x41, 0x90, 0xc3, 0xc7, 0x3a, 0x96, 0xb9
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.byte 0x8e, 0x35, 0xcf, 0x37, 0xc0, 0xc8, 0xff, 0xd5
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.byte 0x8b, 0x9f, 0xa1, 0xd9, 0x0f, 0x8e, 0x8e, 0xc6
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.byte 0x11, 0xc1, 0xc0, 0xc9, 0x9e, 0x5b, 0x9c, 0xa1
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.byte 0x2d, 0xc6, 0x4b, 0xf5, 0x34, 0x65, 0xb4, 0xcc
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.byte 0xac, 0x88, 0xbf, 0x49, 0x43, 0x77, 0xac, 0x8f
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.byte 0x61, 0x71, 0x8e, 0x59, 0x7f, 0x78, 0xd9, 0x73
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.byte 0x41, 0x90, 0x73, 0x8b, 0x8e, 0x93, 0x3f, 0x6e
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.byte 0xdd, 0x2e, 0x37, 0xe8, 0x72, 0x43, 0xa1, 0xf3
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.byte 0xa9, 0xfe, 0x7f, 0x98, 0xf3, 0xa5, 0x98, 0x43
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.byte 0xe5, 0x60, 0xb9, 0x5d, 0xbd, 0xba, 0x3f, 0xae
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.byte 0x71, 0xf6, 0xed, 0xc1, 0xfe, 0x8f, 0x2d, 0x15
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.byte 0xd9, 0xc6, 0xf7, 0x57, 0x83, 0x57, 0x7e, 0x10
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.byte 0xb6, 0xc3, 0x76, 0x29, 0xb1, 0x10, 0x12, 0x1e
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.byte 0xea, 0xa1, 0x15, 0x81, 0x9c, 0x22, 0x5f, 0x8a
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.byte 0xf3, 0xff, 0x1c, 0x37, 0x4e, 0x57, 0x1b, 0x26
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.byte 0x64, 0xb7, 0xca, 0x7c, 0xc8, 0x57, 0xd9, 0x57
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mem_decrypted:
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.fill 0x200, 1, 0
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