mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
#ifndef PSX_EXECUTION_IDENTITY_H
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#define PSX_EXECUTION_IDENTITY_H
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#include "execution_profile.h"
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#include "psx_sha256.h"
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#include <string.h>
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/* Bind every network session, including a no-mod LAN session, to its fixed
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* execution implementation. Empty profile IDs retain legacy fixture behavior.
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* Validate before hashing so malformed content cannot become a valid digest. */
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static inline int psx_execution_content_identity(const char* content, char out[65]) {
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const char* input = content ? content : "";
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char normalized[65];
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size_t n = strlen(input);
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if (n && n != 64) return 0;
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for (size_t i = 0; i < n; ++i) {
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char c = input[i];
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if (c >= 'A' && c <= 'F') c += 'a' - 'A';
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if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) return 0;
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normalized[i] = c;
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}
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normalized[n] = 0;
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input = normalized;
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if (!PSX_EXECUTION_ID[0]) {
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memcpy(out, input, n + 1);
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return 1;
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}
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psx_sha256_ctx ctx;
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uint8_t bytes[32];
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const char salt[] = "psx-session-execution-v1:";
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const char hex[] = "0123456789abcdef";
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psx_sha256_init(&ctx);
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psx_sha256_update(&ctx, (const uint8_t*)salt, sizeof(salt) - 1);
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psx_sha256_update(&ctx, (const uint8_t*)PSX_EXECUTION_ID, strlen(PSX_EXECUTION_ID));
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psx_sha256_update(&ctx, (const uint8_t*)input, n);
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psx_sha256_final(&ctx, bytes);
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for (unsigned i = 0; i < 32; ++i) {
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out[2*i] = hex[bytes[i] >> 4];
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out[2*i+1] = hex[bytes[i] & 15];
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}
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out[64] = 0;
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return 1;
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}
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#endif
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