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53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/**
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* Author......: See docs/credits.txt
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* License.....: MIT
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*/
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#ifndef _CPU_DES_H
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#define _CPU_DES_H
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#define PERM_OP(a,b,n,m) \
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{ \
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u32 t; \
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t = a >> n; \
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t = t ^ b; \
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t = t & m; \
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b = b ^ t; \
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t = t << n; \
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a = a ^ t; \
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}
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#define HPERM_OP(a,n,m) \
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{ \
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u32 t; \
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t = a << (16 + n); \
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t = t ^ a; \
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t = t & m; \
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a = a ^ t; \
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t = t >> (16 + n); \
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a = a ^ t; \
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}
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#define DES_IP(l,r) \
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{ \
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PERM_OP (r, l, 4, 0x0f0f0f0f); \
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PERM_OP (l, r, 16, 0x0000ffff); \
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PERM_OP (r, l, 2, 0x33333333); \
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PERM_OP (l, r, 8, 0x00ff00ff); \
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PERM_OP (r, l, 1, 0x55555555); \
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}
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#define DES_FP(l,r) \
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{ \
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PERM_OP (l, r, 1, 0x55555555); \
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PERM_OP (r, l, 8, 0x00ff00ff); \
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PERM_OP (l, r, 2, 0x33333333); \
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PERM_OP (r, l, 16, 0x0000ffff); \
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PERM_OP (l, r, 4, 0x0f0f0f0f); \
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}
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void _des_keysetup (const u32 data[2], u32 Kc[16], u32 Kd[16]);
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void _des_encrypt (u32 data[2], const u32 Kc[16], const u32 Kd[16]);
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#endif // _CPU_DES_H
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