53 lines
920 B
C
53 lines
920 B
C
#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "crypt_des.h"
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static struct expanded_key __encrypt_key;
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void setkey(const char *key)
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{
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unsigned char bkey[8];
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int i, j;
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for (i = 0; i < 8; i++) {
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bkey[i] = 0;
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for (j = 7; j >= 0; j--, key++)
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bkey[i] |= (uint32_t)(*key & 1) << j;
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}
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__des_setkey(bkey, &__encrypt_key);
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}
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void encrypt(char *block, int edflag)
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{
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struct expanded_key decrypt_key, *key;
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uint32_t b[2];
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int i, j;
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char *p;
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p = block;
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for (i = 0; i < 2; i++) {
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b[i] = 0;
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for (j = 31; j >= 0; j--, p++)
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b[i] |= (uint32_t)(*p & 1) << j;
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}
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key = &__encrypt_key;
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if (edflag) {
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key = &decrypt_key;
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for (i = 0; i < 16; i++) {
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decrypt_key.l[i] = __encrypt_key.l[15-i];
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decrypt_key.r[i] = __encrypt_key.r[15-i];
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}
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}
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__do_des(b[0], b[1], b, b + 1, 1, 0, key);
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p = block;
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for (i = 0; i < 2; i++)
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for (j = 31; j >= 0; j--)
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*p++ = b[i]>>j & 1;
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}
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