48 lines
853 B
C
48 lines
853 B
C
#include "os.h"
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#include <libsec.h>
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// I wasn't sure what to do when the buffer was not
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// a multiple of 8. I did what lacy's cryptolib did
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// to be compatible, but it looks dangerous to me
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// since its encrypting plain text with the key. -- presotto
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void
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desECBencrypt(uint8_t *p, int len, DESstate *s)
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{
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int i;
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uint8_t tmp[8];
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for(; len >= 8; len -= 8){
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block_cipher(s->expanded, p, 0);
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p += 8;
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}
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if(len > 0){
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for (i=0; i<8; i++)
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tmp[i] = i;
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block_cipher(s->expanded, tmp, 0);
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for (i = 0; i < len; i++)
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p[i] ^= tmp[i];
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}
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}
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void
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desECBdecrypt(uint8_t *p, int len, DESstate *s)
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{
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int i;
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uint8_t tmp[8];
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for(; len >= 8; len -= 8){
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block_cipher(s->expanded, p, 1);
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p += 8;
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}
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if(len > 0){
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for (i=0; i<8; i++)
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tmp[i] = i;
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block_cipher(s->expanded, tmp, 0);
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for (i = 0; i < len; i++)
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p[i] ^= tmp[i];
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}
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}
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