des3ECB.c (927B)
1 #include "os.h" 2 #include <mp.h> 3 #include <libsec.h> 4 5 /* I wasn't sure what to do when the buffer was not */ 6 /* a multiple of 8. I did what lacy's cryptolib did */ 7 /* to be compatible, but it looks dangerous to me */ 8 /* since its encrypting plain text with the key. -- presotto */ 9 10 void 11 des3ECBencrypt(uchar *p, int len, DES3state *s) 12 { 13 int i; 14 uchar tmp[8]; 15 16 for(; len >= 8; len -= 8){ 17 triple_block_cipher(s->expanded, p, DES3EDE); 18 p += 8; 19 } 20 21 if(len > 0){ 22 for (i=0; i<8; i++) 23 tmp[i] = i; 24 triple_block_cipher(s->expanded, tmp, DES3EDE); 25 for (i = 0; i < len; i++) 26 p[i] ^= tmp[i]; 27 } 28 } 29 30 void 31 des3ECBdecrypt(uchar *p, int len, DES3state *s) 32 { 33 int i; 34 uchar tmp[8]; 35 36 for(; len >= 8; len -= 8){ 37 triple_block_cipher(s->expanded, p, DES3DED); 38 p += 8; 39 } 40 41 if(len > 0){ 42 for (i=0; i<8; i++) 43 tmp[i] = i; 44 triple_block_cipher(s->expanded, tmp, DES3EDE); 45 for (i = 0; i < len; i++) 46 p[i] ^= tmp[i]; 47 } 48 }