ref: b540a22eb0c287398e21358d6b66c8e544001f77
dir: /sys/src/libsec/port/des3ECB.c/
#include "os.h" #include <libsec.h> // I wasn't sure what to do when the buffer was not // a multiple of 8. I did what lacy's cryptolib did // to be compatible, but it looks dangerous to me // since its encrypting plain text with the key. -- presotto void des3ECBencrypt(uchar *p, int len, DES3state *s) { int i; uchar tmp[8]; for(; len >= 8; len -= 8){ triple_block_cipher(s->expanded, p, DES3EDE); p += 8; } if(len > 0){ for (i=0; i<8; i++) tmp[i] = i; triple_block_cipher(s->expanded, tmp, DES3EDE); for (i = 0; i < len; i++) p[i] ^= tmp[i]; } } void des3ECBdecrypt(uchar *p, int len, DES3state *s) { int i; uchar tmp[8]; for(; len >= 8; len -= 8){ triple_block_cipher(s->expanded, p, DES3DED); p += 8; } if(len > 0){ for (i=0; i<8; i++) tmp[i] = i; triple_block_cipher(s->expanded, tmp, DES3EDE); for (i = 0; i < len; i++) p[i] ^= tmp[i]; } }