?? des3cbc.c
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#include "os.h"#include "libsec.h"// Because of the way that non multiple of 8// buffers are handled, the decryptor must// be fed buffers of the same size as the// encryptor// If the length is not a multiple of 8, I encrypt// the overflow to be compatible with lacy's cryptlibvoiddes3CBCencrypt(uchar *p, int len, DES3state *s){ uchar *p2, *ip, *eip; for(; len >= 8; len -= 8){ p2 = p; ip = s->ivec; for(eip = ip+8; ip < eip; ) *p2++ ^= *ip++; triple_block_cipher(s->expanded, p, DES3EDE); memmove(s->ivec, p, 8); p += 8; } if(len > 0){ ip = s->ivec; triple_block_cipher(s->expanded, ip, DES3EDE); for(eip = ip+len; ip < eip; ) *p++ ^= *ip++; }}voiddes3CBCdecrypt(uchar *p, int len, DES3state *s){ uchar *ip, *eip, *tp; uchar tmp[8]; for(; len >= 8; len -= 8){ memmove(tmp, p, 8); triple_block_cipher(s->expanded, p, DES3DED); tp = tmp; ip = s->ivec; for(eip = ip+8; ip < eip; ){ *p++ ^= *ip; *ip++ = *tp++; } } if(len > 0){ ip = s->ivec; triple_block_cipher(s->expanded, ip, DES3EDE); for(eip = ip+len; ip < eip; ) *p++ ^= *ip++; }}?? 快捷鍵說明
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