4 * arguments: key size in bits (must be multiple of 8)
6 * key values: 8 byte random IV and n byte random key
8 * encoding: do CBC encryption overwriting message
9 * encoding for MAC: do CBC and prepend last ciphertext block
12 #include "forwarder.h"
16 struct blowfish_cbc_state cbc;
19 static void mds_blowfish(struct mechdata **md_r) {
21 unsigned long keysize;
22 unsigned char iv[BLOWFISH_BLOCKBYTES];
23 unsigned char key[BLOWFISH_MAXKEYBYTES];
25 md= xmalloc(sizeof(md));
27 keysize= getarg_ulong();
28 arg_assert(!(keysize & 7));
30 arg_assert(keysize > 0 && keysize <= BLOWFISH_MAXKEYBYTES);
32 random_key(iv,sizeof(iv));
33 random_key(key,keysize);
35 blowfish_loadkey(&md->cbc.ek, key,keysize);
36 blowfish_cbc_setiv(&md->cbc, iv);
41 static void mes_blowfish(struct mechdata **md_r, int *maxprefix_io, int *maxsuffix_io) {
45 static void mds_bfmac(struct mechdata **md_r) {
49 static void mes_bfmac(struct mechdata **md_r, int *maxprefix_io, int *maxsuffix_io) {
51 *maxprefix_io += BLOWFISH_BLOCKBYTES;
56 arg_assert(!(msgsize & ~BLOWFISH_BLOCKBYTES));
60 if (msgsize & ~BLOWFISH_BLOCKBYTES) return "not multiple of block size"
62 #define FOREACH_BLOCK(func,inptr,outptr) \
66 while (ptr < buf->start + msgsize) \
67 func(&md->cbc,inptr,outptr); \
70 static void menc_blowfish(struct mechdata *md, struct buffer *buf) {
71 unsigned long msgsize;
73 FOREACH_BLOCK(blowfish_cbc_encrypt,ptr,ptr);
76 static const char *mdec_blowfish(struct mechdata *md, struct buffer *buf) {
77 unsigned long msgsize;
79 FOREACH_BLOCK(blowfish_cbc_decrypt,ptr,ptr);
83 static void menc_bfmac(struct mechdata *md, struct buffer *buf) {
84 unsigned long msgsize;
85 unsigned char outblock[BLOWFISH_BLOCKBYTES];
88 FOREACH_BLOCK(blowfish_cbc_encrypt,ptr,outblock);
89 memcpy(buf_prepend(buf,BLOWFISH_BLOCKBYTES), outblock, BLOWFISH_BLOCKBYTES);
92 static const char *mdec_bfmac(struct mechdata *md, struct buffer *buf) {
93 unsigned long msgsize;
94 unsigned char outblock[BLOWFISH_BLOCKBYTES];
95 unsigned char *checkblock;
97 BUF_UNPREPEND(checkblock,buf,BLOWFISH_BLOCKBYTES);
99 FOREACH_BLOCK(blowfish_cbc_encrypt,ptr,outblock);
100 if (memcmp(checkblock,outblock,BLOWFISH_BLOCKBYTES)) return "verify failed";
104 const struct mechanism mechlist_blowfish[]= {
105 STANDARD_MECHANISM("blowfish-cbcmac", bfmac)
106 STANDARD_MECHANISM("blowfish-cbc", blowfish)