*ok= 0;
return TCL_OK;
}
+
+int do_hbytes_hash(ClientData cd, Tcl_Interp *ip, const HashAlgInfo *alg,
+ HBytes_Value message, HBytes_Value *result) {
+ Byte *dest;
+
+ dest= hbytes_arrayspace(result,alg->hashsize);
+ alg->oneshot(dest, hbytes_data(&message), hbytes_len(&message));
+ return TCL_OK;
+}
+
+#define OBJ_CIPHKEY(o) ((CiphKeyValue*)(o)->internalRep.otherValuePtr)
+
+typedef struct {
+ int valuelen, bufferslen;
+ Byte *value, *buffers;
+ const void *alg;
+ void *alpha, *beta; /* key schedules etc.; each may be 0 */
+} CiphKeyValue;
+
+static void freealg(CiphKeyValue *key) {
+ TFREE(key->alpha);
+ TFREE(key->beta);
+}
+
+static void key_t_free(Tcl_Obj *obj) {
+ CiphKeyValue *key= OBJ_CIPHKEY(obj);
+ freealg(key);
+ TFREE(key->value);
+ TFREE(key->buffers);
+}
+
+static void noalg(CiphKeyValue *key) {
+ key->alg= 0;
+ key->alpha= key->beta= 0;
+}
+
+static void key_t_dup(Tcl_Obj *src_obj, Tcl_Obj *dup_obj) {
+ CiphKeyValue *src= OBJ_CIPHKEY(src_obj);
+ CiphKeyValue *dup= TALLOC(sizeof(*dup));
+ dup->valuelen= src->valuelen;
+ dup->value= src->valuelen ? TALLOC(src->valuelen) : 0;
+ dup->buffers= 0; dup->bufferslen= 0;
+ memcpy(dup->value, src->value, src->valuelen);
+ noalg(dup);
+ dup_obj->internalRep.otherValuePtr= dup;
+}
+
+static void key_t_ustr(Tcl_Obj *o) {
+ obj_updatestr_array(o, OBJ_CIPHKEY(o)->value, OBJ_CIPHKEY(o)->valuelen);
+}
+
+static int key_t_sfa(Tcl_Interp *ip, Tcl_Obj *o) {
+ int rc, l;
+ CiphKeyValue *val;
+
+ rc= Tcl_ConvertToType(ip,o,&hbytes_type); if (rc) return rc;
+ val= TALLOC(sizeof(*val));
+ val->valuelen= l= hbytes_len(OBJ_HBYTES(o));
+ val->value= TALLOC(l);
+ val->buffers= 0;
+ val->bufferslen= 0;
+ memcpy(val->value, hbytes_data(OBJ_HBYTES(o)), l);
+ noalg(val);
+
+ objfreeir(o);
+ o->internalRep.otherValuePtr= val;
+ o->typePtr= &blockcipherkey_type;
+
+ return TCL_OK;
+}
+
+Tcl_ObjType blockcipherkey_type = {
+ "blockcipher-key",
+ key_t_free, key_t_dup, key_t_ustr, key_t_sfa
+};
+
+CiphKeyValue *get_key(Tcl_Interp *ip, Tcl_Obj *key_obj,
+ const void *alg, int want_bufferslen) {
+ CiphKeyValue *key;
+ int rc;
+
+ rc= Tcl_ConvertToType(ip,key_obj,&blockcipherkey_type); if (rc) return 0;
+ key= OBJ_CIPHKEY(key_obj);
+
+ if (key->alg != alg) {
+ freealg(key);
+ noalg(key);
+ key->alg= alg;
+ }
+
+ if (key->bufferslen < want_bufferslen) {
+ TFREE(key->buffers);
+ key->buffers= TALLOC(want_bufferslen);
+ key->bufferslen= want_bufferslen;
+ }
+ return key;
+}
+
+int do_hbytes_blockcipher(ClientData cd, Tcl_Interp *ip, int encrypt,
+ HBytes_Var v, const BlockCipherAlgInfo *alg,
+ Tcl_Obj *key_obj, const BlockCipherModeInfo *mode,
+ HBytes_Value iv, HBytes_Value *result) {
+ int rc, want_bufferslen, data_len, iv_want;
+ CiphKeyValue *key;
+ const char *failure;
+ void *sched, **schedp;
+
+ want_bufferslen= alg->blocksize * (mode->buf_blocks + mode->iv_blocks);
+ key= get_key(ip, key_obj, alg, want_bufferslen);
+
+ schedp= (alg->decrypt.make_schedule==alg->encrypt.make_schedule
+ || encrypt) ? &key->alpha : &key->beta;
+ sched= *schedp;
+ if (!sched) {
+ if (key->valuelen < alg->key_min) return staticerr(ip, "key too short");
+ if (key->valuelen > alg->key_max) return staticerr(ip, "key too long");
+
+ sched= TALLOC(alg->schedule_size);
+ (encrypt ? &alg->encrypt : &alg->decrypt)->make_schedule
+ (sched, key->value, key->valuelen);
+ *schedp= sched;
+ }
+
+ iv_want= alg->blocksize * mode->iv_blocks;
+ if (hbytes_issentinel(&iv)) {
+ if (!encrypt) return staticerr(ip,"must supply iv when decrypting");
+ rc= get_urandom(ip, key->buffers, iv_want);
+ if (rc) return rc;
+ } else {
+ int iv_supplied= hbytes_len(&iv);
+ if (iv_supplied > iv_want)
+ return staticerr(ip, "iv too large for algorithm and mode");
+ memcpy(key->buffers, hbytes_data(&iv), iv_supplied);
+ memset(key->buffers + iv_supplied, 0, iv_want - iv_supplied);
+ }
+
+ data_len= hbytes_len(v.hb);
+ if (data_len % alg->blocksize)
+ return staticerr(ip, "block cipher input not whole number of blocks");
+
+ failure=
+ (encrypt ? mode->encrypt : mode->decrypt)
+ (hbytes_data(v.hb), data_len / alg->blocksize,
+ key->buffers, key->buffers + iv_want,
+ alg, encrypt,
+ alg->blocksize, sched);
+
+ if (failure)
+ return staticerr(ip, failure);
+
+ hbytes_array(result, key->buffers, iv_want);
+
+ return TCL_OK;
+}
+
+static void dbuf(const char *m, const Byte *a, int l) {
+ fprintf(stderr,"dbuf %s l=%d ",m,l);
+ while (l-->0) fprintf(stderr,"%02x",*a++);
+ putc('\n',stderr);
+}
+
+int do_hbytes_hmac(ClientData cd, Tcl_Interp *ip, const HashAlgInfo *alg,
+ HBytes_Value message, Tcl_Obj *key_obj,
+ Tcl_Obj *maclen_obj, HBytes_Value *result) {
+ /* key->alpha = state after H(K XOR ipad <unfinished>
+ * key->beta = state after H(K XOR opad <unfinished>
+ * key->buffers = room for one block, or one state
+ */
+ CiphKeyValue *key;
+ Byte *dest;
+ int i, ml, rc;
+
+ if (maclen_obj) {
+ rc= Tcl_GetIntFromObj(ip, maclen_obj, &ml); if (rc) return rc;
+ if (ml<0 || ml>alg->hashsize)
+ return staticerr(ip, "requested hmac output size out of range");
+ } else {
+ ml= alg->hashsize;
+ }
+
+ key= get_key(ip, key_obj, alg,
+ alg->blocksize > alg->statesize
+ ? alg->blocksize : alg->statesize);
+
+ if (!key->alpha) {
+ assert(!key->beta);
+
+ if (key->valuelen > alg->blocksize)
+ return staticerr(ip, "key to hmac longer than hash block size");
+
+dbuf("start key",key->value,key->valuelen);
+ memcpy(key->buffers, key->value, key->valuelen);
+ memset(key->buffers + key->valuelen, 0, alg->blocksize - key->valuelen);
+ for (i=0; i<alg->blocksize; i++) key->buffers[i] ^= 0x36;
+
+ key->alpha= TALLOC(alg->statesize);
+ alg->init(key->alpha);
+dbuf("inner key",key->buffers,alg->blocksize);
+ alg->update(key->alpha, key->buffers, alg->blocksize);
+
+ key->beta= TALLOC(alg->statesize);
+ alg->init(key->beta);
+ for (i=0; i<alg->blocksize; i++) key->buffers[i] ^= (0x5c ^ 0x36);
+ alg->update(key->beta, key->buffers, alg->blocksize);
+dbuf("inner key",key->buffers,alg->blocksize);
+ }
+ assert(key->beta);
+
+ dest= hbytes_arrayspace(result, alg->hashsize);
+
+ memcpy(key->buffers, key->alpha, alg->statesize);
+ alg->update(key->buffers, hbytes_data(&message), hbytes_len(&message));
+ alg->final(key->buffers, dest);
+dbuf("inner hash",dest,alg->hashsize);
+
+ memcpy(key->buffers, key->beta, alg->statesize);
+ alg->update(key->buffers, dest, alg->hashsize);
+ alg->final(key->buffers, dest);
+dbuf("outer hash",dest,alg->hashsize);
+
+ hbytes_unappend(result, alg->hashsize - ml);
+
+ return TCL_OK;
+}
~ian / chiark-tcl.git / blobdiff