#include "hbytes.h"
#include "tables.h"
-#include "serpent.h"
void memxor(Byte *dest, const Byte *src, int l) {
while (l--) *dest++ ^= *src++;
}
-const PadMethod padmethods[]= {
+const PadOp padops[]= {
{ "un", 0, 0 },
{ "ua", 0, 1 },
{ "pn", 1, 0 },
{ 0 }
};
-int do_hbytes_pkcs5(ClientData cd, Tcl_Interp *ip,
- const PadMethod *meth, HBytes_Var v, Tcl_Obj *block,
- int *ok) {
- int rc, blocksize, padlen, old_len, i;
- Byte *padding;
- const Byte *unpad;
+typedef struct {
+ HBytes_Value *hb;
+ int pad, blocksize; /* 0 or 1 */
+} PadMethodClientData;
+
+int do_hbytes_pad(ClientData cd, Tcl_Interp *ip, const PadOp *op,
+ HBytes_Var v, Tcl_Obj *blocksz, const PadMethodInfo *meth,
+ int methargsc, Tcl_Obj *const *methargsv) {
+ PadMethodClientData pmcd;
+ int rc;
- if (meth->use_algname) {
+ if (op->use_algname) {
const BlockCipherAlgInfo *alg;
- alg= enum_lookup_cached(ip,block,blockcipheralginfos,"cipher alg for pad");
+ alg= enum_lookup_cached(ip,blocksz,blockcipheralginfos,
+ "blockcipher alg for pad");
if (!alg) return TCL_ERROR;
- blocksize= alg->blocksize;
+ pmcd.blocksize= alg->blocksize;
} else {
- rc= Tcl_GetIntFromObj(ip, block, &blocksize); if (rc) return rc;
- if (blocksize < 1 || blocksize > 255)
- return staticerr(ip, "block size out of pkcs#5 range 1..255");
+ rc= Tcl_GetIntFromObj(ip, blocksz, &pmcd.blocksize); if (rc) return rc;
+ if (pmcd.blocksize < 1) staticerr(ip, "block size must be at least 1", 0);
}
- if (meth->pad) {
- padlen= blocksize - (hbytes_len(v.hb) % blocksize);
- padding= hbytes_append(v.hb, padlen);
+ pmcd.hb= v.hb;
+ pmcd.pad= op->pad;
+
+ return meth->func(&pmcd,ip,methargsc,methargsv);
+}
+
+int do_padmethodinfo_rfc2406(ClientData cd, Tcl_Interp *ip,
+ Tcl_Obj *nxthdr_arg, int *ok) {
+ const PadMethodClientData *pmcd= (const void*)cd;
+ int i, rc, padlen, old_len;
+
+ if (pmcd->blocksize > 256)
+ return staticerr(ip, "block size too large for RFC2406 padding", 0);
+
+ if (pmcd->pad) {
+ Byte *padding;
+ HBytes_Value nxthdr;
+
+ rc= pat_hb(ip,nxthdr_arg,&nxthdr);
+ if (rc) return rc;
+
+ if (hbytes_len(&nxthdr) != 1) return
+ staticerr(ip, "RFC2406 next header field must be exactly 1 byte", 0);
+ padlen= pmcd->blocksize-1 - ((hbytes_len(pmcd->hb)+1) % pmcd->blocksize);
+ padding= hbytes_append(pmcd->hb, padlen+2);
+ for (i=1; i<=padlen; i++)
+ *padding++ = i;
+ *padding++ = padlen;
+ *padding++ = hbytes_data(&nxthdr)[0];
+ *ok= 1;
+
+ } else {
+ const Byte *padding, *trailer;
+ HBytes_Value nxthdr;
+ Tcl_Obj *nxthdr_valobj, *ro;
+
+ *ok= 0;
+ old_len= hbytes_len(pmcd->hb); if (old_len % pmcd->blocksize) goto quit;
+ trailer= hbytes_unappend(pmcd->hb, 2); if (!trailer) goto quit;
+
+ padlen= trailer[0];
+ hbytes_array(&nxthdr,trailer+1,1);
+ nxthdr_valobj= ret_hb(ip,nxthdr);
+ ro= Tcl_ObjSetVar2(ip,nxthdr_arg,0,nxthdr_valobj,TCL_LEAVE_ERR_MSG);
+ if (!ro) { Tcl_DecrRefCount(nxthdr_valobj); return TCL_ERROR; }
+
+ padding= hbytes_unappend(pmcd->hb, padlen);
+ for (i=1; i<=padlen; i++)
+ if (*padding++ != i) goto quit;
+
+ *ok= 1;
+
+ quit:;
+
+ }
+
+ return TCL_OK;
+}
+
+int do_padmethodinfo_pkcs5(ClientData cd, Tcl_Interp *ip, int *ok) {
+ const PadMethodClientData *pmcd= (const void*)cd;
+ int padlen, old_len, i;
+
+ if (pmcd->blocksize > 255)
+ return staticerr(ip, "block size too large for pkcs#5", 0);
+
+ if (pmcd->pad) {
+
+ Byte *padding;
+
+ padlen= pmcd->blocksize - (hbytes_len(pmcd->hb) % pmcd->blocksize);
+ padding= hbytes_append(pmcd->hb, padlen);
memset(padding, padlen, padlen);
+
} else {
- old_len= hbytes_len(v.hb); if (old_len % blocksize) goto bad;
- unpad= hbytes_unappend(v.hb, 1); if (!unpad) goto bad;
- padlen= *unpad;
- if (padlen < 1 || padlen > blocksize) goto bad;
- unpad= hbytes_unappend(v.hb, padlen-1); if (!unpad) goto bad;
- for (i=0; i<padlen-1; i++, unpad++) if (*unpad != padlen) goto bad;
+
+ const Byte *padding;
+
+ old_len= hbytes_len(pmcd->hb); if (old_len % pmcd->blocksize) goto bad;
+ padding= hbytes_unappend(pmcd->hb, 1); if (!padding) goto bad;
+ padlen= *padding;
+ if (padlen < 1 || padlen > pmcd->blocksize) goto bad;
+ padding= hbytes_unappend(pmcd->hb, padlen-1); if (!padding) goto bad;
+
+ for (i=0; i<padlen-1; i++, padding++) if (*padding != padlen) goto bad;
+
}
*ok= 1;
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 BlockCipherAlgInfo *alg;
- void *encrypt, *decrypt; /* key schedules; each may be 0 */
+ const void *alg;
+ void *alpha, *beta; /* key schedules etc.; each may be 0 */
} CiphKeyValue;
static void freealg(CiphKeyValue *key) {
- TFREE(key->encrypt);
- TFREE(key->decrypt);
+ TFREE(key->alpha);
+ TFREE(key->beta);
}
static void key_t_free(Tcl_Obj *obj) {
static void noalg(CiphKeyValue *key) {
key->alg= 0;
- key->encrypt= key->decrypt= 0;
+ key->alpha= key->beta= 0;
}
static void key_t_dup(Tcl_Obj *src_obj, Tcl_Obj *dup_obj) {
memcpy(dup->value, src->value, src->valuelen);
noalg(dup);
dup_obj->internalRep.otherValuePtr= dup;
+ dup_obj->typePtr= &blockcipherkey_type;
}
static void key_t_ustr(Tcl_Obj *o) {
key_t_free, key_t_dup, key_t_ustr, key_t_sfa
};
-int do_hbytes_blockciph(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;
+static CiphKeyValue *get_key(Tcl_Interp *ip, Tcl_Obj *key_obj,
+ const void *alg, int want_bufferslen) {
CiphKeyValue *key;
- const char *failure;
- void *sched, **schedp;
-
- rc= Tcl_ConvertToType(ip,key_obj,&blockcipherkey_type); if (rc) return rc;
+ 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);
-
- if (key->valuelen < alg->key_min) return staticerr(ip, "key too short");
- if (key->valuelen > alg->key_max) return staticerr(ip, "key too long");
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,
+ const BlockCipherOp *op,
+ int objc, Tcl_Obj *const *objv) {
+ return op->func((void*)op,ip,objc,objv);
+}
+
+static int blockcipher_prep(Tcl_Interp *ip, Tcl_Obj *key_obj,
+ const HBytes_Value *iv, int decrypt,
+ const BlockCipherAlgInfo *alg,
+ const BlockCipherModeInfo *mode, int data_len,
+ const CiphKeyValue **key_r, const void **sched_r,
+ const Byte **iv_r, int *iv_lenbytes_r,
+ Byte **buffers_r, int *nblocks_r) {
+ void *sched, **schedp;
+ int want_bufferslen, want_iv;
+ int rc;
+ CiphKeyValue *key;
+
+ if (data_len % alg->blocksize)
+ return staticerr(ip, "block cipher input not whole number of blocks",
+ "HBYTES BLOCKCIPHER LENGTH");
+
+ want_bufferslen= alg->blocksize * (mode->buf_blocks + mode->iv_blocks);
+ key= get_key(ip, key_obj, alg, want_bufferslen); if (!key) return TCL_ERROR;
- schedp= (alg->decrypt.make_schedule!=alg->encrypt.make_schedule
- && !encrypt) ? &key->decrypt : &key->encrypt;
+ schedp= (alg->decrypt.make_schedule==alg->encrypt.make_schedule
+ || !decrypt) ? &key->alpha : &key->beta;
sched= *schedp;
if (!sched) {
+ if (key->valuelen < alg->key_min)
+ return staticerr(ip, "key too short", "HBYTES BLOCKCIPHER PARAMS");
+ if (key->valuelen > alg->key_max)
+ return staticerr(ip, "key too long", "HBYTES BLOCKCIPHER PARAMS");
+
sched= TALLOC(alg->schedule_size);
- (encrypt ? &alg->encrypt : &alg->decrypt)->make_schedule
+ (decrypt ? &alg->decrypt : &alg->encrypt)->make_schedule
(sched, key->value, key->valuelen);
*schedp= sched;
}
-
- want_bufferslen= alg->blocksize * (mode->buf_blocks + mode->iv_blocks);
- if (key->bufferslen < want_bufferslen) {
- TFREE(key->buffers);
- key->buffers= TALLOC(want_bufferslen);
- key->bufferslen= want_bufferslen;
- }
- 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);
+ want_iv= alg->blocksize * mode->iv_blocks;
+ if (!want_iv) {
+ if (!hbytes_issentinel(iv))
+ return staticerr(ip,"iv supplied but mode does not take one", 0);
+ } else if (hbytes_issentinel(iv)) {
+ if (decrypt) return staticerr(ip,"must supply iv when decrypting", 0);
+ rc= get_urandom(ip, key->buffers, want_iv);
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);
+ int iv_supplied= hbytes_len(iv);
+ if (iv_supplied > want_iv)
+ return staticerr(ip, "iv too large for algorithm and mode",
+ "HBYTES BLOCKCIPHER PARAMS");
+ memcpy(key->buffers, hbytes_data(iv), iv_supplied);
+ memset(key->buffers + iv_supplied, 0, want_iv - iv_supplied);
}
- data_len= hbytes_len(v.hb);
- if (data_len % alg->blocksize)
- return staticerr(ip, "block cipher input not whole number of blocks");
+ *key_r= key;
+ *sched_r= sched;
+
+ *iv_r= key->buffers;
+ *iv_lenbytes_r= want_iv;
+ *buffers_r= key->buffers + want_iv;
+ *nblocks_r= data_len / alg->blocksize;
+
+ return TCL_OK;
+}
+
+int do_blockcipherop_d(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, const BlockCipherAlgInfo *alg,
+ Tcl_Obj *key_obj, const BlockCipherModeInfo *mode,
+ HBytes_Value iv, HBytes_Value *result) {
+ return do_blockcipherop_e(cd,ip,v,alg,key_obj,mode,iv,result);
+}
+
+int do_blockcipherop_e(ClientData cd, Tcl_Interp *ip,
+ HBytes_Var v, const BlockCipherAlgInfo *alg,
+ Tcl_Obj *key_obj, const BlockCipherModeInfo *mode,
+ HBytes_Value iv, HBytes_Value *result) {
+ const BlockCipherOp *op= (const void*)cd;
+ int encrypt= op->encrypt;
+ int rc, iv_lenbytes;
+ const CiphKeyValue *key;
+ const char *failure;
+ const Byte *ivbuf;
+ Byte *buffers;
+ const void *sched;
+ int nblocks;
+
+ if (!mode->encrypt)
+ return staticerr(ip, "mode does not support encrypt/decrypt", 0);
+
+ rc= blockcipher_prep(ip,key_obj,&iv,!encrypt,
+ alg,mode, hbytes_len(v.hb),
+ &key,&sched,
+ &ivbuf,&iv_lenbytes,
+ &buffers,&nblocks);
+ if (rc) return rc;
+
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);
+ (hbytes_data(v.hb), nblocks, ivbuf, buffers, alg, encrypt, sched);
+
+ if (failure)
+ return staticerr(ip, failure, "HBYTES BLOCKCIPHER CRYPTFAIL CRYPT");
+
+ hbytes_array(result, ivbuf, iv_lenbytes);
+
+ return TCL_OK;
+}
+int do_blockcipherop_mac(ClientData cd, Tcl_Interp *ip,
+ HBytes_Value msg, const BlockCipherAlgInfo *alg,
+ Tcl_Obj *key_obj, const BlockCipherModeInfo *mode,
+ HBytes_Value iv, HBytes_Value *result) {
+ const CiphKeyValue *key;
+ const char *failure;
+ const Byte *ivbuf;
+ Byte *buffers;
+ const void *sched;
+ int nblocks, iv_lenbytes;
+ int rc;
+
+ if (!mode->mac)
+ return staticerr(ip, "mode does not support mac generation", 0);
+
+ rc= blockcipher_prep(ip,key_obj,&iv,0,
+ alg,mode, hbytes_len(&msg),
+ &key,&sched,
+ &ivbuf,&iv_lenbytes,
+ &buffers,&nblocks);
+ if (rc) return rc;
+
+ failure= mode->mac(hbytes_data(&msg), nblocks, ivbuf, buffers, alg, sched);
if (failure)
- return staticerr(ip, failure);
+ return staticerr(ip,failure, "HBYTES BLOCKCIPHER CRYPTFAIL MAC");
+
+ hbytes_array(result, buffers, alg->blocksize * mode->mac_blocks);
+
+ return TCL_OK;
+}
+
+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",
+ "HBYTES HMAC PARAMS");
+ } else {
+ ml= alg->hashsize;
+ }
+
+ key= get_key(ip, key_obj, alg,
+ alg->blocksize > alg->statesize
+ ? alg->blocksize : alg->statesize);
- hbytes_array(result, key->buffers, iv_want);
+ if (!key->alpha) {
+ assert(!key->beta);
+
+ if (key->valuelen > alg->blocksize)
+ return staticerr(ip, "key to hmac longer than hash block size",
+ "HBYTES HMAC PARAMS");
+
+ 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);
+ 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);
+ }
+ 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);
+
+ memcpy(key->buffers, key->beta, alg->statesize);
+ alg->update(key->buffers, dest, alg->hashsize);
+ alg->final(key->buffers, dest);
+
+ hbytes_unappend(result, alg->hashsize - ml);
+
+ return TCL_OK;
+}
+
+int do_blockcipherop_prop(ClientData cd, Tcl_Interp *ip,
+ const BlockCipherPropInfo *prop,
+ const BlockCipherAlgInfo *alg, int *result) {
+ *result= *(const int*)((const char*)alg + prop->int_offset);
+ return TCL_OK;
+}
+int do_hbytes_hash_prop(ClientData cd, Tcl_Interp *ip,
+ const HashAlgPropInfo *prop,
+ const HashAlgInfo *alg, int *result) {
+ *result= *(const int*)((const char*)alg + prop->int_offset);
return TCL_OK;
}
~ian / chiark-tcl.git / blobdiff