mirror of
https://github.com/classilla/tenfourfox.git
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137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* tlsprfalg.c - TLS Pseudo Random Function (PRF) implementation
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifdef FREEBL_NO_DEPEND
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#include "stubs.h"
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#endif
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#include "blapi.h"
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#include "hasht.h"
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#include "alghmac.h"
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#define PHASH_STATE_MAX_LEN HASH_LENGTH_MAX
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/* TLS P_hash function */
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SECStatus
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TLS_P_hash(HASH_HashType hashType, const SECItem *secret, const char *label,
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SECItem *seed, SECItem *result, PRBool isFIPS)
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{
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unsigned char state[PHASH_STATE_MAX_LEN];
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unsigned char outbuf[PHASH_STATE_MAX_LEN];
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unsigned int state_len = 0, label_len = 0, outbuf_len = 0, chunk_size;
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unsigned int remaining;
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unsigned char *res;
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SECStatus status;
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HMACContext *cx;
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SECStatus rv = SECFailure;
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const SECHashObject *hashObj = HASH_GetRawHashObject(hashType);
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PORT_Assert((secret != NULL) && (secret->data != NULL || !secret->len));
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PORT_Assert((seed != NULL) && (seed->data != NULL));
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PORT_Assert((result != NULL) && (result->data != NULL));
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remaining = result->len;
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res = result->data;
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if (label != NULL)
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label_len = PORT_Strlen(label);
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cx = HMAC_Create(hashObj, secret->data, secret->len, isFIPS);
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if (cx == NULL)
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goto loser;
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/* initialize the state = A(1) = HMAC_hash(secret, seed) */
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HMAC_Begin(cx);
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HMAC_Update(cx, (unsigned char *)label, label_len);
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HMAC_Update(cx, seed->data, seed->len);
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status = HMAC_Finish(cx, state, &state_len, sizeof(state));
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if (status != SECSuccess)
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goto loser;
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/* generate a block at a time until we're done */
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while (remaining > 0) {
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HMAC_Begin(cx);
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HMAC_Update(cx, state, state_len);
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if (label_len)
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HMAC_Update(cx, (unsigned char *)label, label_len);
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HMAC_Update(cx, seed->data, seed->len);
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status = HMAC_Finish(cx, outbuf, &outbuf_len, sizeof(outbuf));
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if (status != SECSuccess)
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goto loser;
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/* Update the state = A(i) = HMAC_hash(secret, A(i-1)) */
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HMAC_Begin(cx);
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HMAC_Update(cx, state, state_len);
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status = HMAC_Finish(cx, state, &state_len, sizeof(state));
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if (status != SECSuccess)
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goto loser;
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chunk_size = PR_MIN(outbuf_len, remaining);
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PORT_Memcpy(res, &outbuf, chunk_size);
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res += chunk_size;
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remaining -= chunk_size;
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}
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rv = SECSuccess;
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loser:
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/* clear out state so it's not left on the stack */
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if (cx)
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HMAC_Destroy(cx, PR_TRUE);
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PORT_Memset(state, 0, sizeof(state));
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PORT_Memset(outbuf, 0, sizeof(outbuf));
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return rv;
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}
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SECStatus
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TLS_PRF(const SECItem *secret, const char *label, SECItem *seed,
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SECItem *result, PRBool isFIPS)
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{
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SECStatus rv = SECFailure, status;
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unsigned int i;
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SECItem tmp = { siBuffer, NULL, 0};
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SECItem S1;
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SECItem S2;
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PORT_Assert((secret != NULL) && (secret->data != NULL || !secret->len));
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PORT_Assert((seed != NULL) && (seed->data != NULL));
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PORT_Assert((result != NULL) && (result->data != NULL));
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S1.type = siBuffer;
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S1.len = (secret->len / 2) + (secret->len & 1);
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S1.data = secret->data;
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S2.type = siBuffer;
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S2.len = S1.len;
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S2.data = secret->data + (secret->len - S2.len);
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tmp.data = (unsigned char*)PORT_Alloc(result->len);
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if (tmp.data == NULL)
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goto loser;
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tmp.len = result->len;
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status = TLS_P_hash(HASH_AlgMD5, &S1, label, seed, result, isFIPS);
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if (status != SECSuccess)
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goto loser;
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status = TLS_P_hash(HASH_AlgSHA1, &S2, label, seed, &tmp, isFIPS);
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if (status != SECSuccess)
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goto loser;
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for (i = 0; i < result->len; i++)
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result->data[i] ^= tmp.data[i];
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rv = SECSuccess;
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loser:
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if (tmp.data != NULL)
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PORT_ZFree(tmp.data, tmp.len);
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return rv;
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}
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