| /* |
| * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project |
| * 2016. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 2015 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * licensing@OpenSSL.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). |
| * |
| */ |
| |
| #include <stdio.h> |
| #include "internal/cryptlib.h" |
| #include <openssl/kdf.h> |
| #include <openssl/evp.h> |
| #include "internal/evp_int.h" |
| |
| static int tls1_prf_alg(const EVP_MD *md, |
| const unsigned char *sec, size_t slen, |
| const unsigned char *seed, size_t seed_len, |
| unsigned char *out, size_t olen); |
| |
| #define TLS1_PRF_MAXBUF 1024 |
| |
| /* TLS KDF pkey context structure */ |
| |
| typedef struct { |
| /* Digest to use for PRF */ |
| const EVP_MD *md; |
| /* Secret value to use for PRF */ |
| unsigned char *sec; |
| size_t seclen; |
| /* Buffer of concatenated seed data */ |
| unsigned char seed[TLS1_PRF_MAXBUF]; |
| size_t seedlen; |
| } TLS1_PRF_PKEY_CTX; |
| |
| static int pkey_tls1_prf_init(EVP_PKEY_CTX *ctx) |
| { |
| TLS1_PRF_PKEY_CTX *kctx; |
| |
| kctx = OPENSSL_zalloc(sizeof(*kctx)); |
| if (kctx == NULL) |
| return 0; |
| ctx->data = kctx; |
| |
| return 1; |
| } |
| |
| static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx) |
| { |
| TLS1_PRF_PKEY_CTX *kctx = ctx->data; |
| OPENSSL_clear_free(kctx->sec, kctx->seclen); |
| OPENSSL_cleanse(kctx->seed, kctx->seedlen); |
| OPENSSL_free(kctx); |
| } |
| |
| static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| { |
| TLS1_PRF_PKEY_CTX *kctx = ctx->data; |
| switch (type) { |
| case EVP_PKEY_CTRL_TLS_MD: |
| kctx->md = p2; |
| return 1; |
| |
| case EVP_PKEY_CTRL_TLS_SECRET: |
| if (p1 < 0) |
| return 0; |
| if (kctx->sec != NULL) |
| OPENSSL_clear_free(kctx->sec, kctx->seclen); |
| OPENSSL_cleanse(kctx->seed, kctx->seedlen); |
| kctx->seedlen = 0; |
| kctx->sec = OPENSSL_memdup(p2, p1); |
| if (kctx->sec == NULL) |
| return 0; |
| kctx->seclen = p1; |
| return 1; |
| |
| case EVP_PKEY_CTRL_TLS_SEED: |
| if (p1 == 0 || p2 == NULL) |
| return 1; |
| if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen)) |
| return 0; |
| memcpy(kctx->seed + kctx->seedlen, p2, p1); |
| kctx->seedlen += p1; |
| return 1; |
| |
| default: |
| return -2; |
| |
| } |
| } |
| |
| static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx, |
| const char *type, const char *value) |
| { |
| if (value == NULL) { |
| KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING); |
| return 0; |
| } |
| if (strcmp(type, "md") == 0) { |
| TLS1_PRF_PKEY_CTX *kctx = ctx->data; |
| |
| const EVP_MD *md = EVP_get_digestbyname(value); |
| if (md == NULL) { |
| KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST); |
| return 0; |
| } |
| kctx->md = md; |
| return 1; |
| } |
| if (strcmp(type, "secret") == 0) |
| return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value); |
| if (strcmp(type, "hexsecret") == 0) |
| return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value); |
| if (strcmp(type, "seed") == 0) |
| return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value); |
| if (strcmp(type, "hexseed") == 0) |
| return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value); |
| return -2; |
| } |
| |
| static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key, |
| size_t *keylen) |
| { |
| TLS1_PRF_PKEY_CTX *kctx = ctx->data; |
| if (kctx->md == NULL || kctx->sec == NULL || kctx->seedlen == 0) { |
| KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_PARAMETER); |
| return 0; |
| } |
| return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen, |
| kctx->seed, kctx->seedlen, |
| key, *keylen); |
| } |
| |
| const EVP_PKEY_METHOD tls1_prf_pkey_meth = { |
| EVP_PKEY_TLS1_PRF, |
| 0, |
| pkey_tls1_prf_init, |
| 0, |
| pkey_tls1_prf_cleanup, |
| |
| 0, 0, |
| 0, 0, |
| |
| 0, |
| 0, |
| |
| 0, |
| 0, |
| |
| 0, 0, |
| |
| 0, 0, 0, 0, |
| |
| 0, 0, |
| |
| 0, 0, |
| |
| 0, |
| pkey_tls1_prf_derive, |
| pkey_tls1_prf_ctrl, |
| pkey_tls1_prf_ctrl_str |
| }; |
| |
| static int tls1_prf_P_hash(const EVP_MD *md, |
| const unsigned char *sec, size_t sec_len, |
| const unsigned char *seed, size_t seed_len, |
| unsigned char *out, size_t olen) |
| { |
| int chunk; |
| EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL; |
| EVP_PKEY *mac_key = NULL; |
| unsigned char A1[EVP_MAX_MD_SIZE]; |
| size_t A1_len; |
| int ret = 0; |
| |
| chunk = EVP_MD_size(md); |
| OPENSSL_assert(chunk >= 0); |
| |
| ctx = EVP_MD_CTX_new(); |
| ctx_tmp = EVP_MD_CTX_new(); |
| ctx_init = EVP_MD_CTX_new(); |
| if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL) |
| goto err; |
| EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); |
| mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len); |
| if (mac_key == NULL) |
| goto err; |
| if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key)) |
| goto err; |
| if (!EVP_MD_CTX_copy_ex(ctx, ctx_init)) |
| goto err; |
| if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len)) |
| goto err; |
| if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) |
| goto err; |
| |
| for (;;) { |
| /* Reinit mac contexts */ |
| if (!EVP_MD_CTX_copy_ex(ctx, ctx_init)) |
| goto err; |
| if (!EVP_DigestSignUpdate(ctx, A1, A1_len)) |
| goto err; |
| if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx)) |
| goto err; |
| if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len)) |
| goto err; |
| |
| if (olen > (size_t)chunk) { |
| size_t mac_len; |
| if (!EVP_DigestSignFinal(ctx, out, &mac_len)) |
| goto err; |
| out += mac_len; |
| olen -= mac_len; |
| /* calc the next A1 value */ |
| if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len)) |
| goto err; |
| } else { /* last one */ |
| |
| if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) |
| goto err; |
| memcpy(out, A1, olen); |
| break; |
| } |
| } |
| ret = 1; |
| err: |
| EVP_PKEY_free(mac_key); |
| EVP_MD_CTX_free(ctx); |
| EVP_MD_CTX_free(ctx_tmp); |
| EVP_MD_CTX_free(ctx_init); |
| OPENSSL_cleanse(A1, sizeof(A1)); |
| return ret; |
| } |
| |
| static int tls1_prf_alg(const EVP_MD *md, |
| const unsigned char *sec, size_t slen, |
| const unsigned char *seed, size_t seed_len, |
| unsigned char *out, size_t olen) |
| { |
| |
| if (EVP_MD_type(md) == NID_md5_sha1) { |
| size_t i; |
| unsigned char *tmp; |
| if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1), |
| seed, seed_len, out, olen)) |
| return 0; |
| |
| tmp = OPENSSL_malloc(olen); |
| if (tmp == NULL) |
| return 0; |
| if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1), |
| seed, seed_len, tmp, olen)) { |
| OPENSSL_clear_free(tmp, olen); |
| return 0; |
| } |
| for (i = 0; i < olen; i++) |
| out[i] ^= tmp[i]; |
| OPENSSL_clear_free(tmp, olen); |
| return 1; |
| } |
| if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen)) |
| return 0; |
| |
| return 1; |
| } |
