mirror of
https://github.com/openssl/openssl.git
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aa291c62a7
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
284 lines
8.5 KiB
C
284 lines
8.5 KiB
C
/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 2016.
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*/
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/* ====================================================================
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* Copyright (c) 2015 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/kdf.h>
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#include <openssl/evp.h>
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#include "internal/evp_int.h"
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static int tls1_prf_alg(const EVP_MD *md,
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const unsigned char *sec, size_t slen,
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const unsigned char *seed, size_t seed_len,
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unsigned char *out, size_t olen);
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#define TLS1_PRF_MAXBUF 1024
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/* TLS KDF pkey context structure */
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typedef struct {
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/* Digest to use for PRF */
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const EVP_MD *md;
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/* Secret value to use for PRF */
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unsigned char *sec;
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size_t seclen;
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/* Buffer of concatenated seed data */
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unsigned char seed[TLS1_PRF_MAXBUF];
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size_t seedlen;
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} TLS1_PRF_PKEY_CTX;
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static int pkey_tls1_prf_init(EVP_PKEY_CTX *ctx)
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{
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TLS1_PRF_PKEY_CTX *kctx;
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kctx = OPENSSL_zalloc(sizeof(*kctx));
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if (kctx == NULL)
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return 0;
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ctx->data = kctx;
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return 1;
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}
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static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx)
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{
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TLS1_PRF_PKEY_CTX *kctx = ctx->data;
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OPENSSL_clear_free(kctx->sec, kctx->seclen);
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OPENSSL_cleanse(kctx->seed, kctx->seedlen);
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OPENSSL_free(kctx);
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}
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static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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TLS1_PRF_PKEY_CTX *kctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_TLS_MD:
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kctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_TLS_SECRET:
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if (p1 < 0)
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return 0;
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if (kctx->sec != NULL)
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OPENSSL_clear_free(kctx->sec, kctx->seclen);
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OPENSSL_cleanse(kctx->seed, kctx->seedlen);
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kctx->seedlen = 0;
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kctx->sec = OPENSSL_memdup(p2, p1);
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if (kctx->sec == NULL)
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return 0;
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kctx->seclen = p1;
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return 1;
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case EVP_PKEY_CTRL_TLS_SEED:
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if (p1 == 0 || p2 == NULL)
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return 1;
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if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen))
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return 0;
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memcpy(kctx->seed + kctx->seedlen, p2, p1);
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kctx->seedlen += p1;
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return 1;
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default:
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return -2;
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}
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}
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static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
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size_t *keylen)
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{
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TLS1_PRF_PKEY_CTX *kctx = ctx->data;
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if (kctx->md == NULL || kctx->sec == NULL || kctx->seedlen == 0)
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return 0;
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return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen,
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kctx->seed, kctx->seedlen,
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key, *keylen);
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}
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const EVP_PKEY_METHOD tls1_prf_pkey_meth = {
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EVP_PKEY_TLS1_PRF,
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0,
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pkey_tls1_prf_init,
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0,
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pkey_tls1_prf_cleanup,
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0, 0,
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0, 0,
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0,
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0,
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0,
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0,
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0, 0,
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0, 0, 0, 0,
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0, 0,
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0, 0,
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0,
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pkey_tls1_prf_derive,
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pkey_tls1_prf_ctrl,
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0
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};
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static int tls1_prf_P_hash(const EVP_MD *md,
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const unsigned char *sec, size_t sec_len,
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const unsigned char *seed, size_t seed_len,
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unsigned char *out, size_t olen)
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{
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int chunk;
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EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL;
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EVP_PKEY *mac_key = NULL;
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unsigned char A1[EVP_MAX_MD_SIZE];
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size_t A1_len;
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int ret = 0;
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chunk = EVP_MD_size(md);
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OPENSSL_assert(chunk >= 0);
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ctx = EVP_MD_CTX_new();
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ctx_tmp = EVP_MD_CTX_new();
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ctx_init = EVP_MD_CTX_new();
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if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL)
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goto err;
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EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len);
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if (mac_key == NULL)
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goto err;
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if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key))
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goto err;
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if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
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goto err;
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if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len))
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goto err;
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if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
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goto err;
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for (;;) {
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/* Reinit mac contexts */
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if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
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goto err;
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if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
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goto err;
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if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx))
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goto err;
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if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len))
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goto err;
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if (olen > (size_t)chunk) {
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size_t mac_len;
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if (!EVP_DigestSignFinal(ctx, out, &mac_len))
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goto err;
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out += mac_len;
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olen -= mac_len;
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/* calc the next A1 value */
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if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len))
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goto err;
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} else { /* last one */
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if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
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goto err;
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memcpy(out, A1, olen);
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break;
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}
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}
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ret = 1;
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err:
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EVP_PKEY_free(mac_key);
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EVP_MD_CTX_free(ctx);
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EVP_MD_CTX_free(ctx_tmp);
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EVP_MD_CTX_free(ctx_init);
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OPENSSL_cleanse(A1, sizeof(A1));
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return ret;
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}
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static int tls1_prf_alg(const EVP_MD *md,
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const unsigned char *sec, size_t slen,
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const unsigned char *seed, size_t seed_len,
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unsigned char *out, size_t olen)
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{
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if (EVP_MD_type(md) == NID_md5_sha1) {
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size_t i;
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unsigned char *tmp;
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if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1),
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seed, seed_len, out, olen))
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return 0;
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tmp = OPENSSL_malloc(olen);
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if (tmp == NULL)
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return 0;
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if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1),
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seed, seed_len, tmp, olen)) {
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OPENSSL_clear_free(tmp, olen);
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return 0;
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}
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for (i = 0; i < olen; i++)
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out[i] ^= tmp[i];
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OPENSSL_clear_free(tmp, olen);
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return 1;
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}
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if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen))
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return 0;
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return 1;
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}
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