2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include <openssl/kdf.h>
13 #include <openssl/evp.h>
14 #include "internal/evp_int.h"
16 static int tls1_prf_alg(const EVP_MD *md,
17 const unsigned char *sec, size_t slen,
18 const unsigned char *seed, size_t seed_len,
19 unsigned char *out, size_t olen);
21 #define TLS1_PRF_MAXBUF 1024
23 /* TLS KDF pkey context structure */
26 /* Digest to use for PRF */
28 /* Secret value to use for PRF */
31 /* Buffer of concatenated seed data */
32 unsigned char seed[TLS1_PRF_MAXBUF];
36 static int pkey_tls1_prf_init(EVP_PKEY_CTX *ctx)
38 TLS1_PRF_PKEY_CTX *kctx;
40 kctx = OPENSSL_zalloc(sizeof(*kctx));
48 static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx)
50 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
51 OPENSSL_clear_free(kctx->sec, kctx->seclen);
52 OPENSSL_cleanse(kctx->seed, kctx->seedlen);
56 static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
58 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
60 case EVP_PKEY_CTRL_TLS_MD:
64 case EVP_PKEY_CTRL_TLS_SECRET:
67 if (kctx->sec != NULL)
68 OPENSSL_clear_free(kctx->sec, kctx->seclen);
69 OPENSSL_cleanse(kctx->seed, kctx->seedlen);
71 kctx->sec = OPENSSL_memdup(p2, p1);
72 if (kctx->sec == NULL)
77 case EVP_PKEY_CTRL_TLS_SEED:
78 if (p1 == 0 || p2 == NULL)
80 if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen))
82 memcpy(kctx->seed + kctx->seedlen, p2, p1);
92 static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx,
93 const char *type, const char *value)
96 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING);
99 if (strcmp(type, "md") == 0) {
100 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
102 const EVP_MD *md = EVP_get_digestbyname(value);
104 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST);
110 if (strcmp(type, "secret") == 0)
111 return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
112 if (strcmp(type, "hexsecret") == 0)
113 return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
114 if (strcmp(type, "seed") == 0)
115 return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
116 if (strcmp(type, "hexseed") == 0)
117 return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
119 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_UNKNOWN_PARAMETER_TYPE);
123 static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
126 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
127 if (kctx->md == NULL) {
128 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_MESSAGE_DIGEST);
131 if (kctx->sec == NULL) {
132 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SECRET);
135 if (kctx->seedlen == 0) {
136 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SEED);
139 return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen,
140 kctx->seed, kctx->seedlen,
144 const EVP_PKEY_METHOD tls1_prf_pkey_meth = {
149 pkey_tls1_prf_cleanup,
169 pkey_tls1_prf_derive,
171 pkey_tls1_prf_ctrl_str
174 static int tls1_prf_P_hash(const EVP_MD *md,
175 const unsigned char *sec, size_t sec_len,
176 const unsigned char *seed, size_t seed_len,
177 unsigned char *out, size_t olen)
180 EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL;
181 EVP_PKEY *mac_key = NULL;
182 unsigned char A1[EVP_MAX_MD_SIZE];
186 chunk = EVP_MD_size(md);
187 if (!ossl_assert(chunk > 0))
190 ctx = EVP_MD_CTX_new();
191 ctx_tmp = EVP_MD_CTX_new();
192 ctx_init = EVP_MD_CTX_new();
193 if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL)
195 EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
196 mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len);
199 if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key))
201 if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
203 if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len))
205 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
209 /* Reinit mac contexts */
210 if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
212 if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
214 if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx))
216 if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len))
219 if (olen > (size_t)chunk) {
221 if (!EVP_DigestSignFinal(ctx, out, &mac_len))
225 /* calc the next A1 value */
226 if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len))
228 } else { /* last one */
230 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
232 memcpy(out, A1, olen);
238 EVP_PKEY_free(mac_key);
239 EVP_MD_CTX_free(ctx);
240 EVP_MD_CTX_free(ctx_tmp);
241 EVP_MD_CTX_free(ctx_init);
242 OPENSSL_cleanse(A1, sizeof(A1));
246 static int tls1_prf_alg(const EVP_MD *md,
247 const unsigned char *sec, size_t slen,
248 const unsigned char *seed, size_t seed_len,
249 unsigned char *out, size_t olen)
252 if (EVP_MD_type(md) == NID_md5_sha1) {
255 if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1),
256 seed, seed_len, out, olen))
259 tmp = OPENSSL_malloc(olen);
262 if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1),
263 seed, seed_len, tmp, olen)) {
264 OPENSSL_clear_free(tmp, olen);
267 for (i = 0; i < olen; i++)
269 OPENSSL_clear_free(tmp, olen);
272 if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen))