2 * Copyright 2016-2018 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 if ((kctx = OPENSSL_zalloc(sizeof(*kctx))) == NULL) {
41 KDFerr(KDF_F_PKEY_TLS1_PRF_INIT, ERR_R_MALLOC_FAILURE);
49 static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx)
51 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
52 OPENSSL_clear_free(kctx->sec, kctx->seclen);
53 OPENSSL_cleanse(kctx->seed, kctx->seedlen);
57 static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
59 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
61 case EVP_PKEY_CTRL_TLS_MD:
65 case EVP_PKEY_CTRL_TLS_SECRET:
68 if (kctx->sec != NULL)
69 OPENSSL_clear_free(kctx->sec, kctx->seclen);
70 OPENSSL_cleanse(kctx->seed, kctx->seedlen);
72 kctx->sec = OPENSSL_memdup(p2, p1);
73 if (kctx->sec == NULL)
78 case EVP_PKEY_CTRL_TLS_SEED:
79 if (p1 == 0 || p2 == NULL)
81 if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen))
83 memcpy(kctx->seed + kctx->seedlen, p2, p1);
93 static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx,
94 const char *type, const char *value)
97 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING);
100 if (strcmp(type, "md") == 0) {
101 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
103 const EVP_MD *md = EVP_get_digestbyname(value);
105 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST);
111 if (strcmp(type, "secret") == 0)
112 return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
113 if (strcmp(type, "hexsecret") == 0)
114 return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SECRET, value);
115 if (strcmp(type, "seed") == 0)
116 return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
117 if (strcmp(type, "hexseed") == 0)
118 return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_TLS_SEED, value);
120 KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_UNKNOWN_PARAMETER_TYPE);
124 static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
127 TLS1_PRF_PKEY_CTX *kctx = ctx->data;
128 if (kctx->md == NULL) {
129 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_MESSAGE_DIGEST);
132 if (kctx->sec == NULL) {
133 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SECRET);
136 if (kctx->seedlen == 0) {
137 KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_SEED);
140 return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen,
141 kctx->seed, kctx->seedlen,
145 const EVP_PKEY_METHOD tls1_prf_pkey_meth = {
150 pkey_tls1_prf_cleanup,
170 pkey_tls1_prf_derive,
172 pkey_tls1_prf_ctrl_str
175 static int tls1_prf_P_hash(const EVP_MD *md,
176 const unsigned char *sec, size_t sec_len,
177 const unsigned char *seed, size_t seed_len,
178 unsigned char *out, size_t olen)
181 EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL;
182 EVP_PKEY *mac_key = NULL;
183 unsigned char A1[EVP_MAX_MD_SIZE];
187 chunk = EVP_MD_size(md);
188 if (!ossl_assert(chunk > 0))
191 ctx = EVP_MD_CTX_new();
192 ctx_tmp = EVP_MD_CTX_new();
193 ctx_init = EVP_MD_CTX_new();
194 if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL)
196 EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
197 mac_key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, sec, sec_len);
200 if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key))
202 if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
204 if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len))
206 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
210 /* Reinit mac contexts */
211 if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
213 if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
215 if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx))
217 if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len))
220 if (olen > (size_t)chunk) {
222 if (!EVP_DigestSignFinal(ctx, out, &mac_len))
226 /* calc the next A1 value */
227 if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len))
229 } else { /* last one */
231 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
233 memcpy(out, A1, olen);
239 EVP_PKEY_free(mac_key);
240 EVP_MD_CTX_free(ctx);
241 EVP_MD_CTX_free(ctx_tmp);
242 EVP_MD_CTX_free(ctx_init);
243 OPENSSL_cleanse(A1, sizeof(A1));
247 static int tls1_prf_alg(const EVP_MD *md,
248 const unsigned char *sec, size_t slen,
249 const unsigned char *seed, size_t seed_len,
250 unsigned char *out, size_t olen)
253 if (EVP_MD_type(md) == NID_md5_sha1) {
256 if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1),
257 seed, seed_len, out, olen))
260 if ((tmp = OPENSSL_malloc(olen)) == NULL) {
261 KDFerr(KDF_F_TLS1_PRF_ALG, ERR_R_MALLOC_FAILURE);
264 if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1),
265 seed, seed_len, tmp, olen)) {
266 OPENSSL_clear_free(tmp, olen);
269 for (i = 0; i < olen; i++)
271 OPENSSL_clear_free(tmp, olen);
274 if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen))