[331] | 1 | /*
|
---|
| 2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
|
---|
| 3 | *
|
---|
| 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
|
---|
| 8 | */
|
---|
| 9 |
|
---|
| 10 | #include <stdio.h>
|
---|
| 11 | #include "internal/cryptlib.h"
|
---|
| 12 | #include <openssl/kdf.h>
|
---|
| 13 | #include <openssl/evp.h>
|
---|
| 14 | #include "internal/evp_int.h"
|
---|
| 15 |
|
---|
| 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);
|
---|
| 20 |
|
---|
| 21 | #define TLS1_PRF_MAXBUF 1024
|
---|
| 22 |
|
---|
| 23 | /* TLS KDF pkey context structure */
|
---|
| 24 |
|
---|
| 25 | typedef struct {
|
---|
| 26 | /* Digest to use for PRF */
|
---|
| 27 | const EVP_MD *md;
|
---|
| 28 | /* Secret value to use for PRF */
|
---|
| 29 | unsigned char *sec;
|
---|
| 30 | size_t seclen;
|
---|
| 31 | /* Buffer of concatenated seed data */
|
---|
| 32 | unsigned char seed[TLS1_PRF_MAXBUF];
|
---|
| 33 | size_t seedlen;
|
---|
| 34 | } TLS1_PRF_PKEY_CTX;
|
---|
| 35 |
|
---|
| 36 | static int pkey_tls1_prf_init(EVP_PKEY_CTX *ctx)
|
---|
| 37 | {
|
---|
| 38 | TLS1_PRF_PKEY_CTX *kctx;
|
---|
| 39 |
|
---|
| 40 | kctx = OPENSSL_zalloc(sizeof(*kctx));
|
---|
| 41 | if (kctx == NULL)
|
---|
| 42 | return 0;
|
---|
| 43 | ctx->data = kctx;
|
---|
| 44 |
|
---|
| 45 | return 1;
|
---|
| 46 | }
|
---|
| 47 |
|
---|
| 48 | static void pkey_tls1_prf_cleanup(EVP_PKEY_CTX *ctx)
|
---|
| 49 | {
|
---|
| 50 | TLS1_PRF_PKEY_CTX *kctx = ctx->data;
|
---|
| 51 | OPENSSL_clear_free(kctx->sec, kctx->seclen);
|
---|
| 52 | OPENSSL_cleanse(kctx->seed, kctx->seedlen);
|
---|
| 53 | OPENSSL_free(kctx);
|
---|
| 54 | }
|
---|
| 55 |
|
---|
| 56 | static int pkey_tls1_prf_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
|
---|
| 57 | {
|
---|
| 58 | TLS1_PRF_PKEY_CTX *kctx = ctx->data;
|
---|
| 59 | switch (type) {
|
---|
| 60 | case EVP_PKEY_CTRL_TLS_MD:
|
---|
| 61 | kctx->md = p2;
|
---|
| 62 | return 1;
|
---|
| 63 |
|
---|
| 64 | case EVP_PKEY_CTRL_TLS_SECRET:
|
---|
| 65 | if (p1 < 0)
|
---|
| 66 | return 0;
|
---|
| 67 | if (kctx->sec != NULL)
|
---|
| 68 | OPENSSL_clear_free(kctx->sec, kctx->seclen);
|
---|
| 69 | OPENSSL_cleanse(kctx->seed, kctx->seedlen);
|
---|
| 70 | kctx->seedlen = 0;
|
---|
| 71 | kctx->sec = OPENSSL_memdup(p2, p1);
|
---|
| 72 | if (kctx->sec == NULL)
|
---|
| 73 | return 0;
|
---|
| 74 | kctx->seclen = p1;
|
---|
| 75 | return 1;
|
---|
| 76 |
|
---|
| 77 | case EVP_PKEY_CTRL_TLS_SEED:
|
---|
| 78 | if (p1 == 0 || p2 == NULL)
|
---|
| 79 | return 1;
|
---|
| 80 | if (p1 < 0 || p1 > (int)(TLS1_PRF_MAXBUF - kctx->seedlen))
|
---|
| 81 | return 0;
|
---|
| 82 | memcpy(kctx->seed + kctx->seedlen, p2, p1);
|
---|
| 83 | kctx->seedlen += p1;
|
---|
| 84 | return 1;
|
---|
| 85 |
|
---|
| 86 | default:
|
---|
| 87 | return -2;
|
---|
| 88 |
|
---|
| 89 | }
|
---|
| 90 | }
|
---|
| 91 |
|
---|
| 92 | static int pkey_tls1_prf_ctrl_str(EVP_PKEY_CTX *ctx,
|
---|
| 93 | const char *type, const char *value)
|
---|
| 94 | {
|
---|
| 95 | if (value == NULL) {
|
---|
| 96 | KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_VALUE_MISSING);
|
---|
| 97 | return 0;
|
---|
| 98 | }
|
---|
| 99 | if (strcmp(type, "md") == 0) {
|
---|
| 100 | TLS1_PRF_PKEY_CTX *kctx = ctx->data;
|
---|
| 101 |
|
---|
| 102 | const EVP_MD *md = EVP_get_digestbyname(value);
|
---|
| 103 | if (md == NULL) {
|
---|
| 104 | KDFerr(KDF_F_PKEY_TLS1_PRF_CTRL_STR, KDF_R_INVALID_DIGEST);
|
---|
| 105 | return 0;
|
---|
| 106 | }
|
---|
| 107 | kctx->md = md;
|
---|
| 108 | return 1;
|
---|
| 109 | }
|
---|
| 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);
|
---|
| 118 | return -2;
|
---|
| 119 | }
|
---|
| 120 |
|
---|
| 121 | static int pkey_tls1_prf_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
|
---|
| 122 | size_t *keylen)
|
---|
| 123 | {
|
---|
| 124 | TLS1_PRF_PKEY_CTX *kctx = ctx->data;
|
---|
| 125 | if (kctx->md == NULL || kctx->sec == NULL || kctx->seedlen == 0) {
|
---|
| 126 | KDFerr(KDF_F_PKEY_TLS1_PRF_DERIVE, KDF_R_MISSING_PARAMETER);
|
---|
| 127 | return 0;
|
---|
| 128 | }
|
---|
| 129 | return tls1_prf_alg(kctx->md, kctx->sec, kctx->seclen,
|
---|
| 130 | kctx->seed, kctx->seedlen,
|
---|
| 131 | key, *keylen);
|
---|
| 132 | }
|
---|
| 133 |
|
---|
| 134 | const EVP_PKEY_METHOD tls1_prf_pkey_meth = {
|
---|
| 135 | EVP_PKEY_TLS1_PRF,
|
---|
| 136 | 0,
|
---|
| 137 | pkey_tls1_prf_init,
|
---|
| 138 | 0,
|
---|
| 139 | pkey_tls1_prf_cleanup,
|
---|
| 140 |
|
---|
| 141 | 0, 0,
|
---|
| 142 | 0, 0,
|
---|
| 143 |
|
---|
| 144 | 0,
|
---|
| 145 | 0,
|
---|
| 146 |
|
---|
| 147 | 0,
|
---|
| 148 | 0,
|
---|
| 149 |
|
---|
| 150 | 0, 0,
|
---|
| 151 |
|
---|
| 152 | 0, 0, 0, 0,
|
---|
| 153 |
|
---|
| 154 | 0, 0,
|
---|
| 155 |
|
---|
| 156 | 0, 0,
|
---|
| 157 |
|
---|
| 158 | 0,
|
---|
| 159 | pkey_tls1_prf_derive,
|
---|
| 160 | pkey_tls1_prf_ctrl,
|
---|
| 161 | pkey_tls1_prf_ctrl_str
|
---|
| 162 | };
|
---|
| 163 |
|
---|
| 164 | static int tls1_prf_P_hash(const EVP_MD *md,
|
---|
| 165 | const unsigned char *sec, size_t sec_len,
|
---|
| 166 | const unsigned char *seed, size_t seed_len,
|
---|
| 167 | unsigned char *out, size_t olen)
|
---|
| 168 | {
|
---|
| 169 | int chunk;
|
---|
| 170 | EVP_MD_CTX *ctx = NULL, *ctx_tmp = NULL, *ctx_init = NULL;
|
---|
| 171 | EVP_PKEY *mac_key = NULL;
|
---|
| 172 | unsigned char A1[EVP_MAX_MD_SIZE];
|
---|
| 173 | size_t A1_len;
|
---|
| 174 | int ret = 0;
|
---|
| 175 |
|
---|
| 176 | chunk = EVP_MD_size(md);
|
---|
| 177 | OPENSSL_assert(chunk >= 0);
|
---|
| 178 |
|
---|
| 179 | ctx = EVP_MD_CTX_new();
|
---|
| 180 | ctx_tmp = EVP_MD_CTX_new();
|
---|
| 181 | ctx_init = EVP_MD_CTX_new();
|
---|
| 182 | if (ctx == NULL || ctx_tmp == NULL || ctx_init == NULL)
|
---|
| 183 | goto err;
|
---|
| 184 | EVP_MD_CTX_set_flags(ctx_init, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
|
---|
| 185 | mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len);
|
---|
| 186 | if (mac_key == NULL)
|
---|
| 187 | goto err;
|
---|
| 188 | if (!EVP_DigestSignInit(ctx_init, NULL, md, NULL, mac_key))
|
---|
| 189 | goto err;
|
---|
| 190 | if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
|
---|
| 191 | goto err;
|
---|
| 192 | if (seed != NULL && !EVP_DigestSignUpdate(ctx, seed, seed_len))
|
---|
| 193 | goto err;
|
---|
| 194 | if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
|
---|
| 195 | goto err;
|
---|
| 196 |
|
---|
| 197 | for (;;) {
|
---|
| 198 | /* Reinit mac contexts */
|
---|
| 199 | if (!EVP_MD_CTX_copy_ex(ctx, ctx_init))
|
---|
| 200 | goto err;
|
---|
| 201 | if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
|
---|
| 202 | goto err;
|
---|
| 203 | if (olen > (size_t)chunk && !EVP_MD_CTX_copy_ex(ctx_tmp, ctx))
|
---|
| 204 | goto err;
|
---|
| 205 | if (seed && !EVP_DigestSignUpdate(ctx, seed, seed_len))
|
---|
| 206 | goto err;
|
---|
| 207 |
|
---|
| 208 | if (olen > (size_t)chunk) {
|
---|
| 209 | size_t mac_len;
|
---|
| 210 | if (!EVP_DigestSignFinal(ctx, out, &mac_len))
|
---|
| 211 | goto err;
|
---|
| 212 | out += mac_len;
|
---|
| 213 | olen -= mac_len;
|
---|
| 214 | /* calc the next A1 value */
|
---|
| 215 | if (!EVP_DigestSignFinal(ctx_tmp, A1, &A1_len))
|
---|
| 216 | goto err;
|
---|
| 217 | } else { /* last one */
|
---|
| 218 |
|
---|
| 219 | if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
|
---|
| 220 | goto err;
|
---|
| 221 | memcpy(out, A1, olen);
|
---|
| 222 | break;
|
---|
| 223 | }
|
---|
| 224 | }
|
---|
| 225 | ret = 1;
|
---|
| 226 | err:
|
---|
| 227 | EVP_PKEY_free(mac_key);
|
---|
| 228 | EVP_MD_CTX_free(ctx);
|
---|
| 229 | EVP_MD_CTX_free(ctx_tmp);
|
---|
| 230 | EVP_MD_CTX_free(ctx_init);
|
---|
| 231 | OPENSSL_cleanse(A1, sizeof(A1));
|
---|
| 232 | return ret;
|
---|
| 233 | }
|
---|
| 234 |
|
---|
| 235 | static int tls1_prf_alg(const EVP_MD *md,
|
---|
| 236 | const unsigned char *sec, size_t slen,
|
---|
| 237 | const unsigned char *seed, size_t seed_len,
|
---|
| 238 | unsigned char *out, size_t olen)
|
---|
| 239 | {
|
---|
| 240 |
|
---|
| 241 | if (EVP_MD_type(md) == NID_md5_sha1) {
|
---|
| 242 | size_t i;
|
---|
| 243 | unsigned char *tmp;
|
---|
| 244 | if (!tls1_prf_P_hash(EVP_md5(), sec, slen/2 + (slen & 1),
|
---|
| 245 | seed, seed_len, out, olen))
|
---|
| 246 | return 0;
|
---|
| 247 |
|
---|
| 248 | tmp = OPENSSL_malloc(olen);
|
---|
| 249 | if (tmp == NULL)
|
---|
| 250 | return 0;
|
---|
| 251 | if (!tls1_prf_P_hash(EVP_sha1(), sec + slen/2, slen/2 + (slen & 1),
|
---|
| 252 | seed, seed_len, tmp, olen)) {
|
---|
| 253 | OPENSSL_clear_free(tmp, olen);
|
---|
| 254 | return 0;
|
---|
| 255 | }
|
---|
| 256 | for (i = 0; i < olen; i++)
|
---|
| 257 | out[i] ^= tmp[i];
|
---|
| 258 | OPENSSL_clear_free(tmp, olen);
|
---|
| 259 | return 1;
|
---|
| 260 | }
|
---|
| 261 | if (!tls1_prf_P_hash(md, sec, slen, seed, seed_len, out, olen))
|
---|
| 262 | return 0;
|
---|
| 263 |
|
---|
| 264 | return 1;
|
---|
| 265 | }
|
---|