--- /dev/null
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#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;
+}
projects / cassiopeia.git / blobdiff