From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/dh/dh_kdf.c | 150 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 openssl-1.1.0h/crypto/dh/dh_kdf.c

(limited to 'openssl-1.1.0h/crypto/dh/dh_kdf.c')

diff --git a/openssl-1.1.0h/crypto/dh/dh_kdf.c b/openssl-1.1.0h/crypto/dh/dh_kdf.c
new file mode 100644
index 0000000..2782eee
--- /dev/null
+++ b/openssl-1.1.0h/crypto/dh/dh_kdf.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2013-2016 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 <e_os.h>
+
+#ifndef OPENSSL_NO_CMS
+#include <string.h>
+#include <openssl/dh.h>
+#include <openssl/evp.h>
+#include <openssl/asn1.h>
+#include <openssl/cms.h>
+
+
+/* Key derivation from X9.42/RFC2631 */
+/* Uses CMS functions, hence the #ifdef wrapper. */
+
+#define DH_KDF_MAX      (1L << 30)
+
+/* Skip past an ASN1 structure: for OBJECT skip content octets too */
+
+static int skip_asn1(unsigned char **pp, long *plen, int exptag)
+{
+    const unsigned char *q = *pp;
+    int i, tag, xclass;
+    long tmplen;
+    i = ASN1_get_object(&q, &tmplen, &tag, &xclass, *plen);
+    if (i & 0x80)
+        return 0;
+    if (tag != exptag || xclass != V_ASN1_UNIVERSAL)
+        return 0;
+    if (tag == V_ASN1_OBJECT)
+        q += tmplen;
+    *plen -= q - *pp;
+    *pp = (unsigned char *)q;
+    return 1;
+}
+
+/*
+ * Encode the DH shared info structure, return an offset to the counter value
+ * so we can update the structure without reencoding it.
+ */
+
+static int dh_sharedinfo_encode(unsigned char **pder, unsigned char **pctr,
+                                ASN1_OBJECT *key_oid, size_t outlen,
+                                const unsigned char *ukm, size_t ukmlen)
+{
+    unsigned char *p;
+    int derlen;
+    long tlen;
+    /* "magic" value to check offset is sane */
+    static unsigned char ctr[4] = { 0xF3, 0x17, 0x22, 0x53 };
+    X509_ALGOR atmp;
+    ASN1_OCTET_STRING ctr_oct, ukm_oct, *pukm_oct;
+    ASN1_TYPE ctr_atype;
+    if (ukmlen > DH_KDF_MAX || outlen > DH_KDF_MAX)
+        return 0;
+    ctr_oct.data = ctr;
+    ctr_oct.length = 4;
+    ctr_oct.flags = 0;
+    ctr_oct.type = V_ASN1_OCTET_STRING;
+    ctr_atype.type = V_ASN1_OCTET_STRING;
+    ctr_atype.value.octet_string = &ctr_oct;
+    atmp.algorithm = key_oid;
+    atmp.parameter = &ctr_atype;
+    if (ukm) {
+        ukm_oct.type = V_ASN1_OCTET_STRING;
+        ukm_oct.flags = 0;
+        ukm_oct.data = (unsigned char *)ukm;
+        ukm_oct.length = ukmlen;
+        pukm_oct = &ukm_oct;
+    } else
+        pukm_oct = NULL;
+    derlen = CMS_SharedInfo_encode(pder, &atmp, pukm_oct, outlen);
+    if (derlen <= 0)
+        return 0;
+    p = *pder;
+    tlen = derlen;
+    if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
+        return 0;
+    if (!skip_asn1(&p, &tlen, V_ASN1_SEQUENCE))
+        return 0;
+    if (!skip_asn1(&p, &tlen, V_ASN1_OBJECT))
+        return 0;
+    if (!skip_asn1(&p, &tlen, V_ASN1_OCTET_STRING))
+        return 0;
+    if (CRYPTO_memcmp(p, ctr, 4))
+        return 0;
+    *pctr = p;
+    return derlen;
+}
+
+int DH_KDF_X9_42(unsigned char *out, size_t outlen,
+                 const unsigned char *Z, size_t Zlen,
+                 ASN1_OBJECT *key_oid,
+                 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
+{
+    EVP_MD_CTX *mctx = NULL;
+    int rv = 0;
+    unsigned int i;
+    size_t mdlen;
+    unsigned char *der = NULL, *ctr;
+    int derlen;
+    if (Zlen > DH_KDF_MAX)
+        return 0;
+    mctx = EVP_MD_CTX_new();
+    if (mctx == NULL)
+        return 0;
+    mdlen = EVP_MD_size(md);
+    derlen = dh_sharedinfo_encode(&der, &ctr, key_oid, outlen, ukm, ukmlen);
+    if (derlen == 0)
+        goto err;
+    for (i = 1;; i++) {
+        unsigned char mtmp[EVP_MAX_MD_SIZE];
+        if (!EVP_DigestInit_ex(mctx, md, NULL)
+            || !EVP_DigestUpdate(mctx, Z, Zlen))
+            goto err;
+        ctr[3] = i & 0xFF;
+        ctr[2] = (i >> 8) & 0xFF;
+        ctr[1] = (i >> 16) & 0xFF;
+        ctr[0] = (i >> 24) & 0xFF;
+        if (!EVP_DigestUpdate(mctx, der, derlen))
+            goto err;
+        if (outlen >= mdlen) {
+            if (!EVP_DigestFinal(mctx, out, NULL))
+                goto err;
+            outlen -= mdlen;
+            if (outlen == 0)
+                break;
+            out += mdlen;
+        } else {
+            if (!EVP_DigestFinal(mctx, mtmp, NULL))
+                goto err;
+            memcpy(out, mtmp, outlen);
+            OPENSSL_cleanse(mtmp, mdlen);
+            break;
+        }
+    }
+    rv = 1;
+ err:
+    OPENSSL_free(der);
+    EVP_MD_CTX_free(mctx);
+    return rv;
+}
+#endif
-- 
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