File openssl-fips-DH-Pair-wise-Consistency.patch of Package openssl-1_1

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File openssl-fips-DH-Pair-wise-Consistency.patch of Package openssl-1_1 (Revision f039df864f9fdf96785272dd1d4012ad)

Currently displaying revision f039df864f9fdf96785272dd1d4012ad , Show latest

---
 crypto/dh/dh_check.c |   35 +++++++++++++++++++++++++++++++++++
 crypto/dh/dh_key.c   |    7 +++++++
 crypto/dh/dh_local.h |    3 +++
 3 files changed, 45 insertions(+)

--- a/crypto/dh/dh_check.c
+++ b/crypto/dh/dh_check.c
@@ -263,3 +263,38 @@ int dh_check_pub_key_full(const DH *dh,
     return dh_check_pub_key_int(dh, q, pub_key, ret);
 }
 
+/*
+ * See SP800-56Ar3 Section 5.6.2.1.4 : Owner Assurance of Pair-wise Consistency.
+ */
+int dh_check_pairwise(const DH *dh)
+{
+    int ret = 0;
+    BN_CTX *ctx = NULL;
+    BN_MONT_CTX *mont = NULL;
+    BIGNUM *pub_key = NULL;
+
+    if (dh->p == NULL
+        || dh->g == NULL
+        || dh->priv_key == NULL
+        || dh->pub_key == NULL)
+        return 0;
+
+    ctx = BN_CTX_new();
+    if (ctx == NULL)
+        goto err;
+
+    pub_key = BN_new();
+    if (pub_key == NULL)
+        goto err;
+
+    /* recalculate the public key = (g ^ priv) mod p */
+    if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, dh->priv_key, dh->p, ctx, mont))
+        goto err;
+    /* check it matches the existing pubic_key */
+    ret = BN_cmp(pub_key, dh->pub_key) == 0;
+err:
+    BN_free(pub_key);
+    BN_CTX_free(ctx);
+    return ret;
+}
+
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -224,6 +224,13 @@ static int generate_key(DH *dh)
 
     dh->pub_key = pub_key;
     dh->priv_key = priv_key;
+    if (FIPS_mode()) {
+        if (!dh_check_pairwise(dh)) {
+            dh->pub_key = dh->priv_key = NULL;
+            DHerr(DH_F_GENERATE_KEY, DH_R_INVALID_PUBKEY);
+            goto err;
+        }
+    }
     ok = 1;
  err:
     if (ok != 1)
--- a/crypto/dh/dh_local.h
+++ b/crypto/dh/dh_local.h
@@ -65,3 +65,6 @@ int dh_get_known_q(const DH *dh, BIGNUM
 /* FIPS mode only check which requires nid set and looks up q based on it. */
 int dh_check_pub_key_full(const DH *dh, const BIGNUM *pub_key, int *ret);
 
+/* FIPS mode only check pairwise consistency of DH public key. */
+int dh_check_pairwise(const DH *dh);
+

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File openssl-fips-DH-Pair-wise-Consistency.patch of Package openssl-1_1 (Revision f039df864f9fdf96785272dd1d4012ad)

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