Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 442 insertions, 0 deletions

diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/dsa/dsa_ossl.c b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/dsa/dsa_ossl.c
new file mode 100644
index 000000000..a983def64
--- /dev/null
+++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/dsa/dsa_ossl.c
@@ -0,0 +1,442 @@
+/*
+ * Copyright 1995-2019 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 "crypto/bn.h"
+#include <openssl/bn.h>
+#include <openssl/sha.h>
+#include "dsa_local.h"
+#include <openssl/asn1.h>
+
+static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
+static int dsa_sign_setup_no_digest(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+                                    BIGNUM **rp);
+static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+                          BIGNUM **rp, const unsigned char *dgst, int dlen);
+static int dsa_do_verify(const unsigned char *dgst, int dgst_len,
+                         DSA_SIG *sig, DSA *dsa);
+static int dsa_init(DSA *dsa);
+static int dsa_finish(DSA *dsa);
+static BIGNUM *dsa_mod_inverse_fermat(const BIGNUM *k, const BIGNUM *q,
+                                      BN_CTX *ctx);
+
+static DSA_METHOD openssl_dsa_meth = {
+    "OpenSSL DSA method",
+    dsa_do_sign,
+    dsa_sign_setup_no_digest,
+    dsa_do_verify,
+    NULL,                       /* dsa_mod_exp, */
+    NULL,                       /* dsa_bn_mod_exp, */
+    dsa_init,
+    dsa_finish,
+    DSA_FLAG_FIPS_METHOD,
+    NULL,
+    NULL,
+    NULL
+};
+
+static const DSA_METHOD *default_DSA_method = &openssl_dsa_meth;
+
+void DSA_set_default_method(const DSA_METHOD *meth)
+{
+    default_DSA_method = meth;
+}
+
+const DSA_METHOD *DSA_get_default_method(void)
+{
+    return default_DSA_method;
+}
+
+const DSA_METHOD *DSA_OpenSSL(void)
+{
+    return &openssl_dsa_meth;
+}
+
+static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
+{
+    BIGNUM *kinv = NULL;
+    BIGNUM *m, *blind, *blindm, *tmp;
+    BN_CTX *ctx = NULL;
+    int reason = ERR_R_BN_LIB;
+    DSA_SIG *ret = NULL;
+    int rv = 0;
+
+    if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) {
+        reason = DSA_R_MISSING_PARAMETERS;
+        goto err;
+    }
+    if (dsa->priv_key == NULL) {
+        reason = DSA_R_MISSING_PRIVATE_KEY;
+        goto err;
+    }
+
+    ret = DSA_SIG_new();
+    if (ret == NULL)
+        goto err;
+    ret->r = BN_new();
+    ret->s = BN_new();
+    if (ret->r == NULL || ret->s == NULL)
+        goto err;
+
+    ctx = BN_CTX_new();
+    if (ctx == NULL)
+        goto err;
+    m = BN_CTX_get(ctx);
+    blind = BN_CTX_get(ctx);
+    blindm = BN_CTX_get(ctx);
+    tmp = BN_CTX_get(ctx);
+    if (tmp == NULL)
+        goto err;
+
+ redo:
+    if (!dsa_sign_setup(dsa, ctx, &kinv, &ret->r, dgst, dlen))
+        goto err;
+
+    if (dlen > BN_num_bytes(dsa->q))
+        /*
+         * if the digest length is greater than the size of q use the
+         * BN_num_bits(dsa->q) leftmost bits of the digest, see fips 186-3,
+         * 4.2
+         */
+        dlen = BN_num_bytes(dsa->q);
+    if (BN_bin2bn(dgst, dlen, m) == NULL)
+        goto err;
+
+    /*
+     * The normal signature calculation is:
+     *
+     *   s := k^-1 * (m + r * priv_key) mod q
+     *
+     * We will blind this to protect against side channel attacks
+     *
+     *   s := blind^-1 * k^-1 * (blind * m + blind * r * priv_key) mod q
+     */
+
+    /* Generate a blinding value */
+    do {
+        if (!BN_priv_rand(blind, BN_num_bits(dsa->q) - 1,
+                          BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
+            goto err;
+    } while (BN_is_zero(blind));
+    BN_set_flags(blind, BN_FLG_CONSTTIME);
+    BN_set_flags(blindm, BN_FLG_CONSTTIME);
+    BN_set_flags(tmp, BN_FLG_CONSTTIME);
+
+    /* tmp := blind * priv_key * r mod q */
+    if (!BN_mod_mul(tmp, blind, dsa->priv_key, dsa->q, ctx))
+        goto err;
+    if (!BN_mod_mul(tmp, tmp, ret->r, dsa->q, ctx))
+        goto err;
+
+    /* blindm := blind * m mod q */
+    if (!BN_mod_mul(blindm, blind, m, dsa->q, ctx))
+        goto err;
+
+    /* s : = (blind * priv_key * r) + (blind * m) mod q */
+    if (!BN_mod_add_quick(ret->s, tmp, blindm, dsa->q))
+        goto err;
+
+    /* s := s * k^-1 mod q */
+    if (!BN_mod_mul(ret->s, ret->s, kinv, dsa->q, ctx))
+        goto err;
+
+    /* s:= s * blind^-1 mod q */
+    if (BN_mod_inverse(blind, blind, dsa->q, ctx) == NULL)
+        goto err;
+    if (!BN_mod_mul(ret->s, ret->s, blind, dsa->q, ctx))
+        goto err;
+
+    /*
+     * Redo if r or s is zero as required by FIPS 186-3: this is very
+     * unlikely.
+     */
+    if (BN_is_zero(ret->r) || BN_is_zero(ret->s))
+        goto redo;
+
+    rv = 1;
+
+ err:
+    if (rv == 0) {
+        DSAerr(DSA_F_DSA_DO_SIGN, reason);
+        DSA_SIG_free(ret);
+        ret = NULL;
+    }
+    BN_CTX_free(ctx);
+    BN_clear_free(kinv);
+    return ret;
+}
+
+static int dsa_sign_setup_no_digest(DSA *dsa, BN_CTX *ctx_in,
+                                    BIGNUM **kinvp, BIGNUM **rp)
+{
+    return dsa_sign_setup(dsa, ctx_in, kinvp, rp, NULL, 0);
+}
+
+static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+                          BIGNUM **kinvp, BIGNUM **rp,
+                          const unsigned char *dgst, int dlen)
+{
+    BN_CTX *ctx = NULL;
+    BIGNUM *k, *kinv = NULL, *r = *rp;
+    BIGNUM *l;
+    int ret = 0;
+    int q_bits, q_words;
+
+    if (!dsa->p || !dsa->q || !dsa->g) {
+        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PARAMETERS);
+        return 0;
+    }
+
+    /* Reject obviously invalid parameters */
+    if (BN_is_zero(dsa->p) || BN_is_zero(dsa->q) || BN_is_zero(dsa->g)) {
+        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_INVALID_PARAMETERS);
+        return 0;
+    }
+    if (dsa->priv_key == NULL) {
+        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PRIVATE_KEY);
+        return 0;
+    }
+
+    k = BN_new();
+    l = BN_new();
+    if (k == NULL || l == NULL)
+        goto err;
+
+    if (ctx_in == NULL) {
+        if ((ctx = BN_CTX_new()) == NULL)
+            goto err;
+    } else
+        ctx = ctx_in;
+
+    /* Preallocate space */
+    q_bits = BN_num_bits(dsa->q);
+    q_words = bn_get_top(dsa->q);
+    if (!bn_wexpand(k, q_words + 2)
+        || !bn_wexpand(l, q_words + 2))
+        goto err;
+
+    /* Get random k */
+    do {
+        if (dgst != NULL) {
+            /*
+             * We calculate k from SHA512(private_key + H(message) + random).
+             * This protects the private key from a weak PRNG.
+             */
+            if (!BN_generate_dsa_nonce(k, dsa->q, dsa->priv_key, dgst,
+                                       dlen, ctx))
+                goto err;
+        } else if (!BN_priv_rand_range(k, dsa->q))
+            goto err;
+    } while (BN_is_zero(k));
+
+    BN_set_flags(k, BN_FLG_CONSTTIME);
+    BN_set_flags(l, BN_FLG_CONSTTIME);
+
+    if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
+        if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
+                                    dsa->lock, dsa->p, ctx))
+            goto err;
+    }
+
+    /* Compute r = (g^k mod p) mod q */
+
+    /*
+     * We do not want timing information to leak the length of k, so we
+     * compute G^k using an equivalent scalar of fixed bit-length.
+     *
+     * We unconditionally perform both of these additions to prevent a
+     * small timing information leakage.  We then choose the sum that is
+     * one bit longer than the modulus.
+     *
+     * There are some concerns about the efficacy of doing this.  More
+     * specifically refer to the discussion starting with:
+     *     https://github.com/openssl/openssl/pull/7486#discussion_r228323705
+     * The fix is to rework BN so these gymnastics aren't required.
+     */
+    if (!BN_add(l, k, dsa->q)
+        || !BN_add(k, l, dsa->q))
+        goto err;
+
+    BN_consttime_swap(BN_is_bit_set(l, q_bits), k, l, q_words + 2);
+
+    if ((dsa)->meth->bn_mod_exp != NULL) {
+            if (!dsa->meth->bn_mod_exp(dsa, r, dsa->g, k, dsa->p, ctx,
+                                       dsa->method_mont_p))
+                goto err;
+    } else {
+            if (!BN_mod_exp_mont(r, dsa->g, k, dsa->p, ctx, dsa->method_mont_p))
+                goto err;
+    }
+
+    if (!BN_mod(r, r, dsa->q, ctx))
+        goto err;
+
+    /* Compute part of 's = inv(k) (m + xr) mod q' */
+    if ((kinv = dsa_mod_inverse_fermat(k, dsa->q, ctx)) == NULL)
+        goto err;
+
+    BN_clear_free(*kinvp);
+    *kinvp = kinv;
+    kinv = NULL;
+    ret = 1;
+ err:
+    if (!ret)
+        DSAerr(DSA_F_DSA_SIGN_SETUP, ERR_R_BN_LIB);
+    if (ctx != ctx_in)
+        BN_CTX_free(ctx);
+    BN_clear_free(k);
+    BN_clear_free(l);
+    return ret;
+}
+
+static int dsa_do_verify(const unsigned char *dgst, int dgst_len,
+                         DSA_SIG *sig, DSA *dsa)
+{
+    BN_CTX *ctx;
+    BIGNUM *u1, *u2, *t1;
+    BN_MONT_CTX *mont = NULL;
+    const BIGNUM *r, *s;
+    int ret = -1, i;
+    if (!dsa->p || !dsa->q || !dsa->g) {
+        DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_MISSING_PARAMETERS);
+        return -1;
+    }
+
+    i = BN_num_bits(dsa->q);
+    /* fips 186-3 allows only different sizes for q */
+    if (i != 160 && i != 224 && i != 256) {
+        DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_BAD_Q_VALUE);
+        return -1;
+    }
+
+    if (BN_num_bits(dsa->p) > OPENSSL_DSA_MAX_MODULUS_BITS) {
+        DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_MODULUS_TOO_LARGE);
+        return -1;
+    }
+    u1 = BN_new();
+    u2 = BN_new();
+    t1 = BN_new();
+    ctx = BN_CTX_new();
+    if (u1 == NULL || u2 == NULL || t1 == NULL || ctx == NULL)
+        goto err;
+
+    DSA_SIG_get0(sig, &r, &s);
+
+    if (BN_is_zero(r) || BN_is_negative(r) ||
+        BN_ucmp(r, dsa->q) >= 0) {
+        ret = 0;
+        goto err;
+    }
+    if (BN_is_zero(s) || BN_is_negative(s) ||
+        BN_ucmp(s, dsa->q) >= 0) {
+        ret = 0;
+        goto err;
+    }
+
+    /*
+     * Calculate W = inv(S) mod Q save W in u2
+     */
+    if ((BN_mod_inverse(u2, s, dsa->q, ctx)) == NULL)
+        goto err;
+
+    /* save M in u1 */
+    if (dgst_len > (i >> 3))
+        /*
+         * if the digest length is greater than the size of q use the
+         * BN_num_bits(dsa->q) leftmost bits of the digest, see fips 186-3,
+         * 4.2
+         */
+        dgst_len = (i >> 3);
+    if (BN_bin2bn(dgst, dgst_len, u1) == NULL)
+        goto err;
+
+    /* u1 = M * w mod q */
+    if (!BN_mod_mul(u1, u1, u2, dsa->q, ctx))
+        goto err;
+
+    /* u2 = r * w mod q */
+    if (!BN_mod_mul(u2, r, u2, dsa->q, ctx))
+        goto err;
+
+    if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
+        mont = BN_MONT_CTX_set_locked(&dsa->method_mont_p,
+                                      dsa->lock, dsa->p, ctx);
+        if (!mont)
+            goto err;
+    }
+
+    if (dsa->meth->dsa_mod_exp != NULL) {
+        if (!dsa->meth->dsa_mod_exp(dsa, t1, dsa->g, u1, dsa->pub_key, u2,
+                                    dsa->p, ctx, mont))
+            goto err;
+    } else {
+        if (!BN_mod_exp2_mont(t1, dsa->g, u1, dsa->pub_key, u2, dsa->p, ctx,
+                              mont))
+            goto err;
+    }
+
+    /* let u1 = u1 mod q */
+    if (!BN_mod(u1, t1, dsa->q, ctx))
+        goto err;
+
+    /*
+     * V is now in u1.  If the signature is correct, it will be equal to R.
+     */
+    ret = (BN_ucmp(u1, r) == 0);
+
+ err:
+    if (ret < 0)
+        DSAerr(DSA_F_DSA_DO_VERIFY, ERR_R_BN_LIB);
+    BN_CTX_free(ctx);
+    BN_free(u1);
+    BN_free(u2);
+    BN_free(t1);
+    return ret;
+}
+
+static int dsa_init(DSA *dsa)
+{
+    dsa->flags |= DSA_FLAG_CACHE_MONT_P;
+    return 1;
+}
+
+static int dsa_finish(DSA *dsa)
+{
+    BN_MONT_CTX_free(dsa->method_mont_p);
+    return 1;
+}
+
+/*
+ * Compute the inverse of k modulo q.
+ * Since q is prime, Fermat's Little Theorem applies, which reduces this to
+ * mod-exp operation.  Both the exponent and modulus are public information
+ * so a mod-exp that doesn't leak the base is sufficient.  A newly allocated
+ * BIGNUM is returned which the caller must free.
+ */
+static BIGNUM *dsa_mod_inverse_fermat(const BIGNUM *k, const BIGNUM *q,
+                                      BN_CTX *ctx)
+{
+    BIGNUM *res = NULL;
+    BIGNUM *r, *e;
+
+    if ((r = BN_new()) == NULL)
+        return NULL;
+
+    BN_CTX_start(ctx);
+    if ((e = BN_CTX_get(ctx)) != NULL
+            && BN_set_word(r, 2)
+            && BN_sub(e, q, r)
+            && BN_mod_exp_mont(r, k, e, q, ctx, NULL))
+        res = r;
+    else
+        BN_free(r);
+    BN_CTX_end(ctx);
+    return res;
+}