initial/final commitHEADmaster

1 files changed, 476 insertions, 0 deletions

diff --git a/openssl-1.1.0h/crypto/ec/ecdsa_ossl.c b/openssl-1.1.0h/crypto/ec/ecdsa_ossl.c
new file mode 100644
index 0000000..72e2f0f
--- /dev/null
+++ b/openssl-1.1.0h/crypto/ec/ecdsa_ossl.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright 2002-2017 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 <string.h>
+#include <openssl/err.h>
+#include <openssl/obj_mac.h>
+#include <openssl/bn.h>
+#include <openssl/rand.h>
+#include <openssl/ec.h>
+#include "ec_lcl.h"
+
+int ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen,
+                    unsigned char *sig, unsigned int *siglen,
+                    const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey)
+{
+    ECDSA_SIG *s;
+    RAND_seed(dgst, dlen);
+    s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey);
+    if (s == NULL) {
+        *siglen = 0;
+        return 0;
+    }
+    *siglen = i2d_ECDSA_SIG(s, &sig);
+    ECDSA_SIG_free(s);
+    return 1;
+}
+
+static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
+                            BIGNUM **kinvp, BIGNUM **rp,
+                            const unsigned char *dgst, int dlen)
+{
+    BN_CTX *ctx = NULL;
+    BIGNUM *k = NULL, *r = NULL, *X = NULL;
+    const BIGNUM *order;
+    EC_POINT *tmp_point = NULL;
+    const EC_GROUP *group;
+    int ret = 0;
+    int order_bits;
+
+    if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
+        return 0;
+    }
+
+    if (!EC_KEY_can_sign(eckey)) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
+        return 0;
+    }
+
+    if (ctx_in == NULL) {
+        if ((ctx = BN_CTX_new()) == NULL) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+            return 0;
+        }
+    } else
+        ctx = ctx_in;
+
+    k = BN_new();               /* this value is later returned in *kinvp */
+    r = BN_new();               /* this value is later returned in *rp */
+    X = BN_new();
+    if (k == NULL || r == NULL || X == NULL) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    if ((tmp_point = EC_POINT_new(group)) == NULL) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+        goto err;
+    }
+    order = EC_GROUP_get0_order(group);
+    if (order == NULL) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+        goto err;
+    }
+
+    /* Preallocate space */
+    order_bits = BN_num_bits(order);
+    if (!BN_set_bit(k, order_bits)
+        || !BN_set_bit(r, order_bits)
+        || !BN_set_bit(X, order_bits))
+        goto err;
+
+    do {
+        /* get random k */
+        do
+            if (dgst != NULL) {
+                if (!BN_generate_dsa_nonce
+                    (k, order, EC_KEY_get0_private_key(eckey), dgst, dlen,
+                     ctx)) {
+                    ECerr(EC_F_ECDSA_SIGN_SETUP,
+                             EC_R_RANDOM_NUMBER_GENERATION_FAILED);
+                    goto err;
+                }
+            } else {
+                if (!BN_rand_range(k, order)) {
+                    ECerr(EC_F_ECDSA_SIGN_SETUP,
+                             EC_R_RANDOM_NUMBER_GENERATION_FAILED);
+                    goto err;
+                }
+            }
+        while (BN_is_zero(k));
+
+        /*
+         * 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 order.  This guarantees the code
+         * path used in the constant time implementations elsewhere.
+         *
+         * TODO: revisit the BN_copy aiming for a memory access agnostic
+         * conditional copy.
+         */
+        if (!BN_add(r, k, order)
+            || !BN_add(X, r, order)
+            || !BN_copy(k, BN_num_bits(r) > order_bits ? r : X))
+            goto err;
+
+        /* compute r the x-coordinate of generator * k */
+        if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+            goto err;
+        }
+        if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
+            NID_X9_62_prime_field) {
+            if (!EC_POINT_get_affine_coordinates_GFp
+                (group, tmp_point, X, NULL, ctx)) {
+                ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+                goto err;
+            }
+        }
+#ifndef OPENSSL_NO_EC2M
+        else {                  /* NID_X9_62_characteristic_two_field */
+
+            if (!EC_POINT_get_affine_coordinates_GF2m(group,
+                                                      tmp_point, X, NULL,
+                                                      ctx)) {
+                ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);
+                goto err;
+            }
+        }
+#endif
+        if (!BN_nnmod(r, X, order, ctx)) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+            goto err;
+        }
+    }
+    while (BN_is_zero(r));
+
+    /* compute the inverse of k */
+    if (EC_GROUP_get_mont_data(group) != NULL) {
+        /*
+         * We want inverse in constant time, therefore we utilize the fact
+         * order must be prime and use Fermats Little Theorem instead.
+         */
+        if (!BN_set_word(X, 2)) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+            goto err;
+        }
+        if (!BN_mod_sub(X, order, X, order, ctx)) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+            goto err;
+        }
+        BN_set_flags(X, BN_FLG_CONSTTIME);
+        if (!BN_mod_exp_mont_consttime
+            (k, k, X, order, ctx, EC_GROUP_get_mont_data(group))) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+            goto err;
+        }
+    } else {
+        if (!BN_mod_inverse(k, k, order, ctx)) {
+            ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_BN_LIB);
+            goto err;
+        }
+    }
+
+    /* clear old values if necessary */
+    BN_clear_free(*rp);
+    BN_clear_free(*kinvp);
+    /* save the pre-computed values  */
+    *rp = r;
+    *kinvp = k;
+    ret = 1;
+ err:
+    if (!ret) {
+        BN_clear_free(k);
+        BN_clear_free(r);
+    }
+    if (ctx != ctx_in)
+        BN_CTX_free(ctx);
+    EC_POINT_free(tmp_point);
+    BN_clear_free(X);
+    return (ret);
+}
+
+int ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
+                          BIGNUM **rp)
+{
+    return ecdsa_sign_setup(eckey, ctx_in, kinvp, rp, NULL, 0);
+}
+
+ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
+                               const BIGNUM *in_kinv, const BIGNUM *in_r,
+                               EC_KEY *eckey)
+{
+    int ok = 0, i;
+    BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL;
+    const BIGNUM *order, *ckinv;
+    BN_CTX *ctx = NULL;
+    const EC_GROUP *group;
+    ECDSA_SIG *ret;
+    const BIGNUM *priv_key;
+
+    group = EC_KEY_get0_group(eckey);
+    priv_key = EC_KEY_get0_private_key(eckey);
+
+    if (group == NULL || priv_key == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_PASSED_NULL_PARAMETER);
+        return NULL;
+    }
+
+    if (!EC_KEY_can_sign(eckey)) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
+        return NULL;
+    }
+
+    ret = ECDSA_SIG_new();
+    if (ret == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+    ret->r = BN_new();
+    ret->s = BN_new();
+    if (ret->r == NULL || ret->s == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    s = ret->s;
+
+    if ((ctx = BN_CTX_new()) == NULL ||
+        (tmp = BN_new()) == NULL || (m = BN_new()) == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+
+    order = EC_GROUP_get0_order(group);
+    if (order == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_EC_LIB);
+        goto err;
+    }
+    i = BN_num_bits(order);
+    /*
+     * Need to truncate digest if it is too long: first truncate whole bytes.
+     */
+    if (8 * dgst_len > i)
+        dgst_len = (i + 7) / 8;
+    if (!BN_bin2bn(dgst, dgst_len, m)) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /* If still too long truncate remaining bits with a shift */
+    if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    do {
+        if (in_kinv == NULL || in_r == NULL) {
+            if (!ecdsa_sign_setup(eckey, ctx, &kinv, &ret->r, dgst, dgst_len)) {
+                ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_ECDSA_LIB);
+                goto err;
+            }
+            ckinv = kinv;
+        } else {
+            ckinv = in_kinv;
+            if (BN_copy(ret->r, in_r) == NULL) {
+                ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+                goto err;
+            }
+        }
+
+        if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) {
+            ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
+            goto err;
+        }
+        if (!BN_mod_add_quick(s, tmp, m, order)) {
+            ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
+            goto err;
+        }
+        if (!BN_mod_mul(s, s, ckinv, order, ctx)) {
+            ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_BN_LIB);
+            goto err;
+        }
+        if (BN_is_zero(s)) {
+            /*
+             * if kinv and r have been supplied by the caller don't to
+             * generate new kinv and r values
+             */
+            if (in_kinv != NULL && in_r != NULL) {
+                ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_NEED_NEW_SETUP_VALUES);
+                goto err;
+            }
+        } else
+            /* s != 0 => we have a valid signature */
+            break;
+    }
+    while (1);
+
+    ok = 1;
+ err:
+    if (!ok) {
+        ECDSA_SIG_free(ret);
+        ret = NULL;
+    }
+    BN_CTX_free(ctx);
+    BN_clear_free(m);
+    BN_clear_free(tmp);
+    BN_clear_free(kinv);
+    return ret;
+}
+
+/*-
+ * returns
+ *      1: correct signature
+ *      0: incorrect signature
+ *     -1: error
+ */
+int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
+                      const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
+{
+    ECDSA_SIG *s;
+    const unsigned char *p = sigbuf;
+    unsigned char *der = NULL;
+    int derlen = -1;
+    int ret = -1;
+
+    s = ECDSA_SIG_new();
+    if (s == NULL)
+        return (ret);
+    if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
+        goto err;
+    /* Ensure signature uses DER and doesn't have trailing garbage */
+    derlen = i2d_ECDSA_SIG(s, &der);
+    if (derlen != sig_len || memcmp(sigbuf, der, derlen) != 0)
+        goto err;
+    ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
+ err:
+    OPENSSL_clear_free(der, derlen);
+    ECDSA_SIG_free(s);
+    return (ret);
+}
+
+int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
+                          const ECDSA_SIG *sig, EC_KEY *eckey)
+{
+    int ret = -1, i;
+    BN_CTX *ctx;
+    const BIGNUM *order;
+    BIGNUM *u1, *u2, *m, *X;
+    EC_POINT *point = NULL;
+    const EC_GROUP *group;
+    const EC_POINT *pub_key;
+
+    /* check input values */
+    if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
+        (pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_MISSING_PARAMETERS);
+        return -1;
+    }
+
+    if (!EC_KEY_can_sign(eckey)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
+        return -1;
+    }
+
+    ctx = BN_CTX_new();
+    if (ctx == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
+        return -1;
+    }
+    BN_CTX_start(ctx);
+    u1 = BN_CTX_get(ctx);
+    u2 = BN_CTX_get(ctx);
+    m = BN_CTX_get(ctx);
+    X = BN_CTX_get(ctx);
+    if (X == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+
+    order = EC_GROUP_get0_order(group);
+    if (order == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
+        goto err;
+    }
+
+    if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
+        BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
+        BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, EC_R_BAD_SIGNATURE);
+        ret = 0;                /* signature is invalid */
+        goto err;
+    }
+    /* calculate tmp1 = inv(S) mod order */
+    if (!BN_mod_inverse(u2, sig->s, order, ctx)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /* digest -> m */
+    i = BN_num_bits(order);
+    /*
+     * Need to truncate digest if it is too long: first truncate whole bytes.
+     */
+    if (8 * dgst_len > i)
+        dgst_len = (i + 7) / 8;
+    if (!BN_bin2bn(dgst, dgst_len, m)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /* If still too long truncate remaining bits with a shift */
+    if ((8 * dgst_len > i) && !BN_rshift(m, m, 8 - (i & 0x7))) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /* u1 = m * tmp mod order */
+    if (!BN_mod_mul(u1, m, u2, order, ctx)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /* u2 = r * w mod q */
+    if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+
+    if ((point = EC_POINT_new(group)) == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
+        goto err;
+    }
+    if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
+        NID_X9_62_prime_field) {
+        if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL, ctx)) {
+            ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
+            goto err;
+        }
+    }
+#ifndef OPENSSL_NO_EC2M
+    else {                      /* NID_X9_62_characteristic_two_field */
+
+        if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL, ctx)) {
+            ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_EC_LIB);
+            goto err;
+        }
+    }
+#endif
+    if (!BN_nnmod(u1, X, order, ctx)) {
+        ECerr(EC_F_OSSL_ECDSA_VERIFY_SIG, ERR_R_BN_LIB);
+        goto err;
+    }
+    /*  if the signature is correct u1 is equal to sig->r */
+    ret = (BN_ucmp(u1, sig->r) == 0);
+ err:
+    BN_CTX_end(ctx);
+    BN_CTX_free(ctx);
+    EC_POINT_free(point);
+    return ret;
+}