--- /dev/null
+/* Written by Nils Larsch for the OpenSSL project. */
+/* ====================================================================
+ * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <openssl/ec.h>
+
+#include <limits.h>
+#include <string.h>
+
+#include <openssl/bytestring.h>
+#include <openssl/bn.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/nid.h>
+
+#include "../fipsmodule/ec/internal.h"
+#include "../bytestring/internal.h"
+#include "../internal.h"
+
+
+static const unsigned kParametersTag =
+ CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0;
+static const unsigned kPublicKeyTag =
+ CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1;
+
+EC_KEY *EC_KEY_parse_private_key(CBS *cbs, const EC_GROUP *group) {
+ CBS ec_private_key, private_key;
+ uint64_t version;
+ if (!CBS_get_asn1(cbs, &ec_private_key, CBS_ASN1_SEQUENCE) ||
+ !CBS_get_asn1_uint64(&ec_private_key, &version) ||
+ version != 1 ||
+ !CBS_get_asn1(&ec_private_key, &private_key, CBS_ASN1_OCTETSTRING)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ return NULL;
+ }
+
+ // Parse the optional parameters field.
+ EC_GROUP *inner_group = NULL;
+ EC_KEY *ret = NULL;
+ BIGNUM *priv_key = NULL;
+ if (CBS_peek_asn1_tag(&ec_private_key, kParametersTag)) {
+ // Per SEC 1, as an alternative to omitting it, one is allowed to specify
+ // this field and put in a NULL to mean inheriting this value. This was
+ // omitted in a previous version of this logic without problems, so leave it
+ // unimplemented.
+ CBS child;
+ if (!CBS_get_asn1(&ec_private_key, &child, kParametersTag)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ goto err;
+ }
+ inner_group = EC_KEY_parse_parameters(&child);
+ if (inner_group == NULL) {
+ goto err;
+ }
+ if (group == NULL) {
+ group = inner_group;
+ } else if (EC_GROUP_cmp(group, inner_group, NULL) != 0) {
+ // If a group was supplied externally, it must match.
+ OPENSSL_PUT_ERROR(EC, EC_R_GROUP_MISMATCH);
+ goto err;
+ }
+ if (CBS_len(&child) != 0) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ goto err;
+ }
+ }
+
+ if (group == NULL) {
+ OPENSSL_PUT_ERROR(EC, EC_R_MISSING_PARAMETERS);
+ goto err;
+ }
+
+ ret = EC_KEY_new();
+ if (ret == NULL || !EC_KEY_set_group(ret, group)) {
+ goto err;
+ }
+
+ // Although RFC 5915 specifies the length of the key, OpenSSL historically
+ // got this wrong, so accept any length. See upstream's
+ // 30cd4ff294252c4b6a4b69cbef6a5b4117705d22.
+ priv_key = BN_bin2bn(CBS_data(&private_key), CBS_len(&private_key), NULL);
+ ret->pub_key = EC_POINT_new(group);
+ if (priv_key == NULL || ret->pub_key == NULL ||
+ !EC_KEY_set_private_key(ret, priv_key)) {
+ goto err;
+ }
+
+ if (CBS_peek_asn1_tag(&ec_private_key, kPublicKeyTag)) {
+ CBS child, public_key;
+ uint8_t padding;
+ if (!CBS_get_asn1(&ec_private_key, &child, kPublicKeyTag) ||
+ !CBS_get_asn1(&child, &public_key, CBS_ASN1_BITSTRING) ||
+ // As in a SubjectPublicKeyInfo, the byte-encoded public key is then
+ // encoded as a BIT STRING with bits ordered as in the DER encoding.
+ !CBS_get_u8(&public_key, &padding) ||
+ padding != 0 ||
+ // Explicitly check |public_key| is non-empty to save the conversion
+ // form later.
+ CBS_len(&public_key) == 0 ||
+ !EC_POINT_oct2point(group, ret->pub_key, CBS_data(&public_key),
+ CBS_len(&public_key), NULL) ||
+ CBS_len(&child) != 0) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ goto err;
+ }
+
+ // Save the point conversion form.
+ // TODO(davidben): Consider removing this.
+ ret->conv_form =
+ (point_conversion_form_t)(CBS_data(&public_key)[0] & ~0x01);
+ } else {
+ // Compute the public key instead.
+ if (!ec_point_mul_scalar(group, ret->pub_key, &ret->priv_key->scalar, NULL,
+ NULL, NULL)) {
+ goto err;
+ }
+ // Remember the original private-key-only encoding.
+ // TODO(davidben): Consider removing this.
+ ret->enc_flag |= EC_PKEY_NO_PUBKEY;
+ }
+
+ if (CBS_len(&ec_private_key) != 0) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ goto err;
+ }
+
+ // Ensure the resulting key is valid.
+ if (!EC_KEY_check_key(ret)) {
+ goto err;
+ }
+
+ BN_free(priv_key);
+ EC_GROUP_free(inner_group);
+ return ret;
+
+err:
+ EC_KEY_free(ret);
+ BN_free(priv_key);
+ EC_GROUP_free(inner_group);
+ return NULL;
+}
+
+int EC_KEY_marshal_private_key(CBB *cbb, const EC_KEY *key,
+ unsigned enc_flags) {
+ if (key == NULL || key->group == NULL || key->priv_key == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ CBB ec_private_key, private_key;
+ if (!CBB_add_asn1(cbb, &ec_private_key, CBS_ASN1_SEQUENCE) ||
+ !CBB_add_asn1_uint64(&ec_private_key, 1 /* version */) ||
+ !CBB_add_asn1(&ec_private_key, &private_key, CBS_ASN1_OCTETSTRING) ||
+ !BN_bn2cbb_padded(&private_key,
+ BN_num_bytes(EC_GROUP_get0_order(key->group)),
+ EC_KEY_get0_private_key(key))) {
+ OPENSSL_PUT_ERROR(EC, EC_R_ENCODE_ERROR);
+ return 0;
+ }
+
+ if (!(enc_flags & EC_PKEY_NO_PARAMETERS)) {
+ CBB child;
+ if (!CBB_add_asn1(&ec_private_key, &child, kParametersTag) ||
+ !EC_KEY_marshal_curve_name(&child, key->group) ||
+ !CBB_flush(&ec_private_key)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_ENCODE_ERROR);
+ return 0;
+ }
+ }
+
+ // TODO(fork): replace this flexibility with sensible default?
+ if (!(enc_flags & EC_PKEY_NO_PUBKEY) && key->pub_key != NULL) {
+ CBB child, public_key;
+ if (!CBB_add_asn1(&ec_private_key, &child, kPublicKeyTag) ||
+ !CBB_add_asn1(&child, &public_key, CBS_ASN1_BITSTRING) ||
+ // As in a SubjectPublicKeyInfo, the byte-encoded public key is then
+ // encoded as a BIT STRING with bits ordered as in the DER encoding.
+ !CBB_add_u8(&public_key, 0 /* padding */) ||
+ !EC_POINT_point2cbb(&public_key, key->group, key->pub_key,
+ key->conv_form, NULL) ||
+ !CBB_flush(&ec_private_key)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_ENCODE_ERROR);
+ return 0;
+ }
+ }
+
+ if (!CBB_flush(cbb)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_ENCODE_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+// is_unsigned_integer returns one if |cbs| is a valid unsigned DER INTEGER and
+// zero otherwise.
+static int is_unsigned_integer(const CBS *cbs) {
+ if (CBS_len(cbs) == 0) {
+ return 0;
+ }
+ uint8_t byte = CBS_data(cbs)[0];
+ if ((byte & 0x80) ||
+ (byte == 0 && CBS_len(cbs) > 1 && (CBS_data(cbs)[1] & 0x80) == 0)) {
+ // Negative or not minimally-encoded.
+ return 0;
+ }
+ return 1;
+}
+
+// kPrimeFieldOID is the encoding of 1.2.840.10045.1.1.
+static const uint8_t kPrimeField[] = {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x01, 0x01};
+
+static int parse_explicit_prime_curve(CBS *in, CBS *out_prime, CBS *out_a,
+ CBS *out_b, CBS *out_base_x,
+ CBS *out_base_y, CBS *out_order) {
+ // See RFC 3279, section 2.3.5. Note that RFC 3279 calls this structure an
+ // ECParameters while RFC 5480 calls it a SpecifiedECDomain.
+ CBS params, field_id, field_type, curve, base;
+ uint64_t version;
+ if (!CBS_get_asn1(in, ¶ms, CBS_ASN1_SEQUENCE) ||
+ !CBS_get_asn1_uint64(¶ms, &version) ||
+ version != 1 ||
+ !CBS_get_asn1(¶ms, &field_id, CBS_ASN1_SEQUENCE) ||
+ !CBS_get_asn1(&field_id, &field_type, CBS_ASN1_OBJECT) ||
+ CBS_len(&field_type) != sizeof(kPrimeField) ||
+ OPENSSL_memcmp(CBS_data(&field_type), kPrimeField, sizeof(kPrimeField)) != 0 ||
+ !CBS_get_asn1(&field_id, out_prime, CBS_ASN1_INTEGER) ||
+ !is_unsigned_integer(out_prime) ||
+ CBS_len(&field_id) != 0 ||
+ !CBS_get_asn1(¶ms, &curve, CBS_ASN1_SEQUENCE) ||
+ !CBS_get_asn1(&curve, out_a, CBS_ASN1_OCTETSTRING) ||
+ !CBS_get_asn1(&curve, out_b, CBS_ASN1_OCTETSTRING) ||
+ // |curve| has an optional BIT STRING seed which we ignore.
+ !CBS_get_asn1(¶ms, &base, CBS_ASN1_OCTETSTRING) ||
+ !CBS_get_asn1(¶ms, out_order, CBS_ASN1_INTEGER) ||
+ !is_unsigned_integer(out_order)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ return 0;
+ }
+
+ // |params| has an optional cofactor which we ignore. With the optional seed
+ // in |curve|, a group already has arbitrarily many encodings. Parse enough to
+ // uniquely determine the curve.
+
+ // Require that the base point use uncompressed form.
+ uint8_t form;
+ if (!CBS_get_u8(&base, &form) || form != POINT_CONVERSION_UNCOMPRESSED) {
+ OPENSSL_PUT_ERROR(EC, EC_R_INVALID_FORM);
+ return 0;
+ }
+
+ if (CBS_len(&base) % 2 != 0) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ return 0;
+ }
+ size_t field_len = CBS_len(&base) / 2;
+ CBS_init(out_base_x, CBS_data(&base), field_len);
+ CBS_init(out_base_y, CBS_data(&base) + field_len, field_len);
+
+ return 1;
+}
+
+// integers_equal returns one if |a| and |b| are equal, up to leading zeros, and
+// zero otherwise.
+static int integers_equal(const CBS *a, const uint8_t *b, size_t b_len) {
+ // Remove leading zeros from |a| and |b|.
+ CBS a_copy = *a;
+ while (CBS_len(&a_copy) > 0 && CBS_data(&a_copy)[0] == 0) {
+ CBS_skip(&a_copy, 1);
+ }
+ while (b_len > 0 && b[0] == 0) {
+ b++;
+ b_len--;
+ }
+ return CBS_mem_equal(&a_copy, b, b_len);
+}
+
+EC_GROUP *EC_KEY_parse_curve_name(CBS *cbs) {
+ CBS named_curve;
+ if (!CBS_get_asn1(cbs, &named_curve, CBS_ASN1_OBJECT)) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ return NULL;
+ }
+
+ // Look for a matching curve.
+ const struct built_in_curves *const curves = OPENSSL_built_in_curves();
+ for (size_t i = 0; i < OPENSSL_NUM_BUILT_IN_CURVES; i++) {
+ const struct built_in_curve *curve = &curves->curves[i];
+ if (CBS_len(&named_curve) == curve->oid_len &&
+ OPENSSL_memcmp(CBS_data(&named_curve), curve->oid, curve->oid_len) ==
+ 0) {
+ return EC_GROUP_new_by_curve_name(curve->nid);
+ }
+ }
+
+ OPENSSL_PUT_ERROR(EC, EC_R_UNKNOWN_GROUP);
+ return NULL;
+}
+
+int EC_KEY_marshal_curve_name(CBB *cbb, const EC_GROUP *group) {
+ int nid = EC_GROUP_get_curve_name(group);
+ if (nid == NID_undef) {
+ OPENSSL_PUT_ERROR(EC, EC_R_UNKNOWN_GROUP);
+ return 0;
+ }
+
+ const struct built_in_curves *const curves = OPENSSL_built_in_curves();
+ for (size_t i = 0; i < OPENSSL_NUM_BUILT_IN_CURVES; i++) {
+ const struct built_in_curve *curve = &curves->curves[i];
+ if (curve->nid == nid) {
+ CBB child;
+ return CBB_add_asn1(cbb, &child, CBS_ASN1_OBJECT) &&
+ CBB_add_bytes(&child, curve->oid, curve->oid_len) &&
+ CBB_flush(cbb);
+ }
+ }
+
+ OPENSSL_PUT_ERROR(EC, EC_R_UNKNOWN_GROUP);
+ return 0;
+}
+
+EC_GROUP *EC_KEY_parse_parameters(CBS *cbs) {
+ if (!CBS_peek_asn1_tag(cbs, CBS_ASN1_SEQUENCE)) {
+ return EC_KEY_parse_curve_name(cbs);
+ }
+
+ // OpenSSL sometimes produces ECPrivateKeys with explicitly-encoded versions
+ // of named curves.
+ //
+ // TODO(davidben): Remove support for this.
+ CBS prime, a, b, base_x, base_y, order;
+ if (!parse_explicit_prime_curve(cbs, &prime, &a, &b, &base_x, &base_y,
+ &order)) {
+ return NULL;
+ }
+
+ // Look for a matching prime curve.
+ const struct built_in_curves *const curves = OPENSSL_built_in_curves();
+ for (size_t i = 0; i < OPENSSL_NUM_BUILT_IN_CURVES; i++) {
+ const struct built_in_curve *curve = &curves->curves[i];
+ const unsigned param_len = curve->param_len;
+ // |curve->params| is ordered p, a, b, x, y, order, each component
+ // zero-padded up to the field length. Although SEC 1 states that the
+ // Field-Element-to-Octet-String conversion also pads, OpenSSL mis-encodes
+ // |a| and |b|, so this comparison must allow omitting leading zeros. (This
+ // is relevant for P-521 whose |b| has a leading 0.)
+ if (integers_equal(&prime, curve->params, param_len) &&
+ integers_equal(&a, curve->params + param_len, param_len) &&
+ integers_equal(&b, curve->params + param_len * 2, param_len) &&
+ integers_equal(&base_x, curve->params + param_len * 3, param_len) &&
+ integers_equal(&base_y, curve->params + param_len * 4, param_len) &&
+ integers_equal(&order, curve->params + param_len * 5, param_len)) {
+ return EC_GROUP_new_by_curve_name(curve->nid);
+ }
+ }
+
+ OPENSSL_PUT_ERROR(EC, EC_R_UNKNOWN_GROUP);
+ return NULL;
+}
+
+int EC_POINT_point2cbb(CBB *out, const EC_GROUP *group, const EC_POINT *point,
+ point_conversion_form_t form, BN_CTX *ctx) {
+ size_t len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);
+ if (len == 0) {
+ return 0;
+ }
+ uint8_t *p;
+ return CBB_add_space(out, &p, len) &&
+ EC_POINT_point2oct(group, point, form, p, len, ctx) == len;
+}
+
+EC_KEY *d2i_ECPrivateKey(EC_KEY **out, const uint8_t **inp, long len) {
+ // This function treats its |out| parameter differently from other |d2i|
+ // functions. If supplied, take the group from |*out|.
+ const EC_GROUP *group = NULL;
+ if (out != NULL && *out != NULL) {
+ group = EC_KEY_get0_group(*out);
+ }
+
+ if (len < 0) {
+ OPENSSL_PUT_ERROR(EC, EC_R_DECODE_ERROR);
+ return NULL;
+ }
+ CBS cbs;
+ CBS_init(&cbs, *inp, (size_t)len);
+ EC_KEY *ret = EC_KEY_parse_private_key(&cbs, group);
+ if (ret == NULL) {
+ return NULL;
+ }
+ if (out != NULL) {
+ EC_KEY_free(*out);
+ *out = ret;
+ }
+ *inp = CBS_data(&cbs);
+ return ret;
+}
+
+int i2d_ECPrivateKey(const EC_KEY *key, uint8_t **outp) {
+ CBB cbb;
+ if (!CBB_init(&cbb, 0) ||
+ !EC_KEY_marshal_private_key(&cbb, key, EC_KEY_get_enc_flags(key))) {
+ CBB_cleanup(&cbb);
+ return -1;
+ }
+ return CBB_finish_i2d(&cbb, outp);
+}
+
+EC_KEY *d2i_ECParameters(EC_KEY **out_key, const uint8_t **inp, long len) {
+ if (len < 0) {
+ return NULL;
+ }
+
+ CBS cbs;
+ CBS_init(&cbs, *inp, (size_t)len);
+ EC_GROUP *group = EC_KEY_parse_parameters(&cbs);
+ if (group == NULL) {
+ return NULL;
+ }
+
+ EC_KEY *ret = EC_KEY_new();
+ if (ret == NULL || !EC_KEY_set_group(ret, group)) {
+ EC_GROUP_free(group);
+ EC_KEY_free(ret);
+ return NULL;
+ }
+ EC_GROUP_free(group);
+
+ if (out_key != NULL) {
+ EC_KEY_free(*out_key);
+ *out_key = ret;
+ }
+ *inp = CBS_data(&cbs);
+ return ret;
+}
+
+int i2d_ECParameters(const EC_KEY *key, uint8_t **outp) {
+ if (key == NULL || key->group == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER);
+ return -1;
+ }
+
+ CBB cbb;
+ if (!CBB_init(&cbb, 0) ||
+ !EC_KEY_marshal_curve_name(&cbb, key->group)) {
+ CBB_cleanup(&cbb);
+ return -1;
+ }
+ return CBB_finish_i2d(&cbb, outp);
+}
+
+EC_KEY *o2i_ECPublicKey(EC_KEY **keyp, const uint8_t **inp, long len) {
+ EC_KEY *ret = NULL;
+
+ if (keyp == NULL || *keyp == NULL || (*keyp)->group == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER);
+ return NULL;
+ }
+ ret = *keyp;
+ if (ret->pub_key == NULL &&
+ (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+ if (!EC_POINT_oct2point(ret->group, ret->pub_key, *inp, len, NULL)) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_EC_LIB);
+ return NULL;
+ }
+ // save the point conversion form
+ ret->conv_form = (point_conversion_form_t)(*inp[0] & ~0x01);
+ *inp += len;
+ return ret;
+}
+
+int i2o_ECPublicKey(const EC_KEY *key, uint8_t **outp) {
+ size_t buf_len = 0;
+ int new_buffer = 0;
+
+ if (key == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ buf_len = EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, NULL,
+ 0, NULL);
+
+ if (outp == NULL || buf_len == 0) {
+ // out == NULL => just return the length of the octet string
+ return buf_len;
+ }
+
+ if (*outp == NULL) {
+ *outp = OPENSSL_malloc(buf_len);
+ if (*outp == NULL) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ new_buffer = 1;
+ }
+ if (!EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, *outp,
+ buf_len, NULL)) {
+ OPENSSL_PUT_ERROR(EC, ERR_R_EC_LIB);
+ if (new_buffer) {
+ OPENSSL_free(*outp);
+ *outp = NULL;
+ }
+ return 0;
+ }
+
+ if (!new_buffer) {
+ *outp += buf_len;
+ }
+ return buf_len;
+}
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