Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / third_party / boringssl / include / openssl / hkdf.h

diff --git a/legacy-libs/grpc/deps/grpc/third_party/boringssl/include/openssl/hkdf.h b/legacy-libs/grpc/deps/grpc/third_party/boringssl/include/openssl/hkdf.h
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+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_HKDF_H
+#define OPENSSL_HEADER_HKDF_H
+
+#include <openssl/base.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// HKDF.
+
+
+// HKDF computes HKDF (as specified by RFC 5869) of initial keying material
+// |secret| with |salt| and |info| using |digest|, and outputs |out_len| bytes
+// to |out_key|. It returns one on success and zero on error.
+//
+// HKDF is an Extract-and-Expand algorithm. It does not do any key stretching,
+// and as such, is not suited to be used alone to generate a key from a
+// password.
+OPENSSL_EXPORT int HKDF(uint8_t *out_key, size_t out_len, const EVP_MD *digest,
+                        const uint8_t *secret, size_t secret_len,
+                        const uint8_t *salt, size_t salt_len,
+                        const uint8_t *info, size_t info_len);
+
+// HKDF_extract computes a HKDF PRK (as specified by RFC 5869) from initial
+// keying material |secret| and salt |salt| using |digest|, and outputs
+// |out_len| bytes to |out_key|. The maximum output size is |EVP_MAX_MD_SIZE|.
+// It returns one on success and zero on error.
+OPENSSL_EXPORT int HKDF_extract(uint8_t *out_key, size_t *out_len,
+                                const EVP_MD *digest, const uint8_t *secret,
+                                size_t secret_len, const uint8_t *salt,
+                                size_t salt_len);
+
+// HKDF_expand computes a HKDF OKM (as specified by RFC 5869) of length
+// |out_len| from the PRK |prk| and info |info| using |digest|, and outputs
+// the result to |out_key|. It returns one on success and zero on error.
+OPENSSL_EXPORT int HKDF_expand(uint8_t *out_key, size_t out_len,
+                               const EVP_MD *digest, const uint8_t *prk,
+                               size_t prk_len, const uint8_t *info,
+                               size_t info_len);
+
+
+#if defined(__cplusplus)
+}  // extern C
+#endif
+
+#define HKDF_R_OUTPUT_TOO_LARGE 100
+
+#endif  // OPENSSL_HEADER_HKDF_H