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message_digest.h


products/Sources/formale Sprachen/C/Firefox/third_party/libwebrtc/rtc_base/message_digest.h

/* * Copyright 2004 The WebRTC Project Authors. All rights reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #ifndef RTC_BASE_MESSAGE_DIGEST_H_ #define RTC_BASE_MESSAGE_DIGEST_H_ #include #include #include #include #include "absl/strings/string_view.h" namespace webrtc { // Definitions for the digest algorithms. extern const char DIGEST_MD5[]; extern const char DIGEST_SHA_1[]; extern const char DIGEST_SHA_224[]; extern const char DIGEST_SHA_256[]; extern const char DIGEST_SHA_384[]; extern const char DIGEST_SHA_512[]; // A general class for computing hashes. class MessageDigest { public: enum { kMaxSize = 64 }; // Maximum known size (SHA-512) virtual ~MessageDigest() {} // Returns the digest output size (e.g. 16 bytes for MD5). virtual size_t Size() const = 0; // Updates the digest with `len` bytes from `buf`. virtual void Update(const void* buf, size_t len) = 0; // Outputs the digest value to `buf` with length `len`. // Returns the number of bytes written, i.e., Size(). virtual size_t Finish(void* buf, size_t len) = 0; }; // A factory class for creating digest objects. class MessageDigestFactory { public: static MessageDigest* Create(absl::string_view alg); }; // A check that an algorithm is in a list of approved digest algorithms // from RFC 4572 (FIPS 180). bool IsFips180DigestAlgorithm(absl::string_view alg); // Functions to create hashes. // Computes the hash of `in_len` bytes of `input`, using the `digest` hash // implementation, and outputs the hash to the buffer `output`, which is // `out_len` bytes long. Returns the number of bytes written to `output` if // successful, or 0 if `out_len` was too small. size_t ComputeDigest(MessageDigest* digest, const void* input, size_t in_len, void* output, size_t out_len); // Like the previous function, but creates a digest implementation based on // the desired digest name `alg`, e.g. DIGEST_SHA_1. Returns 0 if there is no // digest with the given name. size_t ComputeDigest(absl::string_view alg, const void* input, size_t in_len, void* output, size_t out_len); inline size_t ComputeDigest(absl::string_view alg, std::span input, std::span output) { return ComputeDigest(alg, input.data(), input.size(), output.data(), output.size()); } // Computes the hash of `input` using the `digest` hash implementation, and // returns it as a hex-encoded string. std::string ComputeDigest(MessageDigest* digest, absl::string_view input); // Like the previous function, but creates a digest implementation based on // the desired digest name `alg`, e.g. DIGEST_SHA_1. Returns empty string if // there is no digest with the given name. std::string ComputeDigest(absl::string_view alg, absl::string_view input); // Like the previous function, but returns an explicit result code. bool ComputeDigest(absl::string_view alg, absl::string_view input, std::string* output); // Shorthand way to compute a hex-encoded hash using MD5. inline std::string MD5(absl::string_view input) { return ComputeDigest(DIGEST_MD5, input); } // Functions to compute RFC 2104 HMACs. // Computes the HMAC of `in_len` bytes of `input`, using the `digest` hash // implementation and `key_len` bytes of `key` to key the HMAC, and outputs // the HMAC to the buffer `output`, which is `out_len` bytes long. Returns the // number of bytes written to `output` if successful, or 0 if `out_len` was too // small. size_t ComputeHmac(MessageDigest* digest, const void* key, size_t key_len, const void* input, size_t in_len, void* output, size_t out_len); // Like the previous function, but creates a digest implementation based on // the desired digest name `alg`, e.g. DIGEST_SHA_1. Returns 0 if there is no // digest with the given name. size_t ComputeHmac(absl::string_view alg, const void* key, size_t key_len, const void* input, size_t in_len, void* output, size_t out_len); inline size_t ComputeHmac(absl::string_view alg, std::span key, std::span input, std::span output) { return ComputeHmac(alg, key.data(), key.size(), input.data(), input.size(), output.data(), output.size()); } inline size_t ComputeHmac(absl::string_view alg, absl::string_view key, std::span input, std::span output) { return ComputeHmac(alg, key.data(), key.size(), input.data(), input.size(), output.data(), output.size()); } // Computes the HMAC of `input` using the `digest` hash implementation and `key` // to key the HMAC, and returns it as a hex-encoded string. std::string ComputeHmac(MessageDigest* digest, absl::string_view key, absl::string_view input); // Like the previous function, but creates a digest implementation based on // the desired digest name `alg`, e.g. DIGEST_SHA_1. Returns empty string if // there is no digest with the given name. std::string ComputeHmac(absl::string_view alg, absl::string_view key, absl::string_view input); // Like the previous function, but returns an explicit result code. bool ComputeHmac(absl::string_view alg, absl::string_view key, absl::string_view input, std::string* output); } // namespace webrtc #endif // RTC_BASE_MESSAGE_DIGEST_H_

                                                                                                                                                                                                                                                                                                                                                                                                     

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