http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/wvstreams/wvdigest.h

/* -*- Mode: C++ -*- * Worldvisions Tunnel Vision Software: * Copyright (C) 1997-2002 Net Integration Technologies, Inc. * * MD5, SHA-1 and HMAC digest abstractions. */ #ifndef __WVDIGEST_H #define __WVDIGEST_H #include "wvencoder.h" struct env_md_st; struct env_md_ctx_st; struct hmac_ctx_st; /** * Superclass for all message digests. * * All message digest encoders have the following semantics: * * - On encode() or flush(), data from the input buffer is * consumed and a message digest function is applied to * incrementally update the internal digest state. * No output is ever generated. * - On finish(), the message digest is finalized and its value * is written to the output buffer. Afterwards, no new data * can be processed unless reset() is called. * - On reset(), the current digest state is discarded allowing * a new stream of data to be processed. * */ class WvDigest : public WvEncoder { public: /** Returns the number of bytes in the message digest. */ virtual size_t digestsize() const = 0; }; /** * @internal * Base class for all digests constructed using the OpenSSL EVP API. */ class WvEVPMDDigest : public WvDigest { friend class WvHMACDigest; const env_md_st *evpmd; env_md_ctx_st *evpctx; bool active; public: virtual ~WvEVPMDDigest(); virtual size_t digestsize() const; protected: WvEVPMDDigest(const env_md_st *_evpmd); virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); // consumes input virtual bool _finish(WvBuf &outbuf); // outputs digest virtual bool _reset(); // supported: resets digest value const env_md_st *getevpmd() { return evpmd; } private: void cleanup(); }; /** * MD5 Digest. * Has a digest length of 128 bits. */ class WvMD5Digest : public WvEVPMDDigest { public: /** Creates an MD5 digest encoder. */ WvMD5Digest(); virtual ~WvMD5Digest() { } }; /** * SHA-1 Digest. * Has a digest length of 160 bits. */ class WvSHA1Digest : public WvEVPMDDigest { public: /** Creates an SHA1 digest encoder. */ WvSHA1Digest(); virtual ~WvSHA1Digest() { } }; /** * HMAC Message Authentication Code. * Has a digest length that equals that of its underlying * message digest encoder. */ class WvHMACDigest : public WvDigest { WvEVPMDDigest *digest; unsigned char *key; size_t keysize; hmac_ctx_st *hmacctx; bool active; public: /** * Creates an HMAC digest encoder. * * "digest" is the message digest encoder to use as a * hash function * "key" is the authentication key * "keysize" is the key size in bytes */ WvHMACDigest(WvEVPMDDigest *_digest, const void *_key, size_t _keysize); virtual ~WvHMACDigest(); virtual size_t digestsize() const; protected: virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); // consumes input virtual bool _finish(WvBuf &outbuf); // outputs digest virtual bool _reset(); // supported: resets digest value private: void cleanup(); }; /** * CRC32 checksum * Digest length of 4 bytes. */ class WvCrc32Digest : public WvDigest { unsigned long int crc; public: WvCrc32Digest(); virtual ~WvCrc32Digest() { } virtual size_t digestsize() const; virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); // consumes input virtual bool _finish(WvBuf &outbuf); // outputs digest virtual bool _reset(); // supported: resets digest value }; /** * Adler32 checksum * Digest length of 4 bytes. */ class WvAdler32Digest : public WvDigest { unsigned long int crc; public: WvAdler32Digest(); virtual ~WvAdler32Digest() { } virtual size_t digestsize() const; virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); // consumes input virtual bool _finish(WvBuf &outbuf); // outputs digest virtual bool _reset(); // supported: resets digest value }; #endif // __WVDIGEST_H