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28 #ifndef TALK_BASE_OPENSSLDIGEST_H_
29 #define TALK_BASE_OPENSSLDIGEST_H_
31 #include <openssl/evp.h>
33 #include "talk/base/messagedigest.h"
37 // An implementation of the digest class that uses OpenSSL.
38 class OpenSSLDigest : public MessageDigest {
40 // Creates an OpenSSLDigest with |algorithm| as the hash algorithm.
41 explicit OpenSSLDigest(const std::string& algorithm);
43 // Returns the digest output size (e.g. 16 bytes for MD5).
44 virtual size_t Size() const;
45 // Updates the digest with |len| bytes from |buf|.
46 virtual void Update(const void* buf, size_t len);
47 // Outputs the digest value to |buf| with length |len|.
48 virtual size_t Finish(void* buf, size_t len);
50 // Helper function to look up a digest's EVP by name.
51 static bool GetDigestEVP(const std::string &algorithm,
53 // Helper function to look up a digest's name by EVP.
54 static bool GetDigestName(const EVP_MD* md,
55 std::string* algorithm);
56 // Helper function to get the length of a digest.
57 static bool GetDigestSize(const std::string &algorithm,
65 } // namespace talk_base
67 #endif // TALK_BASE_OPENSSLDIGEST_H_