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NAME

     EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal - EVP
     signature verification functions



SYNOPSIS
      #include <openssl/evp.h>

      void EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type);
      void EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt);
      int EVP_VerifyFinal(EVP_MD_CTX *ctx,unsigned char *sigbuf, unsigned int siglen,EVP_PKEY *pkey);




DESCRIPTION
     The EVP signature verification routines are a high level
     interface to digital signatures.

     EVP_VerifyInit() initializes a verification context ctx to
     using digest type: this will typically be supplied by a
     function such as EVP_sha1().

     EVP_VerifyUpdate() hashes cnt bytes of data at d into the
     verification context ctx. This function can be called
     several times on the same ctx to include additional data.

     EVP_VerifyFinal() verifies the data in ctx using the public
     key pkey and against the siglen bytes at sigbuf. After
     calling EVP_VerifyFinal() no additional calls to
     EVP_VerifyUpdate() can be made, but EVP_VerifyInit() can be
     called to initialize a new verification operation.



RETURN VALUES
     EVP_VerifyInit() and EVP_VerifyUpdate() do not return
     values.

     EVP_VerifyFinal() returns 1 for a correct signature, 0 for
     failure and -1 if some other error occurred.

     The error codes can be obtained by ERR_get_error(3).



NOTES
     The EVP interface to digital signatures should almost always
     be used in preference to the low level interfaces. This is
     because the code then becomes transparent to the algorithm
     used and much more flexible.

     Due to the link between message digests and public key
     algorithms the correct digest algorithm must be used with
     the correct public key type. A list of algorithms and
     associated public key algorithms appears in
     EVP_DigestInit(3).




BUGS
     Several of the functions do not return values: maybe they
     should. Although the internal digest operations will never
     fail some future hardware based operations might.



SEE ALSO
     evp(3), EVP_SignInit(3), EVP_DigestInit(3), err(3), evp(3),
     hmac(3), md2(3), md5(3), mdc2(3), ripemd(3), sha(3),
     digest(1)



HISTORY
     EVP_VerifyInit(), EVP_VerifyUpdate() and EVP_VerifyFinal()
     are available in all versions of SSLeay and OpenSSL.









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Created 1996-2024 by Maxim Chirkov

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