EVP_VerifyInit man page on Ultrix

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EVP_VerifyInit(3)		    OpenSSL		     EVP_VerifyInit(3)

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), dgst(1)

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

3rd Berkeley Distribution	    0.9.6m		     EVP_VerifyInit(3)
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