225 lines
7.0 KiB
Groff
225 lines
7.0 KiB
Groff
.\" $NetBSD: EVP_VerifyInit.3,v 1.13 2004/03/20 21:48:46 groo Exp $
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.\" ======================================================================
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.\"
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.IX Title "EVP_VerifyInit 3"
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.TH EVP_VerifyInit 3 "0.9.7d" "2003-09-24" "OpenSSL"
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.UC
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.SH "NAME"
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EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal \- \s-1EVP\s0 signature verification functions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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.Ve
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.Vb 3
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\& int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
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\& int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *d, unsigned int cnt);
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\& int EVP_VerifyFinal(EVP_MD_CTX *ctx,unsigned char *sigbuf, unsigned int siglen,EVP_PKEY *pkey);
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.Ve
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.Vb 1
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\& int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP\s0 signature verification routines are a high level interface to digital
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signatures.
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.PP
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\&\fIEVP_VerifyInit_ex()\fR sets up verification context \fBctx\fR to use digest
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\&\fBtype\fR from \s-1ENGINE\s0 \fBimpl\fR. \fBctx\fR must be initialized by calling
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\&\fIEVP_MD_CTX_init()\fR before calling this function.
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.PP
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\&\fIEVP_VerifyUpdate()\fR hashes \fBcnt\fR bytes of data at \fBd\fR into the
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verification context \fBctx\fR. This function can be called several times on the
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same \fBctx\fR to include additional data.
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.PP
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\&\fIEVP_VerifyFinal()\fR verifies the data in \fBctx\fR using the public key \fBpkey\fR
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and against the \fBsiglen\fR bytes at \fBsigbuf\fR.
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.PP
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\&\fIEVP_VerifyInit()\fR initializes verification context \fBctx\fR to use the default
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implementation of digest \fBtype\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_VerifyInit_ex()\fR and \fIEVP_VerifyUpdate()\fR return 1 for success and 0 for
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failure.
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.PP
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\&\fIEVP_VerifyFinal()\fR returns 1 for a correct signature, 0 for failure and \-1 if some
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other error occurred.
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.PP
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The error codes can be obtained by ERR_get_error(3).
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.SH "NOTES"
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.IX Header "NOTES"
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The \fB\s-1EVP\s0\fR interface to digital signatures should almost always be used in
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preference to the low level interfaces. This is because the code then becomes
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transparent to the algorithm used and much more flexible.
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.PP
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Due to the link between message digests and public key algorithms the correct
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digest algorithm must be used with the correct public key type. A list of
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algorithms and associated public key algorithms appears in
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EVP_DigestInit(3).
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.PP
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The call to \fIEVP_VerifyFinal()\fR internally finalizes a copy of the digest context.
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This means that calls to \fIEVP_VerifyUpdate()\fR and \fIEVP_VerifyFinal()\fR can be called
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later to digest and verify additional data.
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.PP
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Since only a copy of the digest context is ever finalized the context must
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be cleaned up after use by calling \fIEVP_MD_CTX_cleanup()\fR or a memory leak
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will occur.
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.SH "BUGS"
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.IX Header "BUGS"
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Older versions of this documentation wrongly stated that calls to
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\&\fIEVP_VerifyUpdate()\fR could not be made after calling \fIEVP_VerifyFinal()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_evp(3),
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EVP_SignInit(3),
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EVP_DigestInit(3), openssl_err(3),
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openssl_evp(3), openssl_hmac(3), md2(3),
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openssl_md5(3), openssl_mdc2(3), openssl_ripemd(3),
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openssl_sha(3), openssl_dgst(1)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIEVP_VerifyInit()\fR, \fIEVP_VerifyUpdate()\fR and \fIEVP_VerifyFinal()\fR are
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available in all versions of SSLeay and OpenSSL.
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.PP
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\&\fIEVP_VerifyInit_ex()\fR was added in OpenSSL 0.9.7
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