217 lines
7.2 KiB
Groff
Executable File
217 lines
7.2 KiB
Groff
Executable File
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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 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_VerifyInit_ex,
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EVP_VerifyInit, EVP_VerifyUpdate, EVP_VerifyFinal
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\&\- EVP signature verification functions
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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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\&
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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,
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\& EVP_PKEY *pkey);
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\&
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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 created by calling
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\&\fIEVP_MD_CTX_new()\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 \fIERR_get_error\fR\|(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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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_free()\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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.PP
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Since the public key is passed in the call to \fIEVP_SignFinal()\fR any error
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relating to the private key (for example an unsuitable key and digest
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combination) will not be indicated until after potentially large amounts of
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data have been passed through \fIEVP_SignUpdate()\fR.
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.PP
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It is not possible to change the signing parameters using these function.
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.PP
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The previous two bugs are fixed in the newer EVP_DigestVerify*() function.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIevp\fR\|(7),
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\&\fIEVP_SignInit\fR\|(3),
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\&\fIEVP_DigestInit\fR\|(3),
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\&\fIevp\fR\|(7), \s-1\fIHMAC\s0\fR\|(3), \s-1\fIMD2\s0\fR\|(3),
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\&\s-1\fIMD5\s0\fR\|(3), \s-1\fIMDC2\s0\fR\|(3), \s-1\fIRIPEMD160\s0\fR\|(3),
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\&\s-1\fISHA1\s0\fR\|(3), \fIopenssl\-dgst\fR\|(1)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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