forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
244 lines
9.2 KiB
Groff
244 lines
9.2 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "EVP_DIGESTVERIFYINIT 3"
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.TH EVP_DIGESTVERIFYINIT 3 "2020-04-21" "1.1.1g" "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_DigestVerifyInit, EVP_DigestVerifyUpdate, EVP_DigestVerifyFinal, EVP_DigestVerify \- 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_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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\& const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey);
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\& int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt);
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\& int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
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\& size_t siglen);
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\& int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
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\& size_t siglen, const unsigned char *tbs, size_t tbslen);
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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 routines are a high level interface to digital signatures.
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.PP
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\&\fBEVP_DigestVerifyInit()\fR sets up verification context \fBctx\fR to use digest
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\&\fBtype\fR from \s-1ENGINE\s0 \fBe\fR and public key \fBpkey\fR. \fBctx\fR must be created
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with \fBEVP_MD_CTX_new()\fR before calling this function. If \fBpctx\fR is not \s-1NULL,\s0 the
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\&\s-1EVP_PKEY_CTX\s0 of the verification operation will be written to \fB*pctx\fR: this
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can be used to set alternative verification options. Note that any existing
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value in \fB*pctx\fR is overwritten. The \s-1EVP_PKEY_CTX\s0 value returned must not be freed
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directly by the application if \fBctx\fR is not assigned an \s-1EVP_PKEY_CTX\s0 value before
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being passed to \fBEVP_DigestVerifyInit()\fR (which means the \s-1EVP_PKEY_CTX\s0 is created
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inside \fBEVP_DigestVerifyInit()\fR and it will be freed automatically when the
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\&\s-1EVP_MD_CTX\s0 is freed).
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.PP
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No \fB\s-1EVP_PKEY_CTX\s0\fR will be created by \fBEVP_DigestSignInit()\fR if the passed \fBctx\fR
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has already been assigned one via \fBEVP_MD_CTX_set_pkey_ctx\fR\|(3). See also \s-1\fBSM2\s0\fR\|(7).
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.PP
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\&\fBEVP_DigestVerifyUpdate()\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. This function is currently implemented
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using a macro.
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.PP
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\&\fBEVP_DigestVerifyFinal()\fR verifies the data in \fBctx\fR against the signature in
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\&\fBsig\fR of length \fBsiglen\fR.
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.PP
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\&\fBEVP_DigestVerify()\fR verifies \fBtbslen\fR bytes at \fBtbs\fR against the signature
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in \fBsig\fR of length \fBsiglen\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBEVP_DigestVerifyInit()\fR and \fBEVP_DigestVerifyUpdate()\fR return 1 for success and 0
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for failure.
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.PP
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\&\fBEVP_DigestVerifyFinal()\fR and \fBEVP_DigestVerify()\fR return 1 for success; any other
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value indicates failure. A return value of zero indicates that the signature
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did not verify successfully (that is, \fBtbs\fR did not match the original data or
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the signature had an invalid form), while other values indicate a more serious
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error (and sometimes also indicate an invalid signature form).
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.PP
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The error codes can be obtained from \fBERR_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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\&\fBEVP_DigestVerify()\fR is a one shot operation which verifies a single block of
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data in one function. For algorithms that support streaming it is equivalent
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to calling \fBEVP_DigestVerifyUpdate()\fR and \fBEVP_DigestVerifyFinal()\fR. For
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algorithms which do not support streaming (e.g. PureEdDSA) it is the only way
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to verify data.
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.PP
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In previous versions of OpenSSL there was a link between message digest types
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and public key algorithms. This meant that \*(L"clone\*(R" digests such as \fBEVP_dss1()\fR
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needed to be used to sign using \s-1SHA1\s0 and \s-1DSA.\s0 This is no longer necessary and
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the use of clone digest is now discouraged.
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.PP
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For some key types and parameters the random number generator must be seeded.
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If the automatic seeding or reseeding of the OpenSSL \s-1CSPRNG\s0 fails due to
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external circumstances (see \s-1\fBRAND\s0\fR\|(7)), the operation will fail.
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.PP
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The call to \fBEVP_DigestVerifyFinal()\fR internally finalizes a copy of the digest
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context. This means that \fBEVP_VerifyUpdate()\fR and \fBEVP_VerifyFinal()\fR can
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be called 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 \fBEVP_MD_CTX_free()\fR or a memory leak
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will occur.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBEVP_DigestSignInit\fR\|(3),
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\&\fBEVP_DigestInit\fR\|(3),
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\&\fBevp\fR\|(7), \s-1\fBHMAC\s0\fR\|(3), \s-1\fBMD2\s0\fR\|(3),
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\&\s-1\fBMD5\s0\fR\|(3), \s-1\fBMDC2\s0\fR\|(3), \s-1\fBRIPEMD160\s0\fR\|(3),
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\&\s-1\fBSHA1\s0\fR\|(3), \fBdgst\fR\|(1),
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\&\s-1\fBRAND\s0\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fBEVP_DigestVerifyInit()\fR, \fBEVP_DigestVerifyUpdate()\fR and \fBEVP_DigestVerifyFinal()\fR
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were added in OpenSSL 1.0.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2006\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (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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