322 lines
13 KiB
Plaintext
322 lines
13 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_DIGESTVERIFYINIT 3ossl"
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.TH EVP_DIGESTVERIFYINIT 3ossl "2024-01-30" "3.2.1" "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_ex, EVP_DigestVerifyInit, EVP_DigestVerifyUpdate,
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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_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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\& const char *mdname, OSSL_LIB_CTX *libctx,
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\& const char *props, EVP_PKEY *pkey,
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\& const OSSL_PARAM params[]);
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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 *sig,
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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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Input data is digested first before the signature verification takes place.
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.PP
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\&\fIEVP_DigestVerifyInit_ex()\fR sets up verification context \fBctx\fR to use a
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digest with the name \fBmdname\fR and public key \fBpkey\fR. The name of the digest to
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be used is passed to the provider of the signature algorithm in use. How that
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provider interprets the digest name is provider specific. The provider may
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implement that digest directly itself or it may (optionally) choose to fetch it
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(which could result in a digest from a different provider being selected). If
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the provider supports fetching the digest then it may use the \fBprops\fR argument
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for the properties to be used during the fetch. Finally, the passed parameters
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\&\fIparams\fR, if not \s-1NULL,\s0 are set on the context before returning.
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.PP
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The \fIpkey\fR algorithm is used to fetch a \fB\s-1EVP_SIGNATURE\s0\fR method implicitly, to
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be used for the actual signing. See \*(L"Implicit fetch\*(R" in \fIprovider\fR\|(7) for
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more information about implicit fetches.
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.PP
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The OpenSSL default and legacy providers support fetching digests and can fetch
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those digests from any available provider. The OpenSSL \s-1FIPS\s0 provider also
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supports fetching digests but will only fetch digests that are themselves
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implemented inside the \s-1FIPS\s0 provider.
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.PP
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\&\fBctx\fR must be created with \fIEVP_MD_CTX_new()\fR before calling this function. If
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\&\fBpctx\fR is not \s-1NULL,\s0 the \s-1EVP_PKEY_CTX\s0 of the verification operation will be
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written to \fB*pctx\fR: this can be used to set alternative verification options.
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Note that any existing value in \fB*pctx\fR is overwritten. The \s-1EVP_PKEY_CTX\s0 value
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returned must not be freed directly by the application if \fBctx\fR is not assigned
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an \s-1EVP_PKEY_CTX\s0 value before being passed to \fIEVP_DigestVerifyInit_ex()\fR
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(which means the \s-1EVP_PKEY_CTX\s0 is created inside
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\&\fIEVP_DigestVerifyInit_ex()\fR and it will be freed automatically when the
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\&\s-1EVP_MD_CTX\s0 is freed). If the \s-1EVP_PKEY_CTX\s0 to be used is created by
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EVP_DigestVerifyInit_ex then it will use the \fB\s-1OSSL_LIB_CTX\s0\fR specified
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in \fIlibctx\fR and the property query string specified in \fIprops\fR.
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.PP
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No \fB\s-1EVP_PKEY_CTX\s0\fR will be created by \fIEVP_DigestVerifyInit_ex()\fR if the
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passed \fBctx\fR has already been assigned one via \fIEVP_MD_CTX_set_pkey_ctx\fR\|(3).
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See also \s-1\fISM2\s0\fR\|(7).
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.PP
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Not all digests can be used for all key types. The following combinations apply.
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.IP "\s-1DSA\s0" 4
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.IX Item "DSA"
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Supports \s-1SHA1, SHA224, SHA256, SHA384\s0 and \s-1SHA512\s0
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.IP "\s-1ECDSA\s0" 4
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.IX Item "ECDSA"
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Supports \s-1SHA1, SHA224, SHA256, SHA384, SHA512\s0 and \s-1SM3\s0
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.IP "\s-1RSA\s0 with no padding" 4
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.IX Item "RSA with no padding"
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Supports no digests (the digest \fBtype\fR must be \s-1NULL\s0)
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.IP "\s-1RSA\s0 with X931 padding" 4
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.IX Item "RSA with X931 padding"
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Supports \s-1SHA1, SHA256, SHA384\s0 and \s-1SHA512\s0
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.IP "All other \s-1RSA\s0 padding types" 4
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.IX Item "All other RSA padding types"
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Support \s-1SHA1, SHA224, SHA256, SHA384, SHA512, MD5, MD5_SHA1, MD2, MD4, MDC2,
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SHA3\-224, SHA3\-256, SHA3\-384, SHA3\-512\s0
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.IP "Ed25519 and Ed448" 4
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.IX Item "Ed25519 and Ed448"
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Support no digests (the digest \fBtype\fR must be \s-1NULL\s0)
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.IP "\s-1HMAC\s0" 4
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.IX Item "HMAC"
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Supports any digest
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.IP "\s-1CMAC,\s0 Poly1305 and Siphash" 4
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.IX Item "CMAC, Poly1305 and Siphash"
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Will ignore any digest provided.
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.PP
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If RSA-PSS is used and restrictions apply then the digest must match.
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.PP
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\&\fIEVP_DigestVerifyInit()\fR works in the same way as
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\&\fIEVP_DigestVerifyInit_ex()\fR except that the \fBmdname\fR parameter will be
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inferred from the supplied digest \fBtype\fR, and \fBprops\fR will be \s-1NULL.\s0 Where
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supplied the \s-1ENGINE \s0\fBe\fR will be used for the signature verification and digest
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algorithm implementations. \fBe\fR may be \s-1NULL.\s0
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.PP
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\&\fIEVP_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.
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.PP
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\&\fIEVP_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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\&\fIEVP_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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\&\fIEVP_DigestVerifyInit()\fR and \fIEVP_DigestVerifyUpdate()\fR return 1 for success and 0
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for failure.
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.PP
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\&\fIEVP_DigestVerifyFinal()\fR and \fIEVP_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 \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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\&\fIEVP_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 \fIEVP_DigestVerifyUpdate()\fR and \fIEVP_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 \fIEVP_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\fIRAND\s0\fR\|(7)), the operation will fail.
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.PP
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The call to \fIEVP_DigestVerifyFinal()\fR internally finalizes a copy of the digest
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context. This means that \fIEVP_VerifyUpdate()\fR and \fIEVP_VerifyFinal()\fR can
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be called later to digest and verify additional data. Applications may disable
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this behavior by setting the \s-1EVP_MD_CTX_FLAG_FINALISE\s0 context flag via
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\&\fIEVP_MD_CTX_set_flags\fR\|(3).
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.PP
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Note that not all providers support continuation, in case the selected
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provider does not allow to duplicate contexts \fIEVP_DigestVerifyFinal()\fR will
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finalize the digest context and attempting to process additional data via
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\&\fIEVP_DigestVerifyUpdate()\fR will result in an error.
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.PP
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\&\fIEVP_DigestVerifyInit()\fR and \fIEVP_DigestVerifyInit_ex()\fR functions can be called
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multiple times on a context and the parameters set by previous calls should be
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preserved if the \fIpkey\fR parameter is \s-1NULL.\s0 The call then just resets the state
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of the \fIctx\fR.
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.PP
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Ignoring failure returns of \fIEVP_DigestVerifyInit()\fR and \fIEVP_DigestVerifyInit_ex()\fR
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functions can lead to subsequent undefined behavior when calling
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\&\fIEVP_DigestVerifyUpdate()\fR, \fIEVP_DigestVerifyFinal()\fR, or \fIEVP_DigestVerify()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_DigestSignInit\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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\&\s-1\fIRAND\s0\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIEVP_DigestVerifyInit()\fR, \fIEVP_DigestVerifyUpdate()\fR and \fIEVP_DigestVerifyFinal()\fR
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were added in OpenSSL 1.0.0.
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.PP
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\&\fIEVP_DigestVerifyInit_ex()\fR was added in OpenSSL 3.0.
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.PP
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\&\fIEVP_DigestVerifyUpdate()\fR was converted from a macro to a function in OpenSSL
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3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2006\-2023 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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