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134 .TH EVP_DIGESTVERIFYINIT 3ossl "2023-09-19" "3.0.11" "OpenSSL"
141 EVP_DigestVerifyFinal, EVP_DigestVerify \- EVP signature verification functions
161 The \s-1EVP\s0 signature routines are a high-level interface to digital signatures.
172 \&\fIparams\fR, if not \s-1NULL,\s0 are set on the context before returning.
174 The \fIpkey\fR algorithm is used to fetch a \fB\s-1EVP_SIGNATURE\s0\fR method implicitly, to
179 those digests from any available provider. The OpenSSL \s-1FIPS\s0 provider also
181 implemented inside the \s-1FIPS\s0 provider.
184 \&\fBpctx\fR is not \s-1NULL,\s0 the \s-1EVP_PKEY_CTX\s0 of the verification operation will be
186 Note that any existing value in \fB*pctx\fR is overwritten. The \s-1EVP_PKEY_CTX\s0 value
188 an \s-1EVP_PKEY_CTX\s0 value before being passed to \fBEVP_DigestVerifyInit_ex()\fR
189 (which means the \s-1EVP_PKEY_CTX\s0 is created inside
191 \&\s-1EVP_MD_CTX\s0 is freed). If the \s-1EVP_PKEY_CTX\s0 to be used is created by
192 EVP_DigestVerifyInit_ex then it will use the \fB\s-1OSSL_LIB_CTX\s0\fR specified
195 No \fB\s-1EVP_PKEY_CTX\s0\fR will be created by \fBEVP_DigestVerifyInit_ex()\fR if the
197 See also \s-1\fBSM2\s0\fR\|(7).
200 .IP "\s-1DSA\s0" 4
202 Supports \s-1SHA1, SHA224, SHA256, SHA384\s0 and \s-1SHA512\s0
203 .IP "\s-1ECDSA\s0" 4
205 Supports \s-1SHA1, SHA224, SHA256, SHA384, SHA512\s0 and \s-1SM3\s0
206 .IP "\s-1RSA\s0 with no padding" 4
208 Supports no digests (the digest \fBtype\fR must be \s-1NULL\s0)
209 .IP "\s-1RSA\s0 with X931 padding" 4
211 Supports \s-1SHA1, SHA256, SHA384\s0 and \s-1SHA512\s0
212 .IP "All other \s-1RSA\s0 padding types" 4
214 Support \s-1SHA1, SHA224, SHA256, SHA384, SHA512, MD5, MD5_SHA1, MD2, MD4, MDC2,
215 SHA3\-224, SHA3\-256, SHA3\-384, SHA3\-512\s0
218 Support no digests (the digest \fBtype\fR must be \s-1NULL\s0)
219 .IP "\s-1HMAC\s0" 4
222 .IP "\s-1CMAC,\s0 Poly1305 and Siphash" 4
226 If RSA-PSS is used and restrictions apply then the digest must match.
230 inferred from the supplied digest \fBtype\fR, and \fBprops\fR will be \s-1NULL.\s0 Where
231 supplied the \s-1ENGINE\s0 \fBe\fR will be used for the signature verification and digest
232 algorithm implementations. \fBe\fR may be \s-1NULL.\s0
257 The \fB\s-1EVP\s0\fR interface to digital signatures should almost always be used in
258 preference to the low-level interfaces. This is because the code then becomes
261 \&\fBEVP_DigestVerify()\fR is a one shot operation which verifies a single block of
269 needed to be used to sign using \s-1SHA1\s0 and \s-1DSA.\s0 This is no longer necessary and
273 If the automatic seeding or reseeding of the OpenSSL \s-1CSPRNG\s0 fails due to
274 external circumstances (see \s-1\fBRAND\s0\fR\|(7)), the operation will fail.
282 preserved if the \fIpkey\fR parameter is \s-1NULL.\s0 The call then just resets the state
292 \&\fBevp\fR\|(7), \s-1\fBHMAC\s0\fR\|(3), \s-1\fBMD2\s0\fR\|(3),
293 \&\s-1\fBMD5\s0\fR\|(3), \s-1\fBMDC2\s0\fR\|(3), \s-1\fBRIPEMD160\s0\fR\|(3),
294 \&\s-1\fBSHA1\s0\fR\|(3), \fBopenssl\-dgst\fR\|(1),
295 \&\s-1\fBRAND\s0\fR\|(7)
307 Copyright 2006\-2023 The OpenSSL Project Authors. All Rights Reserved.
311 in the file \s-1LICENSE\s0 in the source distribution or at