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 Title "EVP_MD-SHA1 7" 
 EVP_MD-SHA1 7 2026-04-07 3.5.6 OpenSSL
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 NAME
EVP_MD-SHA1 - The SHA1 EVP_MD implementation

 DESCRIPTION
 Header "DESCRIPTION" Support for computing SHA1 digests through the EVP_MD API.

 Identities
 Subsection "Identities" This implementation is available with the FIPS provider as well as the
default provider, and is identified with the names "SHA1" and "SHA-1".

 "Gettable Parameters"
 Subsection "Gettable Parameters" This implementation supports the common gettable parameters described
in EVP_MD-common\|(7).

 "Settable Context Parameters"
 Subsection "Settable Context Parameters" This implementation supports the following OSSL_PARAM\|(3) entries,
settable for an EVP_MD_CTX with EVP_MD_CTX_set_params\|(3):

 """ssl3-ms"" (OSSL_DIGEST_PARAM_SSL3_MS) <octet string>" 4
 Item """ssl3-ms"" (OSSL_DIGEST_PARAM_SSL3_MS) <octet string>" This parameter is set by libssl in order to calculate a signature hash for an
SSLv3 CertificateVerify message as per RFC6101.
It is only set after all handshake messages have already been digested via
\fBOP_digest_update() calls.
The parameter provides the master secret value to be added to the digest.
The digest implementation should calculate the complete digest as per RFC6101
section 5.6.8.
The next call after setting this parameter should be OP_digest_final().

 "SEE ALSO"
 Header "SEE ALSO" \fBEVP_MD_CTX_set_params\|(3), provider-digest\|(7),
\fBOSSL_PROVIDER-FIPS\|(7), OSSL_PROVIDER-default\|(7)

 COPYRIGHT
 Header "COPYRIGHT" Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.


Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.