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Title "X509_DIGEST 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
X509_digest, X509_digest_sig, X509_CRL_digest, X509_pubkey_digest, X509_NAME_digest, X509_REQ_digest, PKCS7_ISSUER_AND_SERIAL_digest \- get digest of various objects Header "SYNOPSIS" .Vb 1 #include <openssl/x509.h> \& int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md, unsigned int *len); ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert, EVP_MD **md_used, int *md_is_fallback); \& int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md, unsigned int *len); \& int X509_pubkey_digest(const X509 *data, const EVP_MD *type, unsigned char *md, unsigned int *len); \& int X509_REQ_digest(const X509_REQ *data, const EVP_MD *type, unsigned char *md, unsigned int *len); \& int X509_NAME_digest(const X509_NAME *data, const EVP_MD *type, unsigned char *md, unsigned int *len); \& #include <openssl/pkcs7.h> \& int PKCS7_ISSUER_AND_SERIAL_digest(PKCS7_ISSUER_AND_SERIAL *data, const EVP_MD *type, unsigned char *md, unsigned int *len); .Ve Header "DESCRIPTION" \fBX509_digest_sig() calculates a digest of the given certificate cert using the same hash algorithm as in its signature, if the digest is an integral part of the certificate signature algorithm identifier. Otherwise, a fallback hash algorithm is determined as follows: \s-1SHA512\s0 if the signature algorithm is \s-1ED25519, SHAKE256\s0 if it is \s-1ED448,\s0 otherwise \s-1SHA256.\s0 The output parameters are assigned as follows. Unless md_used is \s-1NULL,\s0 the hash algorithm used is provided in *md_used and must be freed by the caller (if it is not \s-1NULL\s0). Unless md_is_fallback is \s-1NULL,\s0 the *md_is_fallback is set to 1 if the hash algorithm used is a fallback, otherwise to 0.

\fBX509_pubkey_digest() returns a digest of the \s-1DER\s0 representation of the public key in the specified X509 data object.

All other functions described here return a digest of the \s-1DER\s0 representation of their entire data objects.

The type parameter specifies the digest to be used, such as EVP_sha1(). The md is a pointer to the buffer where the digest will be copied and is assumed to be large enough; the constant \fB\s-1EVP_MAX_MD_SIZE\s0 is suggested. The len parameter, if not \s-1NULL,\s0 points to a place where the digest size will be stored.

Header "RETURN VALUES" \fBX509_digest_sig() returns an \s-1ASN1_OCTET_STRING\s0 pointer on success, else \s-1NULL.\s0

All other functions described here return 1 for success and 0 for failure.

Header "SEE ALSO" \fBEVP_sha1\|(3) Header "HISTORY" The X509_digest_sig() function was added in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.