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Command: ASN1_item_digest | Section: 3 | Source: OpenBSD | File: ASN1_item_digest.3
ASN1_ITEM_DIGEST(3) FreeBSD Library Functions Manual ASN1_ITEM_DIGEST(3)
NAME
ASN1_item_digest - DER-encode and hash an ASN.1 value
SYNOPSIS
#include <openssl/x509.h>
int
ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *type, void *val_in,
unsigned char *md, unsigned int *s);
DESCRIPTION
ASN1_item_digest() assumes that val_in is an ASN1_VALUE of the type
specified by it, encodes it into DER format by calling ASN1_item_i2d(3),
hashes the resulting byte array using the digest type by calling
EVP_Digest(3), places the digest value into *md, and, unless s is NULL,
places the length in bytes of the digest into *s. Providing a buffer *md
large enough to contain the digest is the responsibility of the caller;
providing a buffer of EVP_MAX_MD_SIZE bytes is recommended.
RETURN VALUES
ASN1_item_digest() returns 1 for success or 0 if encoding or hashing
fails.
SEE ALSO
ASN1_item_i2d(3), ASN1_item_sign(3), EVP_Digest(3)
HISTORY
ASN1_item_digest() first appeared in OpenSSL 0.9.7 and has been available
since OpenBSD 3.1.
FreeBSD 14.1-RELEASE-p8 September 11, 2022 FreeBSD 14.1-RELEASE-p8