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
HISTORY
ASN1_item_digest() first appeared in
OpenSSL 0.9.7 and has been available since OpenBSD
3.1.