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/*
 * Copyright (C) 1997-2000 Sensus Consulting Ltd.
 * Matt Newman <matt@sensus.org>
 * Copyright (C) 2023 Brian O'Hagan
 */
#include <tcl.h>
#include <stdio.h>
#include <openssl/bio.h>
#include <openssl/sha.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>
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    char certStr[CERT_STR_SIZE], *certStr_p;
    int certStr_len, toRead;
    char sha1_hash_ascii[SHA_DIGEST_LENGTH * 2 + 1];
    unsigned char sha1_hash_binary[SHA_DIGEST_LENGTH];
    char sha256_hash_ascii[SHA256_DIGEST_LENGTH * 2 + 1];
    unsigned char sha256_hash_binary[SHA256_DIGEST_LENGTH];
    const char *shachars="0123456789ABCDEF";
    int nid, pknid, bits;
    long version;
    uint32_t xflags;

    sha1_hash_ascii[SHA_DIGEST_LENGTH * 2] = '\0';
    sha256_hash_ascii[SHA256_DIGEST_LENGTH * 2] = '\0';

    certStr[0] = 0;
    if ((bio = BIO_new(BIO_s_mem())) == NULL) {
	subject[0] = 0;
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	BIO_free(bio);
    }

    strcpy(notBefore, ASN1_UTCTIME_tostr(X509_getm_notBefore(cert)));
    strcpy(notAfter, ASN1_UTCTIME_tostr(X509_getm_notAfter(cert)));

    /* Version */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("version", -1));
    version = X509_get_version(cert)+1;
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewLongObj(version));

    /* Signature NID */
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("signature_nid", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(X509_get_signature_nid(cert)));
 
    if (X509_get_signature_info(cert, &nid, &pknid, &bits, &xflags) == 1) {
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("digest_nid", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(nid));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("public_key_nid", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(pknid));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("bits", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(bits));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("extension_flags", -1));
	Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewIntObj(xflags));
    }
 
    /* SHA1 */
    /* SHA1 - DER representation*/
    X509_digest(cert, EVP_sha1(), sha1_hash_binary, NULL);
    for (int n = 0; n < SHA_DIGEST_LENGTH; n++) {
        sha1_hash_ascii[n*2]   = shachars[(sha1_hash_binary[n] & 0xF0) >> 4];
        sha1_hash_ascii[n*2+1] = shachars[(sha1_hash_binary[n] & 0x0F)];
    }
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj("sha1_hash", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj(sha1_hash_ascii, SHA_DIGEST_LENGTH * 2) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha1_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj(sha1_hash_ascii, SHA_DIGEST_LENGTH * 2));

    /* SHA256 */
    /* SHA256 - DER representation */
    X509_digest(cert, EVP_sha256(), sha256_hash_binary, NULL);
    for (int n = 0; n < SHA256_DIGEST_LENGTH; n++) {
	sha256_hash_ascii[n*2]   = shachars[(sha256_hash_binary[n] & 0xF0) >> 4];
	sha256_hash_ascii[n*2+1] = shachars[(sha256_hash_binary[n] & 0x0F)];
    }
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "sha256_hash", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( sha256_hash_ascii, SHA256_DIGEST_LENGTH * 2) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("sha256_hash", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( sha256_hash_ascii, SHA256_DIGEST_LENGTH * 2));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "subject", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( subject, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("subject", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( subject, -1));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "issuer", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( issuer, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("issuer", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( issuer, -1));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "notBefore", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( notBefore, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notBefore", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( notBefore, -1));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "notAfter", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( notAfter, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("notAfter", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( notAfter, -1));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "serial", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( serial, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("serial", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( serial, -1));

    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( "certificate", -1) );
    Tcl_ListObjAppendElement( interp, certPtr, Tcl_NewStringObj( certStr, -1) );
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj("certificate", -1));
    Tcl_ListObjAppendElement(interp, certPtr, Tcl_NewStringObj( certStr, -1));

    return certPtr;
}
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