/*
 * Derived from:
 *
 * MDDRIVER.C - test driver for MD2, MD4 and MD5
 */

/*
 *  Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
 *  rights reserved.
 *
 *  RSA Data Security, Inc. makes no representations concerning either
 *  the merchantability of this software or the suitability of this
 *  software for any particular purpose. It is provided "as is"
 *  without express or implied warranty of any kind.
 *
 *  These notices must be retained in any copies of any part of this
 *  documentation and/or software.
 */

#include <sys/param.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <md5.h>
#include <osreldate.h>
#include <ripemd.h>
#include <sha.h>
#include <sha224.h>
#include <sha256.h>
#include <sha384.h>
#include <sha512.h>
#include <sha512t.h>
#include <skein.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#ifdef HAVE_CAPSICUM
#include <sys/capsicum.h>
#include <capsicum_helpers.h>
#include <libcasper.h>
#include <casper/cap_fileargs.h>
#endif

/*
 * Length of test block, number of test blocks.
 */
#define TEST_BLOCK_LEN 10000
#define TEST_BLOCK_COUNT 100000
#define MDTESTCOUNT 8

static char *progname;

static bool cflag;
static bool pflag;
static bool qflag;
static bool sflag;
static bool wflag;
static bool strict;
static bool skip;
static bool ignoreMissing;
static char* checkAgainst;
static int checksFailed;
static bool failed;
static int endl = '\n';

typedef void (DIGEST_Init)(void *);
typedef void (DIGEST_Update)(void *, const unsigned char *, size_t);
typedef char *(DIGEST_End)(void *, char *);

extern const char *MD5TestOutput[MDTESTCOUNT];
extern const char *SHA1_TestOutput[MDTESTCOUNT];
extern const char *SHA224_TestOutput[MDTESTCOUNT];
extern const char *SHA256_TestOutput[MDTESTCOUNT];
extern const char *SHA384_TestOutput[MDTESTCOUNT];
extern const char *SHA512_TestOutput[MDTESTCOUNT];
extern const char *SHA512t224_TestOutput[MDTESTCOUNT];
extern const char *SHA512t256_TestOutput[MDTESTCOUNT];
extern const char *RIPEMD160_TestOutput[MDTESTCOUNT];
extern const char *SKEIN256_TestOutput[MDTESTCOUNT];
extern const char *SKEIN512_TestOutput[MDTESTCOUNT];
extern const char *SKEIN1024_TestOutput[MDTESTCOUNT];

typedef struct Algorithm_t {
        const char *progname;
        const char *perlname;
        const char *name;
        const char *(*TestOutput)[MDTESTCOUNT];
        DIGEST_Init *Init;
        DIGEST_Update *Update;
        DIGEST_End *End;
        char *(*Data)(const void *, unsigned int, char *);
} Algorithm_t;

static void MD5_Update(MD5_CTX *, const unsigned char *, size_t);
static char *MDInput(const Algorithm_t *, FILE *, char *, bool);
static void MDOutput(const Algorithm_t *, char *, const char *);
static void MDTimeTrial(const Algorithm_t *);
static void MDTestSuite(const Algorithm_t *);
static void usage(const Algorithm_t *);
static void version(void);

typedef union {
        MD5_CTX md5;
        SHA1_CTX sha1;
        SHA224_CTX sha224;
        SHA256_CTX sha256;
        SHA384_CTX sha384;
        SHA512_CTX sha512;
        RIPEMD160_CTX ripemd160;
        SKEIN256_CTX skein256;
        SKEIN512_CTX skein512;
        SKEIN1024_CTX skein1024;
} DIGEST_CTX;

/* max(MD5_DIGEST_LENGTH, SHA_DIGEST_LENGTH,
        SHA256_DIGEST_LENGTH, SHA512_DIGEST_LENGTH,
        RIPEMD160_DIGEST_LENGTH, SKEIN1024_DIGEST_LENGTH)*2+1 */
#define HEX_DIGEST_LENGTH 257

/* algorithm function table */

static const struct Algorithm_t Algorithm[] = {
        { "md5", NULL, "MD5",
                &MD5TestOutput, (DIGEST_Init*)&MD5Init,
                (DIGEST_Update*)&MD5_Update, (DIGEST_End*)&MD5End,
                &MD5Data },
        { "sha1", "1", "SHA1",
                &SHA1_TestOutput, (DIGEST_Init*)&SHA1_Init,
                (DIGEST_Update*)&SHA1_Update, (DIGEST_End*)&SHA1_End,
                &SHA1_Data },
        { "sha224", "224", "SHA224",
                &SHA224_TestOutput, (DIGEST_Init*)&SHA224_Init,
                (DIGEST_Update*)&SHA224_Update, (DIGEST_End*)&SHA224_End,
                &SHA224_Data },
        { "sha256", "256", "SHA256",
                &SHA256_TestOutput, (DIGEST_Init*)&SHA256_Init,
                (DIGEST_Update*)&SHA256_Update, (DIGEST_End*)&SHA256_End,
                &SHA256_Data },
        { "sha384", "384", "SHA384",
                &SHA384_TestOutput, (DIGEST_Init*)&SHA384_Init,
                (DIGEST_Update*)&SHA384_Update, (DIGEST_End*)&SHA384_End,
                &SHA384_Data },
        { "sha512", "512", "SHA512",
                &SHA512_TestOutput, (DIGEST_Init*)&SHA512_Init,
                (DIGEST_Update*)&SHA512_Update, (DIGEST_End*)&SHA512_End,
                &SHA512_Data },
        { "sha512t224", "512224", "SHA512t224",
                &SHA512t224_TestOutput, (DIGEST_Init*)&SHA512_224_Init,
                (DIGEST_Update*)&SHA512_224_Update, (DIGEST_End*)&SHA512_224_End,
                &SHA512_224_Data },
        { "sha512t256", "512256", "SHA512t256",
                &SHA512t256_TestOutput, (DIGEST_Init*)&SHA512_256_Init,
                (DIGEST_Update*)&SHA512_256_Update, (DIGEST_End*)&SHA512_256_End,
                &SHA512_256_Data },
        { "rmd160", NULL, "RMD160",
                &RIPEMD160_TestOutput,
                (DIGEST_Init*)&RIPEMD160_Init, (DIGEST_Update*)&RIPEMD160_Update,
                (DIGEST_End*)&RIPEMD160_End, &RIPEMD160_Data },
        { "skein256", NULL, "Skein256",
                &SKEIN256_TestOutput,
                (DIGEST_Init*)&SKEIN256_Init, (DIGEST_Update*)&SKEIN256_Update,
                (DIGEST_End*)&SKEIN256_End, &SKEIN256_Data },
        { "skein512", NULL, "Skein512",
                &SKEIN512_TestOutput,
                (DIGEST_Init*)&SKEIN512_Init, (DIGEST_Update*)&SKEIN512_Update,
                (DIGEST_End*)&SKEIN512_End, &SKEIN512_Data },
        { "skein1024", NULL, "Skein1024",
                &SKEIN1024_TestOutput,
                (DIGEST_Init*)&SKEIN1024_Init, (DIGEST_Update*)&SKEIN1024_Update,
                (DIGEST_End*)&SKEIN1024_End, &SKEIN1024_Data },
        { }
};

static int digest = -1;
static unsigned int malformed;

static enum mode {
        mode_bsd,
        mode_gnu,
        mode_perl,
} mode = mode_bsd;

static enum input_mode {
        input_binary     = '*',
        input_text       = ' ',
        input_universal  = 'U',
        input_bits       = '^',
} input_mode = input_binary;

static enum output_mode {
        output_bare,
        output_tagged,
        output_reverse,
        output_gnu,
} output_mode = output_tagged;

enum optval {
        opt_end = -1,
        /* ensure we don't collide with shortopts */
        opt_dummy = CHAR_MAX,
        /* BSD options */
        opt_check,
        opt_passthrough,
        opt_quiet,
        opt_reverse,
        opt_string,
        opt_time_trial,
        opt_self_test,
        /* GNU options */
        opt_binary,
        opt_help,
        opt_ignore_missing,
        opt_status,
        opt_strict,
        opt_tag,
        opt_text,
        opt_warn,
        opt_version,
        opt_zero,
        /* Perl options */
        opt_algorithm,
        opt_bits,
        opt_universal,
};

static const struct option bsd_longopts[] = {
        { "check",              required_argument,      0, opt_check },
        { "passthrough",        no_argument,            0, opt_passthrough },
        { "quiet",              no_argument,            0, opt_quiet },
        { "reverse",            no_argument,            0, opt_reverse },
        { "string",             required_argument,      0, opt_string },
        { "time-trial",         no_argument,            0, opt_time_trial },
        { "self-test",          no_argument,            0, opt_self_test },
        { }
};
static const char *bsd_shortopts = "bc:pqrs:tx";

static const struct option gnu_longopts[] = {
        { "binary",             no_argument,            0, opt_binary },
        { "check",              no_argument,            0, opt_check },
        { "help",               no_argument,            0, opt_help },
        { "ignore-missing",     no_argument,            0, opt_ignore_missing },
        { "quiet",              no_argument,            0, opt_quiet },
        { "status",             no_argument,            0, opt_status },
        { "strict",             no_argument,            0, opt_strict },
        { "tag",                no_argument,            0, opt_tag },
        { "text",               no_argument,            0, opt_text },
        { "version",            no_argument,            0, opt_version },
        { "warn",               no_argument,            0, opt_warn },
        { "zero",               no_argument,            0, opt_zero },
        { }
};
static const char *gnu_shortopts = "bctwz";

static const struct option perl_longopts[] = {
        { "algorithm",          required_argument,      0, opt_algorithm },
        { "binary",             no_argument,            0, opt_binary },
        { "check",              no_argument,            0, opt_check },
        { "help",               no_argument,            0, opt_help },
        { "ignore-missing",     no_argument,            0, opt_ignore_missing },
        { "quiet",              no_argument,            0, opt_quiet },
        { "status",             no_argument,            0, opt_status },
        { "strict",             no_argument,            0, opt_strict },
        { "tag",                no_argument,            0, opt_tag },
        { "text",               no_argument,            0, opt_text },
        { "UNIVERSAL",          no_argument,            0, opt_universal },
        { "version",            no_argument,            0, opt_version },
        { "warn",               no_argument,            0, opt_warn },
        { "01",                 no_argument,            0, opt_bits },
        { }
};
static const char *perl_shortopts = "0a:bchqstUvw";

static void
MD5_Update(MD5_CTX *c, const unsigned char *data, size_t len)
{
        MD5Update(c, data, len);
}

struct chksumrec {
        char *filename;
        enum input_mode input_mode;
        char *chksum;
        struct chksumrec *next;
};

static struct chksumrec *head = NULL;
static struct chksumrec **next = &head;
static unsigned int numrecs;

#define PADDING 7       /* extra padding for "SHA512t256 (...) = ...\n" style */
#define CHKFILELINELEN  (HEX_DIGEST_LENGTH + MAXPATHLEN + PADDING)

static void
gnu_check(const char *checksumsfile)
{
        FILE *inp;
        char *linebuf = NULL;
        size_t linecap;
        ssize_t linelen;
        int lineno;
        char *filename;
        char *hashstr;
        struct chksumrec *rec;
        const char *digestname;
        size_t digestnamelen;
        size_t hashstrlen;
        struct stat st;

        if (strcmp(checksumsfile, "-") == 0)
                inp = stdin;
        else if ((inp = fopen(checksumsfile, "r")) == NULL)
                err(1, "%s", checksumsfile);
        digestname = Algorithm[digest].name;
        digestnamelen = strlen(digestname);
        hashstrlen = strlen(*(Algorithm[digest].TestOutput[0]));
        lineno = 0;
        linecap = CHKFILELINELEN;
        while ((linelen = getline(&linebuf, &linecap, inp)) > 0) {
                lineno++;
                while (linelen > 0 && linebuf[linelen - 1] == '\n')
                        linelen--;
                linebuf[linelen] = '\0';
                filename = linebuf + digestnamelen + 2;
                hashstr = linebuf + linelen - hashstrlen;
                /*
                 * supported formats:
                 * BSD: <DigestName> (<Filename>): <Digest>
                 * GNU: <Digest> [ *U^]<Filename>
                 */
                if ((size_t)linelen >= digestnamelen + hashstrlen + 6 &&
                    strncmp(linebuf, digestname, digestnamelen) == 0 &&
                    strncmp(filename - 2, " (", 2) == 0 &&
                    strncmp(hashstr - 4, ") = ", 4) == 0 &&
                    strspn(hashstr, "0123456789ABCDEFabcdef") == hashstrlen) {
                        *(hashstr - 4) = '\0';
                } else if ((size_t)linelen >= hashstrlen + 3 &&
                    strspn(linebuf, "0123456789ABCDEFabcdef") == hashstrlen &&
                    linebuf[hashstrlen] == ' ') {
                        linebuf[hashstrlen] = '\0';
                        hashstr = linebuf;
                        filename = linebuf + hashstrlen + 1;
                } else {
                        if (wflag) {
                                warnx("%s: %d: improperly formatted "
                                    "%s checksum line",
                                    checksumsfile, lineno,
                                    mode == mode_perl ? "SHA" : digestname);
                        }
                        malformed++;
                        continue;
                }
                rec = malloc(sizeof(*rec));
                if (rec == NULL)
                        errx(1, "malloc failed");

                if ((*filename == '*' || *filename == ' ' ||
                    *filename == 'U' || *filename == '^') &&
                    lstat(filename, &st) != 0 &&
                    lstat(filename + 1, &st) == 0) {
                        rec->filename = strdup(filename + 1);
                        rec->input_mode = (enum input_mode)*filename;
                } else {
                        rec->filename = strdup(filename);
                        rec->input_mode = input_mode;
                }

                rec->chksum = strdup(hashstr);
                if (rec->chksum == NULL || rec->filename == NULL)
                        errx(1, "malloc failed");
                rec->next = NULL;
                *next = rec;
                next = &rec->next;
                numrecs++;
        }
        if (inp != stdin)
                fclose(inp);
}

/* Main driver.

Arguments (may be any combination):
  -sstring - digests string
  -t       - runs time trial
  -x       - runs test script
  filename - digests file
  (none)   - digests standard input
 */
int
main(int argc, char *argv[])
{
#ifdef HAVE_CAPSICUM
        cap_rights_t rights;
        fileargs_t *fa = NULL;
#endif
        const struct option *longopts;
        const char *shortopts;
        FILE *f;
        int i, opt;
        char *p, *string = NULL;
        char buf[HEX_DIGEST_LENGTH];
        size_t len;
        struct chksumrec *rec;

        if ((progname = strrchr(argv[0], '/')) == NULL)
                progname = argv[0];
        else
                progname++;

        /*
         * GNU coreutils has a number of programs named *sum. These produce
         * similar results to the BSD version, but in a different format,
         * similar to BSD's -r flag. We install links to this program with
         * ending 'sum' to provide this compatibility. Check here to see if the
         * name of the program ends in 'sum', set the flag and drop the 'sum' so
         * the digest lookup works. Also, make -t a nop when running in this mode
         * since that means 'text file' there (though it's a nop in coreutils
         * on unix-like systems). The -c flag conflicts, so it's just disabled
         * in this mode (though in the future it might be implemented).
         *
         * We also strive to be compatible with the shasum script which is
         * included in Perl.  It is roughly equivalent to the GNU offering
         * but uses a command-line argument to select the algorithm, and
         * supports only SHA-1 and SHA-2.
         */
        len = strlen(progname);
        if (strcmp(progname, "shasum") == 0) {
                mode = mode_perl;
                input_mode = input_text;
                output_mode = output_gnu;
                digest = 1;
                longopts = perl_longopts;
                shortopts = perl_shortopts;
        } else if (len > 3 && strcmp(progname + len - 3, "sum") == 0) {
                len -= 3;
                mode = mode_gnu;
                input_mode = input_text;
                /*
                 * The historical behavior in GNU emulation mode is
                 * output_reverse, however this not true to the original
                 * and the flag that was used to force the correct output
                 * was -b, which means something else (input_binary) in
                 * GNU land.  Switch to the correct behavior.
                 */
                output_mode = output_gnu;
                longopts = gnu_longopts;
                shortopts = gnu_shortopts;
        } else {
                mode = mode_bsd;
                input_mode = input_binary;
                output_mode = output_tagged;
                longopts = bsd_longopts;
                shortopts = bsd_shortopts;
        }

        if (digest < 0) {
                for (digest = 0; Algorithm[digest].progname != NULL; digest++)
                        if (strncasecmp(Algorithm[digest].progname, progname, len) == 0)
                                break;

                if (Algorithm[digest].progname == NULL)
                        digest = 0;
        }

        failed = false;
        checkAgainst = NULL;
        checksFailed = 0;
        skip = false;
        while ((opt = getopt_long(argc, argv, shortopts, longopts, NULL)) != opt_end)
                switch (opt) {
                case opt_bits:
                case '0':
                        input_mode = input_bits;
                        break;
                case opt_algorithm:
                case 'a':
                        for (i = 0; Algorithm[i].progname != NULL; i++) {
                                if (Algorithm[i].perlname != NULL &&
                                    strcasecmp(Algorithm[i].perlname, optarg) == 0) {
                                        digest = i;
                                        break;
                                }
                        }
                        if (Algorithm[i].progname == NULL)
                                usage(&Algorithm[digest]);
                        break;
                case opt_binary:
                case 'b':
                        /* in BSD mode, -b is now a no-op */
                        if (mode != mode_bsd)
                                input_mode = input_binary;
                        break;
                case opt_check:
                case 'c':
                        cflag = true;
                        if (mode == mode_bsd)
                                checkAgainst = optarg;
                        break;
                case opt_passthrough:
                case 'p':
                        pflag = true;
                        break;
                case opt_quiet:
                case 'q':
                        output_mode = output_bare;
                        qflag = true;
                        break;
                case opt_reverse:
                case 'r':
                        if (!qflag)
                                output_mode = output_reverse;
                        break;
                case opt_status:
                        sflag = true;
                        break;
                case opt_strict:
                        strict = 1;
                        break;
                case 's':
                        if (mode == mode_perl) {
                                sflag = true;
                                break;
                        }
                        /* fall through */
                case opt_string:
                        output_mode = output_bare;
                        string = optarg;
                        break;
                case opt_tag:
                        output_mode = output_tagged;
                        break;
                case opt_time_trial:
                case opt_text:
                case 't':
                        if (mode == mode_bsd) {
                                MDTimeTrial(&Algorithm[digest]);
                                skip = true;
                        } else {
                                input_mode = input_text;
                        }
                        break;
                case opt_universal:
                case 'U':
                        input_mode = input_universal;
                        break;
                case opt_version:
                        version();
                        break;
                case opt_warn:
                case 'w':
                        wflag = true;
                        break;
                case opt_self_test:
                case 'x':
                        MDTestSuite(&Algorithm[digest]);
                        skip = true;
                        break;
                case opt_zero:
                case 'z':
                        endl = '\0';
                        break;
                case opt_ignore_missing:
                        ignoreMissing = true;
                        break;
                default:
                        usage(&Algorithm[digest]);
                }
        argc -= optind;
        argv += optind;

#ifdef HAVE_CAPSICUM
        if (caph_limit_stdio() < 0)
                err(1, "unable to limit rights for stdio");
#endif

        if (cflag && mode != mode_bsd) {
                /*
                 * Read digest files into a linked list, then replace argv
                 * with an array of the filenames from that list.
                 */
                if (argc < 1)
                        usage(&Algorithm[digest]);
                while (argc--)
                        gnu_check(*argv++);
                argc = 0;
                argv = calloc(numrecs + 1, sizeof(char *));
                for (rec = head; rec != NULL; rec = rec->next) {
                        argv[argc] = rec->filename;
                        argc++;
                }
                argv[argc] = NULL;
                rec = head;
        }

#ifdef HAVE_CAPSICUM
        fa = fileargs_init(argc, argv, O_RDONLY, 0,
            cap_rights_init(&rights, CAP_READ, CAP_FSTAT, CAP_FCNTL), FA_OPEN | FA_LSTAT);
        if (fa == NULL)
                err(1, "Unable to initialize casper");
        if (caph_enter_casper() < 0)
                err(1, "Unable to enter capability mode");
#endif

        if (*argv && !pflag && string == NULL) {
                do {
                        const char *filename = *argv;
                        const char *filemode = "rb";

                        if (cflag && mode != mode_bsd) {
                                input_mode = rec->input_mode;
                                checkAgainst = rec->chksum;
                                rec = rec->next;
                        }
                        if (input_mode == input_text)
                                filemode = "r";
                        if (strcmp(filename, "-") == 0) {
                                f = stdin;
                        } else {
#ifdef HAVE_CAPSICUM
                                f = fileargs_fopen(fa, filename, filemode);
#else
                                f = fopen(filename, filemode);
#endif
                        }
                        if (f == NULL) {
                                if (errno != ENOENT || !(cflag && ignoreMissing)) {
                                        warn("%s", filename);
                                        failed = true;
                                }
                                continue;
                        }
                        p = MDInput(&Algorithm[digest], f, buf, false);
                        if (f != stdin)
                                (void)fclose(f);
                        MDOutput(&Algorithm[digest], p, filename);
                } while (*++argv);
        } else if (!cflag && string == NULL && !skip) {
                if (mode == mode_bsd)
                        output_mode = output_bare;
                p = MDInput(&Algorithm[digest], stdin, buf, pflag);
                MDOutput(&Algorithm[digest], p, "-");
        } else if (string != NULL) {
                len = strlen(string);
                p = Algorithm[digest].Data(string, len, buf);
                MDOutput(&Algorithm[digest], p, string);
        }
        if (cflag && mode != mode_bsd) {
                if (!sflag && malformed > 1)
                        warnx("WARNING: %d lines are improperly formatted", malformed);
                else if (!sflag && malformed > 0)
                        warnx("WARNING: %d line is improperly formatted", malformed);
                if (!sflag && checksFailed > 1)
                        warnx("WARNING: %d computed checksums did NOT match", checksFailed);
                else if (!sflag && checksFailed > 0)
                        warnx("WARNING: %d computed checksum did NOT match", checksFailed);
                if (checksFailed != 0 || (strict && malformed > 0))
                        return (1);
        }
#ifdef HAVE_CAPSICUM
        fileargs_free(fa);
#endif
        if (failed)
                return (1);
        if (checksFailed > 0)
                return (2);

        return (0);
}

/*
 * Common input handling
 */
static char *
MDInput(const Algorithm_t *alg, FILE *f, char *buf, bool tee)
{
        char block[4096];
        DIGEST_CTX context;
        char *end, *p, *q;
        size_t len;
        int bits;
        uint8_t byte;
        bool cr = false;

        alg->Init(&context);
        while ((len = fread(block, 1, sizeof(block), f)) > 0) {
                switch (input_mode) {
                case input_binary:
                case input_text:
                        if (tee && fwrite(block, 1, len, stdout) != len)
                                err(1, "stdout");
                        alg->Update(&context, block, len);
                        break;
                case input_universal:
                        end = block + len;
                        for (p = q = block; p < end; p = q) {
                                if (cr) {
                                        if (*p == '\n')
                                                p++;
                                        if (tee && putchar('\n') == EOF)
                                                err(1, "stdout");
                                        alg->Update(&context, "\n", 1);
                                        cr = false;
                                }
                                for (q = p; q < end && *q != '\r'; q++)
                                        /* nothing */;
                                if (q > p) {
                                        if (tee &&
                                            fwrite(p, 1, q - p, stdout) !=
                                            (size_t)(q - p))
                                                err(1, "stdout");
                                        alg->Update(&context, p, q - p);
                                }
                                if (q < end && *q == '\r') {
                                        cr = true;
                                        q++;
                                }
                        }
                        break;
                case input_bits:
                        end = block + len;
                        bits = byte = 0;
                        for (p = block; p < end; p++) {
                                if (*p == '0' || *p == '1') {
                                        byte <<= 1;
                                        byte |= *p - '0';
                                        if (++bits == 8) {
                                                if (tee && putchar(byte) == EOF)
                                                        err(1, "stdout");
                                                alg->Update(&context, &byte, 1);
                                                bits = byte = 0;
                                        }
                                }
                        }
                        break;
                }
        }
        if (ferror(f)) {
                alg->End(&context, buf);
                return (NULL);
        }
        if (cr) {
                if (tee && putchar('\n') == EOF)
                        err(1, "stdout");
                alg->Update(&context, "\n", 1);
        }
        if (input_mode == input_bits && bits != 0)
                errx(1, "input length was not a multiple of 8");
        return (alg->End(&context, buf));
}

/*
 * Common output handling
 */
static void
MDOutput(const Algorithm_t *alg, char *p, const char *name)
{
        bool checkfailed = false;

        if (p == NULL) {
                warn("%s", name);
                failed = true;
        } else if (cflag && mode != mode_bsd) {
                checkfailed = strcasecmp(checkAgainst, p) != 0;
                if (!sflag && (!qflag || checkfailed))
                        printf("%s: %s%c", name, checkfailed ? "FAILED" : "OK",
                            endl);
        } else {
                switch (output_mode) {
                case output_bare:
                        printf("%s", p);
                        break;
                case output_gnu:
                        printf("%s %c%s", p, input_mode, name);
                        break;
                case output_reverse:
                        printf("%s %s", p, name);
                        break;
                case output_tagged:
                        if (mode == mode_perl &&
                            strncmp(alg->name, "SHA512t", 7) == 0) {
                                printf("%.6s/%s", alg->name, alg->name + 7);
                        } else {
                                printf("%s", alg->name);
                        }
                        printf(" (%s) = %s", name, p);
                        break;
                }
                if (checkAgainst) {
                        checkfailed = strcasecmp(checkAgainst, p) != 0;
                        if (!qflag && checkfailed)
                                printf(" [ Failed ]");
                }
                printf("%c", endl);
        }
        if (checkfailed)
                checksFailed++;
}

/*
 * Measures the time to digest TEST_BLOCK_COUNT TEST_BLOCK_LEN-byte blocks.
 */
static void
MDTimeTrial(const Algorithm_t *alg)
{
        DIGEST_CTX context;
        struct rusage before, after;
        struct timeval total;
        float seconds;
        unsigned char block[TEST_BLOCK_LEN];
        unsigned int i;
        char *p, buf[HEX_DIGEST_LENGTH];

        printf("%s time trial. Digesting %d %d-byte blocks ...",
            alg->name, TEST_BLOCK_COUNT, TEST_BLOCK_LEN);
        fflush(stdout);

        /* Initialize block */
        for (i = 0; i < TEST_BLOCK_LEN; i++)
                block[i] = (unsigned char) (i & 0xff);

        /* Start timer */
        getrusage(RUSAGE_SELF, &before);

        /* Digest blocks */
        alg->Init(&context);
        for (i = 0; i < TEST_BLOCK_COUNT; i++)
                alg->Update(&context, block, TEST_BLOCK_LEN);
        p = alg->End(&context, buf);

        /* Stop timer */
        getrusage(RUSAGE_SELF, &after);
        timersub(&after.ru_utime, &before.ru_utime, &total);
        seconds = total.tv_sec + (float) total.tv_usec / 1000000;

        printf(" done\n");
        printf("Digest = %s", p);
        printf("\nTime = %f seconds\n", seconds);
        printf("Speed = %f MiB/second\n", (float) TEST_BLOCK_LEN *
                (float) TEST_BLOCK_COUNT / seconds / (1 << 20));
}
/*
 * Digests a reference suite of strings and prints the results.
 */

static const char *MDTestInput[MDTESTCOUNT] = {
        "",
        "a",
        "abc",
        "message digest",
        "abcdefghijklmnopqrstuvwxyz",
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
        "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
        "MD5 has not yet (2001-09-03) been broken, but sufficient attacks have been made \
that its security is in some doubt"
};

const char *MD5TestOutput[MDTESTCOUNT] = {
        "d41d8cd98f00b204e9800998ecf8427e",
        "0cc175b9c0f1b6a831c399e269772661",
        "900150983cd24fb0d6963f7d28e17f72",
        "f96b697d7cb7938d525a2f31aaf161d0",
        "c3fcd3d76192e4007dfb496cca67e13b",
        "d174ab98d277d9f5a5611c2c9f419d9f",
        "57edf4a22be3c955ac49da2e2107b67a",
        "b50663f41d44d92171cb9976bc118538"
};

const char *SHA1_TestOutput[MDTESTCOUNT] = {
        "da39a3ee5e6b4b0d3255bfef95601890afd80709",
        "86f7e437faa5a7fce15d1ddcb9eaeaea377667b8",
        "a9993e364706816aba3e25717850c26c9cd0d89d",
        "c12252ceda8be8994d5fa0290a47231c1d16aae3",
        "32d10c7b8cf96570ca04ce37f2a19d84240d3a89",
        "761c457bf73b14d27e9e9265c46f4b4dda11f940",
        "50abf5706a150990a08b2c5ea40fa0e585554732",
        "18eca4333979c4181199b7b4fab8786d16cf2846"
};

const char *SHA224_TestOutput[MDTESTCOUNT] = {
        "d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f",
        "abd37534c7d9a2efb9465de931cd7055ffdb8879563ae98078d6d6d5",
        "23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7",
        "2cb21c83ae2f004de7e81c3c7019cbcb65b71ab656b22d6d0c39b8eb",
        "45a5f72c39c5cff2522eb3429799e49e5f44b356ef926bcf390dccc2",
        "bff72b4fcb7d75e5632900ac5f90d219e05e97a7bde72e740db393d9",
        "b50aecbe4e9bb0b57bc5f3ae760a8e01db24f203fb3cdcd13148046e",
        "5ae55f3779c8a1204210d7ed7689f661fbe140f96f272ab79e19d470"
};

const char *SHA256_TestOutput[MDTESTCOUNT] = {
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
        "ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb",
        "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad",
        "f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650",
        "71c480df93d6ae2f1efad1447c66c9525e316218cf51fc8d9ed832f2daf18b73",
        "db4bfcbd4da0cd85a60c3c37d3fbd8805c77f15fc6b1fdfe614ee0a7c8fdb4c0",
        "f371bc4a311f2b009eef952dd83ca80e2b60026c8e935592d0f9c308453c813e",
        "e6eae09f10ad4122a0e2a4075761d185a272ebd9f5aa489e998ff2f09cbfdd9f"
};

const char *SHA384_TestOutput[MDTESTCOUNT] = {
        "38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b",
        "54a59b9f22b0b80880d8427e548b7c23abd873486e1f035dce9cd697e85175033caa88e6d57bc35efae0b5afd3145f31",
        "cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed8086072ba1e7cc2358baeca134c825a7",
        "473ed35167ec1f5d8e550368a3db39be54639f828868e9454c239fc8b52e3c61dbd0d8b4de1390c256dcbb5d5fd99cd5",
        "feb67349df3db6f5924815d6c3dc133f091809213731fe5c7b5f4999e463479ff2877f5f2936fa63bb43784b12f3ebb4",
        "1761336e3f7cbfe51deb137f026f89e01a448e3b1fafa64039c1464ee8732f11a5341a6f41e0c202294736ed64db1a84",
        "b12932b0627d1c060942f5447764155655bd4da0c9afa6dd9b9ef53129af1b8fb0195996d2de9ca0df9d821ffee67026",
        "99428d401bf4abcd4ee0695248c9858b7503853acfae21a9cffa7855f46d1395ef38596fcd06d5a8c32d41a839cc5dfb"
};

const char *SHA512_TestOutput[MDTESTCOUNT] = {
        "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e",
        "1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75",
        "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f",
        "107dbf389d9e9f71a3a95f6c055b9251bc5268c2be16d6c13492ea45b0199f3309e16455ab1e96118e8a905d5597b72038ddb372a89826046de66687bb420e7c",
        "4dbff86cc2ca1bae1e16468a05cb9881c97f1753bce3619034898faa1aabe429955a1bf8ec483d7421fe3c1646613a59ed5441fb0f321389f77f48a879c7b1f1",
        "1e07be23c26a86ea37ea810c8ec7809352515a970e9253c26f536cfc7a9996c45c8370583e0a78fa4a90041d71a4ceab7423f19c71b9d5a3e01249f0bebd5894",
        "72ec1ef1124a45b047e8b7c75a932195135bb61de24ec0d1914042246e0aec3a2354e093d76f3048b456764346900cb130d2a4fd5dd16abb5e30bcb850dee843",
        "e8a835195e039708b13d9131e025f4441dbdc521ce625f245a436dcd762f54bf5cb298d96235e6c6a304e087ec8189b9512cbdf6427737ea82793460c367b9c3"
};

const char *SHA512t224_TestOutput[MDTESTCOUNT] = {
        "6ed0dd02806fa89e25de060c19d3ac86cabb87d6a0ddd05c333b84f4",
        "d5cdb9ccc769a5121d4175f2bfdd13d6310e0d3d361ea75d82108327",
        "4634270f707b6a54daae7530460842e20e37ed265ceee9a43e8924aa",
        "ad1a4db188fe57064f4f24609d2a83cd0afb9b398eb2fcaeaae2c564",
        "ff83148aa07ec30655c1b40aff86141c0215fe2a54f767d3f38743d8",
        "a8b4b9174b99ffc67d6f49be9981587b96441051e16e6dd036b140d3",
        "ae988faaa47e401a45f704d1272d99702458fea2ddc6582827556dd2",
        "b3c3b945249b0c8c94aba76ea887bcaad5401665a1fbeb384af4d06b"
};

const char *SHA512t256_TestOutput[MDTESTCOUNT] = {
        "c672b8d1ef56ed28ab87c3622c5114069bdd3ad7b8f9737498d0c01ecef0967a",
        "455e518824bc0601f9fb858ff5c37d417d67c2f8e0df2babe4808858aea830f8",
        "53048e2681941ef99b2e29b76b4c7dabe4c2d0c634fc6d46e0e2f13107e7af23",
        "0cf471fd17ed69d990daf3433c89b16d63dec1bb9cb42a6094604ee5d7b4e9fb",
        "fc3189443f9c268f626aea08a756abe7b726b05f701cb08222312ccfd6710a26",
        "cdf1cc0effe26ecc0c13758f7b4a48e000615df241284185c39eb05d355bb9c8",
        "2c9fdbc0c90bdd87612ee8455474f9044850241dc105b1e8b94b8ddf5fac9148",
        "dd095fc859b336c30a52548b3dc59fcc0d1be8616ebcf3368fad23107db2d736"
};

const char *RIPEMD160_TestOutput[MDTESTCOUNT] = {
        "9c1185a5c5e9fc54612808977ee8f548b2258d31",
        "0bdc9d2d256b3ee9daae347be6f4dc835a467ffe",
        "8eb208f7e05d987a9b044a8e98c6b087f15a0bfc",
        "5d0689ef49d2fae572b881b123a85ffa21595f36",
        "f71c27109c692c1b56bbdceb5b9d2865b3708dbc",
        "b0e20b6e3116640286ed3a87a5713079b21f5189",
        "9b752e45573d4b39f4dbd3323cab82bf63326bfb",
        "5feb69c6bf7c29d95715ad55f57d8ac5b2b7dd32"
};

const char *SKEIN256_TestOutput[MDTESTCOUNT] = {
        "c8877087da56e072870daa843f176e9453115929094c3a40c463a196c29bf7ba",
        "7fba44ff1a31d71a0c1f82e6e82fb5e9ac6c92a39c9185b9951fed82d82fe635",
        "258bdec343b9fde1639221a5ae0144a96e552e5288753c5fec76c05fc2fc1870",
        "4d2ce0062b5eb3a4db95bc1117dd8aa014f6cd50fdc8e64f31f7d41f9231e488",
        "46d8440685461b00e3ddb891b2ecc6855287d2bd8834a95fb1c1708b00ea5e82",
        "7c5eb606389556b33d34eb2536459528dc0af97adbcd0ce273aeb650f598d4b2",
        "4def7a7e5464a140ae9c3a80279fbebce4bd00f9faad819ab7e001512f67a10d",
        "d9c017dbe355f318d036469eb9b5fbe129fc2b5786a9dc6746a516eab6fe0126"
};

const char *SKEIN512_TestOutput[MDTESTCOUNT] = {
        "bc5b4c50925519c290cc634277ae3d6257212395cba733bbad37a4af0fa06af41fca7903d06564fea7a2d3730dbdb80c1f85562dfcc070334ea4d1d9e72cba7a",
        "b1cd8d33f61b3737adfd59bb13ad82f4a9548e92f22956a8976cca3fdb7fee4fe91698146c4197cec85d38b83c5d93bdba92c01fd9a53870d0c7f967bc62bdce",
        "8f5dd9ec798152668e35129496b029a960c9a9b88662f7f9482f110b31f9f93893ecfb25c009baad9e46737197d5630379816a886aa05526d3a70df272d96e75",
        "15b73c158ffb875fed4d72801ded0794c720b121c0c78edf45f900937e6933d9e21a3a984206933d504b5dbb2368000411477ee1b204c986068df77886542fcc",
        "23793ad900ef12f9165c8080da6fdfd2c8354a2929b8aadf83aa82a3c6470342f57cf8c035ec0d97429b626c4d94f28632c8f5134fd367dca5cf293d2ec13f8c",
        "0c6bed927e022f5ddcf81877d42e5f75798a9f8fd3ede3d83baac0a2f364b082e036c11af35fe478745459dd8f5c0b73efe3c56ba5bb2009208d5a29cc6e469c",
        "2ca9fcffb3456f297d1b5f407014ecb856f0baac8eb540f534b1f187196f21e88f31103128c2f03fcc9857d7a58eb66f9525e2302d88833ee069295537a434ce",
        "1131f2aaa0e97126c9314f9f968cc827259bbfabced2943bb8c9274448998fb3b78738b4580dd500c76105fd3c03e465e1414f2c29664286b1f79d3e51128125"
};

const char *SKEIN1024_TestOutput[MDTESTCOUNT] = {
        "0fff9563bb3279289227ac77d319b6fff8d7e9f09da1247b72a0a265cd6d2a62645ad547ed8193db48cff847c06494a03f55666d3b47eb4c20456c9373c86297d630d5578ebd34cb40991578f9f52b18003efa35d3da6553ff35db91b81ab890bec1b189b7f52cb2a783ebb7d823d725b0b4a71f6824e88f68f982eefc6d19c6",
        "6ab4c4ba9814a3d976ec8bffa7fcc638ceba0544a97b3c98411323ffd2dc936315d13dc93c13c4e88cda6f5bac6f2558b2d8694d3b6143e40d644ae43ca940685cb37f809d3d0550c56cba8036dee729a4f8fb960732e59e64d57f7f7710f8670963cdcdc95b41daab4855fcf8b6762a64b173ee61343a2c7689af1d293eba97",
        "35a599a0f91abcdb4cb73c19b8cb8d947742d82c309137a7caed29e8e0a2ca7a9ff9a90c34c1908cc7e7fd99bb15032fb86e76df21b72628399b5f7c3cc209d7bb31c99cd4e19465622a049afbb87c03b5ce3888d17e6e667279ec0aa9b3e2712624c01b5f5bbe1a564220bdcf6990af0c2539019f313fdd7406cca3892a1f1f",
        "ea891f5268acd0fac97467fc1aa89d1ce8681a9992a42540e53babee861483110c2d16f49e73bac27653ff173003e40cfb08516cd34262e6af95a5d8645c9c1abb3e813604d508b8511b30f9a5c1b352aa0791c7d2f27b2706dccea54bc7de6555b5202351751c3299f97c09cf89c40f67187e2521c0fad82b30edbb224f0458",
        "f23d95c2a25fbcd0e797cd058fec39d3c52d2b5afd7a9af1df934e63257d1d3dcf3246e7329c0f1104c1e51e3d22e300507b0c3b9f985bb1f645ef49835080536becf83788e17fed09c9982ba65c3cb7ffe6a5f745b911c506962adf226e435c42f6f6bc08d288f9c810e807e3216ef444f3db22744441deefa4900982a1371f",
        "cf3889e8a8d11bfd3938055d7d061437962bc5eac8ae83b1b71c94be201b8cf657fdbfc38674997a008c0c903f56a23feb3ae30e012377f1cfa080a9ca7fe8b96138662653fb3335c7d06595bf8baf65e215307532094cfdfa056bd8052ab792a3944a2adaa47b30335b8badb8fe9eb94fe329cdca04e58bbc530f0af709f469",
        "cf21a613620e6c119eca31fdfaad449a8e02f95ca256c21d2a105f8e4157048f9fe1e897893ea18b64e0e37cb07d5ac947f27ba544caf7cbc1ad094e675aed77a366270f7eb7f46543bccfa61c526fd628408058ed00ed566ac35a9761d002e629c4fb0d430b2f4ad016fcc49c44d2981c4002da0eecc42144160e2eaea4855a",
        "e6799b78db54085a2be7ff4c8007f147fa88d326abab30be0560b953396d8802feee9a15419b48a467574e9283be15685ca8a079ee52b27166b64dd70b124b1d4e4f6aca37224c3f2685e67e67baef9f94b905698adc794a09672aba977a61b20966912acdb08c21a2c37001785355dc884751a21f848ab36e590331ff938138"
};

static void
MDTestSuite(const Algorithm_t *alg)
{
        int i;
        char buffer[HEX_DIGEST_LENGTH];

        printf("%s test suite:\n", alg->name);
        for (i = 0; i < MDTESTCOUNT; i++) {
                (*alg->Data)(MDTestInput[i], strlen(MDTestInput[i]), buffer);
                printf("%s (\"%s\") = %s", alg->name, MDTestInput[i], buffer);
                if (strcmp(buffer, (*alg->TestOutput)[i]) == 0) {
                        printf(" - verified correct\n");
                } else {
                        printf(" - INCORRECT RESULT!\n");
                        failed = true;
                }
        }
}

static void
usage(const Algorithm_t *alg)
{

        switch (mode) {
        case mode_gnu:
                fprintf(stderr, "usage: %ssum [-bctwz] [files ...]\n", alg->progname);
                break;
        case mode_perl:
                fprintf(stderr, "usage: shasum [-0bchqstUvw] [-a alg] [files ...]\n");
                break;
        default:
                fprintf(stderr, "usage: %s [-pqrtx] [-c string] [-s string] [files ...]\n",
                    alg->progname);
        }
        exit(1);
}

static void
version(void)
{
        if (mode == mode_gnu)
                printf("%s (FreeBSD) ", progname);
        printf("%d.%d\n",
            __FreeBSD_version / 100000,
            (__FreeBSD_version / 1000) % 100);
        exit(0);
}