Initial commit

2 files changed, 998 insertions, 0 deletions

diff --git a/src/sw/hash.c b/src/sw/hash.c
new file mode 100644
index 0000000..2314fe4
--- /dev/null
+++ b/src/sw/hash.c
@@ -0,0 +1,310 @@
+/* 
+ * hash.c
+ * ------
+ * This program uses the coretest_hashes subsystem to produce a
+ * cryptographic hash of a file or input stream. It is a generalization
+ * of the hash_tester.c test program.
+ * 
+ * Author: Paul Selkirk
+ * Copyright (c) 2014, SUNET
+ * 
+ * Redistribution and use in source and binary forms, with or 
+ * without modification, are permitted provided that the following 
+ * conditions are met: 
+ * 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in 
+ *    the documentation and/or other materials provided with the 
+ *    distribution. 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/time.h>
+#include <linux/i2c-dev.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <ctype.h>
+
+char *usage = 
+"Usage: %s [-d] [-v] [-q] [-i I2C_device] [-a I2C_addr] [algorithm [file]]\n"
+"algorithms: sha-1, sha-256, sha-512/224, sha-512/256, sha-384, sha-512\n";
+
+/* I2C configuration */
+#define I2C_dev  "/dev/i2c-2"
+
+int debug = 0;
+int verbose = 0;
+
+/* block and digest lengths are number of 32-bit words */
+#define SHA1_BLOCK_LEN          16
+#define SHA1_DIGEST_LEN         5
+#define SHA256_BLOCK_LEN        16
+#define SHA256_DIGEST_LEN       8
+#define SHA512_BLOCK_LEN        32
+#define SHA512_224_DIGEST_LEN   7
+#define SHA512_256_DIGEST_LEN   8
+#define SHA384_DIGEST_LEN       12
+#define SHA512_DIGEST_LEN       16
+
+/* ---------------- algorithm lookup code ---------------- */
+
+struct ctrl {
+    char *name;
+    int i2c_addr;
+    int block_len;
+    int digest_len;
+} ctrl[] = {
+    { "sha-1",       0x1e, SHA1_BLOCK_LEN,   SHA1_DIGEST_LEN },
+    { "sha-256",     0x1f, SHA256_BLOCK_LEN, SHA256_DIGEST_LEN },
+    { "sha-512/224", 0x20, SHA512_BLOCK_LEN, SHA512_224_DIGEST_LEN },
+    { "sha-512/256", 0x21, SHA512_BLOCK_LEN, SHA512_256_DIGEST_LEN },
+    { "sha-384",     0x22, SHA512_BLOCK_LEN, SHA384_DIGEST_LEN },
+    { "sha-512",     0x23, SHA512_BLOCK_LEN, SHA512_DIGEST_LEN },
+    { NULL, 0, 0, 0 }
+};
+
+/* return the control structure for the given algorithm */
+struct ctrl *find_algo(char *algo)
+{
+    int i;
+
+    for (i = 0; ctrl[i].name != NULL; ++i)
+        if (strcmp(ctrl[i].name, algo) == 0)
+            return &ctrl[i];
+
+    fprintf(stderr, "algorithm \"%s\" not found\n", algo);
+    fprintf(stderr, usage, "hash");
+    return NULL;
+}
+
+/* ---------------- I2C low-level code ---------------- */
+
+/* return file descriptor for i2c device */
+int i2c_open(char *dev, int addr)
+{
+    int fd;
+
+    fd = open(dev, O_RDWR);
+    if (fd < 0) {
+        fprintf(stderr, "Unable to open %s: ", dev);
+        perror("");
+        return -1;
+    }
+
+    if (ioctl(fd, I2C_SLAVE, addr) < 0) {
+        fprintf(stderr, "Unable to set I2C slave device 0x%02x: ", addr);
+        perror("");
+        close(fd);
+        return -1;
+    }
+
+    return fd;
+}
+
+void i2c_close(int ifd)
+{
+    close(ifd);
+}
+
+/* ---------------- hash ---------------- */
+
+/* return number of digest bytes read */
+int hash(char *dev, char *algo, char *file, uint8_t *digest)
+{
+    uint8_t block[SHA512_BLOCK_LEN * 4];
+    struct ctrl *ctrl;
+    int i2c_fd, in_fd = 0;
+    int addr, blen, dlen;
+    int nblk, nread;
+    int i, ret = -1;
+    struct timeval start, stop, difftime;
+
+    if (debug) printf("hash(dev=%s, algo=%s, file=%s, digest=%p)\n", dev, algo, file, digest);
+
+    ctrl = find_algo(algo);
+    if (ctrl == NULL)
+        return -1;
+    addr = ctrl->i2c_addr;
+    blen = ctrl->block_len * 4;
+    dlen = ctrl->digest_len * 4;
+
+    if (debug) printf("algorithm %s, device addr %02x\n", ctrl->name, ctrl->i2c_addr);
+
+    i2c_fd = i2c_open(dev, addr);
+    if (i2c_fd < 0)
+        return -1;
+
+    if (strcmp(file, "-") != 0) {
+        in_fd = open(file, O_RDONLY);
+        if (in_fd < 0) {
+            perror("open");
+            goto out2;
+        }
+    }
+
+    if (verbose) {
+        if (gettimeofday(&start, NULL) < 0) {
+            perror("gettimeofday");
+            goto out;
+        }
+    }
+
+    for (nblk = 0; ; ++nblk) {
+        nread = read(in_fd, block, blen);
+        if (nread != blen) {
+            if (nread < 0) {
+                /* read error */
+                perror("read");
+                goto out;
+            }
+            else if (nread == 0) {
+                /* EOF */
+                break;
+            }
+            else {
+                /* partial read - pad the block with 0 */
+                while (nread < blen) {
+                    block[nread++] = 0;
+                }
+            }
+        }
+        if (debug) {
+            printf("write [");
+            for (i = 0; i < blen; ++i)
+                printf(" %02x", block[i]);
+            printf(" ]\n");
+        }
+        if (write(i2c_fd, block, blen) != blen) {
+            perror("i2c write failed");
+            goto out;
+        }
+    }
+
+    for (i = 0; i < dlen; ++i) {
+        /* read() on the i2c device only returns one byte at a time */
+        if (read(i2c_fd, &digest[i], 1) != 1) {
+            perror("i2c read failed");
+            goto out;
+        }
+    }
+
+    if (verbose) {
+        if (gettimeofday(&stop, NULL) < 0) {
+            perror("gettimeofday");
+            goto out;
+        }
+        timersub(&stop, &start, &difftime);
+        printf("%d blocks written in %d.%03d sec (%.3f blocks/sec)\n",
+               nblk, (int)difftime.tv_sec, (int)difftime.tv_usec/1000,
+               (float)nblk / ((float)difftime.tv_sec + ((float)difftime.tv_usec)/1000000));
+    }
+
+    ret = dlen;
+out:
+    if (in_fd != 0)
+        close(in_fd);
+out2:
+    i2c_close(i2c_fd);
+    return ret;
+}
+
+/* ---------------- main ---------------- */
+
+int main(int argc, char *argv[])
+{
+    char *dev = I2C_dev;
+    int addr = 0;
+    int i, opt, quiet = 0;
+    char *algo = "sha-1";
+    char *file = "-";
+    uint8_t digest[512/8];
+    int dlen;
+
+    while ((opt = getopt(argc, argv, "h?dvqi:a:")) != -1) {
+        switch (opt) {
+        case 'h':
+        case '?':
+            printf(usage, argv[0]);
+            return 0;
+        case 'd':
+            debug = 1;
+            break;
+        case 'v':
+            verbose = 1;
+            break;
+        case 'q':
+            quiet = 1;
+            break;
+        case 'i':
+            dev = optarg;
+            break;
+        case 'a':
+            addr = (int)strtol(optarg, NULL, 0);
+            if ((addr < 0x03) || (addr > 0x77)) {
+                fprintf(stderr, "addr must be between 0x03 and 0x77\n");
+                return 1;
+            }
+            break;
+        default:
+            fprintf(stderr, usage, argv[0]);
+            return 1;
+        }
+    }
+
+    if (optind < argc) {
+        algo = argv[optind];
+        ++optind;
+    }
+    else {
+        if (!quiet)
+            printf("defaulting to algorithm \"%s\"\n", algo);
+    }
+
+    if (optind < argc) {
+        file = argv[optind];
+        ++optind;
+    }
+    else {
+        if (!quiet)
+            printf("reading from stdin\n");
+    }
+
+    dlen = hash(dev, algo, file, digest);
+    if (dlen < 0)
+        return 1;
+
+    for (i = 0; i < dlen; ++i) {
+        printf("%02x", digest[i]);
+        if (i % 16 == 15)
+            printf("\n");
+        else if (i % 4 == 3)
+            printf(" ");
+    }
+    if (dlen % 16 != 0)
+        printf("\n");
+
+    return 0;
+}
diff --git a/src/sw/hash_tester.c b/src/sw/hash_tester.c
new file mode 100644
index 0000000..994c305
--- /dev/null
+++ b/src/sw/hash_tester.c
@@ -0,0 +1,688 @@
+/* 
+ * hash_tester.c
+ * --------------
+ * This program sends several commands to the coretest_hashes subsystem
+ * in order to verify the SHA-1, SHA-256 and SHA-512/x hash function
+ * cores.
+ *
+ * Note: This version of the program talks to the FPGA over an I2C bus.
+ *
+ * The single and dual block test cases are taken from the
+ * NIST KAT document:
+ * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA_All.pdf
+ *
+ * 
+ * Authors: Joachim Strömbergson, Paul Selkirk
+ * Copyright (c) 2014, SUNET
+ * 
+ * Redistribution and use in source and binary forms, with or 
+ * without modification, are permitted provided that the following 
+ * conditions are met: 
+ * 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in 
+ *    the documentation and/or other materials provided with the 
+ *    distribution. 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <linux/i2c-dev.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <ctype.h>
+
+/* I2C configuration */
+#define I2C_DEV  "/dev/i2c-2"
+
+#define I2C_SHA1_ADDR    0x1e
+#define I2C_SHA256_ADDR  0x1f
+#define I2C_SHA512_ADDR  0x20
+
+#define MODE_SHA_512_224 0x00
+#define MODE_SHA_512_256 0x01
+#define MODE_SHA_384     0x02
+#define MODE_SHA_512     0x03
+
+int i2cfd;
+int debug = 0;
+
+#define SHA1_BLOCK_BITS         512
+#define SHA1_BLOCK_BYTES        SHA1_BLOCK_BITS/8
+#define SHA1_DIGEST_BITS        160
+#define SHA1_DIGEST_BYTES       SHA1_DIGEST_BITS/8
+
+#define SHA256_BLOCK_BITS       512
+#define SHA256_BLOCK_BYTES      SHA256_BLOCK_BITS/8
+#define SHA256_DIGEST_BITS      256
+#define SHA256_DIGEST_BYTES     SHA256_DIGEST_BITS/8
+
+#define SHA512_BLOCK_BITS       1024
+#define SHA512_BLOCK_BYTES      SHA512_BLOCK_BITS/8
+#define SHA512_224_DIGEST_BITS  224
+#define SHA512_224_DIGEST_BYTES SHA512_224_DIGEST_BITS/8
+#define SHA512_256_DIGEST_BITS  256
+#define SHA512_256_DIGEST_BYTES SHA512_256_DIGEST_BITS/8
+#define SHA384_DIGEST_BITS      384
+#define SHA384_DIGEST_BYTES     SHA384_DIGEST_BITS/8
+#define SHA512_DIGEST_BITS      512
+#define SHA512_DIGEST_BYTES     SHA512_DIGEST_BITS/8
+
+/* SHA-1/SHA-256 One Block Message Sample
+   Input Message: "abc" */
+const uint8_t NIST_512_SINGLE[] =
+{ 0x61, 0x62, 0x63, 0x80, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 };
+
+const uint8_t SHA1_SINGLE_DIGEST[] =
+{ 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a,
+  0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c,
+  0x9c, 0xd0, 0xd8, 0x9d };
+
+const uint8_t SHA256_SINGLE_DIGEST[] =
+{ 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
+  0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
+  0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
+  0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD };
+
+/* SHA-1/SHA-256 Two Block Message Sample
+   Input Message: "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" */
+const uint8_t NIST_512_DOUBLE0[] =
+{ 0x61, 0x62, 0x63, 0x64, 0x62, 0x63, 0x64, 0x65,
+  0x63, 0x64, 0x65, 0x66, 0x64, 0x65, 0x66, 0x67,
+  0x65, 0x66, 0x67, 0x68, 0x66, 0x67, 0x68, 0x69,
+  0x67, 0x68, 0x69, 0x6A, 0x68, 0x69, 0x6A, 0x6B,
+  0x69, 0x6A, 0x6B, 0x6C, 0x6A, 0x6B, 0x6C, 0x6D,
+  0x6B, 0x6C, 0x6D, 0x6E, 0x6C, 0x6D, 0x6E, 0x6F,
+  0x6D, 0x6E, 0x6F, 0x70, 0x6E, 0x6F, 0x70, 0x71,
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+const uint8_t NIST_512_DOUBLE1[] =
+{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xC0 };
+
+const uint8_t SHA1_DOUBLE_DIGEST[] =
+{ 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E,
+  0xBA, 0xAE, 0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5,
+  0xE5, 0x46, 0x70, 0xF1 };
+
+const uint8_t SHA256_DOUBLE_DIGEST[] =
+{ 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
+  0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
+  0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
+  0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 };
+
+/* SHA-512 One Block Message Sample
+   Input Message: "abc" */
+const uint8_t NIST_1024_SINGLE[] =
+{ 0x61, 0x62, 0x63, 0x80, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 };
+
+const uint8_t SHA512_224_SINGLE_DIGEST[] =
+{ 0x46, 0x34, 0x27, 0x0f, 0x70, 0x7b, 0x6a, 0x54,
+  0xda, 0xae, 0x75, 0x30, 0x46, 0x08, 0x42, 0xe2,
+  0x0e, 0x37, 0xed, 0x26, 0x5c, 0xee, 0xe9, 0xa4,
+  0x3e, 0x89, 0x24, 0xaa };
+const uint8_t SHA512_256_SINGLE_DIGEST[] =
+{ 0x53, 0x04, 0x8e, 0x26, 0x81, 0x94, 0x1e, 0xf9,
+  0x9b, 0x2e, 0x29, 0xb7, 0x6b, 0x4c, 0x7d, 0xab,
+  0xe4, 0xc2, 0xd0, 0xc6, 0x34, 0xfc, 0x6d, 0x46,
+  0xe0, 0xe2, 0xf1, 0x31, 0x07, 0xe7, 0xaf, 0x23 };
+const uint8_t SHA384_SINGLE_DIGEST[] =
+{ 0xcb, 0x00, 0x75, 0x3f, 0x45, 0xa3, 0x5e, 0x8b,
+  0xb5, 0xa0, 0x3d, 0x69, 0x9a, 0xc6, 0x50, 0x07,
+  0x27, 0x2c, 0x32, 0xab, 0x0e, 0xde, 0xd1, 0x63,
+  0x1a, 0x8b, 0x60, 0x5a, 0x43, 0xff, 0x5b, 0xed,
+  0x80, 0x86, 0x07, 0x2b, 0xa1, 0xe7, 0xcc, 0x23,
+  0x58, 0xba, 0xec, 0xa1, 0x34, 0xc8, 0x25, 0xa7 };
+const uint8_t SHA512_SINGLE_DIGEST[] =
+{ 0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba,
+  0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31,
+  0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2,
+  0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a,
+  0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8,
+  0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd,
+  0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e,
+  0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f };
+
+/* SHA-512 Two Block Message Sample
+   Input Message: "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
+   "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" */
+const uint8_t NIST_1024_DOUBLE0[] =
+{ 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+  0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+  0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
+  0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
+  0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
+  0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
+  0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
+  0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+  0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
+  0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71,
+  0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72,
+  0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73,
+  0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74,
+  0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75,
+  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+const uint8_t NIST_1024_DOUBLE1[] =
+{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80 };
+
+const uint8_t SHA512_224_DOUBLE_DIGEST[] = 
+{ 0x23, 0xfe, 0xc5, 0xbb, 0x94, 0xd6, 0x0b, 0x23,
+  0x30, 0x81, 0x92, 0x64, 0x0b, 0x0c, 0x45, 0x33,
+  0x35, 0xd6, 0x64, 0x73, 0x4f, 0xe4, 0x0e, 0x72,
+  0x68, 0x67, 0x4a, 0xf9 };
+const uint8_t SHA512_256_DOUBLE_DIGEST[] =
+{ 0x39, 0x28, 0xe1, 0x84, 0xfb, 0x86, 0x90, 0xf8,
+  0x40, 0xda, 0x39, 0x88, 0x12, 0x1d, 0x31, 0xbe,
+  0x65, 0xcb, 0x9d, 0x3e, 0xf8, 0x3e, 0xe6, 0x14,
+  0x6f, 0xea, 0xc8, 0x61, 0xe1, 0x9b, 0x56, 0x3a };
+const uint8_t SHA384_DOUBLE_DIGEST[] =
+{ 0x09, 0x33, 0x0c, 0x33, 0xf7, 0x11, 0x47, 0xe8,
+  0x3d, 0x19, 0x2f, 0xc7, 0x82, 0xcd, 0x1b, 0x47,
+  0x53, 0x11, 0x1b, 0x17, 0x3b, 0x3b, 0x05, 0xd2,
+  0x2f, 0xa0, 0x80, 0x86, 0xe3, 0xb0, 0xf7, 0x12,
+  0xfc, 0xc7, 0xc7, 0x1a, 0x55, 0x7e, 0x2d, 0xb9,
+  0x66, 0xc3, 0xe9, 0xfa, 0x91, 0x74, 0x60, 0x39 };
+const uint8_t SHA512_DOUBLE_DIGEST[] =
+{ 0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda,
+  0x8c, 0xf4, 0xf7, 0x28, 0x14, 0xfc, 0x14, 0x3f,
+  0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1,
+  0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18,
+  0x50, 0x1d, 0x28, 0x9e, 0x49, 0x00, 0xf7, 0xe4,
+  0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a,
+  0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54,
+  0x5e, 0x96, 0xe5, 0x5b, 0x87, 0x4b, 0xe9, 0x09 };
+
+/* ---------------- I2C low-level code ---------------- */
+
+int i2c_open(char *dev)
+{
+    i2cfd = open(dev, O_RDWR);
+    if (i2cfd < 0) {
+        fprintf(stderr, "Unable to open %s: ", dev);
+        perror("");
+        i2cfd = 0;
+        return 1;
+    }
+
+    return 0;
+}
+
+int i2c_addr(int addr)
+{
+    static int cur_addr = 0;
+
+    if (addr != cur_addr) {
+        if (ioctl(i2cfd, I2C_SLAVE, addr) < 0) {
+            fprintf(stderr, "Unable to set I2C slave device 0x%02x: ", addr);
+            perror("");
+            return 1;
+        }
+        addr = cur_addr;
+    }
+
+    return 0;
+}
+
+int i2c_close(void)
+{
+    return close(i2cfd);
+}
+
+int i2c_write(const uint8_t *buf, int len)
+{
+    if (write(i2cfd, buf, len) != len) {
+        perror("i2c write failed");
+        return 1;
+    }
+
+    return 0;
+}
+
+int i2c_read(uint8_t *b)
+{
+    /* read() on the i2c device only returns one byte at a time,
+     * and tc_get_resp() needs to parse the response one byte at a time
+     */
+    if (read(i2cfd, b, 1) != 1) {
+        perror("i2c read failed");
+        return 1;
+    }
+
+    return 0;
+}
+
+/* ---------------- test-case low-level code ---------------- */
+
+int tc_write(int addr, const uint8_t *buf, int len)
+{
+    /* we only set the i2c device addr on tc_write, because test cases always
+     * write before reading, plus test cases never call tc_read directly
+     */
+    if (i2c_addr(addr) != 0)
+        return 1;
+
+    if (debug) {
+        int i;
+        printf("write [");
+        for (i = 0; i < len; ++i)
+            printf(" %02x", buf[i]);
+        printf(" ]\n");
+    }
+
+    return i2c_write(buf, len);
+}
+
+int tc_read(uint8_t *buf, int len)
+{
+    int i;
+
+    if (debug) printf("read  [");
+
+    for (i = 0; i < len; ++i) {
+        if (i2c_read(&buf[i]) != 0) {
+            if (debug) printf(" ]\n");
+            return 1;
+        }
+        if (debug) printf(" %02x", buf[i]);
+    }
+
+    if (debug) printf(" ]\n");
+
+    return 0;
+}
+
+int tc_expected(const uint8_t *expected, int len)
+{
+    uint8_t *buf;
+    int i;
+
+    buf = malloc(len);
+    if (buf == NULL) {
+        perror("malloc");
+        return 1;
+    }
+
+    if (tc_read(buf, len) != 0)
+        goto errout;
+
+    for (i = 0; i < len; ++i)
+        if (buf[i] != expected[i]) {
+            fprintf(stderr, "response byte %d: expected 0x%02x, got 0x%02x\n",
+                    i, expected[i], buf[i]);
+            goto errout;
+        }
+
+    free(buf);
+    return 0;
+errout:
+    free(buf);
+    return 1;
+}
+
+/* ---------------- SHA-1 test cases ---------------- */
+
+#define BLOCK_LEN  SHA1_BLOCK_BYTES
+#define DIGEST_LEN SHA1_DIGEST_BYTES
+
+/* TC1: Read name and version from SHA-1 core. */
+int TC1(int addr)
+{
+    return 0;
+}
+
+/* TC2: SHA-1 Single block message test as specified by NIST. */
+int TC2(int addr)
+{
+    const uint8_t *block = NIST_512_SINGLE;
+    const uint8_t *expected = SHA1_SINGLE_DIGEST;
+
+    printf("TC2: Single block message test for SHA-1.\n");
+
+    if (addr == 0)
+        addr = I2C_SHA1_ADDR;
+
+    return
+        tc_write(addr, block, BLOCK_LEN) ||
+        tc_expected(expected, DIGEST_LEN);
+}
+
+/* TC3: SHA-1 Double block message test as specified by NIST. */
+int TC3(int addr)
+{
+    const uint8_t *block[2] = { NIST_512_DOUBLE0, NIST_512_DOUBLE1 };
+    const uint8_t *expected = SHA1_DOUBLE_DIGEST;
+
+    printf("TC3: Double block message test for SHA-1.\n");
+
+    if (addr == 0)
+        addr = I2C_SHA1_ADDR;
+
+    return
+        tc_write(addr, block[0], BLOCK_LEN) ||
+        tc_write(addr, block[1], BLOCK_LEN) ||
+        tc_expected(expected, DIGEST_LEN);
+}
+
+/* ---------------- SHA-256 test cases ---------------- */
+
+#undef  BLOCK_LEN
+#define BLOCK_LEN  SHA256_BLOCK_BYTES
+#undef  DIGEST_LEN
+#define DIGEST_LEN SHA256_DIGEST_BYTES
+
+int TC4(int addr)
+{
+    return 0;
+}
+
+/* TC5: SHA-256 Single block message test as specified by NIST. */
+int TC5(int addr)
+{
+    const uint8_t *block = NIST_512_SINGLE;
+    const uint8_t *expected = SHA256_SINGLE_DIGEST;
+
+    printf("TC5: Single block message test for SHA-256.\n");
+
+    if (addr == 0)
+        addr = I2C_SHA256_ADDR;
+
+    return
+        tc_write(addr, block, BLOCK_LEN) ||
+        tc_expected(expected, DIGEST_LEN);
+}
+
+/* TC6: SHA-256 Double block message test as specified by NIST. */
+int TC6(int addr)
+{
+    const uint8_t *block[2] = { NIST_512_DOUBLE0, NIST_512_DOUBLE1 };
+    const uint8_t *expected = SHA256_DOUBLE_DIGEST;
+
+    printf("TC6: Double block message test for SHA-256.\n");
+
+    if (addr == 0)
+        addr = I2C_SHA256_ADDR;
+
+    return
+        tc_write(addr, block[0], BLOCK_LEN) ||
+        tc_write(addr, block[1], BLOCK_LEN) ||
+        tc_expected(expected, DIGEST_LEN);
+}
+
+/* TC7: SHA-256 Huge message test. */
+int TC7(int addr)
+{
+    static const uint8_t block[] =
+        { 0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
+          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
+          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
+          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
+          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
+          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
+          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
+          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f };
+
+    /* final digest after 1000 iterations */
+    static const uint8_t expected[] = 
+        { 0x76, 0x38, 0xf3, 0xbc, 0x50, 0x0d, 0xd1, 0xa6,
+          0x58, 0x6d, 0xd4, 0xd0, 0x1a, 0x15, 0x51, 0xaf,
+          0xd8, 0x21, 0xd2, 0x35, 0x2f, 0x91, 0x9e, 0x28,
+          0xd5, 0x84, 0x2f, 0xab, 0x03, 0xa4, 0x0f, 0x2a };
+
+    int i, n = 1000;
+
+    printf("TC7: Message with %d blocks test for SHA-256.\n", n);
+
+    if (addr == 0)
+        addr = I2C_SHA256_ADDR;
+
+    /* Write blocks to SHA-256. */
+    for (i = 0; i < n; ++i)
+        if (tc_write(addr, block, BLOCK_LEN) != 0)
+            return 1;
+
+    /* Extract the final digest. */
+    return tc_expected(expected, DIGEST_LEN);
+}
+
+/* ---------------- SHA-512 test cases ---------------- */
+
+#undef  BLOCK_LEN
+#define BLOCK_LEN  SHA512_BLOCK_BYTES
+
+/* TC8: Read name and version from SHA-512 core. */
+int TC8(int addr)
+{
+    return 0;
+}
+
+/* TC9: SHA-512 Single block message test as specified by NIST.
+   We do this for all modes. */
+int tc9(int addr, const uint8_t *expected, int digest_len)
+{
+    const uint8_t *block = NIST_1024_SINGLE;
+
+    return
+        tc_write(addr, block, BLOCK_LEN) ||
+        tc_expected(expected, digest_len);
+}
+
+int TC9(int addr)
+{
+    if (addr == 0)
+        addr = I2C_SHA512_ADDR;
+
+    printf("TC9-1: Single block message test for SHA-512/224.\n");
+    if (tc9(addr + MODE_SHA_512_224, SHA512_224_SINGLE_DIGEST,
+            sizeof(SHA512_224_SINGLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC9-2: Single block message test for SHA-512/256.\n");
+    if (tc9(addr + MODE_SHA_512_256, SHA512_256_SINGLE_DIGEST,
+            sizeof(SHA512_256_SINGLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC9-3: Single block message test for SHA-384.\n");
+    if (tc9(addr + MODE_SHA_384, SHA384_SINGLE_DIGEST,
+            sizeof(SHA384_SINGLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC9-4: Single block message test for SHA-512.\n");
+    if (tc9(addr + MODE_SHA_512, SHA512_SINGLE_DIGEST,
+            sizeof(SHA512_SINGLE_DIGEST)) != 0)
+        return 1;
+
+    return 0;
+}
+
+/* TC10: SHA-512 Double block message test as specified by NIST.
+   We do this for all modes. */
+int tc10(int addr, const uint8_t *expected, int digest_len)
+{
+    const uint8_t *block[2] = { NIST_1024_DOUBLE0, NIST_1024_DOUBLE1 };
+
+    return
+        tc_write(addr, block[0], BLOCK_LEN) ||
+        tc_write(addr, block[1], BLOCK_LEN) ||
+        tc_expected(expected, digest_len);
+}
+
+int TC10(int addr)
+{
+    if (addr == 0)
+        addr = I2C_SHA512_ADDR;
+
+    printf("TC10-1: Double block message test for SHA-512/224.\n");
+    if (tc10(addr + MODE_SHA_512_224, SHA512_224_DOUBLE_DIGEST,
+             sizeof(SHA512_224_DOUBLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC10-2: Double block message test for SHA-512/256.\n");
+    if (tc10(addr + MODE_SHA_512_256, SHA512_256_DOUBLE_DIGEST,
+             sizeof(SHA512_256_DOUBLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC10-3: Double block message test for SHA-384.\n");
+    if (tc10(addr + MODE_SHA_384, SHA384_DOUBLE_DIGEST,
+             sizeof(SHA384_DOUBLE_DIGEST)) != 0)
+        return 1;
+
+    printf("TC10-4: Double block message test for SHA-512.\n");
+    if (tc10(addr + MODE_SHA_512, SHA512_DOUBLE_DIGEST,
+             sizeof(SHA512_DOUBLE_DIGEST)) != 0)
+        return 1;
+
+    return 0;
+}
+
+/* ---------------- main ---------------- */
+
+int main(int argc, char *argv[])
+{
+    typedef int (*tcfp)(int);
+    tcfp all_tests[] = { TC1, TC2, TC3, TC4, TC5, TC6, TC7, TC9, TC10
+    };
+    tcfp sha1_tests[] = { TC1, TC2, TC3 };
+    tcfp sha256_tests[] = { TC4, TC5, TC6, TC7 };
+    tcfp sha512_tests[] = { TC9, TC10 };
+
+    char *usage = "Usage: %s [-h] [-d] [-i I2C_device] [-a I2C_addr] tc...\n";
+    char *dev = I2C_DEV;
+    int addr = 0;
+    int i, j, opt;
+
+    while ((opt = getopt(argc, argv, "h?di:a:")) != -1) {
+        switch (opt) {
+        case 'h':
+        case '?':
+            printf(usage, argv[0]);
+            return 0;
+        case 'd':
+            debug = 1;
+            break;
+        case 'i':
+            dev = optarg;
+            break;
+        case 'a':
+            addr = (int)strtol(optarg, NULL, 0);
+            if ((addr < 0x03) || (addr > 0x77)) {
+                fprintf(stderr, "addr must be between 0x03 and 0x77\n");
+                return 1;
+            }
+            break;
+        default:
+            fprintf(stderr, usage, argv[0]);
+            return 1;
+        }
+    }
+
+    if (i2c_open(dev) != 0)
+        return 1;
+
+    /* no args == run all tests */
+    if (optind >= argc) {
+        for (j = 0; j < sizeof(all_tests)/sizeof(all_tests[0]); ++j)
+            if (all_tests[j](addr) != 0)
+                return 1;
+        return 0;
+    }
+
+    for (i = optind; i < argc; ++i) {
+        if (strcmp(argv[i], "sha1") == 0) {
+            for (j = 0; j < sizeof(sha1_tests)/sizeof(sha1_tests[0]); ++j)
+                if (sha1_tests[j](addr) != 0)
+                    return 1;
+        }
+        else if (strcmp(argv[i], "sha256") == 0) {
+            for (j = 0; j < sizeof(sha256_tests)/sizeof(sha256_tests[0]); ++j)
+                if (sha256_tests[j](addr) != 0)
+                    return 1;
+        }
+        else if (strcmp(argv[i], "sha512") == 0) {
+            for (j = 0; j < sizeof(sha512_tests)/sizeof(sha512_tests[0]); ++j)
+                if (sha512_tests[j](addr) != 0)
+                    return 1;
+        }
+        else if (strcmp(argv[i], "all") == 0) {
+            for (j = 0; j < sizeof(all_tests)/sizeof(all_tests[0]); ++j)
+                if (all_tests[j](addr) != 0)
+                    return 1;
+        }
+        else if (isdigit(argv[i][0]) &&
+                 (((j = atoi(argv[i])) > 0) &&
+                  (j <= sizeof(all_tests)/sizeof(all_tests[0])))) {
+            if (all_tests[j - 1](addr) != 0)
+                return 1;
+        }
+        else {
+            fprintf(stderr, "unknown test case %s\n", argv[i]);
+            return 1;
+        }
+    }
+
+    return 0;
+}