diff --git a/MasterPassword/C/build b/MasterPassword/C/build
index 632dc318..fe914e5d 100755
--- a/MasterPassword/C/build
+++ b/MasterPassword/C/build
@@ -13,10 +13,15 @@
 cd "${BASH_SOURCE%/*}"
 set -e
 
+# optional features.
 options=(
-    # optional features.
     -DDEBUG                     # Turn on debugging verbosity.
 )
+# available targets.
+targets=(
+    mpw                         # C CLI version of Master Password.
+    mpw-bench                   # C CLI Master Password benchmark utility.
+)
 
 
 ### DEPENDENCIES
@@ -67,8 +72,67 @@ if ! [[ -e lib/scrypt/scrypt-scryptenc.o ]]; then
     popd
 fi
 
-echo
-echo "Building mpw..."
+
+### MPW
+mpw() {
+    CFLAGS=(
+        # include paths
+        -I"lib/scrypt/lib" -I"lib/scrypt/libcperciva"
+    )
+    LDFLAGS=(
+        # library paths
+        -L"." -L"lib/scrypt"
+        # link libraries
+        -l"crypto"
+        # scrypt
+        "lib/scrypt/scrypt-crypto_aesctr.o"
+        "lib/scrypt/scrypt-sha256.o"
+        "lib/scrypt/scrypt-crypto_scrypt-nosse.o"
+        "lib/scrypt/scrypt-memlimit.o"
+        "lib/scrypt/scrypt-scryptenc_cpuperf.o"
+        "lib/scrypt/scrypt-scryptenc.o"
+    )
+
+    cc "${CFLAGS[@]}"                 "${options[@]}" -c types.c -o types.o "$@"
+    cc "${CFLAGS[@]}" "${LDFLAGS[@]}" "${options[@]}" "types.o" mpw.c -o mpw "$@"
+    echo "done!  Now run ./install or use ./mpw"
+}
+
+
+### MPW-BENCH
+mpw-bench() {
+    CFLAGS=(
+        # include paths
+        -I"lib/scrypt/lib" -I"lib/scrypt/libcperciva"
+        -I"lib/bcrypt" 
+    )
+    LDFLAGS=(
+        # library paths
+        -L"." -L"lib/scrypt"
+        -L"lib/bcrypt"
+        # libraries
+        -l"crypto"
+        # scrypt
+        "lib/scrypt/scrypt-crypto_aesctr.o"
+        "lib/scrypt/scrypt-sha256.o"
+        "lib/scrypt/scrypt-crypto_scrypt-nosse.o"
+        "lib/scrypt/scrypt-memlimit.o"
+        "lib/scrypt/scrypt-scryptenc_cpuperf.o"
+        "lib/scrypt/scrypt-scryptenc.o"
+        # bcrypt
+        "lib/bcrypt/crypt_blowfish.o"
+        "lib/bcrypt/crypt_gensalt.o"
+        "lib/bcrypt/wrapper.o"
+        "lib/bcrypt/x86.o"
+    )
+
+    cc "${CFLAGS[@]}"                 "${options[@]}" -c types.c -o types.o "$@"
+    cc "${CFLAGS[@]}" "${LDFLAGS[@]}" "${options[@]}" "types.o" mpw-bench.c -o mpw-bench "$@"
+    echo "done!  Now use ./mpw-bench"
+}
+
+
+### TARGETS
 
 cc() {
     if hash llvm-gcc 2>/dev/null; then
@@ -78,26 +142,8 @@ cc() {
     fi
 }
 
-
-### MPW
-
-CFLAGS=(
-    # include paths.
-    -I"lib/scrypt/lib" -I"lib/scrypt/libcperciva"
-)
-LDFLAGS=(
-    # library paths.
-    -L"." -L"lib/scrypt"
-    # link libraries.
-    "lib/scrypt/scrypt-crypto_aesctr.o"
-    "lib/scrypt/scrypt-sha256.o"
-    "lib/scrypt/scrypt-crypto_scrypt-nosse.o"
-    "lib/scrypt/scrypt-memlimit.o"
-    "lib/scrypt/scrypt-scryptenc_cpuperf.o"
-    "lib/scrypt/scrypt-scryptenc.o"
-    -l"crypto"
-)
-
-cc "${CFLAGS[@]}"                 "${options[@]}" -c types.c -o types.o "$@"
-cc "${CFLAGS[@]}" "${LDFLAGS[@]}" "${options[@]}" "types.o" mpw.c -o mpw "$@"
-echo "done!  Now run ./install or use ./mpw"
+for target in "${targets[@]}"; do
+    echo
+    echo "Building target: $target..."
+    "$target" "$@"
+done
diff --git a/MasterPassword/C/mpw-bench.c b/MasterPassword/C/mpw-bench.c
new file mode 100644
index 00000000..112f3b7f
--- /dev/null
+++ b/MasterPassword/C/mpw-bench.c
@@ -0,0 +1,170 @@
+#include <sys/time.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <math.h>
+#include <pwd.h>
+#include <netinet/in.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <alg/sha256.h>
+#include <crypto/crypto_scrypt.h>
+#include <ow-crypt.h>
+#include "types.h"
+
+#define MP_N                32768
+#define MP_r                8
+#define MP_p                2
+#define MP_dkLen            64
+#define MP_hash             PearlHashSHA256
+
+
+int main(int argc, char *const argv[]) {
+
+    char *userName = "Robert Lee Mitchel";
+    char *masterPassword = "banana colored duckling";
+    char *siteName = "masterpasswordapp.com";
+    uint32_t siteCounter = 1;
+    MPElementType siteType = MPElementTypeGeneratedLong;
+
+    // Start MP
+    struct timeval startTime;
+    if (gettimeofday(&startTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+
+    int iterations = 100;
+    for (int i = 0; i < iterations; ++i) {
+        // Calculate the master key salt.
+        char *mpNameSpace = "com.lyndir.masterpassword";
+        const uint32_t n_userNameLength = htonl(strlen(userName));
+        const size_t masterKeySaltLength = strlen(mpNameSpace) + sizeof(n_userNameLength) + strlen(userName);
+        char *masterKeySalt = malloc( masterKeySaltLength );
+        if (!masterKeySalt) {
+            fprintf(stderr, "Could not allocate master key salt: %d\n", errno);
+            return 1;
+        }
+
+        char *mKS = masterKeySalt;
+        memcpy(mKS, mpNameSpace, strlen(mpNameSpace)); mKS += strlen(mpNameSpace);
+        memcpy(mKS, &n_userNameLength, sizeof(n_userNameLength)); mKS += sizeof(n_userNameLength);
+        memcpy(mKS, userName, strlen(userName)); mKS += strlen(userName);
+        if (mKS - masterKeySalt != masterKeySaltLength)
+            abort();
+        trc("masterKeySalt ID: %s\n", IDForBuf(masterKeySalt, masterKeySaltLength));
+
+        // Calculate the master key.
+        uint8_t *masterKey = malloc( MP_dkLen );
+        if (!masterKey) {
+            fprintf(stderr, "Could not allocate master key: %d\n", errno);
+            return 1;
+        }
+        if (crypto_scrypt( (const uint8_t *)masterPassword, strlen(masterPassword), (const uint8_t *)masterKeySalt, masterKeySaltLength, MP_N, MP_r, MP_p, masterKey, MP_dkLen ) < 0) {
+            fprintf(stderr, "Could not generate master key: %d\n", errno);
+            return 1;
+        }
+        memset(masterKeySalt, 0, masterKeySaltLength);
+        free(masterKeySalt);
+
+        // Calculate the site seed.
+        const uint32_t n_siteNameLength = htonl(strlen(siteName));
+        const uint32_t n_siteCounter = htonl(siteCounter);
+        const size_t sitePasswordInfoLength = strlen(mpNameSpace) + sizeof(n_siteNameLength) + strlen(siteName) + sizeof(n_siteCounter);
+        char *sitePasswordInfo = malloc( sitePasswordInfoLength );
+        if (!sitePasswordInfo) {
+            fprintf(stderr, "Could not allocate site seed: %d\n", errno);
+            return 1;
+        }
+
+        char *sPI = sitePasswordInfo;
+        memcpy(sPI, mpNameSpace, strlen(mpNameSpace)); sPI += strlen(mpNameSpace);
+        memcpy(sPI, &n_siteNameLength, sizeof(n_siteNameLength)); sPI += sizeof(n_siteNameLength);
+        memcpy(sPI, siteName, strlen(siteName)); sPI += strlen(siteName);
+        memcpy(sPI, &n_siteCounter, sizeof(n_siteCounter)); sPI += sizeof(n_siteCounter);
+        if (sPI - sitePasswordInfo != sitePasswordInfoLength)
+            abort();
+
+        uint8_t sitePasswordSeed[32];
+        HMAC_SHA256_Buf(masterKey, MP_dkLen, sitePasswordInfo, sitePasswordInfoLength, sitePasswordSeed);
+        memset(masterKey, 0, MP_dkLen);
+        memset(sitePasswordInfo, 0, sitePasswordInfoLength);
+        free(masterKey);
+        free(sitePasswordInfo);
+
+        // Determine the cipher.
+        const char *cipher = CipherForType(siteType, sitePasswordSeed[0]);
+        trc("type %d, cipher: %s\n", siteType, cipher);
+        if (strlen(cipher) > 32)
+            abort();
+
+        // Encode the password from the seed using the cipher.
+        char *sitePassword = calloc(strlen(cipher) + 1, sizeof(char));
+        for (int c = 0; c < strlen(cipher); ++c) {
+            sitePassword[c] = CharacterFromClass(cipher[c], sitePasswordSeed[c + 1]);
+            trc("class %c, character: %c\n", cipher[c], sitePassword[c]);
+        }
+        memset(sitePasswordSeed, 0, sizeof(sitePasswordSeed));
+
+        fprintf( stderr, "\riteration %d / %d..", i, iterations );
+    }
+
+    // Output timing results.
+    struct timeval endTime;
+    if (gettimeofday(&endTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+    long long secs = (endTime.tv_sec - startTime.tv_sec);
+    long long usecs = (endTime.tv_usec - startTime.tv_usec);
+    double elapsed = secs + usecs / 1000000.0;
+    fprintf( stdout, "Master Password: %d iterations in %llds %lldµs -> %.2f/s\n", iterations, secs, usecs, iterations / elapsed );
+
+    // Start SHA-256
+    if (gettimeofday(&startTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+
+    iterations = 50000000;
+    uint8_t hash[32];
+    for (int i = 0; i < iterations; ++i)
+        SHA256_Buf(masterPassword, strlen(masterPassword), hash);
+
+    // Output timing results.
+    if (gettimeofday(&endTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+    secs = (endTime.tv_sec - startTime.tv_sec);
+    usecs = (endTime.tv_usec - startTime.tv_usec);
+    elapsed = secs + usecs / 1000000.0;
+    fprintf( stdout, "SHA-256: %d iterations in %llds %lldµs -> %.2f/s\n", iterations, secs, usecs, iterations / elapsed );
+
+    // Start BCrypt
+    if (gettimeofday(&startTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+
+    int bcrypt_cost = 9;
+    iterations = 600;
+    for (int i = 0; i < iterations; ++i)
+        crypt(masterPassword, crypt_gensalt("$2b$", bcrypt_cost, userName, strlen(userName)));
+
+    // Output timing results.
+    if (gettimeofday(&endTime, NULL) != 0) {
+        fprintf(stderr, "Could not get time: %d\n", errno);
+        return 1;
+    }
+    secs = (endTime.tv_sec - startTime.tv_sec);
+    usecs = (endTime.tv_usec - startTime.tv_usec);
+    elapsed = secs + usecs / 1000000.0;
+    fprintf( stdout, "BCrypt (cost %d): %d iterations in %llds %lldµs -> %.2f/s\n", bcrypt_cost, iterations, secs, usecs, iterations / elapsed );
+
+    return 0;
+}