diff --git a/t/t_hmac_sha1.c b/t/t_hmac_sha1.c
index dae8c97..154a3ad 100644
--- a/t/t_hmac_sha1.c
+++ b/t/t_hmac_sha1.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/t/t_hmac_sha224.c b/t/t_hmac_sha224.c
index 7a9d13f..e1c1e07 100644
--- a/t/t_hmac_sha224.c
+++ b/t/t_hmac_sha224.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/t/t_hmac_sha256.c b/t/t_hmac_sha256.c
index 26d7ef7..c26ed60 100644
--- a/t/t_hmac_sha256.c
+++ b/t/t_hmac_sha256.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/t/t_hmac_sha384.c b/t/t_hmac_sha384.c
index a86e798..804105f 100644
--- a/t/t_hmac_sha384.c
+++ b/t/t_hmac_sha384.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/t/t_hmac_sha512.c b/t/t_hmac_sha512.c
index 421b16a..159d770 100644
--- a/t/t_hmac_sha512.c
+++ b/t/t_hmac_sha512.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/t/t_md2.c b/t/t_md2.c
index 1c8b3dd..f1f5d9b 100644
--- a/t/t_md2.c
+++ b/t/t_md2.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -174,23 +173,17 @@ t_md2_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[MD2_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_md2_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_md4.c b/t/t_md4.c
index f6a4e47..c58776c 100644
--- a/t/t_md4.c
+++ b/t/t_md4.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -190,23 +189,17 @@ t_md4_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[MD4_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_md4_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_md5.c b/t/t_md5.c
index e6b3520..1c7462d 100644
--- a/t/t_md5.c
+++ b/t/t_md5.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -190,23 +189,17 @@ t_md5_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[MD5_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_md5_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_sha1.c b/t/t_sha1.c
index 9b47f54..dfaad88 100644
--- a/t/t_sha1.c
+++ b/t/t_sha1.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -137,17 +136,14 @@ t_sha1_vector(char **desc CRYB_UNUSED, void *arg)
 {
 	struct t_vector *vector = (struct t_vector *)arg;
 	uint8_t digest[SHA1_DIGEST_LEN];
-	char *msg;
+	char msg[1000000];
 
 	if (vector->msg) {
 		t_sha1_complete(vector->msg, strlen(vector->msg), digest);
 	} else {
 		/* special case for FIPS test vector 3 */
-		if ((msg = malloc(1000000)) == NULL)
-			err(1, "malloc()");
 		memset(msg, 'a', 1000000);
 		t_sha1_complete(msg, 1000000, digest);
-		free(msg);
 	}
 	return (t_compare_mem(vector->digest, digest, SHA1_DIGEST_LEN));
 }
@@ -186,23 +182,17 @@ t_sha1_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[SHA1_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_sha1_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_sha224.c b/t/t_sha224.c
index c496624..746d050 100644
--- a/t/t_sha224.c
+++ b/t/t_sha224.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -146,17 +145,14 @@ t_sha224_vector(char **desc CRYB_UNUSED, void *arg)
 {
 	struct t_vector *vector = (struct t_vector *)arg;
 	uint8_t digest[SHA224_DIGEST_LEN];
-	char *msg;
+	char msg[1000000];
 
 	if (vector->msg) {
 		t_sha224_complete(vector->msg, strlen(vector->msg), digest);
 	} else {
 		/* special case for FIPS test vector 3 */
-		if ((msg = malloc(1000000)) == NULL)
-			err(1, "malloc()");
 		memset(msg, 'a', 1000000);
 		t_sha224_complete(msg, 1000000, digest);
-		free(msg);
 	}
 	return (t_compare_mem(vector->digest, digest, SHA224_DIGEST_LEN));
 }
@@ -195,23 +191,17 @@ t_sha224_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[SHA224_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_sha224_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_sha256.c b/t/t_sha256.c
index 69c85c2..92b0995 100644
--- a/t/t_sha256.c
+++ b/t/t_sha256.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -142,17 +141,14 @@ t_sha256_vector(char **desc CRYB_UNUSED, void *arg)
 {
 	struct t_vector *vector = (struct t_vector *)arg;
 	uint8_t digest[SHA256_DIGEST_LEN];
-	char *msg;
+	char msg[1000000];
 
 	if (vector->msg) {
 		t_sha256_complete(vector->msg, strlen(vector->msg), digest);
 	} else {
 		/* special case for FIPS test vector 3 */
-		if ((msg = malloc(1000000)) == NULL)
-			err(1, "malloc()");
 		memset(msg, 'a', 1000000);
 		t_sha256_complete(msg, 1000000, digest);
-		free(msg);
 	}
 	return (t_compare_mem(vector->digest, digest, SHA256_DIGEST_LEN));
 }
@@ -191,23 +187,17 @@ t_sha256_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[SHA256_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_sha256_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_sha384.c b/t/t_sha384.c
index f3842e3..146c33e 100644
--- a/t/t_sha384.c
+++ b/t/t_sha384.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -157,17 +156,14 @@ t_sha384_vector(char **desc CRYB_UNUSED, void *arg)
 {
 	struct t_vector *vector = (struct t_vector *)arg;
 	uint8_t digest[SHA384_DIGEST_LEN];
-	char *msg;
+	char msg[1000000];
 
 	if (vector->msg) {
 		t_sha384_complete(vector->msg, strlen(vector->msg), digest);
 	} else {
 		/* special case for FIPS test vector 3 */
-		if ((msg = malloc(1000000)) == NULL)
-			err(1, "malloc()");
 		memset(msg, 'a', 1000000);
 		t_sha384_complete(msg, 1000000, digest);
-		free(msg);
 	}
 	return (t_compare_mem(vector->digest, digest, SHA384_DIGEST_LEN));
 }
@@ -207,23 +203,17 @@ t_sha384_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[SHA384_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_sha384_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_sha512.c b/t/t_sha512.c
index 70cf02d..26d63a2 100644
--- a/t/t_sha512.c
+++ b/t/t_sha512.c
@@ -30,7 +30,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -167,17 +166,14 @@ t_sha512_vector(char **desc CRYB_UNUSED, void *arg)
 {
 	struct t_vector *vector = (struct t_vector *)arg;
 	uint8_t digest[SHA512_DIGEST_LEN];
-	char *msg;
+	char msg[1000000];
 
 	if (vector->msg) {
 		t_sha512_complete(vector->msg, strlen(vector->msg), digest);
 	} else {
 		/* special case for FIPS test vector 3 */
-		if ((msg = malloc(1000000)) == NULL)
-			err(1, "malloc()");
 		memset(msg, 'a', 1000000);
 		t_sha512_complete(msg, 1000000, digest);
-		free(msg);
 	}
 	return (t_compare_mem(vector->digest, digest, SHA512_DIGEST_LEN));
 }
@@ -217,23 +213,17 @@ t_sha512_perf(char **desc, void *arg)
 	struct timespec ts, te;
 	unsigned long ns;
 	uint8_t digest[SHA512_DIGEST_LEN];
-	char *msg, *comment;
 	size_t msglen = *(size_t *)arg;
+	char msg[msglen];
 
-	if ((msg = calloc(1, msglen)) == NULL)
-		err(1, "calloc()");
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	for (int i = 0; i < T_PERF_ITERATIONS; ++i)
 		t_sha512_complete(msg, msglen, digest);
 	clock_gettime(CLOCK_MONOTONIC, &te);
-	free(msg);
 	ns = te.tv_sec * 1000000000LU + te.tv_nsec;
 	ns -= ts.tv_sec * 1000000000LU + ts.tv_nsec;
-	asprintf(&comment, "%zu bytes: %d iterations in %'lu ns",
+	asprintf(desc, "%zu bytes: %d iterations in %'lu ns",
 	    msglen, T_PERF_ITERATIONS, ns);
-	if (comment == NULL)
-		err(1, "asprintf()");
-	*desc = comment;
 	return (1);
 }
 
diff --git a/t/t_util.c b/t/t_util.c
index 8c82774..264b781 100644
--- a/t/t_util.c
+++ b/t/t_util.c
@@ -29,7 +29,6 @@
 
 #include "cryb/impl.h"
 
-#include <err.h>
 #include <inttypes.h>
 #include <stdarg.h>
 #include <stdint.h>