diff --git a/library/ctr_drbg.c b/library/ctr_drbg.c
index de4a6e814..24adff08f 100644
--- a/library/ctr_drbg.c
+++ b/library/ctr_drbg.c
@@ -448,7 +448,7 @@ int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path )
 
 #if defined(POLARSSL_SELF_TEST)
 
-static unsigned char entropy_source_pr[96] =
+static const unsigned char entropy_source_pr[96] =
     { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
       0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
       0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
@@ -462,7 +462,7 @@ static unsigned char entropy_source_pr[96] =
       0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
       0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
 
-static unsigned char entropy_source_nopr[64] =
+static const unsigned char entropy_source_nopr[64] =
     { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
       0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
       0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
@@ -521,7 +521,7 @@ int ctr_drbg_self_test( int verbose )
 
     test_offset = 0;
     CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
-                                entropy_source_pr, nonce_pers_pr, 16, 32 ) );
+                                (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) );
     ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
     CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
     CHK( ctr_drbg_random( &ctx, buf, CTR_DRBG_BLOCKSIZE ) );
@@ -538,7 +538,7 @@ int ctr_drbg_self_test( int verbose )
 
     test_offset = 0;
     CHK( ctr_drbg_init_entropy_len( &ctx, ctr_drbg_self_test_entropy,
-                            entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
+                            (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
     CHK( ctr_drbg_random( &ctx, buf, 16 ) );
     CHK( ctr_drbg_reseed( &ctx, NULL, 0 ) );
     CHK( ctr_drbg_random( &ctx, buf, 16 ) );
diff --git a/library/gcm.c b/library/gcm.c
index 4e2735c0d..f4f735b6f 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -508,10 +508,10 @@ void gcm_free( gcm_context *ctx )
  */
 #define MAX_TESTS   6
 
-static int key_index[MAX_TESTS] =
+static const int key_index[MAX_TESTS] =
     { 0, 0, 1, 1, 1, 1 };
 
-static unsigned char key[MAX_TESTS][32] =
+static const unsigned char key[MAX_TESTS][32] =
 {
     { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -523,13 +523,13 @@ static unsigned char key[MAX_TESTS][32] =
       0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08 },
 };
 
-static size_t iv_len[MAX_TESTS] =
+static const size_t iv_len[MAX_TESTS] =
     { 12, 12, 12, 12, 8, 60 };
 
-static int iv_index[MAX_TESTS] =
+static const int iv_index[MAX_TESTS] =
     { 0, 0, 1, 1, 1, 2 };
 
-static unsigned char iv[MAX_TESTS][64] =
+static const unsigned char iv[MAX_TESTS][64] =
 {
     { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00 },
@@ -545,13 +545,13 @@ static unsigned char iv[MAX_TESTS][64] =
       0xa6, 0x37, 0xb3, 0x9b },
 };
 
-static size_t add_len[MAX_TESTS] =
+static const size_t add_len[MAX_TESTS] =
     { 0, 0, 0, 20, 20, 20 };
 
-static int add_index[MAX_TESTS] =
+static const int add_index[MAX_TESTS] =
     { 0, 0, 0, 1, 1, 1 };
 
-static unsigned char additional[MAX_TESTS][64] =
+static const unsigned char additional[MAX_TESTS][64] =
 {
     { 0x00 },
     { 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
@@ -559,13 +559,13 @@ static unsigned char additional[MAX_TESTS][64] =
       0xab, 0xad, 0xda, 0xd2 },
 };
 
-static size_t pt_len[MAX_TESTS] =
+static const size_t pt_len[MAX_TESTS] =
     { 0, 16, 64, 60, 60, 60 };
 
-static int pt_index[MAX_TESTS] =
+static const int pt_index[MAX_TESTS] =
     { 0, 0, 1, 1, 1, 1 };
 
-static unsigned char pt[MAX_TESTS][64] =
+static const unsigned char pt[MAX_TESTS][64] =
 {
     { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
@@ -579,7 +579,7 @@ static unsigned char pt[MAX_TESTS][64] =
       0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55 },
 };
 
-static unsigned char ct[MAX_TESTS * 3][64] =
+static const unsigned char ct[MAX_TESTS * 3][64] =
 {
     { 0x00 },
     { 0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92,
@@ -688,7 +688,7 @@ static unsigned char ct[MAX_TESTS * 3][64] =
       0x44, 0xae, 0x7e, 0x3f },
 };
 
-static unsigned char tag[MAX_TESTS * 3][16] =
+static const unsigned char tag[MAX_TESTS * 3][16] =
 {
     { 0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61,
       0x36, 0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a },
@@ -939,8 +939,6 @@ int gcm_self_test( int verbose )
     return( 0 );
 }
 
-
-
 #endif /* POLARSSL_SELF_TEST && POLARSSL_AES_C */
 
 #endif /* POLARSSL_GCM_C */
diff --git a/library/hmac_drbg.c b/library/hmac_drbg.c
index f4cac28ae..fed297f29 100644
--- a/library/hmac_drbg.c
+++ b/library/hmac_drbg.c
@@ -396,7 +396,7 @@ int hmac_drbg_self_test( int verbose )
 #define OUTPUT_LEN  80
 
 /* From a NIST PR=true test vector */
-static unsigned char entropy_pr[] = {
+static const unsigned char entropy_pr[] = {
     0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
     0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
     0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
@@ -412,7 +412,7 @@ static const unsigned char result_pr[OUTPUT_LEN] = {
     0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
 
 /* From a NIST PR=false test vector */
-static unsigned char entropy_nopr[] = {
+static const unsigned char entropy_nopr[] = {
     0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
     0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
     0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
@@ -461,7 +461,7 @@ int hmac_drbg_self_test( int verbose )
 
     test_offset = 0;
     CHK( hmac_drbg_init( &ctx, md_info,
-                         hmac_drbg_self_test_entropy, entropy_pr,
+                         hmac_drbg_self_test_entropy, (void *) entropy_pr,
                          NULL, 0 ) );
     hmac_drbg_set_prediction_resistance( &ctx, POLARSSL_HMAC_DRBG_PR_ON );
     CHK( hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
@@ -480,7 +480,7 @@ int hmac_drbg_self_test( int verbose )
 
     test_offset = 0;
     CHK( hmac_drbg_init( &ctx, md_info,
-                         hmac_drbg_self_test_entropy, entropy_nopr,
+                         hmac_drbg_self_test_entropy, (void *) entropy_nopr,
                          NULL, 0 ) );
     CHK( hmac_drbg_reseed( &ctx, NULL, 0 ) );
     CHK( hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
diff --git a/library/md5.c b/library/md5.c
index a14a9cf7d..49f0674fb 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -443,7 +443,7 @@ void md5_hmac( const unsigned char *key, size_t keylen,
 /*
  * RFC 1321 test vectors
  */
-static unsigned char md5_test_buf[7][81] =
+static const unsigned char md5_test_buf[7][81] =
 {
     { "" },
     { "a" },
@@ -481,7 +481,7 @@ static const unsigned char md5_test_sum[7][16] =
 /*
  * RFC 2202 test vectors
  */
-static unsigned char md5_hmac_test_key[7][26] =
+static const unsigned char md5_hmac_test_key[7][26] =
 {
     { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B" },
     { "Jefe" },
@@ -498,7 +498,7 @@ static const int md5_hmac_test_keylen[7] =
     16, 4, 16, 25, 16, 80, 80
 };
 
-static unsigned char md5_hmac_test_buf[7][74] =
+static const unsigned char md5_hmac_test_buf[7][74] =
 {
     { "Hi There" },
     { "what do ya want for nothing?" },
diff --git a/library/pkcs5.c b/library/pkcs5.c
index 65f3d5dd5..c1bab70a3 100644
--- a/library/pkcs5.c
+++ b/library/pkcs5.c
@@ -300,10 +300,10 @@ int pkcs5_self_test( int verbose )
 
 #define MAX_TESTS   6
 
-static size_t plen[MAX_TESTS] =
+static const size_t plen[MAX_TESTS] =
     { 8, 8, 8, 24, 9 };
 
-static unsigned char password[MAX_TESTS][32] =
+static const unsigned char password[MAX_TESTS][32] =
 {
     "password",
     "password",
@@ -312,10 +312,10 @@ static unsigned char password[MAX_TESTS][32] =
     "pass\0word",
 };
 
-static size_t slen[MAX_TESTS] =
+static const size_t slen[MAX_TESTS] =
     { 4, 4, 4, 36, 5 };
 
-static unsigned char salt[MAX_TESTS][40] =
+static const unsigned char salt[MAX_TESTS][40] =
 {
     "salt",
     "salt",
@@ -324,13 +324,13 @@ static unsigned char salt[MAX_TESTS][40] =
     "sa\0lt",
 };
 
-static uint32_t it_cnt[MAX_TESTS] =
+static const uint32_t it_cnt[MAX_TESTS] =
     { 1, 2, 4096, 4096, 4096 };
 
-static uint32_t key_len[MAX_TESTS] =
+static const uint32_t key_len[MAX_TESTS] =
     { 20, 20, 20, 25, 16 };
 
-static unsigned char result_key[MAX_TESTS][32] =
+static const unsigned char result_key[MAX_TESTS][32] =
 {
     { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
       0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
diff --git a/library/sha1.c b/library/sha1.c
index 35e062583..fca6109bb 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -476,7 +476,7 @@ void sha1_hmac( const unsigned char *key, size_t keylen,
 /*
  * FIPS-180-1 test vectors
  */
-static unsigned char sha1_test_buf[3][57] =
+static const unsigned char sha1_test_buf[3][57] =
 {
     { "abc" },
     { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
@@ -501,7 +501,7 @@ static const unsigned char sha1_test_sum[3][20] =
 /*
  * RFC 2202 test vectors
  */
-static unsigned char sha1_hmac_test_key[7][26] =
+static const unsigned char sha1_hmac_test_key[7][26] =
 {
     { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B"
       "\x0B\x0B\x0B\x0B" },
@@ -521,7 +521,7 @@ static const int sha1_hmac_test_keylen[7] =
     20, 4, 20, 25, 20, 80, 80
 };
 
-static unsigned char sha1_hmac_test_buf[7][74] =
+static const unsigned char sha1_hmac_test_buf[7][74] =
 {
     { "Hi There" },
     { "what do ya want for nothing?" },
diff --git a/library/sha256.c b/library/sha256.c
index b9b3f097b..2b4b7e132 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -483,7 +483,7 @@ void sha256_hmac( const unsigned char *key, size_t keylen,
 /*
  * FIPS-180-2 test vectors
  */
-static unsigned char sha256_test_buf[3][57] =
+static const unsigned char sha256_test_buf[3][57] =
 {
     { "abc" },
     { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
@@ -533,7 +533,7 @@ static const unsigned char sha256_test_sum[6][32] =
 /*
  * RFC 4231 test vectors
  */
-static unsigned char sha256_hmac_test_key[7][26] =
+static const unsigned char sha256_hmac_test_key[7][26] =
 {
     { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B"
       "\x0B\x0B\x0B\x0B" },
@@ -553,7 +553,7 @@ static const int sha256_hmac_test_keylen[7] =
     20, 4, 20, 25, 20, 131, 131
 };
 
-static unsigned char sha256_hmac_test_buf[7][153] =
+static const unsigned char sha256_hmac_test_buf[7][153] =
 {
     { "Hi There" },
     { "what do ya want for nothing?" },
diff --git a/library/sha512.c b/library/sha512.c
index 629ed1b58..4074d33d9 100644
--- a/library/sha512.c
+++ b/library/sha512.c
@@ -488,7 +488,7 @@ void sha512_hmac( const unsigned char *key, size_t keylen,
 /*
  * FIPS-180-2 test vectors
  */
-static unsigned char sha512_test_buf[3][113] =
+static const unsigned char sha512_test_buf[3][113] =
 {
     { "abc" },
     { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
@@ -557,7 +557,7 @@ static const unsigned char sha512_test_sum[6][64] =
 /*
  * RFC 4231 test vectors
  */
-static unsigned char sha512_hmac_test_key[7][26] =
+static const unsigned char sha512_hmac_test_key[7][26] =
 {
     { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B"
       "\x0B\x0B\x0B\x0B" },
@@ -577,7 +577,7 @@ static const int sha512_hmac_test_keylen[7] =
     20, 4, 20, 25, 20, 131, 131
 };
 
-static unsigned char sha512_hmac_test_buf[7][153] =
+static const unsigned char sha512_hmac_test_buf[7][153] =
 {
     { "Hi There" },
     { "what do ya want for nothing?" },