diff --git a/library/ctr_drbg.c b/library/ctr_drbg.c
index a604ec0..a00d66c 100644
--- a/library/ctr_drbg.c
+++ b/library/ctr_drbg.c
@@ -828,7 +828,7 @@
                         return( 1 );                        \
                     }
 
-#define SELF_TEST_OUPUT_DISCARD_LENGTH 64
+#define SELF_TEST_OUTPUT_DISCARD_LENGTH 64
 
 /*
  * Checkup routine
@@ -854,7 +854,7 @@
                                 (void *) entropy_source_pr,
                                 pers_pr, MBEDTLS_CTR_DRBG_KEYSIZE ) );
     mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
-    CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
+    CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUTPUT_DISCARD_LENGTH ) );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_pr ) ) );
     CHK( memcmp( buf, result_pr, sizeof( result_pr ) ) );
 
@@ -879,7 +879,7 @@
                                 (void *) entropy_source_nopr,
                                 pers_nopr, MBEDTLS_CTR_DRBG_KEYSIZE ) );
     CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
-    CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
+    CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUTPUT_DISCARD_LENGTH ) );
     CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_nopr ) ) );
     CHK( memcmp( buf, result_nopr, sizeof( result_nopr ) ) );
 
diff --git a/library/ecdh.c b/library/ecdh.c
index 9dfa868..60c6e42 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -399,7 +399,7 @@
 }
 
 /*
- * Read the ServerKeyExhange parameters (RFC 4492)
+ * Read the ServerKeyExchange parameters (RFC 4492)
  *      struct {
  *          ECParameters    curve_params;
  *          ECPoint         public;
diff --git a/library/mps_common.h b/library/mps_common.h
index d20776f..668876c 100644
--- a/library/mps_common.h
+++ b/library/mps_common.h
@@ -51,7 +51,7 @@
  *  the function's behavior is entirely undefined.
  *  In addition to state integrity, all MPS structures have a more refined
  *  notion of abstract state that the API operates on. For example, all layers
- *  have a notion of 'abtract read state' which indicates if incoming data has
+ *  have a notion of 'abstract read state' which indicates if incoming data has
  *  been passed to the user, e.g. through mps_l2_read_start() for Layer 2
  *  or mps_l3_read() in Layer 3. After such a call, it doesn't make sense to
  *  call these reading functions again until the incoming data has been