diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index 339b4d3f8..77546c586 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -17,10 +17,22 @@ PEM write (exactly two lines + 1)
 mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n"
 
 PEM read (DES-EDE3-CBC + invalid iv)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":MBEDTLS_ERR_PEM_INVALID_ENC_IV
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV
 
 PEM read (DES-CBC + invalid iv)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":MBEDTLS_ERR_PEM_INVALID_ENC_IV
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":"pwd":MBEDTLS_ERR_PEM_INVALID_ENC_IV
 
 PEM read (unknown encryption algorithm)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":"pwd":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG
+
+PEM read (malformed PEM DES-CBC)
+depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC
+mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH
+
+PEM read (malformed PEM DES-EDE3-CBC)
+depends_on:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC
+mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH
+
+PEM read (malformed PEM AES-128-CBC)
+depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
+mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,AA94892A169FA426AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
diff --git a/tests/suites/test_suite_pem.function b/tests/suites/test_suite_pem.function
index 5e022109c..c24595d47 100644
--- a/tests/suites/test_suite_pem.function
+++ b/tests/suites/test_suite_pem.function
@@ -1,6 +1,8 @@
 /* BEGIN_HEADER */
 #include "mbedtls/base64.h"
 #include "mbedtls/pem.h"
+#include "mbedtls/des.h"
+#include "mbedtls/aes.h"
 /* END_HEADER */
 
 /* BEGIN_CASE depends_on:MBEDTLS_PEM_WRITE_C */
@@ -35,16 +37,19 @@ exit:
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_AES_C:MBEDTLS_DES_C:MBEDTLS_MD5_C:MBEDTLS_CIPHER_MODE_CBC */
-void mbedtls_pem_read_buffer( char *header, char *footer, char *data, int ret )
+void mbedtls_pem_read_buffer( char *header, char *footer, char *data,
+                              char *pwd, int res )
 {
     mbedtls_pem_context ctx;
+    int ret;
     size_t use_len = 0;
+    size_t pwd_len = strlen( pwd );
 
     mbedtls_pem_init( &ctx );
 
-    TEST_ASSERT( mbedtls_pem_read_buffer( &ctx, header, footer,
-                                          (const unsigned char *)data, NULL, 0,
-                                          &use_len ) == ret );
+    ret = mbedtls_pem_read_buffer( &ctx, header, footer, (unsigned char *)data,
+                (unsigned char *)pwd, pwd_len, &use_len );
+    TEST_ASSERT( ret == res );
 
 exit:
     mbedtls_pem_free( &ctx );