diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index 32d3c279b5..df9663b18c 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -59,6 +59,18 @@ mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KE
 
 # The text "hello world" (which is clearly not a valid ASN.1 SEQUENCE) is encoded
 # with AES-128-CBC to prove that ASN.1 parsing after decoding fails.
+# Since PBKDF1 isn't supported in OpenSSL, here's the steps:
+# 1. generate the key (password="password";  IV=0x3132333435363738 in hex or "12345678" as string)
+#       echo -n "password12345678" | openssl md5
+# 2. encode data
+#       echo -n "hello world" | openssl aes-128-cbc -e -base64 -p -K "bbb0ddff1b944b3cc68eaaeb7ac20099" -iv "3132333435363738"
 PEM read (Invalid SEQUENCE encoded with AES-128-CBC)
 depends_on:MBEDTLS_MD_CAN_MD5: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,765FCB151B573FC9E5FB3A0E5A198785\n\nU2FsdGVkX1/+Vl2WMhEy3zcdg14R+flkg/pW4ei4d0I=\n-----END EC PRIVATE KEY-----":"pwdpwd":MBEDTLS_ERR_PEM_INVALID_DATA + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG:""
+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,31323334353637380000000000000000\n\nDfRGkwS+VjvR0IYsjZwW6Q==\n-----END EC PRIVATE KEY-----":"password":MBEDTLS_ERR_PEM_INVALID_DATA + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG:""
+
+# Same as above, but with invalid padding data.
+# Generated with:
+#   echo -n -e "\x68\x65\x6c\x6c\x6f\x20\x77\x6f\x72\x6c\x64\x01\x02\x03\x04\x05" | openssl aes-128-cbc -e -base64 -p -K "bbb0ddff1b944b3cc68eaaeb7ac20099" -iv "3132333435363738" -nopad
+PEM read (Invalid padding data for AES-128-CBC)
+depends_on:MBEDTLS_MD_CAN_MD5: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,31323334353637380000000000000000\n\n333hxynfxEdXrSHQfIabxQ==\n-----END EC PRIVATE KEY-----":"password":MBEDTLS_ERR_PEM_BAD_INPUT_DATA:""