diff --git a/include/polarssl/cipher.h b/include/polarssl/cipher.h index d4231ff2b6..b520d92e01 100644 --- a/include/polarssl/cipher.h +++ b/include/polarssl/cipher.h @@ -107,6 +107,7 @@ typedef enum { typedef enum { POLARSSL_PADDING_PKCS7 = 0, /**< PKCS7 padding (default) */ POLARSSL_PADDING_ONE_AND_ZEROS, /**< ISO/IEC 7816-4 padding */ + POLARSSL_PADDING_ZEROS_AND_LEN, /**< ANSI X.923 padding */ } cipher_padding_t; typedef enum { diff --git a/library/cipher.c b/library/cipher.c index 9a750db08d..1abc47d316 100644 --- a/library/cipher.c +++ b/library/cipher.c @@ -594,6 +594,42 @@ static int get_one_and_zeros_padding( unsigned char *input, size_t input_len, return 0; } +/* + * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length + */ +static void add_zeros_and_len_padding( unsigned char *output, + size_t output_len, size_t data_len ) +{ + size_t padding_len = output_len - data_len; + unsigned char i = 0; + + for( i = 1; i < padding_len; i++ ) + output[data_len + i - 1] = 0x00; + output[output_len - 1] = (unsigned char) padding_len; +} + +static int get_zeros_and_len_padding( unsigned char *input, size_t input_len, + size_t *data_len ) +{ + unsigned int i, padding_len = 0; + + if( NULL == input || NULL == data_len ) + return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; + + padding_len = input[input_len - 1]; + + if( padding_len > input_len || padding_len == 0 ) + return POLARSSL_ERR_CIPHER_INVALID_PADDING; + + for( i = input_len - padding_len; i < input_len - 1; i++ ) + if( input[i] != 0x00 ) + return POLARSSL_ERR_CIPHER_INVALID_PADDING; + + *data_len = input_len - padding_len; + + return 0; +} + int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen) { int ret = 0; @@ -666,6 +702,13 @@ int cipher_set_padding_mode( cipher_context_t *ctx, cipher_padding_t mode ) return 0; } + if( POLARSSL_PADDING_ZEROS_AND_LEN == mode ) + { + ctx->add_padding = add_zeros_and_len_padding; + ctx->get_padding = get_zeros_and_len_padding; + return 0; + } + return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA; } diff --git a/tests/suites/test_suite_cipher.aes.data b/tests/suites/test_suite_cipher.aes.data index 5b9ac1bca6..0ec541a489 100644 --- a/tests/suites/test_suite_cipher.aes.data +++ b/tests/suites/test_suite_cipher.aes.data @@ -125,6 +125,66 @@ AES Encrypt and decrypt 49 bytes with one and zeros padding depends_on:POLARSSL_AES_C enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:49:POLARSSL_PADDING_ONE_AND_ZEROS +AES Encrypt and decrypt 0 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:0:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 1 byte with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:1:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 2 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:2:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 7 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:7:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 8 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:8:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 9 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:9:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 15 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:15:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 16 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:16:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 17 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:17:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 31 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:31:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:32:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 33 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:33:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 47 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:47:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 48 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:48:POLARSSL_PADDING_ZEROS_AND_LEN + +AES Encrypt and decrypt 49 bytes with zeros and len padding +depends_on:POLARSSL_AES_C +enc_dec_buf:POLARSSL_CIPHER_AES_128_CBC:AES-128-CBC:128:49:POLARSSL_PADDING_ZEROS_AND_LEN + AES Encrypt and decrypt 0 bytes in multiple parts depends_on:POLARSSL_AES_C enc_dec_buf_multipart:POLARSSL_CIPHER_AES_128_CBC:128:0:0: diff --git a/tests/suites/test_suite_cipher.blowfish.data b/tests/suites/test_suite_cipher.blowfish.data index b8f615dbbe..9d09611b83 100644 --- a/tests/suites/test_suite_cipher.blowfish.data +++ b/tests/suites/test_suite_cipher.blowfish.data @@ -125,6 +125,66 @@ BLOWFISH Encrypt and decrypt 49 bytes with one and zeros padding depends_on:POLARSSL_BLOWFISH_C enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:49:POLARSSL_PADDING_ONE_AND_ZEROS +BLOWFISH Encrypt and decrypt 0 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:0:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 1 byte with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:1:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 2 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:2:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 7 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:7:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 8 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:8:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 9 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:9:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 15 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:15:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 16 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:16:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 17 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:17:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 31 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:31:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:32:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:33:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 47 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:47:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 48 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:48:POLARSSL_PADDING_ZEROS_AND_LEN + +BLOWFISH Encrypt and decrypt 49 bytes with zeros and len padding +depends_on:POLARSSL_BLOWFISH_C +enc_dec_buf:POLARSSL_CIPHER_BLOWFISH_CBC:BLOWFISH-CBC:128:49:POLARSSL_PADDING_ZEROS_AND_LEN + BLOWFISH Encrypt and decrypt 0 bytes in multiple parts depends_on:POLARSSL_BLOWFISH_C enc_dec_buf_multipart:POLARSSL_CIPHER_BLOWFISH_CBC:128:0:0: diff --git a/tests/suites/test_suite_cipher.camellia.data b/tests/suites/test_suite_cipher.camellia.data index fd469ee5e6..eadd9eb205 100644 --- a/tests/suites/test_suite_cipher.camellia.data +++ b/tests/suites/test_suite_cipher.camellia.data @@ -125,6 +125,66 @@ CAMELLIA Encrypt and decrypt 49 bytes with one and zeros padding depends_on:POLARSSL_CAMELLIA_C enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:49:POLARSSL_PADDING_ONE_AND_ZEROS +CAMELLIA Encrypt and decrypt 0 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:0:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 1 byte with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:1:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 2 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:2:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 7 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:7:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 8 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:8:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 9 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:9:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 15 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:15:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 16 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:16:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 17 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:17:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 31 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:31:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:32:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:33:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 47 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:47:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 48 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:48:POLARSSL_PADDING_ZEROS_AND_LEN + +CAMELLIA Encrypt and decrypt 49 bytes with zeros and len padding +depends_on:POLARSSL_CAMELLIA_C +enc_dec_buf:POLARSSL_CIPHER_CAMELLIA_128_CBC:CAMELLIA-128-CBC:128:49:POLARSSL_PADDING_ZEROS_AND_LEN + CAMELLIA Encrypt and decrypt 0 bytes in multiple parts depends_on:POLARSSL_CAMELLIA_C enc_dec_buf_multipart:POLARSSL_CIPHER_CAMELLIA_128_CBC:128:0:0: diff --git a/tests/suites/test_suite_cipher.des.data b/tests/suites/test_suite_cipher.des.data index 7fc83d5421..5bcf6036fa 100644 --- a/tests/suites/test_suite_cipher.des.data +++ b/tests/suites/test_suite_cipher.des.data @@ -125,6 +125,66 @@ DES Encrypt and decrypt 49 bytes with one and zeros padding depends_on:POLARSSL_DES_C enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:49:POLARSSL_PADDING_ONE_AND_ZEROS +DES Encrypt and decrypt 0 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:0:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 1 byte with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:1:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 2 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:2:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 7 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:7:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 8 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:8:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 9 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:9:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 15 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:15:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 16 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:16:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 17 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:17:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 31 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:31:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:32:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 32 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:33:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 47 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:47:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 48 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:48:POLARSSL_PADDING_ZEROS_AND_LEN + +DES Encrypt and decrypt 49 bytes with zeros and len padding +depends_on:POLARSSL_DES_C +enc_dec_buf:POLARSSL_CIPHER_DES_CBC:DES-CBC:56:49:POLARSSL_PADDING_ZEROS_AND_LEN + DES Encrypt and decrypt 0 bytes in multiple parts depends_on:POLARSSL_DES_C enc_dec_buf_multipart:POLARSSL_CIPHER_DES_CBC:56:0:0: diff --git a/tests/suites/test_suite_cipher.padding.data b/tests/suites/test_suite_cipher.padding.data index 6548d568db..51bc222b64 100644 --- a/tests/suites/test_suite_cipher.padding.data +++ b/tests/suites/test_suite_cipher.padding.data @@ -102,3 +102,21 @@ check_padding:POLARSSL_PADDING_ONE_AND_ZEROS:"DABBAD0000":POLARSSL_ERR_CIPHER_IN Check one and zeros padding #7 (overlong) check_padding:POLARSSL_PADDING_ONE_AND_ZEROS:"0000000000":POLARSSL_ERR_CIPHER_INVALID_PADDING:4 + +Check zeros and len padding #1 (correct) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"DABBAD0001":0:4 + +Check zeros and len padding #2 (correct) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"DABBAD000002":0:4 + +Check zeros and len padding #3 (correct) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"DABBAD000003":0:3 + +Check zeros and len padding #4 (correct) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"000003":0:0 + +Check zeros and len padding #5 (overlong) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"000004":POLARSSL_ERR_CIPHER_INVALID_PADDING:0 + +Check zeros and len padding #6 (not enough zeros) +check_padding:POLARSSL_PADDING_ZEROS_AND_LEN:"DABBAD000004":POLARSSL_ERR_CIPHER_INVALID_PADDING:0