Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 09/12] [Suspend2] Encryption configuration serialisation. | Date | Tue, 27 Jun 2006 14:38:34 +1000 |
| |
Add routines to read and write the encryption module configuration in an image header.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
kernel/power/encryption.c | 83 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 83 insertions(+), 0 deletions(-)
diff --git a/kernel/power/encryption.c b/kernel/power/encryption.c index d12eb47..1664b82 100644 --- a/kernel/power/encryption.c +++ b/kernel/power/encryption.c @@ -316,4 +316,87 @@ static unsigned long suspend_encrypt_sto (4 + strlen(suspend_encryptor_key) + strlen(suspend_encryptor_iv)) : 0); } + +/* suspend_encrypt_save_config_info + * + * Description: Save informaton needed when reloading the image at resume time. + * Arguments: Buffer: Pointer to a buffer of size PAGE_SIZE. + * Returns: Number of bytes used for saving our data. + */ +static int suspend_encrypt_save_config_info(char *buffer) +{ + int buf_offset, str_size; + str_size = strlen(suspend_encryptor_name); + *buffer = (char) str_size; + strncpy(buffer + 1, suspend_encryptor_name, str_size + 1); + buf_offset = str_size + 2; + + *(buffer + buf_offset) = (char) suspend_encryptor_mode; + buf_offset++; + + *(buffer + buf_offset) = (char) suspend_encryptor_save_key_and_iv; + buf_offset++; + + if (suspend_encryptor_save_key_and_iv) { + + str_size = strlen(suspend_encryptor_key); + *(buffer + buf_offset) = (char) str_size; + strncpy(buffer + buf_offset + 1, suspend_encryptor_key, str_size + 1); + + buf_offset+= str_size + 2; + + str_size = strlen(suspend_encryptor_iv); + *(buffer + buf_offset) = (char) str_size; + strncpy(buffer + buf_offset + 1, suspend_encryptor_iv, str_size + 1); + + buf_offset += str_size + 2; + } + + return buf_offset; +} + +/* suspend_encrypt_load_config_info + * + * Description: Reload information needed for deencrypting the image at + * resume time. + * Arguments: Buffer: Pointer to the start of the data. + * Size: Number of bytes that were saved. + */ +static void suspend_encrypt_load_config_info(char *buffer, int size) +{ + int buf_offset, str_size; + + str_size = (int) *buffer; + strncpy(suspend_encryptor_name, buffer + 1, str_size + 1); + buf_offset = str_size + 2; + + suspend_encryptor_mode = (int) *(buffer + buf_offset); + buf_offset++; + + suspend_encryptor_save_key_and_iv = (int) *(buffer + buf_offset); + buf_offset++; + + if (suspend_encryptor_save_key_and_iv) { + str_size = (int) *(buffer + buf_offset); + strncpy(suspend_encryptor_key, buffer + buf_offset + 1, str_size + 1); + + buf_offset+= str_size + 2; + + str_size = (int) *(buffer + buf_offset); + strncpy(suspend_encryptor_iv, buffer + buf_offset + 1, str_size + 1); + + buf_offset += str_size + 2; + } else { + *suspend_encryptor_key = 0; + *suspend_encryptor_iv = 0; + } + + if (buf_offset != size) { + printk("Suspend Encryptor config info size mismatch (%d != %d): settings ignored.\n", + buf_offset, size); + *suspend_encryptor_key = 0; + *suspend_encryptor_iv = 0; + } + return; +} -- Nigel Cunningham nigel at suspend2 dot net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |