diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/buffer.c | 76 | ||||
| -rw-r--r-- | src/error.c | 66 |
2 files changed, 125 insertions, 17 deletions
diff --git a/src/buffer.c b/src/buffer.c index b4896f7..71ebad2 100644 --- a/src/buffer.c +++ b/src/buffer.c @@ -13,20 +13,40 @@ static unsigned char FULL_BLOCK_PADDING[16] = { 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16 }; -size_t aesni_encrypt_buffer_ecb128( +int aesni_encrypt_buffer_ecb128( const void* src, size_t src_size, void* dest, - AesNI_KeySchedule128* key_schedule) + size_t* dest_size, + AesNI_KeySchedule128* key_schedule, + AesNI_ErrorDetails* err_details) { - size_t rem_size = src_size % 16; - size_t padding_size = 16 - rem_size; - size_t dest_size = src_size + padding_size; + if (dest_size == NULL) + { + aesni_make_error_null_argument(err_details, "dest_size"); + return 1; + } + + const size_t rem_size = src_size % 16; + const size_t padding_size = 16 - rem_size; + *dest_size = src_size + padding_size; if (dest == NULL) - return dest_size; + return 0; - size_t src_len = src_size / 16; + if (src == NULL) + { + aesni_make_error_null_argument(err_details, "src"); + return 1; + } + + if (key_schedule == NULL) + { + aesni_make_error_null_argument(err_details, "key_schedule"); + return 1; + } + + const size_t src_len = src_size / 16; for (size_t i = 0; i < src_len; ++i, (char*) src += 16, (char*) dest += 16) { @@ -51,10 +71,10 @@ size_t aesni_encrypt_buffer_ecb128( AesNI_Block128 ciphertext = aesni_encrypt_block_ecb128(plaintext, key_schedule); aesni_store_block128(dest, ciphertext); - return dest_size; + return 0; } -static unsigned char get_padding_size(const unsigned char* padding) +static unsigned char get_pkcs7_padding_size(const unsigned char* padding) { if (padding[15] < 0x01 || padding[15] > 0x10) return 0; @@ -66,18 +86,38 @@ static unsigned char get_padding_size(const unsigned char* padding) return padding[15]; } -size_t aesni_decrypt_buffer_ecb128( +int aesni_decrypt_buffer_ecb128( const void* src, size_t src_size, void* dest, - AesNI_KeySchedule128* inverted_schedule) + size_t* dest_size, + AesNI_KeySchedule128* inverted_schedule, + AesNI_ErrorDetails* err_details) { - size_t dest_size = src_size; + if (dest_size == NULL) + { + aesni_make_error_null_argument(err_details, "dest_size"); + return 1; + } + + *dest_size = src_size; if (dest == NULL) - return dest_size; + return 0; + + if (src == NULL) + { + aesni_make_error_null_argument(err_details, "src"); + return 1; + } - size_t src_len = src_size / 16; + if (inverted_schedule == NULL) + { + aesni_make_error_null_argument(err_details, "inverted_schedule"); + return 1; + } + + const size_t src_len = src_size / 16; for (size_t i = 0; i < src_len - 1; ++i, (char*) src += 16, (char*) dest += 16) { @@ -91,15 +131,17 @@ size_t aesni_decrypt_buffer_ecb128( unsigned char padding[16]; aesni_store_block128(padding, plaintext); - unsigned char padding_size = get_padding_size(padding); + unsigned char padding_size = get_pkcs7_padding_size(padding); if (padding_size == 0) { - return dest_size - 16; + aesni_make_error_invalid_pkcs7_padding(err_details); + return 1; } else { memcpy(dest, padding, 16 - padding_size); - return dest_size - padding_size; + *dest_size -= padding_size; + return 0; } } diff --git a/src/error.c b/src/error.c new file mode 100644 index 0000000..c4af82c --- /dev/null +++ b/src/error.c @@ -0,0 +1,66 @@ +/** + * \file + * \author Egor Tensin <Egor.Tensin@gmail.com> + * \date 2015 + * \copyright This file is licensed under the terms of the MIT License. + * See LICENSE.txt for details. + */ + +#include <aesni/all.h> + +#include <stdlib.h> +#include <string.h> + +static const char* err_msgs[] = +{ + "Success", + "Invalid argument value NULL", + "Invalid PKCS7 padding (wrong key?)", +}; + +const char* aesni_strerror(AesNI_ErrorCode ec) +{ + return err_msgs[ec]; +} + +static void aesni_make_error( + AesNI_ErrorDetails* err_details, + AesNI_ErrorCode ec) +{ + if (err_details == NULL) + return; + + err_details->ec = ec; +} + +void aesni_make_error_success( + AesNI_ErrorDetails* err_details) +{ + if (err_details == NULL) + return; + + aesni_make_error(err_details, AESNI_ERROR_SUCCESS); +} + +void aesni_make_error_null_argument( + AesNI_ErrorDetails* err_details, + const char* arg_name) +{ + if (err_details == NULL) + return; + + aesni_make_error(err_details, AESNI_ERROR_NULL_ARGUMENT); + + const size_t arg_name_size = sizeof(err_details->params.null_arg.arg_name); + strncpy(err_details->params.null_arg.arg_name, arg_name, arg_name_size); + err_details->params.null_arg.arg_name[arg_name_size - 1] = '\0'; +} + +void aesni_make_error_invalid_pkcs7_padding( + AesNI_ErrorDetails* err_details) +{ + if (err_details == NULL) + return; + + aesni_make_error(err_details, AESNI_ERROR_INVALID_PKCS7_PADDING); +} |