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- Clarified use of AES and Camellia in CFB and CTR modes

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Paul Bakker 2011-10-06 13:11:08 +00:00
parent 490ecc8c3e
commit ca6f3e24a4
3 changed files with 20 additions and 0 deletions
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3
ChangeLog
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@ -9,6 +9,9 @@ Features
supported version to a server to help buggy server implementations. supported version to a server to help buggy server implementations.
(Closes ticket #36) (Closes ticket #36)
Changes
* Documentation for AES and Camellia in modes CTR and CFB128 clarified.
= Version 1.0.0 released on 2011-07-27 = Version 1.0.0 released on 2011-07-27
Features Features
* Expanded cipher layer with support for CFB128 and CTR mode * Expanded cipher layer with support for CFB128 and CTR mode

9
include/polarssl/aes.h
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@ -111,6 +111,11 @@ int aes_crypt_cbc( aes_context *ctx,
/** /**
* \brief AES-CFB128 buffer encryption/decryption. * \brief AES-CFB128 buffer encryption/decryption.
* *
* Note: Due to the nature of CFB you should use the same key schedule for
* both encryption and decryption. So a context initialized with
* aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
*
* both
* \param ctx AES context * \param ctx AES context
* \param mode AES_ENCRYPT or AES_DECRYPT * \param mode AES_ENCRYPT or AES_DECRYPT
* \param length length of the input data * \param length length of the input data
@ -134,6 +139,10 @@ int aes_crypt_cfb128( aes_context *ctx,
* *
* Warning: You have to keep the maximum use of your counter in mind! * Warning: You have to keep the maximum use of your counter in mind!
* *
* Note: Due to the nature of CTR you should use the same key schedule for
* both encryption and decryption. So a context initialized with
* aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.
*
* \param length The length of the data * \param length The length of the data
* \param nc_off The offset in the current stream_block (for resuming * \param nc_off The offset in the current stream_block (for resuming
* within current cipher stream). The offset pointer to * within current cipher stream). The offset pointer to

8
include/polarssl/camellia.h
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@ -117,6 +117,10 @@ int camellia_crypt_cbc( camellia_context *ctx,
/** /**
* \brief CAMELLIA-CFB128 buffer encryption/decryption * \brief CAMELLIA-CFB128 buffer encryption/decryption
* *
* Note: Due to the nature of CFB you should use the same key schedule for
* both encryption and decryption. So a context initialized with
* camellia_setkey_enc() for both CAMELLIA_ENCRYPT and CAMELLIE_DECRYPT.
*
* \param ctx CAMELLIA context * \param ctx CAMELLIA context
* \param mode CAMELLIA_ENCRYPT or CAMELLIA_DECRYPT * \param mode CAMELLIA_ENCRYPT or CAMELLIA_DECRYPT
* \param length length of the input data * \param length length of the input data
@ -140,6 +144,10 @@ int camellia_crypt_cfb128( camellia_context *ctx,
* *
* Warning: You have to keep the maximum use of your counter in mind! * Warning: You have to keep the maximum use of your counter in mind!
* *
* Note: Due to the nature of CTR you should use the same key schedule for
* both encryption and decryption. So a context initialized with
* camellia_setkey_enc() for both CAMELLIA_ENCRYPT and CAMELLIA_DECRYPT.
*
* \param length The length of the data * \param length The length of the data
* \param nc_off The offset in the current stream_block (for resuming * \param nc_off The offset in the current stream_block (for resuming
* within current cipher stream). The offset pointer to * within current cipher stream). The offset pointer to