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- Support for DES weak keys and parity bits added

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This commit is contained in:
Paul Bakker 2011-01-15 17:32:24 +00:00
parent f92d7a8c81
commit 1f87fb6896
5 changed files with 179 additions and 14 deletions
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42
include/polarssl/des.h
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@ -32,6 +32,8 @@
#define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH -0x0C00
#define DES_KEY_SIZE 8
/**
* \brief DES context structure
*/
@ -56,6 +58,34 @@ des3_context;
extern "C" {
#endif
/**
* \brief Set key parity on the given key to odd.
*
* DES keys are 56 bits long, but each byte is padded with
* a parity bit to allow verification.
*
* \param key 8-byte secret key
*/
void des_key_set_parity( unsigned char key[DES_KEY_SIZE] );
/**
* \brief Check that key parity on the given key is odd.
*
* DES keys are 56 bits long, but each byte is padded with
* a parity bit to allow verification.
*
* \param key 8-byte secret key
*/
int des_key_check_key_parity( const unsigned char key[DES_KEY_SIZE] );
/**
* \brief Check that key is not a weak or semi-weak DES key
*
* \param key 8-byte secret key
*/
int des_key_check_weak( const unsigned char key[DES_KEY_SIZE] );
/**
* \brief DES key schedule (56-bit, encryption)
*
@ -64,7 +94,7 @@ extern "C" {
*
* \return 0
*/
int des_setkey_enc( des_context *ctx, const unsigned char key[8] );
int des_setkey_enc( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
/**
* \brief DES key schedule (56-bit, decryption)
@ -74,7 +104,7 @@ int des_setkey_enc( des_context *ctx, const unsigned char key[8] );
*
* \return 0
*/
int des_setkey_dec( des_context *ctx, const unsigned char key[8] );
int des_setkey_dec( des_context *ctx, const unsigned char key[DES_KEY_SIZE] );
/**
* \brief Triple-DES key schedule (112-bit, encryption)
@ -84,7 +114,7 @@ int des_setkey_dec( des_context *ctx, const unsigned char key[8] );
*
* \return 0
*/
int des3_set2key_enc( des3_context *ctx, const unsigned char key[16] );
int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
/**
* \brief Triple-DES key schedule (112-bit, decryption)
@ -94,7 +124,7 @@ int des3_set2key_enc( des3_context *ctx, const unsigned char key[16] );
*
* \return 0
*/
int des3_set2key_dec( des3_context *ctx, const unsigned char key[16] );
int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
/**
* \brief Triple-DES key schedule (168-bit, encryption)
@ -104,7 +134,7 @@ int des3_set2key_dec( des3_context *ctx, const unsigned char key[16] );
*
* \return 0
*/
int des3_set3key_enc( des3_context *ctx, const unsigned char key[24] );
int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
/**
* \brief Triple-DES key schedule (168-bit, decryption)
@ -114,7 +144,7 @@ int des3_set3key_enc( des3_context *ctx, const unsigned char key[24] );
*
* \return 0
*/
int des3_set3key_dec( des3_context *ctx, const unsigned char key[24] );
int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
/**
* \brief DES-ECB block encryption/decryption