Padding Functions

Functions

GWENHYWFAR_API int GWEN_Padd_AddPkcs1Pss (uint8_t *pDestBuffer, uint32_t lDestBuffer, uint32_t nbits, const uint8_t *pHash, uint32_t lHash, uint32_t lSalt, GWEN_MDIGEST *md)
GWENHYWFAR_API int GWEN_Padd_ApplyPaddAlgo (const GWEN_CRYPT_PADDALGO *a, GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_MGF1 (uint8_t *pDestBuffer, uint32_t lDestBuffer, const uint8_t *pSeed, uint32_t lSeed, GWEN_MDIGEST *md)
GWENHYWFAR_API int GWEN_Padd_PaddWithAnsiX9_23 (GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_PaddWithISO9796 (GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_PaddWithIso9796_2 (GWEN_BUFFER *buf, int dstSize)
GWENHYWFAR_API int GWEN_Padd_PaddWithPkcs1Bt1 (GWEN_BUFFER *src, int dstSize)
GWENHYWFAR_API int GWEN_Padd_PaddWithPkcs1Bt2 (GWEN_BUFFER *src, int dstSize)
GWENHYWFAR_API int GWEN_Padd_UnapplyPaddAlgo (const GWEN_CRYPT_PADDALGO *a, GWEN_BUFFER *buf)
GWENHYWFAR_API int GWEN_Padd_UnpaddWithAnsiX9_23 (GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_UnpaddWithIso9796_2 (GWEN_BUFFER *buf)
GWENHYWFAR_API int GWEN_Padd_UnpaddWithPkcs1Bt1 (GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_UnpaddWithPkcs1Bt2 (GWEN_BUFFER *src)
GWENHYWFAR_API int GWEN_Padd_VerifyPkcs1Pss (const uint8_t *pSrcBuffer, uint32_t lSrcBuffer, uint32_t nbits, const uint8_t *pHash, uint32_t lHash, uint32_t lSalt, GWEN_MDIGEST *md)

Detailed Description

These functions are used for padding when encrypting/decrypting data using 2-key-triple-DES or when signing data. The original code (in C++) has been written by Fabian Kaiser for OpenHBCI (file rsakey.cpp). Translated to C and slightly modified by me (Martin Preuss)


Function Documentation

GWENHYWFAR_API int GWEN_Padd_AddPkcs1Pss ( uint8_t *  pDestBuffer,
uint32_t  lDestBuffer,
uint32_t  nbits,
const uint8_t *  pHash,
uint32_t  lHash,
uint32_t  lSalt,
GWEN_MDIGEST md 
)
Parameters:
nbits number of actual bits of the modulus

Definition at line 465 of file padd.c.

References DBG_INFO, GWEN_Crypt_Random(), GWEN_LOGDOMAIN, GWEN_MDigest_Begin(), GWEN_MDigest_End(), GWEN_MDigest_GetDigestPtr(), GWEN_MDigest_GetDigestSize(), GWEN_MDigest_Update(), GWEN_Padd_MGF1(), NULL, and nullarray.

Referenced by GWEN_Crypt_TokenFile__Sign().

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GWENHYWFAR_API int GWEN_Padd_ApplyPaddAlgo ( const GWEN_CRYPT_PADDALGO a,
GWEN_BUFFER src 
)
GWENHYWFAR_API int GWEN_Padd_MGF1 ( uint8_t *  pDestBuffer,
uint32_t  lDestBuffer,
const uint8_t *  pSeed,
uint32_t  lSeed,
GWEN_MDIGEST md 
)

Definition at line 407 of file padd.c.

References DBG_INFO, GWEN_LOGDOMAIN, GWEN_MDigest_Begin(), GWEN_MDigest_End(), GWEN_MDigest_GetDigestPtr(), GWEN_MDigest_GetDigestSize(), and GWEN_MDigest_Update().

Referenced by GWEN_Padd_AddPkcs1Pss(), and GWEN_Padd_VerifyPkcs1Pss().

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GWENHYWFAR_API int GWEN_Padd_PaddWithAnsiX9_23 ( GWEN_BUFFER src  ) 

This function is used to pad the plain text data to a multiple of 8 bytes size before encrypting it. This is done by adding bytes to the buffer until its length is multiple of 8 bytes. The byte added is the number of padding bytes appended. Example: Buffer initially contains 5 bytes, so 3 bytes are needed to make the buffer length a multiple of 8. So the number "3" is added three times. Please note that if the buffer initially has a multiple of 8 bytes then 8 bytes are added (this is needed to make sure the unpadd function can always recover data padded in this manner).

Definition at line 227 of file padd.c.

References GWEN_Buffer_AppendByte(), and GWEN_Buffer_GetUsedBytes().

Referenced by GWEN_CryptMgr_Encrypt(), and GWEN_Padd_ApplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_PaddWithISO9796 ( GWEN_BUFFER src  ) 

This function padds the given buffer according to ISO9796. The given buffer is expected to contain a 20 byte hash created using RIPEMD 160. This is padded to 96 bytes according to ISO 9796 (including appendix A4).

Definition at line 74 of file padd.c.

References DBG_INFO, GWEN_Buffer_AppendBytes(), GWEN_Buffer_Crop(), GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_Buffer_Reset(), GWEN_LOGDOMAIN, and GWEN_Padd_permutate().

Referenced by GWEN_Padd_ApplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_PaddWithIso9796_2 ( GWEN_BUFFER buf,
int  dstSize 
)

This function padds according to ISO 8786-2.

Definition at line 145 of file padd.c.

References DBG_ERROR, GWEN_Buffer_AppendByte(), GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_Buffer_InsertRoom(), GWEN_Buffer_Rewind(), GWEN_Crypt_Random(), GWEN_ERROR_GENERIC, GWEN_ERROR_INVALID, and GWEN_LOGDOMAIN.

Referenced by check2(), GWEN_CryptMgrKeys_EncryptKey(), GWEN_CryptMgrKeys_SignData(), and GWEN_Padd_ApplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_PaddWithPkcs1Bt1 ( GWEN_BUFFER src,
int  dstSize 
)

Definition at line 264 of file padd.c.

References DBG_ERROR, GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_Buffer_InsertRoom(), GWEN_Buffer_Rewind(), GWEN_ERROR_GENERIC, GWEN_ERROR_INVALID, and GWEN_LOGDOMAIN.

Referenced by GWEN_Padd_ApplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_PaddWithPkcs1Bt2 ( GWEN_BUFFER src,
int  dstSize 
)

Definition at line 302 of file padd.c.

References DBG_ERROR, GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_Buffer_InsertRoom(), GWEN_Buffer_Rewind(), GWEN_Crypt_Random(), GWEN_ERROR_GENERIC, GWEN_ERROR_INVALID, and GWEN_LOGDOMAIN.

Referenced by GWEN_Padd_ApplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_UnapplyPaddAlgo ( const GWEN_CRYPT_PADDALGO a,
GWEN_BUFFER buf 
)
GWENHYWFAR_API int GWEN_Padd_UnpaddWithAnsiX9_23 ( GWEN_BUFFER src  ) 

This function is used to remove padding from plain text data after decrypting it.

Definition at line 239 of file padd.c.

References DBG_ERROR, GWEN_Buffer_Crop(), GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_Buffer_SetPos(), and GWEN_LOGDOMAIN.

Referenced by GWEN_CryptMgr_Decrypt(), and GWEN_Padd_UnapplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_UnpaddWithIso9796_2 ( GWEN_BUFFER buf  ) 

Definition at line 192 of file padd.c.

References DBG_ERROR, GWEN_Buffer_Crop(), GWEN_Buffer_GetStart(), GWEN_Buffer_GetUsedBytes(), GWEN_ERROR_BAD_DATA, GWEN_ERROR_INVALID, and GWEN_LOGDOMAIN.

Referenced by check2(), GWEN_CryptMgrKeys_DecryptKey(), GWEN_CryptMgrKeys_VerifyData(), and GWEN_Padd_UnapplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_UnpaddWithPkcs1Bt1 ( GWEN_BUFFER src  ) 

Definition at line 395 of file padd.c.

References GWEN_Padd__UnpaddWithPkcs1Bt1Or2().

Referenced by GWEN_Padd_UnapplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_UnpaddWithPkcs1Bt2 ( GWEN_BUFFER src  ) 

Definition at line 401 of file padd.c.

References GWEN_Padd__UnpaddWithPkcs1Bt1Or2().

Referenced by GWEN_Padd_UnapplyPaddAlgo().

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GWENHYWFAR_API int GWEN_Padd_VerifyPkcs1Pss ( const uint8_t *  pSrcBuffer,
uint32_t  lSrcBuffer,
uint32_t  nbits,
const uint8_t *  pHash,
uint32_t  lHash,
uint32_t  lSalt,
GWEN_MDIGEST md 
)

Definition at line 588 of file padd.c.

References DBG_ERROR, DBG_INFO, GWEN_ERROR_BAD_DATA, GWEN_ERROR_VERIFY, GWEN_LOGDOMAIN, GWEN_MDigest_Begin(), GWEN_MDigest_End(), GWEN_MDigest_GetDigestPtr(), GWEN_MDigest_GetDigestSize(), GWEN_MDigest_Update(), GWEN_Padd_MGF1(), and nullarray.

Referenced by GWEN_Crypt_TokenFile__Verify().

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Generated on Mon Jul 5 22:59:09 2010 for gwenhywfar by  doxygen 1.6.3