--- pgp/rsaref/source/desc.c 2018/04/24 16:40:41 1.1 +++ pgp/rsaref/source/desc.c 2018/04/24 16:41:41 1.1.1.2 @@ -1,645 +1,320 @@ -/* DESC.C - Data Encryption Standard routines for RSAREF - Based on "Karn/Hoey/Outerbridge" implementation (KHODES) - */ - -#include "global.h" -#include "rsaref.h" -#include "des.h" - -static UINT2 BYTE_BIT[8] = { - 0200, 0100, 040, 020, 010, 04, 02, 01 -}; - -static UINT4 BIG_BYTE[24] = { - 0x800000L, 0x400000L, 0x200000L, 0x100000L, - 0x80000L, 0x40000L, 0x20000L, 0x10000L, - 0x8000L, 0x4000L, 0x2000L, 0x1000L, - 0x800L, 0x400L, 0x200L, 0x100L, - 0x80L, 0x40L, 0x20L, 0x10L, - 0x8L, 0x4L, 0x2L, 0x1L -}; - -static unsigned char PC1[56] = { - 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, - 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, - 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, - 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 -}; - -static unsigned char TOTAL_ROTATIONS[16] = { - 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 -}; - -static unsigned char PC2[48] = { - 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, - 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, - 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, - 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 -}; - -static UINT4 SP1[64] = { - 0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L, - 0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L, - 0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L, - 0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L, - 0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L, - 0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L, - 0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L, - 0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L, - 0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L, - 0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L, - 0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L, - 0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L, - 0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L, - 0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L, - 0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L, - 0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L -}; - -static UINT4 SP2[64] = { - 0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L, - 0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L, - 0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L, - 0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L, - 0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L, - 0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L, - 0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L, - 0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L, - 0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L, - 0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L, - 0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L, - 0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L, - 0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L, - 0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L, - 0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L, - 0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L -}; - -static UINT4 SP3[64] = { - 0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L, - 0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L, - 0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L, - 0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L, - 0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L, - 0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L, - 0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L, - 0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L, - 0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L, - 0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L, - 0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L, - 0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L, - 0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L, - 0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L, - 0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L, - 0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L -}; - -static UINT4 SP4[64] = { - 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, - 0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L, - 0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L, - 0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L, - 0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L, - 0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L, - 0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L, - 0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L, - 0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L, - 0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L, - 0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L, - 0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, - 0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L, - 0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L, - 0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L, - 0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L -}; - -static UINT4 SP5[64] = { - 0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L, - 0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L, - 0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L, - 0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L, - 0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L, - 0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L, - 0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L, - 0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L, - 0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L, - 0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L, - 0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L, - 0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L, - 0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L, - 0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L, - 0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L, - 0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L -}; - -static UINT4 SP6[64] = { - 0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L, - 0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L, - 0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L, - 0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L, - 0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L, - 0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L, - 0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L, - 0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L, - 0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L, - 0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L, - 0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L, - 0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L, - 0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L, - 0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L, - 0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L, - 0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L -}; - -static UINT4 SP7[64] = { - 0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L, - 0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L, - 0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L, - 0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L, - 0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L, - 0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L, - 0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L, - 0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L, - 0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L, - 0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L, - 0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L, - 0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L, - 0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L, - 0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L, - 0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L, - 0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L -}; - -static UINT4 SP8[64] = { - 0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L, - 0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L, - 0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L, - 0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L, - 0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L, - 0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L, - 0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L, - 0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L, - 0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L, - 0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L, - 0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L, - 0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L, - 0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L, - 0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L, - 0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L, - 0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L -}; - -static void Unpack PROTO_LIST ((unsigned char *, UINT4 *)); -static void Pack PROTO_LIST ((UINT4 *, unsigned char *)); -static void DESKey PROTO_LIST ((UINT4 *, unsigned char *, int)); -static void CookKey PROTO_LIST ((UINT4 *, UINT4 *, int)); -static void DESFunction PROTO_LIST ((UINT4 *, UINT4 *)); - -/* Initialize context. Caller must zeroize the context when finished. - */ -void DES_CBCInit (context, key, iv, encrypt) -DES_CBC_CTX *context; /* context */ -unsigned char key[8]; /* key */ -unsigned char iv[8]; /* initializing vector */ -int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ -{ - /* Copy encrypt flag to context. - */ - context->encrypt = encrypt; - - /* Pack initializing vector into context. - */ - Pack (context->iv, iv); - - /* Save the IV for use in Restart */ - context->originalIV[0] = context->iv[0]; - context->originalIV[1] = context->iv[1]; - - /* Precompute key schedule - */ - DESKey (context->subkeys, key, encrypt); -} - -/* DES-CBC block update operation. Continues a DES-CBC encryption - operation, processing eight-byte message blocks, and updating - the context. - */ -int DES_CBCUpdate (context, output, input, len) -DES_CBC_CTX *context; /* context */ -unsigned char *output; /* output block */ -unsigned char *input; /* input block */ -unsigned int len; /* length of input and output blocks */ -{ - UINT4 inputBlock[2], work[2]; - unsigned int i; - - if (len % 8) - return (RE_LEN); - - for (i = 0; i < len/8; i++) { - Pack (inputBlock, &input[8*i]); - - /* Chain if encrypting. - */ - if (context->encrypt) { - work[0] = inputBlock[0] ^ context->iv[0]; - work[1] = inputBlock[1] ^ context->iv[1]; - } - else { - work[0] = inputBlock[0]; - work[1] = inputBlock[1]; - } - - DESFunction (work, context->subkeys); - - /* Chain if decrypting, then update IV. - */ - if (context->encrypt) { - context->iv[0] = work[0]; - context->iv[1] = work[1]; - } - else { - work[0] ^= context->iv[0]; - work[1] ^= context->iv[1]; - context->iv[0] = inputBlock[0]; - context->iv[1] = inputBlock[1]; - } - Unpack (&output[8*i], work); - } - - /* Zeroize sensitive information. - */ - R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); - R_memset ((POINTER)work, 0, sizeof (work)); - - return (0); -} - -void DES_CBCRestart (context) -DES_CBC_CTX *context; -{ - /* Reset to the original IV */ - context->iv[0] = context->originalIV[0]; - context->iv[1] = context->originalIV[1]; -} - -/* Initialize context. Caller must zeroize the context when finished. - The key has the DES key, input whitener and output whitener concatenated. - */ -void DESX_CBCInit (context, key, iv, encrypt) -DESX_CBC_CTX *context; -unsigned char key[24]; /* DES key and whiteners */ -unsigned char iv[8]; /* DES initializing vector */ -int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ -{ - /* Copy encrypt flag to context. - */ - context->encrypt = encrypt; - - /* Pack initializing vector and whiteners into context. - */ - Pack (context->iv, iv); - Pack (context->inputWhitener, key + 8); - Pack (context->outputWhitener, key + 16); - - /* Save the IV for use in Restart */ - context->originalIV[0] = context->iv[0]; - context->originalIV[1] = context->iv[1]; - - /* Precompute key schedule. - */ - DESKey (context->subkeys, key, encrypt); -} - -/* DESX-CBC block update operation. Continues a DESX-CBC encryption - operation, processing eight-byte message blocks, and updating - the context. - */ -int DESX_CBCUpdate (context, output, input, len) -DESX_CBC_CTX *context; /* context */ -unsigned char *output; /* output block */ -unsigned char *input; /* input block */ -unsigned int len; /* length of input and output blocks */ -{ - UINT4 inputBlock[2], work[2]; - unsigned int i; - - if (len % 8) - return (RE_LEN); - - for (i = 0; i < len/8; i++) { - Pack (inputBlock, &input[8*i]); - - /* Chain if encrypting, and xor with whitener. - */ - if (context->encrypt) { - work[0] = - inputBlock[0] ^ context->iv[0] ^ context->inputWhitener[0]; - work[1] = - inputBlock[1] ^ context->iv[1] ^ context->inputWhitener[1]; - } - else { - work[0] = inputBlock[0] ^ context->outputWhitener[0]; - work[1] = inputBlock[1] ^ context->outputWhitener[1]; - } - - DESFunction (work, context->subkeys); - - /* Xor with whitener, chain if decrypting, then update IV. - */ - if (context->encrypt) { - work[0] ^= context->outputWhitener[0]; - work[1] ^= context->outputWhitener[1]; - context->iv[0] = work[0]; - context->iv[1] = work[1]; - } - else { - work[0] ^= context->iv[0] ^ context->inputWhitener[0]; - work[1] ^= context->iv[1] ^ context->inputWhitener[1]; - context->iv[0] = inputBlock[0]; - context->iv[1] = inputBlock[1]; - } - Unpack (&output[8*i], work); - } - - /* Zeroize sensitive information. - */ - R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); - R_memset ((POINTER)work, 0, sizeof (work)); - - return (0); -} - -void DESX_CBCRestart (context) -DESX_CBC_CTX *context; -{ - /* Reset to the original IV */ - context->iv[0] = context->originalIV[0]; - context->iv[1] = context->originalIV[1]; -} - -/* Initialize context. Caller must zeroize the context when finished. - */ -void DES3_CBCInit(context, key, iv, encrypt) -DES3_CBC_CTX *context; /* context */ -unsigned char key[24]; /* key */ -unsigned char iv[8]; /* initializing vector */ -int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ -{ - /* Copy encrypt flag to context. - */ - context->encrypt = encrypt; - - /* Pack initializing vector into context. - */ - Pack (context->iv, iv); - - /* Save the IV for use in Restart */ - context->originalIV[0] = context->iv[0]; - context->originalIV[1] = context->iv[1]; - - /* Precompute key schedules. - */ - DESKey (context->subkeys[0], encrypt ? key : &key[16], encrypt); - DESKey (context->subkeys[1], &key[8], !encrypt); - DESKey (context->subkeys[2], encrypt ? &key[16] : key, encrypt); -} - -int DES3_CBCUpdate (context, output, input, len) -DES3_CBC_CTX *context; /* context */ -unsigned char *output; /* output block */ -unsigned char *input; /* input block */ -unsigned int len; /* length of input and output blocks */ -{ - UINT4 inputBlock[2], work[2]; - unsigned int i; - - if (len % 8) - return (RE_LEN); - - for (i = 0; i < len/8; i++) { - Pack (inputBlock, &input[8*i]); - - /* Chain if encrypting. - */ - if (context->encrypt) { - work[0] = inputBlock[0] ^ context->iv[0]; - work[1] = inputBlock[1] ^ context->iv[1]; - } - else { - work[0] = inputBlock[0]; - work[1] = inputBlock[1]; - } - - DESFunction (work, context->subkeys[0]); - DESFunction (work, context->subkeys[1]); - DESFunction (work, context->subkeys[2]); - - /* Chain if decrypting, then update IV. - */ - if (context->encrypt) { - context->iv[0] = work[0]; - context->iv[1] = work[1]; - } - else { - work[0] ^= context->iv[0]; - work[1] ^= context->iv[1]; - context->iv[0] = inputBlock[0]; - context->iv[1] = inputBlock[1]; - } - Unpack (&output[8*i], work); - } - - /* Zeroize sensitive information. - */ - R_memset ((POINTER)inputBlock, 0, sizeof (inputBlock)); - R_memset ((POINTER)work, 0, sizeof (work)); - - return (0); -} - -void DES3_CBCRestart (context) -DES3_CBC_CTX *context; -{ - /* Reset to the original IV */ - context->iv[0] = context->originalIV[0]; - context->iv[1] = context->originalIV[1]; -} - -static void Pack (into, outof) -UINT4 *into; -unsigned char *outof; -{ - *into = (*outof++ & 0xffL) << 24; - *into |= (*outof++ & 0xffL) << 16; - *into |= (*outof++ & 0xffL) << 8; - *into++ |= (*outof++ & 0xffL); - *into = (*outof++ & 0xffL) << 24; - *into |= (*outof++ & 0xffL) << 16; - *into |= (*outof++ & 0xffL) << 8; - *into |= (*outof & 0xffL); -} - -static void Unpack (into, outof) -unsigned char *into; -UINT4 *outof; -{ - *into++ = (unsigned char)((*outof >> 24) & 0xffL); - *into++ = (unsigned char)((*outof >> 16) & 0xffL); - *into++ = (unsigned char)((*outof >> 8) & 0xffL); - *into++ = (unsigned char)( *outof++ & 0xffL); - *into++ = (unsigned char)((*outof >> 24) & 0xffL); - *into++ = (unsigned char)((*outof >> 16) & 0xffL); - *into++ = (unsigned char)((*outof >> 8) & 0xffL); - *into = (unsigned char)( *outof & 0xffL); -} - -static void DESKey (subkeys, key, encrypt) -UINT4 subkeys[32]; -unsigned char key[8]; -int encrypt; -{ - UINT4 kn[32]; - int i, j, l, m, n; - unsigned char pc1m[56], pcr[56]; - - for (j = 0; j < 56; j++) { - l = PC1[j]; - m = l & 07; - pc1m[j] = (unsigned char)((key[l >> 3] & BYTE_BIT[m]) ? 1 : 0); - } - for (i = 0; i < 16; i++) { - m = i << 1; - n = m + 1; - kn[m] = kn[n] = 0L; - for (j = 0; j < 28; j++) { - l = j + TOTAL_ROTATIONS[i]; - if (l < 28) - pcr[j] = pc1m[l]; - else - pcr[j] = pc1m[l - 28]; - } - for (j = 28; j < 56; j++) { - l = j + TOTAL_ROTATIONS[i]; - if (l < 56) - pcr[j] = pc1m[l]; - else - pcr[j] = pc1m[l - 28]; - } - for (j = 0; j < 24; j++) { - if (pcr[PC2[j]]) - kn[m] |= BIG_BYTE[j]; - if (pcr[PC2[j+24]]) - kn[n] |= BIG_BYTE[j]; - } - } - CookKey (subkeys, kn, encrypt); - - /* Zeroize sensitive information. - */ - R_memset ((POINTER)pc1m, 0, sizeof (pc1m)); - R_memset ((POINTER)pcr, 0, sizeof (pcr)); - R_memset ((POINTER)kn, 0, sizeof (kn)); -} - -static void CookKey (subkeys, kn, encrypt) -UINT4 *subkeys; -UINT4 *kn; -int encrypt; -{ - UINT4 *cooked, *raw0, *raw1; - int increment; - unsigned int i; - - raw1 = kn; - cooked = encrypt ? subkeys : &subkeys[30]; - increment = encrypt ? 1 : -3; - - for (i = 0; i < 16; i++, raw1++) { - raw0 = raw1++; - *cooked = (*raw0 & 0x00fc0000L) << 6; - *cooked |= (*raw0 & 0x00000fc0L) << 10; - *cooked |= (*raw1 & 0x00fc0000L) >> 10; - *cooked++ |= (*raw1 & 0x00000fc0L) >> 6; - *cooked = (*raw0 & 0x0003f000L) << 12; - *cooked |= (*raw0 & 0x0000003fL) << 16; - *cooked |= (*raw1 & 0x0003f000L) >> 4; - *cooked |= (*raw1 & 0x0000003fL); - cooked += increment; - } -} - -static void DESFunction (block, subkeys) -UINT4 *block; -UINT4 *subkeys; -{ - register UINT4 fval, work, right, left; - register int round; - - left = block[0]; - right = block[1]; - work = ((left >> 4) ^ right) & 0x0f0f0f0fL; - right ^= work; - left ^= (work << 4); - work = ((left >> 16) ^ right) & 0x0000ffffL; - right ^= work; - left ^= (work << 16); - work = ((right >> 2) ^ left) & 0x33333333L; - left ^= work; - right ^= (work << 2); - work = ((right >> 8) ^ left) & 0x00ff00ffL; - left ^= work; - right ^= (work << 8); - right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL; - work = (left ^ right) & 0xaaaaaaaaL; - left ^= work; - right ^= work; - left = ((left << 1) | ((left >> 31) & 1L)) & 0xffffffffL; - - for (round = 0; round < 8; round++) { - work = (right << 28) | (right >> 4); - work ^= *subkeys++; - fval = SP7[ work & 0x3fL]; - fval |= SP5[(work >> 8) & 0x3fL]; - fval |= SP3[(work >> 16) & 0x3fL]; - fval |= SP1[(work >> 24) & 0x3fL]; - work = right ^ *subkeys++; - fval |= SP8[ work & 0x3fL]; - fval |= SP6[(work >> 8) & 0x3fL]; - fval |= SP4[(work >> 16) & 0x3fL]; - fval |= SP2[(work >> 24) & 0x3fL]; - left ^= fval; - work = (left << 28) | (left >> 4); - work ^= *subkeys++; - fval = SP7[ work & 0x3fL]; - fval |= SP5[(work >> 8) & 0x3fL]; - fval |= SP3[(work >> 16) & 0x3fL]; - fval |= SP1[(work >> 24) & 0x3fL]; - work = left ^ *subkeys++; - fval |= SP8[ work & 0x3fL]; - fval |= SP6[(work >> 8) & 0x3fL]; - fval |= SP4[(work >> 16) & 0x3fL]; - fval |= SP2[(work >> 24) & 0x3fL]; - right ^= fval; - } - - right = (right << 31) | (right >> 1); - work = (left ^ right) & 0xaaaaaaaaL; - left ^= work; - right ^= work; - left = (left << 31) | (left >> 1); - work = ((left >> 8) ^ right) & 0x00ff00ffL; - right ^= work; - left ^= (work << 8); - work = ((left >> 2) ^ right) & 0x33333333L; - right ^= work; - left ^= (work << 2); - work = ((right >> 16) ^ left) & 0x0000ffffL; - left ^= work; - right ^= (work << 16); - work = ((right >> 4) ^ left) & 0x0f0f0f0fL; - left ^= work; - right ^= (work << 4); - *block++ = right; - *block = left; -} +/* DESC.C - Data Encryption Standard routines for RSAREF + */ + +#include "global.h" +#include "rsaref.h" +#include "des.h" + +/* Initial permutation IP. + */ +unsigned char IP[64] = { + 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, + 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, + 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, + 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 +}; + +/* Final permutation FP = IP^{-1}. + */ +unsigned char FP[64] = { + 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, + 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, + 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, + 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25 +}; + +/* Permuted-choice 1. + */ +unsigned char PC1[] = { + 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, + 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, + 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, + 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 +}; + +/* Left shifts for the key schedule. + */ +unsigned char LS[16] = { + 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 +}; + +/* Permuted-choice 2. + */ +unsigned char PC2[] = { + 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, + 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, + 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, + 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 +}; + +/* Bit-selection table E. + */ +unsigned char E[] = { + 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, + 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, + 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, + 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 +}; + +/* Selection functions (S-boxes). [[These are 0-origin indexed.]] + */ +unsigned char S[8][64] = { + 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, + 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, + 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, + 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13, + + 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, + 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, + 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, + 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9, + + 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, + 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, + 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, + 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12, + + 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, + 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, + 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, + 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14, + + 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, + 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, + 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, + 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3, + + 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, + 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, + 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, + 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13, + + 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, + 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, + 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, + 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12, + + 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, + 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, + 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, + 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 +}; + +/* Permutation P. + */ +unsigned char P[32] = { + 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, + 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 +}; + +static void Unpack PROTO_LIST + ((unsigned char *, unsigned char *, unsigned int)); +static void Pack PROTO_LIST + ((unsigned char *, unsigned char *, unsigned int)); + +/* DES-CBC initialization. Begins a DES-CBC operation, writing a new + context. + */ +void DES_CBCInit (context, key, iv, encrypt) +DES_CBC_CTX *context; /* DES-CBC context */ +unsigned char key[8]; /* DES key */ +unsigned char iv[8]; /* DES initializing vector */ +int encrypt; /* encrypt flag (1 = encrypt, 0 = decrypt) */ +{ + unsigned char CD[56], keyBit[64], t; + unsigned int i, j; + + /* Copy encrypt flag to context. + */ + context->encrypt = encrypt; + + /* Unpack initializing vector into context. + */ + Unpack (context->ivBit, iv, 8); + + /* Unpack key and generate C and D by permuting the key according to PC1. + */ + Unpack (keyBit, key, 8); + for (i = 0; i < 56; i++) + CD[i] = keyBit[PC1[i]-1]; + + /* Generate subkeys Ki by rotating C and D according to schedule and + permuting C and D according to PC2. + */ + for (i = 0; i < 16; i++) { + for (j = 0; j < LS[i]; j++) { + t = CD[0]; + R_memcpy ((POINTER)CD, (POINTER)&CD[1], 27); + CD[27] = t; + t = CD[28]; + R_memcpy ((POINTER)&CD[28], (POINTER)&CD[29], 27); + CD[55] = t; + } + + for (j = 0; j < 48; j++) + context->subkeyBit[i][j] = CD[PC2[j]-1]; + } + + /* Zeroize sensitive information. + */ + R_memset ((POINTER)CD, 0, sizeof (CD)); + R_memset ((POINTER)keyBit, 0, sizeof (keyBit)); +} + +/* DES-CBC block update operation. Continues a DES-CBC encryption + operation, processing eight-byte message blocks, and updating + the context. + */ +int DES_CBCUpdate (context, output, input, len) +DES_CBC_CTX *context; /* DES-CBC context */ +unsigned char *output; /* output block */ +unsigned char *input; /* input block */ +unsigned int len; /* length of input and output blocks */ +{ + unsigned char inputBit[64], LR[64], newL[32], outputBit[64], sInput[48], + sOutput[32], t; + unsigned int i, j, k; + + if (len % 8) + return (RE_LEN); + + for (i = 0; i < len/8; i++) { + + /* Unpack input block and set LR = IP(input ^ iv) (encrypt) or + LR = IP(input) (decrypt). + */ + Unpack (inputBit, &input[8*i], 8); + + if (context->encrypt) + for (j = 0; j < 64; j++) + LR[j] = inputBit[IP[j]-1] ^ context->ivBit[IP[j]-1]; + else + for (j = 0; j < 64; j++) + LR[j] = inputBit[IP[j]-1]; + + /* 16 rounds. + */ + for (j = 0; j < 16; j++) { + + /* Save R, which will be the new L. + */ + R_memcpy ((POINTER)newL, &LR[32], 32); + + /* Compute sInput = E(R) ^ Kj (encrypt) or sInput = E(R) ^ K{15-j} + (decrypt). + */ + if (context->encrypt) + for (k = 0; k < 48; k++) + sInput[k] = LR[E[k]+31] ^ context->subkeyBit[j][k]; + else + for (k = 0; k < 48; k++) + sInput[k] = LR[E[k]+31] ^ context->subkeyBit[15-j][k]; + + /* Apply eight S boxes. Index into S box k is formed from these + bits of sInput: + + 6*k 6*k+5 6*k+1 6*k+2 6*k+3 6*k+4 + + Value of S box k becomes these bits of sOutput: + + 4*k 4*k+1 4*k+2 4*k+3 + */ + for (k = 0; k < 8; k++) { + t = S[k][(sInput[6*k] << 5) | (sInput[6*k + 5] << 4) | + (sInput[6*k + 1] << 3) | (sInput[6*k + 2] << 2) | + (sInput[6*k + 3] << 1) | (sInput[6*k + 4] << 0)]; + + sOutput[4*k] = (unsigned char)((t >> 3) & 1); + sOutput[4*k + 1] = (unsigned char)((t >> 2) & 1); + sOutput[4*k + 2] = (unsigned char)((t >> 1) & 1); + sOutput[4*k + 3] = (unsigned char)(t & 1); + } + + /* Compute new R = L ^ P(sOutput). + */ + for (k = 0; k < 32; k++) + LR[k+32] = LR[k] ^ sOutput[P[k]-1]; + + /* Restore new L. + */ + R_memcpy ((POINTER)LR, (POINTER)newL, 32); + } + + /* Exchange L and R. + */ + R_memcpy ((POINTER)newL, (POINTER)&LR[32], 32); + R_memcpy ((POINTER)&LR[32], (POINTER)LR, 32); + R_memcpy ((POINTER)LR, (POINTER)newL, 32); + + /* Set output = FP(LR) (encrypt) or FP(LR) ^ iv (decrypt), and pack + output block. + */ + if (context->encrypt) + for (j = 0; j < 64; j++) + outputBit[j] = LR[FP[j]-1]; + else + for (j = 0; j < 64; j++) + outputBit[j] = LR[FP[j]-1] ^ context->ivBit[j]; + + Pack (&output[8*i], outputBit, 8); + + /* Set iv = output (encrypt) or iv = input (decrypt). + */ + if (context->encrypt) + R_memcpy ((POINTER)context->ivBit, (POINTER)outputBit, 64); + else + R_memcpy ((POINTER)context->ivBit, (POINTER)inputBit, 64); + } + + /* Zeroize sensitive information. + */ + R_memset ((POINTER)inputBit, 0, sizeof (inputBit)); + R_memset ((POINTER)LR, 0, sizeof (LR)); + R_memset ((POINTER)newL, 0, sizeof (newL)); + R_memset ((POINTER)outputBit, 0, sizeof (outputBit)); + R_memset ((POINTER)sInput, 0, sizeof (sInput)); + R_memset ((POINTER)sOutput, 0, sizeof (sOutput)); + t = 0; + + return (0); +} + +/* DES-CBC finalization operation. Ends a DES-CBC encryption operation, + zeroizing the context. + */ +void DES_CBCFinal (context) +DES_CBC_CTX *context; +{ + R_memset ((POINTER)context, 0, sizeof (*context)); +} + +static void Unpack (bit, block, blockLen) +unsigned char *bit; /* bit array */ +unsigned char *block; /* byte array */ +unsigned int blockLen; /* length of byte array */ +{ + unsigned int i, j; + unsigned char t; + + for (i = 0; i < blockLen; i++) { + t = block[i]; + for (j = 0; j < 8; j++) + bit[8*i + j] = (unsigned char)((t >> (7-j)) & 1); + } +} + +static void Pack (block, bit, blockLen) +unsigned char *block; /* byte array */ +unsigned char *bit; /* bit array */ +unsigned int blockLen; /* length of byte array */ +{ + unsigned int i, j; + unsigned char t; + + for (i = 0; i < blockLen; i++) { + t = 0; + for (j = 0; j < 8; j++) + t |= bit[8*i +j] << (7-j); + block[i] = t; + } +}