mirror of
https://github.com/cryb-to/cryb-to.git
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263 lines
7.6 KiB
C
263 lines
7.6 KiB
C
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/* R_ENCODE.C - RFC 1113 encoding and decoding routines
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*/
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/* Copyright (C) RSA Laboratories, a division of RSA Data Security,
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Inc., created 1991. All rights reserved.
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*/
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#include "global.h"
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#include "rsaref.h"
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/* RFC 1113 encoding:
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Value Encoding Value Encoding Value Encoding Value Encoding
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0 A 17 R 34 i 51 z
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1 B 18 S 35 j 52 0
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2 C 19 T 36 k 53 1
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3 D 20 U 37 l 54 2
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4 E 21 V 38 m 55 3
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5 F 22 W 39 n 56 4
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6 G 23 X 40 o 57 5
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7 H 24 Y 41 p 58 6
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8 I 25 Z 42 q 59 7
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9 J 26 a 43 r 60 8
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10 K 27 b 44 s 61 9
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11 L 28 c 45 t 62 +
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12 M 29 d 46 u 63 /
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13 N 30 e 47 v
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14 O 31 f 48 w (pad) =
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15 P 32 g 49 x
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16 Q 33 h 50 y
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*/
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#define ENCODING(i) \
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(unsigned char)(((i) < 26) ? ((i) + 0x41) : \
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(((i) < 52) ? ((i) - 26 + 0x61) : \
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(((i) < 62) ? ((i) - 52 + 0x30) : \
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(((i) == 62) ? 0x2b : 0x2f))))
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#define ENCODING_PAD 0x3d
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#define IS_ENCODING(c) \
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((((c) >= 0x41) && ((c) <= 0x5a)) || \
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(((c) >= 0x61) && ((c) <= 0x7a)) || \
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(((c) >= 0x30) && ((c) <= 0x39)) || \
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((c) == 0x2b) || \
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((c) == 0x2f))
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/* assumes IS_ENCODING (c) == 1 */
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#define DECODING(c) \
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(((c) == 0x2b) ? 62 : \
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(((c) == 0x2f) ? 63 : \
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(((c) <= 0x39) ? ((c) - 0x30 + 52) : \
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(((c) <= 0x5a) ? ((c) - 0x41) : ((c) - 0x61 + 26)))))
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static void EncodeQuantum PROTO_LIST ((unsigned char [4], unsigned char [3]));
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static int DecodeQuantum PROTO_LIST ((unsigned char [3], unsigned char [4]));
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static void EncodeLastQuantum
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PROTO_LIST ((unsigned char [4], unsigned char *, unsigned int));
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static int DecodeLastQuantum
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PROTO_LIST ((unsigned char *, unsigned int *, unsigned char [4]));
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/* This always returns 0. It is an int function for future compatibility.
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*/
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int R_EncodePEMBlock (encodedBlock, encodedBlockLen, block, blockLen)
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unsigned char *encodedBlock; /* encoded block */
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unsigned int *encodedBlockLen; /* length of encoded block */
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unsigned char *block; /* block */
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unsigned int blockLen; /* length of block */
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{
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unsigned int i, lastLen;
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if (blockLen < 1) {
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*encodedBlockLen = 0;
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return (0);
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}
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for (i = 0; i < (blockLen-1)/3; i++)
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EncodeQuantum (&encodedBlock[4*i], &block[3*i]);
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lastLen = blockLen - 3*i;
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EncodeLastQuantum (&encodedBlock[4*i], &block[3*i], lastLen);
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*encodedBlockLen = 4*i + 4;
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return (0);
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}
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int R_DecodePEMBlock (block, blockLen, encodedBlock, encodedBlockLen)
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unsigned char *block; /* block */
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unsigned int *blockLen; /* length of block */
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unsigned char *encodedBlock; /* encoded block */
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unsigned int encodedBlockLen; /* length of encoded block */
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{
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int status;
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unsigned int i, lastLen;
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if (encodedBlockLen % 4)
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return (RE_ENCODING);
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if (encodedBlockLen < 1) {
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*blockLen = 0;
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return (0);
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}
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for (i = 0; i < (encodedBlockLen-1)/4; i++)
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if ((status = DecodeQuantum (&block[3*i], &encodedBlock[4*i])))
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return (status);
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if ((status = DecodeLastQuantum (&block[3*i], &lastLen, &encodedBlock[4*i])))
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return (status);
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*blockLen = 3*i + lastLen;
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return (0);
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}
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static void EncodeQuantum (encodedQuantum, quantum)
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unsigned char encodedQuantum[4];
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unsigned char quantum[3];
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{
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UINT4 temp;
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unsigned int a, b, c, d;
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temp = ((UINT4)quantum[0]) << 16;
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temp |= ((UINT4)quantum[1]) << 8;
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temp |= (UINT4)quantum[2];
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a = (unsigned int)((temp >> 18) & 0x3f);
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b = (unsigned int)((temp >> 12) & 0x3f);
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c = (unsigned int)((temp >> 6) & 0x3f);
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d = (unsigned int)(temp & 0x3f);
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encodedQuantum[0] = ENCODING (a);
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encodedQuantum[1] = ENCODING (b);
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encodedQuantum[2] = ENCODING (c);
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encodedQuantum[3] = ENCODING (d);
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/* Zeroize potentially sensitive information.
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*/
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temp = 0;
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a = b = c = d = 0;
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}
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static int DecodeQuantum (quantum, encodedQuantum)
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unsigned char quantum[3];
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unsigned char encodedQuantum[4];
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{
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UINT4 temp;
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unsigned int a, b, c, d;
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if (! IS_ENCODING (encodedQuantum[0]) ||
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! IS_ENCODING (encodedQuantum[1]) ||
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! IS_ENCODING (encodedQuantum[2]) ||
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! IS_ENCODING (encodedQuantum[3]))
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return (RE_ENCODING);
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a = DECODING (encodedQuantum[0]);
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b = DECODING (encodedQuantum[1]);
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c = DECODING (encodedQuantum[2]);
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d = DECODING (encodedQuantum[3]);
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temp = ((UINT4)a) << 18;
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temp |= ((UINT4)b) << 12;
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temp |= ((UINT4)c) << 6;
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temp |= (UINT4)d;
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quantum[0] = (unsigned char)(temp >> 16);
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quantum[1] = (unsigned char)(temp >> 8);
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quantum[2] = (unsigned char)temp;
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/* Zeroize potentially sensitive information.
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*/
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temp = 0;
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a = b = c = d = 0;
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return (0);
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}
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static void EncodeLastQuantum (encodedQuantum, quantum, quantumLen)
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unsigned char encodedQuantum[4];
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unsigned char *quantum;
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unsigned int quantumLen; /* 1, 2 or 3 */
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{
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UINT4 temp;
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unsigned int a, b, c = 0, d = 0;
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temp = ((UINT4)quantum[0]) << 16;
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if (quantumLen >= 2)
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temp |= ((UINT4)quantum[1]) << 8;
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if (quantumLen == 3)
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temp |= ((UINT4)quantum[2]);
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a = (unsigned int)((temp >> 18) & 0x3f);
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b = (unsigned int)((temp >> 12) & 0x3f);
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if (quantumLen >= 2)
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c = (unsigned int)((temp >> 6) & 0x3f);
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if (quantumLen == 3)
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d = (unsigned int)(temp & 0x3f);
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encodedQuantum[0] = ENCODING (a);
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encodedQuantum[1] = ENCODING (b);
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if (quantumLen >= 2)
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encodedQuantum[2] = ENCODING (c);
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else
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encodedQuantum[2] = ENCODING_PAD;
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if (quantumLen == 3)
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encodedQuantum[3] = ENCODING (d);
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else
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encodedQuantum[3] = ENCODING_PAD;
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/* Zeroize potentially sensitive information.
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*/
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temp = 0;
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a = b = c = d = 0;
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}
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static int DecodeLastQuantum (quantum, quantumLen, encodedQuantum)
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unsigned char *quantum;
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unsigned int *quantumLen; /* 1, 2 or 3 */
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unsigned char encodedQuantum[4];
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{
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UINT4 temp;
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unsigned int a, b, c = 0, d = 0;
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if (! IS_ENCODING (encodedQuantum[0]) ||
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! IS_ENCODING (encodedQuantum[1]) ||
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(! IS_ENCODING (encodedQuantum[2]) &&
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(encodedQuantum[2] != ENCODING_PAD)) ||
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(! IS_ENCODING (encodedQuantum[3]) &&
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(encodedQuantum[3] != ENCODING_PAD)))
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return (RE_ENCODING);
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if (encodedQuantum[2] == ENCODING_PAD)
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*quantumLen = 1;
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else if (encodedQuantum[3] == ENCODING_PAD)
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*quantumLen = 2;
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else
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*quantumLen = 3;
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a = DECODING (encodedQuantum[0]);
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b = DECODING (encodedQuantum[1]);
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if (*quantumLen >= 2)
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c = DECODING (encodedQuantum[2]);
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if (*quantumLen == 3)
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d = DECODING (encodedQuantum[3]);
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temp = ((UINT4)a) << 18;
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temp |= ((UINT4)b) << 12;
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if (*quantumLen >= 2)
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temp |= ((UINT4)c) << 6;
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if (*quantumLen == 3)
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temp |= ((UINT4)d);
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quantum[0] = (unsigned char)(temp >> 16);
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if (*quantumLen >= 2)
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quantum[1] = (unsigned char)(temp >> 8);
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if (*quantumLen == 3)
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quantum[2] = (unsigned char)temp;
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/* Zeroize potentially sensitive information.
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*/
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temp = 0;
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a = b = c = d = 0;
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return (0);
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}
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