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111 lines
3 KiB
C
111 lines
3 KiB
C
/* R_RANDOM.C - random objects for RSAREF
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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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#include "r_random.h"
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#include "md5.h"
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#define RANDOM_BYTES_NEEDED 256
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int R_RandomInit (randomStruct)
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R_RANDOM_STRUCT *randomStruct; /* new random structure */
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{
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randomStruct->bytesNeeded = RANDOM_BYTES_NEEDED;
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R_memset ((POINTER)randomStruct->state, 0, sizeof (randomStruct->state));
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randomStruct->outputAvailable = 0;
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return (0);
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}
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int R_RandomUpdate (randomStruct, block, blockLen)
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R_RANDOM_STRUCT *randomStruct; /* random structure */
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unsigned char *block; /* block of values to mix in */
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unsigned int blockLen; /* length of block */
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{
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MD5_CTX context;
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unsigned char digest[16];
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unsigned int i, x;
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MD5Init (&context);
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MD5Update (&context, block, blockLen);
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MD5Final (digest, &context);
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/* add digest to state */
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x = 0;
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for (i = 0; i < 16; i++) {
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x += randomStruct->state[15-i] + digest[15-i];
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randomStruct->state[15-i] = (unsigned char)x;
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x >>= 8;
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}
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if (randomStruct->bytesNeeded < blockLen)
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randomStruct->bytesNeeded = 0;
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else
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randomStruct->bytesNeeded -= blockLen;
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/* Zeroize sensitive information.
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*/
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R_memset ((POINTER)digest, 0, sizeof (digest));
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x = 0;
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return (0);
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}
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int R_GetRandomBytesNeeded (bytesNeeded, randomStruct)
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unsigned int *bytesNeeded; /* number of mix-in bytes needed */
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R_RANDOM_STRUCT *randomStruct; /* random structure */
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{
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*bytesNeeded = randomStruct->bytesNeeded;
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return (0);
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}
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int R_GenerateBytes (block, blockLen, randomStruct)
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unsigned char *block; /* block */
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unsigned int blockLen; /* length of block */
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R_RANDOM_STRUCT *randomStruct; /* random structure */
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{
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MD5_CTX context;
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unsigned int available, i;
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if (randomStruct->bytesNeeded)
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return (RE_NEED_RANDOM);
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available = randomStruct->outputAvailable;
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while (blockLen > available) {
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R_memcpy
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((POINTER)block, (POINTER)&randomStruct->output[16-available],
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available);
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block += available;
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blockLen -= available;
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/* generate new output */
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MD5Init (&context);
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MD5Update (&context, randomStruct->state, 16);
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MD5Final (randomStruct->output, &context);
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available = 16;
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/* increment state */
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for (i = 0; i < 16; i++)
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if (randomStruct->state[15-i]++)
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break;
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}
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R_memcpy
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((POINTER)block, (POINTER)&randomStruct->output[16-available], blockLen);
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randomStruct->outputAvailable = available - blockLen;
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return (0);
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}
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void R_RandomFinal (randomStruct)
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R_RANDOM_STRUCT *randomStruct; /* random structure */
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{
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R_memset ((POINTER)randomStruct, 0, sizeof (*randomStruct));
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}
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