salfter/infnoise
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Reworked the readData() to get closer to processBytes()

Browse Source
This commit is contained in:
Patrick Siegl
2020-04-15 20:23:03 +02:00
parent 0561fba738
commit ba0f6de777
1 changed files with 28 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
software/libinfnoise.c
View File

@@ -353,24 +353,9 @@ uint32_t processBytes(uint8_t *bytes, uint8_t *result, uint32_t *entropy,
uint32_t readData(struct infnoise_context *context, uint8_t *result, bool raw, uint32_t outputMultiplier) {
// check if data can be squeezed from the keccak sponge from previous state (or we need to collect some new entropy to get bytesGiven >0)
if (context->keccakBytesGiven > 0u) {
// squeeze the sponge!
// Output up to 1024 bits at a time.
uint32_t bytesToWrite = 1024u / 8u;
if (bytesToWrite > context->keccakBytesGiven) {
bytesToWrite = context->keccakBytesGiven;
}
KeccakExtract(keccakState, result, bytesToWrite / 8u);
KeccakPermutation(keccakState);
context->keccakBytesGiven -= bytesToWrite;
return bytesToWrite;
} else { // collect new entropy
if (context->keccakBytesGiven == 0u) { // collect new entropy (e.g. case RAW)
uint8_t inBuf[BUFLEN];
struct timespec start;
struct timespec start, end;
clock_gettime(CLOCK_REALTIME, &start);
// write clock signal
@@ -386,23 +371,35 @@ uint32_t readData(struct infnoise_context *context, uint8_t *result, bool raw, u
return 0;
}
struct timespec end;
clock_gettime(CLOCK_REALTIME, &end);
uint32_t us = diffTime(&start, &end);
if (diffTime(&start, &end) > MAX_MICROSEC_FOR_SAMPLES)
return 0;
if (us <= MAX_MICROSEC_FOR_SAMPLES) {
uint8_t bytes[BUFLEN / 8u];
context->entropyThisTime = extractBytes(bytes, sizeof(bytes), inBuf, &context->message, &context->errorFlag);
if (context->errorFlag) {
// todo: message?
return 0;
}
// call health check and return bytes if OK
if (inmHealthCheckOkToUseData() && inmEntropyOnTarget(context->entropyThisTime, BUFLEN)) {
return processBytes(bytes, result, &context->entropyThisTime, &context->keccakBytesGiven,
raw, outputMultiplier);
}
uint8_t bytes[BUFLEN / 8u];
context->entropyThisTime = extractBytes(bytes, sizeof(bytes), inBuf, &context->message, &context->errorFlag);
if (context->errorFlag
|| ! (inmHealthCheckOkToUseData()
&& inmEntropyOnTarget(context->entropyThisTime, BUFLEN)) ) {
// todo: message?
return 0;
}
// called health check are ok and return bytes
return processBytes(bytes, result, &context->entropyThisTime, &context->keccakBytesGiven, raw, outputMultiplier);
} else { // squeeze the sponge!
// Output up to 1024 bits at a time.
uint32_t bytesToWrite = 1024u / 8u;
if (bytesToWrite > context->keccakBytesGiven) {
bytesToWrite = context->keccakBytesGiven;
}
KeccakExtract(keccakState, result, bytesToWrite / 8u);
KeccakPermutation(keccakState);
context->keccakBytesGiven -= bytesToWrite;
return bytesToWrite;
}
return 0;
}