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lib: sha256: Add support for hardware specific sha256_process

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Mark sha256_process as weak to allow hardware specific implementation.
Add parameter for supporting multiple blocks processing.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
This commit is contained in:
Loic Poulain 2022-06-01 20:26:30 +02:00 committed by Tom Rini
parent 084d8e6bf9
commit 915047048f
1 changed files with 19 additions and 7 deletions
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26
lib/sha256.c
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@ -14,6 +14,8 @@
#include <watchdog.h>
#include <u-boot/sha256.h>
#include <linux/compiler_attributes.h>
const uint8_t sha256_der_prefix[SHA256_DER_LEN] = {
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
@ -55,7 +57,7 @@ void sha256_starts(sha256_context * ctx)
ctx->state[7] = 0x5BE0CD19;
}
static void sha256_process(sha256_context *ctx, const uint8_t data[64])
static void sha256_process_one(sha256_context *ctx, const uint8_t data[64])
{
uint32_t temp1, temp2;
uint32_t W[64];
@ -186,6 +188,18 @@ static void sha256_process(sha256_context *ctx, const uint8_t data[64])
ctx->state[7] += H;
}
__weak void sha256_process(sha256_context *ctx, const unsigned char *data,
unsigned int blocks)
{
if (!blocks)
return;
while (blocks--) {
sha256_process_one(ctx, data);
data += 64;
}
}
void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
{
uint32_t left, fill;
@ -204,17 +218,15 @@ void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
if (left && length >= fill) {
memcpy((void *) (ctx->buffer + left), (void *) input, fill);
sha256_process(ctx, ctx->buffer);
sha256_process(ctx, ctx->buffer, 1);
length -= fill;
input += fill;
left = 0;
}
while (length >= 64) {
sha256_process(ctx, input);
length -= 64;
input += 64;
}
sha256_process(ctx, input, length / 64);
input += length / 64 * 64;
length = length % 64;
if (length)
memcpy((void *) (ctx->buffer + left), (void *) input, length);