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decrease RAM usage using PROGMEM

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This commit is contained in:
AndreiD
2017-02-19 14:53:17 +02:00
committed by Ivan Grokhotkov
parent 8afe55267a
commit feed1ca219
9 changed files with 103 additions and 35 deletions
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11
crypto/sha256.c
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@@ -48,7 +48,7 @@
(b)[(i) + 3] = (uint8_t) ((n) ); \
}
static const uint8_t sha256_padding[64] =
static const uint8_t sha256_padding[64] PROGMEM =
{
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -249,6 +249,10 @@ void SHA256_Final(uint8_t *digest, SHA256_CTX *ctx)
uint32_t last, padn;
uint32_t high, low;
uint8_t msglen[8];
#ifdef WITH_PGM_READ_HELPER
uint8_t sha256_padding_ram[64];
memcpy(sha256_padding_ram, sha256_padding, 64);
#endif
high = (ctx->total[0] >> 29)
| (ctx->total[1] << 3);
@@ -259,8 +263,11 @@ void SHA256_Final(uint8_t *digest, SHA256_CTX *ctx)
last = ctx->total[0] & 0x3F;
padn = (last < 56) ? (56 - last) : (120 - last);
#ifdef WITH_PGM_READ_HELPER
SHA256_Update(ctx, sha256_padding_ram, padn);
#else
SHA256_Update(ctx, sha256_padding, padn);
#endif
SHA256_Update(ctx, msglen, 8);
PUT_UINT32(ctx->state[0], digest, 0);