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Further tuning of the zero trim / is leading set logic for new ECC signature encoding/decoding API's.

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This commit is contained in:
David Garske
2020-10-29 15:59:51 -07:00
parent 95c8a48285
commit e4f3f8b80a
1 changed files with 4 additions and 7 deletions
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11
wolfcrypt/src/asn.c
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@@ -15430,13 +15430,9 @@ int StoreECC_DSA_Sig(byte* out, word32* outLen, mp_int* r, mp_int* s)
/* determine if leading bit is set */ /* determine if leading bit is set */
static int is_leading_bit_set(const byte* input, word32 sz) static int is_leading_bit_set(const byte* input, word32 sz)
{ {
int i;
byte c = 0; byte c = 0;
for (i=0; i<(int)sz; i++) { if (sz > 0)
c = input[i]; c = input[0];
if (c != 0)
break;
}
return (c & 0x80) != 0; return (c & 0x80) != 0;
} }
static int trim_leading_zeros(const byte** input, word32 sz) static int trim_leading_zeros(const byte** input, word32 sz)
@@ -15458,6 +15454,7 @@ static int trim_leading_zeros(const byte** input, word32 sz)
} }
/* Der Encode r & s ints into out, outLen is (in/out) size */ /* Der Encode r & s ints into out, outLen is (in/out) size */
/* All input/outputs are assumed to be big-endian */
int StoreECC_DSA_Sig_Bin(byte* out, word32* outLen, const byte* r, word32 rLen, int StoreECC_DSA_Sig_Bin(byte* out, word32* outLen, const byte* r, word32 rLen,
const byte* s, word32 sLen) const byte* s, word32 sLen)
{ {
@@ -15501,8 +15498,8 @@ int StoreECC_DSA_Sig_Bin(byte* out, word32* outLen, const byte* r, word32 rLen,
return 0; return 0;
} }
/* Der Decode ECC-DSA Signature with R/S as unsigned bin */ /* Der Decode ECC-DSA Signature with R/S as unsigned bin */
/* All input/outputs are assumed to be big-endian */
int DecodeECC_DSA_Sig_Bin(const byte* sig, word32 sigLen, byte* r, word32* rLen, int DecodeECC_DSA_Sig_Bin(const byte* sig, word32 sigLen, byte* r, word32* rLen,
byte* s, word32* sLen) byte* s, word32* sLen)
{ {