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Added new ECC API `wc_ecc_rs_raw_to_sig` to take raw unsigned R and S and encodes them into ECDSA signature format.

This commit is contained in:
David Garske 2018-03-14 10:59:25 -07:00
parent 72f390a102
commit 9ccf876a21
2 changed files with 45 additions and 0 deletions
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42
wolfcrypt/src/ecc.c
View File

@ -5580,6 +5580,48 @@ int wc_ecc_rs_to_sig(const char* r, const char* s, byte* out, word32* outlen)
return err;
}
/**
Convert ECC R,S raw unsigned bin to signature
r R component of signature
rSz R size
s S component of signature
sSz S size
out DER-encoded ECDSA signature
outlen [in/out] output buffer size, output signature size
return MP_OKAY on success
*/
int wc_ecc_rs_raw_to_sig(const byte* r, word32 rSz, const byte* s, word32 sSz,
byte* out, word32* outlen)
{
int err;
mp_int rtmp;
mp_int stmp;
if (r == NULL || s == NULL || out == NULL || outlen == NULL)
return ECC_BAD_ARG_E;
err = mp_init_multi(&rtmp, &stmp, NULL, NULL, NULL, NULL);
if (err != MP_OKAY)
return err;
err = mp_read_unsigned_bin(&rtmp, r, rSz);
if (err == MP_OKAY)
err = mp_read_unsigned_bin(&stmp, s, sSz);
/* convert mp_ints to ECDSA sig, initializes rtmp and stmp internally */
if (err == MP_OKAY)
err = StoreECC_DSA_Sig(out, outlen, &rtmp, &stmp);
if (err == MP_OKAY) {
if (mp_iszero(&rtmp) == MP_YES || mp_iszero(&stmp) == MP_YES)
err = MP_ZERO_E;
}
mp_clear(&rtmp);
mp_clear(&stmp);
return err;
}
/**
Convert ECC signature to R,S

3
wolfssl/wolfcrypt/ecc.h
View File

@ -487,6 +487,9 @@ int wc_ecc_import_private_key_ex(const byte* priv, word32 privSz,
WOLFSSL_API
int wc_ecc_rs_to_sig(const char* r, const char* s, byte* out, word32* outlen);
WOLFSSL_API
int wc_ecc_rs_raw_to_sig(const byte* r, word32 rSz, const byte* s, word32 sSz,
byte* out, word32* outlen);
WOLFSSL_API
int wc_ecc_sig_to_rs(const byte* sig, word32 sigLen, byte* r, word32* rLen,
byte* s, word32* sLen);
WOLFSSL_API