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Added function to flatten the RSA public key to a pair of byte arrays

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This commit is contained in:
John Safranek 2014-09-03 23:10:10 -07:00
parent 8bb52380a8
commit 1a88e9fbdc
2 changed files with 29 additions and 0 deletions
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27
ctaocrypt/src/rsa.c
View File

@ -469,6 +469,33 @@ int RsaEncryptSize(RsaKey* key)
}
int RsaFlattenPublicKey(RsaKey* key, byte* e, word32* eSz, byte* n, word32* nSz)
{
int sz, ret;
if (key == NULL || e == NULL || eSz == NULL || n == NULL || nSz == NULL)
return BAD_FUNC_ARG;
sz = mp_unsigned_bin_size(&key->e);
if ((word32)sz > *nSz)
return RSA_BUFFER_E;
ret = mp_to_unsigned_bin(&key->e, e);
if (ret != MP_OKAY)
return ret;
*eSz = (word32)sz;
sz = mp_unsigned_bin_size(&key->n);
if ((word32)sz > *nSz)
return RSA_BUFFER_E;
ret = mp_to_unsigned_bin(&key->n, n);
if (ret != MP_OKAY)
return ret;
*nSz = (word32)sz;
return 0;
}
#ifdef CYASSL_KEY_GEN
static const int USE_BBS = 1;

2
cyassl/ctaocrypt/rsa.h
View File

@ -82,6 +82,8 @@ CYASSL_API int RsaPrivateKeyDecode(const byte* input, word32* inOutIdx, RsaKey*,
word32);
CYASSL_API int RsaPublicKeyDecode(const byte* input, word32* inOutIdx, RsaKey*,
word32);
CYASSL_API int RsaFlattenPublicKey(RsaKey*, byte*, word32*, byte*, word32*);
#ifdef CYASSL_KEY_GEN
CYASSL_API int MakeRsaKey(RsaKey* key, int size, long e, RNG* rng);
CYASSL_API int RsaKeyToDer(RsaKey*, byte* output, word32 inLen);