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tpm2: Implement ObjectGetPublicParameters to get N and E from OBJECT

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Get the BIGNUMs N and E from an RSA key OBJECT. The purpose of
this refactoring is be able to reuse the new function.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Stefan Berger 2021-09-23 17:34:32 -04:00 committed by Stefan Berger
parent 3eef1fb035
commit f7ccda56fb
1 changed files with 36 additions and 16 deletions
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52
src/tpm2/crypto/openssl/Helpers.c
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@ -485,6 +485,40 @@ error_free_ned:
return 0;
}
static int
ObjectGetPublicParameters(OBJECT *key, // IN
BIGNUM **N, // OUT
BIGNUM **E // OUT
)
{
BN_ULONG eval;
*E = BN_new();
if (*E == NULL)
return 0;
if(key->publicArea.parameters.rsaDetail.exponent != 0)
eval = key->publicArea.parameters.rsaDetail.exponent;
else
eval = RSA_DEFAULT_PUBLIC_EXPONENT;
if (BN_set_word(*E, eval) != 1)
goto error;
*N = BN_bin2bn(key->publicArea.unique.rsa.b.buffer,
key->publicArea.unique.rsa.b.size, NULL);
if (*N == NULL)
goto error;
return 1;
error:
BN_free(*E);
*E = NULL;
return 0;
}
LIB_EXPORT TPM_RC
InitOpenSSLRSAPublicKey(OBJECT *key, // IN
EVP_PKEY **pkey // OUT
@ -492,23 +526,9 @@ InitOpenSSLRSAPublicKey(OBJECT *key, // IN
{
TPM_RC retVal;
BIGNUM *N = NULL;
BIGNUM *E = BN_new();
BN_ULONG eval;
BIGNUM *E = NULL;
if (E == NULL)
ERROR_RETURN(TPM_RC_FAILURE);
if(key->publicArea.parameters.rsaDetail.exponent != 0)
eval = key->publicArea.parameters.rsaDetail.exponent;
else
eval = RSA_DEFAULT_PUBLIC_EXPONENT;
if (BN_set_word(E, eval) != 1)
ERROR_RETURN(TPM_RC_FAILURE);
N = BN_bin2bn(key->publicArea.unique.rsa.b.buffer,
key->publicArea.unique.rsa.b.size, NULL);
if (N == NULL ||
if (ObjectGetPublicParameters(key, &N, &E) != 1 ||
BuildRSAKey(pkey, N, E, NULL, NULL, NULL, NULL, NULL, NULL) != 1)
ERROR_RETURN(TPM_RC_FAILURE)