diff options
Diffstat (limited to 'security/nss/lib/ckfw/capi/crsa.c')
| -rw-r--r-- | security/nss/lib/ckfw/capi/crsa.c | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/security/nss/lib/ckfw/capi/crsa.c b/security/nss/lib/ckfw/capi/crsa.c new file mode 100644 index 000000000..62f90acb6 --- /dev/null +++ b/security/nss/lib/ckfw/capi/crsa.c @@ -0,0 +1,687 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "ckcapi.h" +#include "secdert.h" + +#define SSL3_SHAMD5_HASH_SIZE 36 /* LEN_MD5 (16) + LEN_SHA1 (20) */ + +/* + * ckcapi/crsa.c + * + * This file implements the NSSCKMDMechnaism and NSSCKMDCryptoOperation objects + * for the RSA operation on the CAPI cryptoki module. + */ + +/* + * write a Decimal value to a string + */ + +static char * +putDecimalString(char *cstr, unsigned long value) +{ + unsigned long tenpower; + int first = 1; + + for (tenpower = 10000000; tenpower; tenpower /= 10) { + unsigned char digit = (unsigned char)(value / tenpower); + value = value % tenpower; + + /* drop leading zeros */ + if (first && (0 == digit)) { + continue; + } + first = 0; + *cstr++ = digit + '0'; + } + + /* if value was zero, put one of them out */ + if (first) { + *cstr++ = '0'; + } + return cstr; +} + +/* + * Create a Capi OID string value from a DER OID + */ +static char * +nss_ckcapi_GetOidString( + unsigned char *oidTag, + unsigned int oidTagSize, + CK_RV *pError) +{ + unsigned char *oid; + char *oidStr; + char *cstr; + unsigned long value; + unsigned int oidSize; + + if (DER_OBJECT_ID != *oidTag) { + /* wasn't an oid */ + *pError = CKR_DATA_INVALID; + return NULL; + } + oid = nss_ckcapi_DERUnwrap(oidTag, oidTagSize, &oidSize, NULL); + + if (oidSize < 2) { + *pError = CKR_DATA_INVALID; + return NULL; + } + + oidStr = nss_ZNEWARRAY(NULL, char, oidSize * 4); + if ((char *)NULL == oidStr) { + *pError = CKR_HOST_MEMORY; + return NULL; + } + cstr = oidStr; + cstr = putDecimalString(cstr, (*oid) / 40); + *cstr++ = '.'; + cstr = putDecimalString(cstr, (*oid) % 40); + oidSize--; + + value = 0; + while (oidSize--) { + oid++; + value = (value << 7) + (*oid & 0x7f); + if (0 == (*oid & 0x80)) { + *cstr++ = '.'; + cstr = putDecimalString(cstr, value); + value = 0; + } + } + + *cstr = 0; /* NULL terminate */ + + if (value != 0) { + nss_ZFreeIf(oidStr); + *pError = CKR_DATA_INVALID; + return NULL; + } + return oidStr; +} + +/* + * PKCS #11 sign for RSA expects to take a fully DER-encoded hash value, + * which includes the hash OID. CAPI expects to take a Hash Context. While + * CAPI does have the capability of setting a raw hash value, it does not + * have the ability to sign an arbitrary value. This function tries to + * reduce the passed in data into something that CAPI could actually sign. + */ +static CK_RV +ckcapi_GetRawHash( + const NSSItem *input, + NSSItem *hash, + ALG_ID *hashAlg) +{ + unsigned char *current; + unsigned char *algid; + unsigned char *oid; + unsigned char *hashData; + char *oidStr; + CK_RV error; + unsigned int oidSize; + unsigned int size; + /* + * there are 2 types of hashes NSS typically tries to sign, regular + * RSA signature format (with encoded DER_OIDS), and SSL3 Signed hashes. + * CAPI knows not to add any oids to SSL3_Signed hashes, so if we have any + * random hash that is exactly the same size as an SSL3 hash, then we can + * just pass the data through. CAPI has know way of knowing if the value + * is really a combined hash or some other arbitrary data, so it's safe to + * handle this case first. + */ + if (SSL3_SHAMD5_HASH_SIZE == input->size) { + hash->data = input->data; + hash->size = input->size; + *hashAlg = CALG_SSL3_SHAMD5; + return CKR_OK; + } + + current = (unsigned char *)input->data; + + /* make sure we have a sequence tag */ + if ((DER_SEQUENCE | DER_CONSTRUCTED) != *current) { + return CKR_DATA_INVALID; + } + + /* parse the input block to get 1) the hash oid, and 2) the raw hash value. + * unfortunatly CAPI doesn't have a builtin function to do this work, so + * we go ahead and do it by hand here. + * + * format is: + * SEQUENCE { + * SECQUENCE { // algid + * OID {} // oid + * ANY {} // optional params + * } + * OCTECT {} // hash + */ + + /* unwrap */ + algid = nss_ckcapi_DERUnwrap(current, input->size, &size, NULL); + + if (algid + size != current + input->size) { + /* make sure there is not extra data at the end */ + return CKR_DATA_INVALID; + } + + if ((DER_SEQUENCE | DER_CONSTRUCTED) != *algid) { + /* wasn't an algid */ + return CKR_DATA_INVALID; + } + oid = nss_ckcapi_DERUnwrap(algid, size, &oidSize, &hashData); + + if (DER_OCTET_STRING != *hashData) { + /* wasn't a hash */ + return CKR_DATA_INVALID; + } + + /* get the real hash */ + current = hashData; + size = size - (hashData - algid); + hash->data = nss_ckcapi_DERUnwrap(current, size, &hash->size, NULL); + + /* get the real oid as a string. Again, Microsoft does not + * export anything that does this for us */ + oidStr = nss_ckcapi_GetOidString(oid, oidSize, &error); + if ((char *)NULL == oidStr) { + return error; + } + + /* look up the hash alg from the oid (fortunately CAPI does to this) */ + *hashAlg = CertOIDToAlgId(oidStr); + nss_ZFreeIf(oidStr); + if (0 == *hashAlg) { + return CKR_HOST_MEMORY; + } + + /* hash looks reasonably consistent, we should be able to sign it now */ + return CKR_OK; +} + +/* + * So everyone else in the worlds stores their bignum data MSB first, but not + * Microsoft, we need to byte swap everything coming into and out of CAPI. + */ +void +ckcapi_ReverseData(NSSItem *item) +{ + int end = (item->size) - 1; + int middle = (item->size) / 2; + unsigned char *buf = item->data; + int i; + + for (i = 0; i < middle; i++) { + unsigned char tmp = buf[i]; + buf[i] = buf[end - i]; + buf[end - i] = tmp; + } + return; +} + +typedef struct ckcapiInternalCryptoOperationRSAPrivStr + ckcapiInternalCryptoOperationRSAPriv; +struct ckcapiInternalCryptoOperationRSAPrivStr { + NSSCKMDCryptoOperation mdOperation; + NSSCKMDMechanism *mdMechanism; + ckcapiInternalObject *iKey; + HCRYPTPROV hProv; + DWORD keySpec; + HCRYPTKEY hKey; + NSSItem *buffer; +}; + +/* + * ckcapi_mdCryptoOperationRSAPriv_Create + */ +static NSSCKMDCryptoOperation * +ckcapi_mdCryptoOperationRSAPriv_Create( + const NSSCKMDCryptoOperation *proto, + NSSCKMDMechanism *mdMechanism, + NSSCKMDObject *mdKey, + CK_RV *pError) +{ + ckcapiInternalObject *iKey = (ckcapiInternalObject *)mdKey->etc; + const NSSItem *classItem = nss_ckcapi_FetchAttribute(iKey, CKA_CLASS); + const NSSItem *keyType = nss_ckcapi_FetchAttribute(iKey, CKA_KEY_TYPE); + ckcapiInternalCryptoOperationRSAPriv *iOperation; + CK_RV error; + HCRYPTPROV hProv; + DWORD keySpec; + HCRYPTKEY hKey; + + /* make sure we have the right objects */ + if (((const NSSItem *)NULL == classItem) || + (sizeof(CK_OBJECT_CLASS) != classItem->size) || + (CKO_PRIVATE_KEY != *(CK_OBJECT_CLASS *)classItem->data) || + ((const NSSItem *)NULL == keyType) || + (sizeof(CK_KEY_TYPE) != keyType->size) || + (CKK_RSA != *(CK_KEY_TYPE *)keyType->data)) { + *pError = CKR_KEY_TYPE_INCONSISTENT; + return (NSSCKMDCryptoOperation *)NULL; + } + + error = nss_ckcapi_FetchKeyContainer(iKey, &hProv, &keySpec, &hKey); + if (error != CKR_OK) { + *pError = error; + return (NSSCKMDCryptoOperation *)NULL; + } + + iOperation = nss_ZNEW(NULL, ckcapiInternalCryptoOperationRSAPriv); + if ((ckcapiInternalCryptoOperationRSAPriv *)NULL == iOperation) { + *pError = CKR_HOST_MEMORY; + return (NSSCKMDCryptoOperation *)NULL; + } + iOperation->mdMechanism = mdMechanism; + iOperation->iKey = iKey; + iOperation->hProv = hProv; + iOperation->keySpec = keySpec; + iOperation->hKey = hKey; + + nsslibc_memcpy(&iOperation->mdOperation, + proto, sizeof(NSSCKMDCryptoOperation)); + iOperation->mdOperation.etc = iOperation; + + return &iOperation->mdOperation; +} + +static CK_RV +ckcapi_mdCryptoOperationRSAPriv_Destroy( + NSSCKMDCryptoOperation *mdOperation, + NSSCKFWCryptoOperation *fwOperation, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance) +{ + ckcapiInternalCryptoOperationRSAPriv *iOperation = + (ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc; + + if (iOperation->hKey) { + CryptDestroyKey(iOperation->hKey); + } + if (iOperation->buffer) { + nssItem_Destroy(iOperation->buffer); + } + nss_ZFreeIf(iOperation); + return CKR_OK; +} + +static CK_ULONG +ckcapi_mdCryptoOperationRSA_GetFinalLength( + NSSCKMDCryptoOperation *mdOperation, + NSSCKFWCryptoOperation *fwOperation, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + CK_RV *pError) +{ + ckcapiInternalCryptoOperationRSAPriv *iOperation = + (ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc; + const NSSItem *modulus = + nss_ckcapi_FetchAttribute(iOperation->iKey, CKA_MODULUS); + + return modulus->size; +} + +/* + * ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength + * we won't know the length until we actually decrypt the + * input block. Since we go to all the work to decrypt the + * the block, we'll save if for when the block is asked for + */ +static CK_ULONG +ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength( + NSSCKMDCryptoOperation *mdOperation, + NSSCKFWCryptoOperation *fwOperation, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + const NSSItem *input, + CK_RV *pError) +{ + ckcapiInternalCryptoOperationRSAPriv *iOperation = + (ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc; + BOOL rc; + + /* Microsoft's Decrypt operation works in place. Since we don't want + * to trash our input buffer, we make a copy of it */ + iOperation->buffer = nssItem_Duplicate((NSSItem *)input, NULL, NULL); + if ((NSSItem *)NULL == iOperation->buffer) { + *pError = CKR_HOST_MEMORY; + return 0; + } + /* Sigh, reverse it */ + ckcapi_ReverseData(iOperation->buffer); + + rc = CryptDecrypt(iOperation->hKey, 0, TRUE, 0, + iOperation->buffer->data, &iOperation->buffer->size); + if (!rc) { + DWORD msError = GetLastError(); + switch (msError) { + case NTE_BAD_DATA: + *pError = + CKR_ENCRYPTED_DATA_INVALID; + break; + case NTE_FAIL: + case NTE_BAD_UID: + *pError = + CKR_DEVICE_ERROR; + break; + default: + *pError = + CKR_GENERAL_ERROR; + } + return 0; + } + + return iOperation->buffer->size; +} + +/* + * ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal + * + * NOTE: ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength is presumed to + * have been called previously. + */ +static CK_RV +ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal( + NSSCKMDCryptoOperation *mdOperation, + NSSCKFWCryptoOperation *fwOperation, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + const NSSItem *input, + NSSItem *output) +{ + ckcapiInternalCryptoOperationRSAPriv *iOperation = + (ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc; + NSSItem *buffer = iOperation->buffer; + + if ((NSSItem *)NULL == buffer) { + return CKR_GENERAL_ERROR; + } + nsslibc_memcpy(output->data, buffer->data, buffer->size); + output->size = buffer->size; + return CKR_OK; +} + +/* + * ckcapi_mdCryptoOperationRSASign_UpdateFinal + * + */ +static CK_RV +ckcapi_mdCryptoOperationRSASign_UpdateFinal( + NSSCKMDCryptoOperation *mdOperation, + NSSCKFWCryptoOperation *fwOperation, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + const NSSItem *input, + NSSItem *output) +{ + ckcapiInternalCryptoOperationRSAPriv *iOperation = + (ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc; + CK_RV error = CKR_OK; + DWORD msError; + NSSItem hash; + HCRYPTHASH hHash = 0; + ALG_ID hashAlg; + DWORD hashSize; + DWORD len; /* temp length value we throw away */ + BOOL rc; + + /* + * PKCS #11 sign for RSA expects to take a fully DER-encoded hash value, + * which includes the hash OID. CAPI expects to take a Hash Context. While + * CAPI does have the capability of setting a raw hash value, it does not + * have the ability to sign an arbitrary value. This function tries to + * reduce the passed in data into something that CAPI could actually sign. + */ + error = ckcapi_GetRawHash(input, &hash, &hashAlg); + if (CKR_OK != error) { + goto loser; + } + + rc = CryptCreateHash(iOperation->hProv, hashAlg, 0, 0, &hHash); + if (!rc) { + goto loser; + } + + /* make sure the hash lens match before we set it */ + len = sizeof(DWORD); + rc = CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&hashSize, &len, 0); + if (!rc) { + goto loser; + } + + if (hash.size != hashSize) { + /* The input must have been bad for this to happen */ + error = CKR_DATA_INVALID; + goto loser; + } + + /* we have an explicit hash, set it, note that the length is + * implicit by the hashAlg used in create */ + rc = CryptSetHashParam(hHash, HP_HASHVAL, hash.data, 0); + if (!rc) { + goto loser; + } + + /* OK, we have the data in a hash structure, sign it! */ + rc = CryptSignHash(hHash, iOperation->keySpec, NULL, 0, + output->data, &output->size); + if (!rc) { + goto loser; + } + + /* Don't return a signature that might have been broken because of a cosmic + * ray, or a broken processor, verify that it is valid... */ + rc = CryptVerifySignature(hHash, output->data, output->size, + iOperation->hKey, NULL, 0); + if (!rc) { + goto loser; + } + + /* OK, Microsoft likes to do things completely differently than anyone + * else. We need to reverse the data we received here */ + ckcapi_ReverseData(output); + CryptDestroyHash(hHash); + return CKR_OK; + +loser: + /* map the microsoft error */ + if (CKR_OK == error) { + msError = GetLastError(); + switch (msError) { + case ERROR_NOT_ENOUGH_MEMORY: + error = + CKR_HOST_MEMORY; + break; + case NTE_NO_MEMORY: + error = + CKR_DEVICE_MEMORY; + break; + case ERROR_MORE_DATA: + return CKR_BUFFER_TOO_SMALL; + case ERROR_INVALID_PARAMETER: /* these params were derived from the */ + case ERROR_INVALID_HANDLE: /* inputs, so if they are bad, the input */ + case NTE_BAD_ALGID: /* data is bad */ + case NTE_BAD_HASH: + error = + CKR_DATA_INVALID; + break; + case ERROR_BUSY: + case NTE_FAIL: + case NTE_BAD_UID: + error = + CKR_DEVICE_ERROR; + break; + default: + error = + CKR_GENERAL_ERROR; + break; + } + } + if (hHash) { + CryptDestroyHash(hHash); + } + return error; +} + +NSS_IMPLEMENT_DATA const NSSCKMDCryptoOperation + ckcapi_mdCryptoOperationRSADecrypt_proto = { + NULL, /* etc */ + ckcapi_mdCryptoOperationRSAPriv_Destroy, + NULL, /* GetFinalLengh - not needed for one shot Decrypt/Encrypt */ + ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength, + NULL, /* Final - not needed for one shot operation */ + NULL, /* Update - not needed for one shot operation */ + NULL, /* DigetUpdate - not needed for one shot operation */ + ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal, + NULL, /* UpdateCombo - not needed for one shot operation */ + NULL, /* DigetKey - not needed for one shot operation */ + (void *)NULL /* null terminator */ + }; + +NSS_IMPLEMENT_DATA const NSSCKMDCryptoOperation + ckcapi_mdCryptoOperationRSASign_proto = { + NULL, /* etc */ + ckcapi_mdCryptoOperationRSAPriv_Destroy, + ckcapi_mdCryptoOperationRSA_GetFinalLength, + NULL, /* GetOperationLengh - not needed for one shot Sign/Verify */ + NULL, /* Final - not needed for one shot operation */ + NULL, /* Update - not needed for one shot operation */ + NULL, /* DigetUpdate - not needed for one shot operation */ + ckcapi_mdCryptoOperationRSASign_UpdateFinal, + NULL, /* UpdateCombo - not needed for one shot operation */ + NULL, /* DigetKey - not needed for one shot operation */ + (void *)NULL /* null terminator */ + }; + +/********** NSSCKMDMechansim functions ***********************/ +/* + * ckcapi_mdMechanismRSA_Destroy + */ +static void +ckcapi_mdMechanismRSA_Destroy( + NSSCKMDMechanism *mdMechanism, + NSSCKFWMechanism *fwMechanism, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance) +{ + nss_ZFreeIf(fwMechanism); +} + +/* + * ckcapi_mdMechanismRSA_GetMinKeySize + */ +static CK_ULONG +ckcapi_mdMechanismRSA_GetMinKeySize( + NSSCKMDMechanism *mdMechanism, + NSSCKFWMechanism *fwMechanism, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + CK_RV *pError) +{ + return 384; +} + +/* + * ckcapi_mdMechanismRSA_GetMaxKeySize + */ +static CK_ULONG +ckcapi_mdMechanismRSA_GetMaxKeySize( + NSSCKMDMechanism *mdMechanism, + NSSCKFWMechanism *fwMechanism, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + CK_RV *pError) +{ + return 16384; +} + +/* + * ckcapi_mdMechanismRSA_DecryptInit + */ +static NSSCKMDCryptoOperation * +ckcapi_mdMechanismRSA_DecryptInit( + NSSCKMDMechanism *mdMechanism, + NSSCKFWMechanism *fwMechanism, + CK_MECHANISM *pMechanism, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + NSSCKMDObject *mdKey, + NSSCKFWObject *fwKey, + CK_RV *pError) +{ + return ckcapi_mdCryptoOperationRSAPriv_Create( + &ckcapi_mdCryptoOperationRSADecrypt_proto, + mdMechanism, mdKey, pError); +} + +/* + * ckcapi_mdMechanismRSA_SignInit + */ +static NSSCKMDCryptoOperation * +ckcapi_mdMechanismRSA_SignInit( + NSSCKMDMechanism *mdMechanism, + NSSCKFWMechanism *fwMechanism, + CK_MECHANISM *pMechanism, + NSSCKMDSession *mdSession, + NSSCKFWSession *fwSession, + NSSCKMDToken *mdToken, + NSSCKFWToken *fwToken, + NSSCKMDInstance *mdInstance, + NSSCKFWInstance *fwInstance, + NSSCKMDObject *mdKey, + NSSCKFWObject *fwKey, + CK_RV *pError) +{ + return ckcapi_mdCryptoOperationRSAPriv_Create( + &ckcapi_mdCryptoOperationRSASign_proto, + mdMechanism, mdKey, pError); +} + +NSS_IMPLEMENT_DATA const NSSCKMDMechanism + nss_ckcapi_mdMechanismRSA = { + (void *)NULL, /* etc */ + ckcapi_mdMechanismRSA_Destroy, + ckcapi_mdMechanismRSA_GetMinKeySize, + ckcapi_mdMechanismRSA_GetMaxKeySize, + NULL, /* GetInHardware - default false */ + NULL, /* EncryptInit - default errs */ + ckcapi_mdMechanismRSA_DecryptInit, + NULL, /* DigestInit - default errs*/ + ckcapi_mdMechanismRSA_SignInit, + NULL, /* VerifyInit - default errs */ + ckcapi_mdMechanismRSA_SignInit, /* SignRecoverInit */ + NULL, /* VerifyRecoverInit - default errs */ + NULL, /* GenerateKey - default errs */ + NULL, /* GenerateKeyPair - default errs */ + NULL, /* GetWrapKeyLength - default errs */ + NULL, /* WrapKey - default errs */ + NULL, /* UnwrapKey - default errs */ + NULL, /* DeriveKey - default errs */ + (void *)NULL /* null terminator */ + }; |