150 lines
2.5 KiB
C++
150 lines
2.5 KiB
C++
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// CryptoKey.cpp
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// Implements the cCryptoKey class representing a RSA public key in PolarSSL
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#include "Globals.h"
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#include "CryptoKey.h"
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cCryptoKey::cCryptoKey(void)
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{
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pk_init(&m_Pk);
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m_CtrDrbg.Initialize("rsa_pubkey", 10);
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}
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cCryptoKey::cCryptoKey(const AString & a_PublicKeyData)
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{
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pk_init(&m_Pk);
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m_CtrDrbg.Initialize("rsa_pubkey", 10);
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int res = ParsePublic(a_PublicKeyData.data(), a_PublicKeyData.size());
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if (res != 0)
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{
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LOGWARNING("Failed to parse public key: -0x%x", res);
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ASSERT(!"Cannot parse PubKey");
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return;
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}
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}
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cCryptoKey::cCryptoKey(const AString & a_PrivateKeyData, const AString & a_Password)
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{
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pk_init(&m_Pk);
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m_CtrDrbg.Initialize("rsa_privkey", 11);
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int res = ParsePrivate(a_PrivateKeyData.data(), a_PrivateKeyData.size(), a_Password);
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if (res != 0)
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{
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LOGWARNING("Failed to parse private key: -0x%x", res);
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ASSERT(!"Cannot parse PrivKey");
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return;
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}
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}
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cCryptoKey::~cCryptoKey()
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{
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pk_free(&m_Pk);
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}
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int cCryptoKey::Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength)
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{
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ASSERT(IsValid());
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size_t DecryptedLen = a_DecryptedMaxLength;
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int res = pk_decrypt(&m_Pk,
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a_EncryptedData, a_EncryptedLength,
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a_DecryptedData, &DecryptedLen, a_DecryptedMaxLength,
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ctr_drbg_random, m_CtrDrbg.GetInternal()
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);
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if (res != 0)
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{
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return res;
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}
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return (int)DecryptedLen;
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}
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int cCryptoKey::Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength)
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{
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ASSERT(IsValid());
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size_t EncryptedLength = a_EncryptedMaxLength;
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int res = pk_encrypt(&m_Pk,
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a_PlainData, a_PlainLength, a_EncryptedData, &EncryptedLength, a_EncryptedMaxLength,
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ctr_drbg_random, m_CtrDrbg.GetInternal()
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);
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if (res != 0)
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{
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return res;
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}
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return (int)EncryptedLength;
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}
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int cCryptoKey::ParsePublic(const void * a_Data, size_t a_NumBytes)
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{
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ASSERT(!IsValid()); // Cannot parse a second key
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return pk_parse_public_key(&m_Pk, (const unsigned char *)a_Data, a_NumBytes);
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}
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int cCryptoKey::ParsePrivate(const void * a_Data, size_t a_NumBytes, const AString & a_Password)
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{
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ASSERT(!IsValid()); // Cannot parse a second key
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if (a_Password.empty())
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{
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return pk_parse_key(&m_Pk, (const unsigned char *)a_Data, a_NumBytes, nullptr, 0);
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}
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else
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{
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return pk_parse_key(
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&m_Pk,
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(const unsigned char *)a_Data, a_NumBytes,
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(const unsigned char *)a_Password.c_str(), a_Password.size()
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);
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}
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}
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bool cCryptoKey::IsValid(void) const
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{
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return (pk_get_type(&m_Pk) != POLARSSL_PK_NONE);
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}
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