Initial draft of AES GCM cipher suites. Missing SHA-384 support.
This commit is contained in:
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737cd127e8
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3a9a195683
@ -233,6 +233,11 @@ void c32to24(word32 in, word24 out);
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#define BUILD_AES
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#endif
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#if defined(BUILD_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256) || \
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defined(BUILD_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)
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#define BUILD_AESGCM
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#endif
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#if defined(BUILD_TLS_RSA_WITH_HC_128_CBC_SHA) || \
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defined(BUILD_TLS_RSA_WITH_HC_128_CBC_MD5)
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#define BUILD_HC128
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@ -398,6 +403,8 @@ enum Misc {
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AES_256_KEY_SIZE = 32, /* for 256 bit */
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AES_192_KEY_SIZE = 24, /* for 192 bit */
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AES_IV_SIZE = 16, /* always block size */
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AES_GCM_IMPLICIT_IV_SIZE = 4, /* Implicit half of IV */
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AES_GCM_EXPLICIT_IV_SIZE = 8, /* Explicit half of IV */
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AES_128_KEY_SIZE = 16, /* for 128 bit */
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HC_128_KEY_SIZE = 16, /* 128 bits */
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@ -1167,6 +1174,9 @@ struct CYASSL {
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Sha hashSha; /* sha hash of handshake msgs */
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#ifndef NO_SHA256
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Sha256 hashSha256; /* sha256 hash of handshake msgs */
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#endif
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#ifdef CYASSL_SHA384
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Sha384 hashSha384; /* sha384 hash of handshake msgs */
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#endif
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Hashes verifyHashes;
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Hashes certHashes; /* for cert verify */
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src/internal.c
220
src/internal.c
@ -886,6 +886,9 @@ int InitSSL(CYASSL* ssl, CYASSL_CTX* ctx)
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InitSha(&ssl->hashSha);
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#ifndef NO_SHA256
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InitSha256(&ssl->hashSha256);
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#endif
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#ifdef CYASSL_SHA384
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InitSha384(&ssl->hashSha384);
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#endif
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InitRsaKey(&ssl->peerRsaKey, ctx->heap);
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@ -1177,10 +1180,14 @@ static void HashOutput(CYASSL* ssl, const byte* output, int sz, int ivSz)
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Md5Update(&ssl->hashMd5, adj, sz);
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ShaUpdate(&ssl->hashSha, adj, sz);
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if (IsAtLeastTLSv1_2(ssl)) {
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#ifndef NO_SHA256
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if (IsAtLeastTLSv1_2(ssl))
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Sha256Update(&ssl->hashSha256, adj, sz);
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#endif
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#ifdef CYASSL_SHA384
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Sha384Update(&ssl->hashSha384, adj, sz);
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#endif
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}
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}
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@ -1199,10 +1206,14 @@ static void HashInput(CYASSL* ssl, const byte* input, int sz)
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Md5Update(&ssl->hashMd5, adj, sz);
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ShaUpdate(&ssl->hashSha, adj, sz);
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if (IsAtLeastTLSv1_2(ssl)) {
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#ifndef NO_SHA256
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if (IsAtLeastTLSv1_2(ssl))
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Sha256Update(&ssl->hashSha256, adj, sz);
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#endif
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#ifdef CYASSL_SHA384
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Sha384Update(&ssl->hashSha384, adj, sz);
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#endif
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}
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}
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@ -1624,6 +1635,12 @@ static void BuildFinished(CYASSL* ssl, Hashes* hashes, const byte* sender)
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if (IsAtLeastTLSv1_2(ssl))
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sha256 = ssl->hashSha256;
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#endif
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#if CYASSL_SHA384
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Sha384 sha384;
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InitSha384(&sha384);
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if (IsAtLeastTLSv1_2(ssl))
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sha384 = ssl->hashSha384;
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#endif
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if (ssl->options.tls)
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BuildTlsFinished(ssl, hashes, sender);
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@ -1639,6 +1656,10 @@ static void BuildFinished(CYASSL* ssl, Hashes* hashes, const byte* sender)
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if (IsAtLeastTLSv1_2(ssl))
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ssl->hashSha256 = sha256;
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#endif
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#ifdef CYASSL_SHA384
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if (IsAtLeastTLSv1_2(ssl))
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ssl->hashSha384 = sha384;
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#endif
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}
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@ -2017,24 +2038,30 @@ int DoFinished(CYASSL* ssl, const byte* input, word32* inOutIdx, int sniff)
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}
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}
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ssl->hmac(ssl, verifyMAC, input + idx - headerSz, macSz,
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handshake, 1);
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idx += finishedSz;
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if (ssl->specs.cipher_type != aead) {
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ssl->hmac(ssl, verifyMAC, input + idx - headerSz, macSz,
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handshake, 1);
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idx += finishedSz;
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/* read mac and fill */
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mac = input + idx;
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idx += ssl->specs.hash_size;
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/* read mac and fill */
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mac = input + idx;
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idx += ssl->specs.hash_size;
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if (ssl->options.tls1_1 && ssl->specs.cipher_type == block)
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padSz -= ssl->specs.block_size;
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if (ssl->options.tls1_1 && ssl->specs.cipher_type == block)
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padSz -= ssl->specs.block_size;
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idx += padSz;
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idx += padSz;
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/* verify mac */
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if (XMEMCMP(mac, verifyMAC, ssl->specs.hash_size)) {
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CYASSL_MSG("Verify finished error on mac");
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return VERIFY_MAC_ERROR;
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}
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/* verify mac */
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if (XMEMCMP(mac, verifyMAC, ssl->specs.hash_size)) {
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CYASSL_MSG("Verify finished error on mac");
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return VERIFY_MAC_ERROR;
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}
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}
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else {
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idx = idx + finishedSz + 16;
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/* XXX the 16 should be from specs */
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}
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if (ssl->options.side == CLIENT_END) {
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ssl->options.serverState = SERVER_FINISHED_COMPLETE;
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@ -2156,6 +2183,15 @@ static int DoHandShakeMsg(CYASSL* ssl, byte* input, word32* inOutIdx,
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}
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static INLINE word32 GetSEQIncrement(CYASSL* ssl, int verify)
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{
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if (verify)
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return ssl->keys.peer_sequence_number++;
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else
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return ssl->keys.sequence_number++;
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}
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static INLINE void Encrypt(CYASSL* ssl, byte* out, const byte* input, word32 sz)
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{
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switch (ssl->specs.bulk_cipher_algorithm) {
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@ -2186,6 +2222,35 @@ static INLINE void Encrypt(CYASSL* ssl, byte* out, const byte* input, word32 sz)
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break;
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#endif
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#ifdef BUILD_AESGCM
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case aes_gcm:
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{
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byte additional[AES_BLOCK_SIZE];
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byte nonce[AES_BLOCK_SIZE];
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if (ssl->options.side == SERVER_END) {
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XMEMCPY(nonce, ssl->keys.server_write_IV,
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AES_GCM_IMPLICIT_IV_SIZE);
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}
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else {
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XMEMCPY(nonce, ssl->keys.client_write_IV,
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AES_GCM_IMPLICIT_IV_SIZE);
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}
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XMEMCPY(nonce + AES_GCM_IMPLICIT_IV_SIZE,
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input, AES_GCM_EXPLICIT_IV_SIZE);
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XMEMSET(nonce + AES_GCM_IMPLICIT_IV_SIZE +
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AES_GCM_EXPLICIT_IV_SIZE, 0, 4);
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AesSetIV(&ssl->encrypt.aes, nonce);
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XMEMSET(additional, 0, 16);
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c32toa(GetSEQIncrement(ssl, 0), additional + 4);
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XMEMCPY(additional+8, input - 5, 5);
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AesGcmEncrypt(&ssl->encrypt.aes, out+8, input+8, sz-24,
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out + 8 + (sz - 24), 16, additional, 13);
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}
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break;
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#endif
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#ifdef HAVE_HC128
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case hc128:
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Hc128_Process(&ssl->encrypt.hc128, out, input, sz);
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@ -2204,7 +2269,7 @@ static INLINE void Encrypt(CYASSL* ssl, byte* out, const byte* input, word32 sz)
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}
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static INLINE void Decrypt(CYASSL* ssl, byte* plain, const byte* input,
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static INLINE int Decrypt(CYASSL* ssl, byte* plain, const byte* input,
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word32 sz)
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{
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switch (ssl->specs.bulk_cipher_algorithm) {
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@ -2226,6 +2291,41 @@ static INLINE void Decrypt(CYASSL* ssl, byte* plain, const byte* input,
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break;
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#endif
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#ifdef BUILD_AESGCM
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case aes_gcm:
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{
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byte additional[16];
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byte nonce[16];
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/* use the other side's IV */
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if (ssl->options.side == SERVER_END) {
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XMEMCPY(nonce, ssl->keys.client_write_IV,
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AES_GCM_IMPLICIT_IV_SIZE);
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}
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else {
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XMEMCPY(nonce, ssl->keys.server_write_IV,
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AES_GCM_IMPLICIT_IV_SIZE);
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}
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XMEMCPY(nonce + AES_GCM_IMPLICIT_IV_SIZE,
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input, AES_GCM_EXPLICIT_IV_SIZE);
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XMEMSET(nonce + AES_GCM_IMPLICIT_IV_SIZE +
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AES_GCM_EXPLICIT_IV_SIZE, 0, 4);
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AesSetIV(&ssl->decrypt.aes, nonce);
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XMEMSET(additional, 0, 4);
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c32toa(GetSEQIncrement(ssl, 1), additional + 4);
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additional[8] = ssl->curRL.type;
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additional[9] = ssl->curRL.version.major;
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additional[10] = ssl->curRL.version.minor;
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c16toa(sz, additional + 11);
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if (AesGcmDecrypt(&ssl->decrypt.aes, plain+8, input+8, sz-24,
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input + 8 + (sz - 24), 16, additional, 13) < 0) {
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SendAlert(ssl, alert_fatal, bad_record_mac);
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return VERIFY_MAC_ERROR;
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}
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break;
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}
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#endif
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#ifdef HAVE_HC128
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case hc128:
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Hc128_Process(&ssl->decrypt.hc128, plain, input, sz);
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@ -2241,27 +2341,25 @@ static INLINE void Decrypt(CYASSL* ssl, byte* plain, const byte* input,
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default:
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CYASSL_MSG("CyaSSL Decrypt programming error");
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}
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return 0;
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}
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/* decrypt input message in place */
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static int DecryptMessage(CYASSL* ssl, byte* input, word32 sz, word32* idx)
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{
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Decrypt(ssl, input, input, sz);
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ssl->keys.encryptSz = sz;
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if (ssl->options.tls1_1 && ssl->specs.cipher_type == block)
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*idx += ssl->specs.block_size; /* go past TLSv1.1 IV */
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int decryptResult = Decrypt(ssl, input, input, sz);
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return 0;
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}
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if (decryptResult == 0)
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{
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ssl->keys.encryptSz = sz;
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if (ssl->options.tls1_1 && ssl->specs.cipher_type == block)
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*idx += ssl->specs.block_size; /* go past TLSv1.1 IV */
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if (ssl->specs.cipher_type == aead)
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*idx += AES_GCM_EXPLICIT_IV_SIZE;
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}
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static INLINE word32 GetSEQIncrement(CYASSL* ssl, int verify)
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{
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if (verify)
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return ssl->keys.peer_sequence_number++;
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else
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return ssl->keys.sequence_number++;
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return decryptResult;
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}
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@ -2288,6 +2386,10 @@ int DoApplicationData(CYASSL* ssl, byte* input, word32* inOutIdx)
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pad = *(input + idx + msgSz - ivExtra - 1);
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padByte = 1;
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}
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if (ssl->specs.cipher_type == aead) {
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ivExtra = 8;
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digestSz = 16;
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}
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dataSz = msgSz - ivExtra - digestSz - pad - padByte;
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if (dataSz < 0) {
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@ -2299,7 +2401,8 @@ int DoApplicationData(CYASSL* ssl, byte* input, word32* inOutIdx)
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if (dataSz) {
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int rawSz = dataSz; /* keep raw size for hmac */
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ssl->hmac(ssl, verify, rawData, rawSz, application_data, 1);
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if (ssl->specs.cipher_type != aead)
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ssl->hmac(ssl, verify, rawData, rawSz, application_data, 1);
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#ifdef HAVE_LIBZ
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if (ssl->options.usingCompression) {
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@ -2332,7 +2435,7 @@ int DoApplicationData(CYASSL* ssl, byte* input, word32* inOutIdx)
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/* verify */
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if (dataSz) {
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if (XMEMCMP(mac, verify, digestSz)) {
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if (ssl->specs.cipher_type != aead && XMEMCMP(mac, verify, digestSz)) {
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CYASSL_MSG("App data verify mac error");
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return VERIFY_MAC_ERROR;
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}
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@ -2368,24 +2471,30 @@ static int DoAlert(CYASSL* ssl, byte* input, word32* inOutIdx, int* type)
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}
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CYASSL_ERROR(*type);
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if (ssl->keys.encryptionOn) {
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int aSz = ALERT_SIZE;
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const byte* mac;
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byte verify[SHA256_DIGEST_SIZE];
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int padSz = ssl->keys.encryptSz - aSz - ssl->specs.hash_size;
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ssl->hmac(ssl, verify, input + *inOutIdx - aSz, aSz, alert, 1);
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/* read mac and fill */
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mac = input + *inOutIdx;
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*inOutIdx += (ssl->specs.hash_size + padSz);
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/* verify */
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if (XMEMCMP(mac, verify, ssl->specs.hash_size)) {
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CYASSL_MSG(" alert verify mac error");
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return VERIFY_MAC_ERROR;
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}
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}
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if (ssl->keys.encryptionOn) {
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if (ssl->specs.cipher_type != aead) {
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int aSz = ALERT_SIZE;
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const byte* mac;
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byte verify[SHA256_DIGEST_SIZE];
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int padSz = ssl->keys.encryptSz - aSz - ssl->specs.hash_size;
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ssl->hmac(ssl, verify, input + *inOutIdx - aSz, aSz, alert, 1);
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/* read mac and fill */
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mac = input + *inOutIdx;
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*inOutIdx += (ssl->specs.hash_size + padSz);
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/* verify */
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if (XMEMCMP(mac, verify, ssl->specs.hash_size)) {
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CYASSL_MSG(" alert verify mac error");
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return VERIFY_MAC_ERROR;
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}
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}
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else {
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*inOutIdx += 16;
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/* XXX this should be a value out of the cipher specs */
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}
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}
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return level;
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}
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@ -2901,6 +3010,11 @@ static int BuildMessage(CYASSL* ssl, byte* output, const byte* input, int inSz,
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sz += pad;
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}
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if (ssl->specs.cipher_type == aead) {
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ivSz = AES_GCM_EXPLICIT_IV_SIZE;
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sz = sz + ivSz + 16 - digestSz;
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RNG_GenerateBlock(&ssl->rng, iv, ivSz);
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}
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size = (word16)(sz - headerSz); /* include mac and digest */
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AddRecordHeader(output, size, (byte)type, ssl);
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@ -2914,8 +3028,10 @@ static int BuildMessage(CYASSL* ssl, byte* output, const byte* input, int inSz,
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if (type == handshake)
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HashOutput(ssl, output, headerSz + inSz, ivSz);
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ssl->hmac(ssl, output+idx, output + headerSz + ivSz, inSz, type, 0);
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idx += digestSz;
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if (ssl->specs.cipher_type != aead) {
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ssl->hmac(ssl, output+idx, output + headerSz + ivSz, inSz, type, 0);
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idx += digestSz;
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}
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if (ssl->specs.cipher_type == block)
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for (i = 0; i <= pad; i++)
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src/keys.c
54
src/keys.c
@ -323,7 +323,7 @@ int SetCipherSpecs(CYASSL* ssl)
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ssl->specs.static_ecdh = 0;
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ssl->specs.key_size = AES_128_KEY_SIZE;
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ssl->specs.block_size = AES_BLOCK_SIZE;
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ssl->specs.iv_size = AES_IV_SIZE;
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ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
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break;
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#endif
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@ -340,7 +340,7 @@ int SetCipherSpecs(CYASSL* ssl)
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ssl->specs.static_ecdh = 0;
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ssl->specs.key_size = AES_256_KEY_SIZE;
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ssl->specs.block_size = AES_BLOCK_SIZE;
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ssl->specs.iv_size = AES_IV_SIZE;
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ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
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break;
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#endif
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@ -357,7 +357,7 @@ int SetCipherSpecs(CYASSL* ssl)
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ssl->specs.static_ecdh = 0;
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ssl->specs.key_size = AES_128_KEY_SIZE;
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ssl->specs.block_size = AES_BLOCK_SIZE;
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ssl->specs.iv_size = AES_IV_SIZE;
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ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
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break;
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#endif
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@ -374,7 +374,7 @@ int SetCipherSpecs(CYASSL* ssl)
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ssl->specs.static_ecdh = 0;
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ssl->specs.key_size = AES_256_KEY_SIZE;
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ssl->specs.block_size = AES_BLOCK_SIZE;
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ssl->specs.iv_size = AES_IV_SIZE;
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ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
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break;
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#endif
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@ -391,7 +391,7 @@ int SetCipherSpecs(CYASSL* ssl)
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ssl->specs.static_ecdh = 1;
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ssl->specs.key_size = AES_128_KEY_SIZE;
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ssl->specs.block_size = AES_BLOCK_SIZE;
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ssl->specs.iv_size = AES_IV_SIZE;
|
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ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -408,7 +408,7 @@ int SetCipherSpecs(CYASSL* ssl)
|
||||
ssl->specs.static_ecdh = 1;
|
||||
ssl->specs.key_size = AES_256_KEY_SIZE;
|
||||
ssl->specs.block_size = AES_BLOCK_SIZE;
|
||||
ssl->specs.iv_size = AES_IV_SIZE;
|
||||
ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -425,7 +425,7 @@ int SetCipherSpecs(CYASSL* ssl)
|
||||
ssl->specs.static_ecdh = 1;
|
||||
ssl->specs.key_size = AES_128_KEY_SIZE;
|
||||
ssl->specs.block_size = AES_BLOCK_SIZE;
|
||||
ssl->specs.iv_size = AES_IV_SIZE;
|
||||
ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -442,7 +442,7 @@ int SetCipherSpecs(CYASSL* ssl)
|
||||
ssl->specs.static_ecdh = 1;
|
||||
ssl->specs.key_size = AES_256_KEY_SIZE;
|
||||
ssl->specs.block_size = AES_BLOCK_SIZE;
|
||||
ssl->specs.iv_size = AES_IV_SIZE;
|
||||
ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -793,7 +793,7 @@ int SetCipherSpecs(CYASSL* ssl)
|
||||
ssl->specs.static_ecdh = 0;
|
||||
ssl->specs.key_size = AES_128_KEY_SIZE;
|
||||
ssl->specs.block_size = AES_BLOCK_SIZE;
|
||||
ssl->specs.iv_size = AES_IV_SIZE;
|
||||
ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -809,7 +809,7 @@ int SetCipherSpecs(CYASSL* ssl)
|
||||
ssl->specs.static_ecdh = 0;
|
||||
ssl->specs.key_size = AES_256_KEY_SIZE;
|
||||
ssl->specs.block_size = AES_BLOCK_SIZE;
|
||||
ssl->specs.iv_size = AES_IV_SIZE;
|
||||
ssl->specs.iv_size = AES_GCM_IMPLICIT_IV_SIZE;
|
||||
|
||||
break;
|
||||
#endif
|
||||
@ -970,6 +970,27 @@ static int SetKeys(Ciphers* enc, Ciphers* dec, Keys* keys, CipherSpecs* specs,
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef BUILD_AESGCM
|
||||
if (specs->bulk_cipher_algorithm == aes_gcm) {
|
||||
if (side == CLIENT_END) {
|
||||
AesSetKey(&enc->aes, keys->client_write_key,
|
||||
specs->key_size, keys->client_write_IV,
|
||||
AES_ENCRYPTION);
|
||||
AesSetKey(&dec->aes, keys->server_write_key,
|
||||
specs->key_size, keys->server_write_IV,
|
||||
AES_ENCRYPTION);
|
||||
}
|
||||
else {
|
||||
AesSetKey(&enc->aes, keys->server_write_key,
|
||||
specs->key_size, keys->server_write_IV,
|
||||
AES_ENCRYPTION);
|
||||
AesSetKey(&dec->aes, keys->client_write_key,
|
||||
specs->key_size, keys->client_write_IV,
|
||||
AES_ENCRYPTION);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
keys->sequence_number = 0;
|
||||
keys->peer_sequence_number = 0;
|
||||
keys->encryptionOn = 0;
|
||||
@ -983,10 +1004,15 @@ int StoreKeys(CYASSL* ssl, const byte* keyData)
|
||||
{
|
||||
int sz = ssl->specs.hash_size, i;
|
||||
|
||||
XMEMCPY(ssl->keys.client_write_MAC_secret, keyData, sz);
|
||||
i = sz;
|
||||
XMEMCPY(ssl->keys.server_write_MAC_secret,&keyData[i], sz);
|
||||
i += sz;
|
||||
if (ssl->specs.cipher_type != aead) {
|
||||
XMEMCPY(ssl->keys.client_write_MAC_secret, keyData, sz);
|
||||
i = sz;
|
||||
XMEMCPY(ssl->keys.server_write_MAC_secret,&keyData[i], sz);
|
||||
i += sz;
|
||||
}
|
||||
else {
|
||||
sz = 0;
|
||||
}
|
||||
|
||||
sz = ssl->specs.key_size;
|
||||
XMEMCPY(ssl->keys.client_write_key, &keyData[i], sz);
|
||||
|
Loading…
Reference in New Issue
Block a user