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crypto: add a nettle cipher implementation
If we are linking to gnutls already and gnutls is built against nettle, then we should use nettle as a cipher backend in preference to our built-in backend. This will be used when linking against some GNUTLS 2.x versions and all GNUTLS 3.x versions. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1435770638-25715-7-git-send-email-berrange@redhat.com> [Change "#elif" to "#elif defined". - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,206 @@ | ||
| /* | ||
| * QEMU Crypto cipher nettle algorithms | ||
| * | ||
| * Copyright (c) 2015 Red Hat, Inc. | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2 of the License, or (at your option) any later version. | ||
| * | ||
| * This library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
|
||
| #include <nettle/nettle-types.h> | ||
| #include <nettle/aes.h> | ||
| #include <nettle/des.h> | ||
| #include <nettle/cbc.h> | ||
|
|
||
| typedef struct QCryptoCipherNettle QCryptoCipherNettle; | ||
| struct QCryptoCipherNettle { | ||
| void *ctx_encrypt; | ||
| void *ctx_decrypt; | ||
| nettle_crypt_func *alg_encrypt; | ||
| nettle_crypt_func *alg_decrypt; | ||
| uint8_t *iv; | ||
| size_t niv; | ||
| }; | ||
|
|
||
| bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg) | ||
| { | ||
| switch (alg) { | ||
| case QCRYPTO_CIPHER_ALG_DES_RFB: | ||
| case QCRYPTO_CIPHER_ALG_AES_128: | ||
| case QCRYPTO_CIPHER_ALG_AES_192: | ||
| case QCRYPTO_CIPHER_ALG_AES_256: | ||
| return true; | ||
| default: | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
|
|
||
| QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, | ||
| QCryptoCipherMode mode, | ||
| const uint8_t *key, size_t nkey, | ||
| Error **errp) | ||
| { | ||
| QCryptoCipher *cipher; | ||
| QCryptoCipherNettle *ctx; | ||
| uint8_t *rfbkey; | ||
|
|
||
| switch (mode) { | ||
| case QCRYPTO_CIPHER_MODE_ECB: | ||
| case QCRYPTO_CIPHER_MODE_CBC: | ||
| break; | ||
| default: | ||
| error_setg(errp, "Unsupported cipher mode %d", mode); | ||
| return NULL; | ||
| } | ||
|
|
||
| if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) { | ||
| return NULL; | ||
| } | ||
|
|
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| cipher = g_new0(QCryptoCipher, 1); | ||
| cipher->alg = alg; | ||
| cipher->mode = mode; | ||
|
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| ctx = g_new0(QCryptoCipherNettle, 1); | ||
|
|
||
| switch (alg) { | ||
| case QCRYPTO_CIPHER_ALG_DES_RFB: | ||
| ctx->ctx_encrypt = g_new0(struct des_ctx, 1); | ||
| ctx->ctx_decrypt = NULL; /* 1 ctx can do both */ | ||
| rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey); | ||
| des_set_key(ctx->ctx_encrypt, rfbkey); | ||
| g_free(rfbkey); | ||
|
|
||
| ctx->alg_encrypt = (nettle_crypt_func *)des_encrypt; | ||
| ctx->alg_decrypt = (nettle_crypt_func *)des_decrypt; | ||
|
|
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| ctx->niv = DES_BLOCK_SIZE; | ||
| break; | ||
|
|
||
| case QCRYPTO_CIPHER_ALG_AES_128: | ||
| case QCRYPTO_CIPHER_ALG_AES_192: | ||
| case QCRYPTO_CIPHER_ALG_AES_256: | ||
| ctx->ctx_encrypt = g_new0(struct aes_ctx, 1); | ||
| ctx->ctx_decrypt = g_new0(struct aes_ctx, 1); | ||
|
|
||
| aes_set_encrypt_key(ctx->ctx_encrypt, nkey, key); | ||
| aes_set_decrypt_key(ctx->ctx_decrypt, nkey, key); | ||
|
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| ctx->alg_encrypt = (nettle_crypt_func *)aes_encrypt; | ||
| ctx->alg_decrypt = (nettle_crypt_func *)aes_decrypt; | ||
|
|
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| ctx->niv = AES_BLOCK_SIZE; | ||
| break; | ||
| default: | ||
| error_setg(errp, "Unsupported cipher algorithm %d", alg); | ||
| goto error; | ||
| } | ||
|
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| ctx->iv = g_new0(uint8_t, ctx->niv); | ||
| cipher->opaque = ctx; | ||
|
|
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| return cipher; | ||
|
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||
| error: | ||
| g_free(cipher); | ||
| g_free(ctx); | ||
| return NULL; | ||
| } | ||
|
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|
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| void qcrypto_cipher_free(QCryptoCipher *cipher) | ||
| { | ||
| QCryptoCipherNettle *ctx; | ||
|
|
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| if (!cipher) { | ||
| return; | ||
| } | ||
|
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| ctx = cipher->opaque; | ||
| g_free(ctx->iv); | ||
| g_free(ctx->ctx_encrypt); | ||
| g_free(ctx->ctx_decrypt); | ||
| g_free(ctx); | ||
| g_free(cipher); | ||
| } | ||
|
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|
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| int qcrypto_cipher_encrypt(QCryptoCipher *cipher, | ||
| const void *in, | ||
| void *out, | ||
| size_t len, | ||
| Error **errp) | ||
| { | ||
| QCryptoCipherNettle *ctx = cipher->opaque; | ||
|
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| switch (cipher->mode) { | ||
| case QCRYPTO_CIPHER_MODE_ECB: | ||
| ctx->alg_encrypt(ctx->ctx_encrypt, len, out, in); | ||
| break; | ||
|
|
||
| case QCRYPTO_CIPHER_MODE_CBC: | ||
| cbc_encrypt(ctx->ctx_encrypt, ctx->alg_encrypt, | ||
| ctx->niv, ctx->iv, | ||
| len, out, in); | ||
| break; | ||
| default: | ||
| error_setg(errp, "Unsupported cipher algorithm %d", | ||
| cipher->alg); | ||
| return -1; | ||
| } | ||
| return 0; | ||
| } | ||
|
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|
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| int qcrypto_cipher_decrypt(QCryptoCipher *cipher, | ||
| const void *in, | ||
| void *out, | ||
| size_t len, | ||
| Error **errp) | ||
| { | ||
| QCryptoCipherNettle *ctx = cipher->opaque; | ||
|
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| switch (cipher->mode) { | ||
| case QCRYPTO_CIPHER_MODE_ECB: | ||
| ctx->alg_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt, | ||
| len, out, in); | ||
| break; | ||
|
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||
| case QCRYPTO_CIPHER_MODE_CBC: | ||
| cbc_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt, | ||
| ctx->alg_decrypt, ctx->niv, ctx->iv, | ||
| len, out, in); | ||
| break; | ||
| default: | ||
| error_setg(errp, "Unsupported cipher algorithm %d", | ||
| cipher->alg); | ||
| return -1; | ||
| } | ||
| return 0; | ||
| } | ||
|
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||
| int qcrypto_cipher_setiv(QCryptoCipher *cipher, | ||
| const uint8_t *iv, size_t niv, | ||
| Error **errp) | ||
| { | ||
| QCryptoCipherNettle *ctx = cipher->opaque; | ||
| if (niv != ctx->niv) { | ||
| error_setg(errp, "Expected IV size %zu not %zu", | ||
| ctx->niv, niv); | ||
| return -1; | ||
| } | ||
| memcpy(ctx->iv, iv, niv); | ||
| return 0; | ||
| } |
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