diff options
| -rw-r--r-- | crypto/cipher-builtin.c | 15 | ||||
| -rw-r--r-- | crypto/cipher-gcrypt.c | 61 | ||||
| -rw-r--r-- | crypto/cipher-nettle.c | 28 | ||||
| -rw-r--r-- | tests/test-crypto-cipher.c | 50 |
4 files changed, 130 insertions, 24 deletions
diff --git a/crypto/cipher-builtin.c b/crypto/cipher-builtin.c index 37e1a19..39e31a7 100644 --- a/crypto/cipher-builtin.c +++ b/crypto/cipher-builtin.c @@ -39,6 +39,7 @@ struct QCryptoCipherBuiltin { QCryptoCipherBuiltinAES aes; QCryptoCipherBuiltinDESRFB desrfb; } state; + size_t blocksize; void (*free)(QCryptoCipher *cipher); int (*setiv)(QCryptoCipher *cipher, const uint8_t *iv, size_t niv, @@ -181,6 +182,7 @@ static int qcrypto_cipher_init_aes(QCryptoCipher *cipher, goto error; } + ctxt->blocksize = AES_BLOCK_SIZE; ctxt->free = qcrypto_cipher_free_aes; ctxt->setiv = qcrypto_cipher_setiv_aes; ctxt->encrypt = qcrypto_cipher_encrypt_aes; @@ -282,6 +284,7 @@ static int qcrypto_cipher_init_des_rfb(QCryptoCipher *cipher, memcpy(ctxt->state.desrfb.key, key, nkey); ctxt->state.desrfb.nkey = nkey; + ctxt->blocksize = 8; ctxt->free = qcrypto_cipher_free_des_rfb; ctxt->setiv = qcrypto_cipher_setiv_des_rfb; ctxt->encrypt = qcrypto_cipher_encrypt_des_rfb; @@ -370,6 +373,12 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher, { QCryptoCipherBuiltin *ctxt = cipher->opaque; + if (len % ctxt->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctxt->blocksize); + return -1; + } + return ctxt->encrypt(cipher, in, out, len, errp); } @@ -382,6 +391,12 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher, { QCryptoCipherBuiltin *ctxt = cipher->opaque; + if (len % ctxt->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctxt->blocksize); + return -1; + } + return ctxt->decrypt(cipher, in, out, len, errp); } diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c index 8cfc562..c4f8114 100644 --- a/crypto/cipher-gcrypt.c +++ b/crypto/cipher-gcrypt.c @@ -34,6 +34,11 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg) } } +typedef struct QCryptoCipherGcrypt QCryptoCipherGcrypt; +struct QCryptoCipherGcrypt { + gcry_cipher_hd_t handle; + size_t blocksize; +}; QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, QCryptoCipherMode mode, @@ -41,7 +46,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, Error **errp) { QCryptoCipher *cipher; - gcry_cipher_hd_t handle; + QCryptoCipherGcrypt *ctx; gcry_error_t err; int gcryalg, gcrymode; @@ -87,7 +92,9 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, cipher->alg = alg; cipher->mode = mode; - err = gcry_cipher_open(&handle, gcryalg, gcrymode, 0); + ctx = g_new0(QCryptoCipherGcrypt, 1); + + err = gcry_cipher_open(&ctx->handle, gcryalg, gcrymode, 0); if (err != 0) { error_setg(errp, "Cannot initialize cipher: %s", gcry_strerror(err)); @@ -100,10 +107,12 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, * bizarre RFB variant of DES :-) */ uint8_t *rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey); - err = gcry_cipher_setkey(handle, rfbkey, nkey); + err = gcry_cipher_setkey(ctx->handle, rfbkey, nkey); g_free(rfbkey); + ctx->blocksize = 8; } else { - err = gcry_cipher_setkey(handle, key, nkey); + err = gcry_cipher_setkey(ctx->handle, key, nkey); + ctx->blocksize = 16; } if (err != 0) { error_setg(errp, "Cannot set key: %s", @@ -111,11 +120,12 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, goto error; } - cipher->opaque = handle; + cipher->opaque = ctx; return cipher; error: - gcry_cipher_close(handle); + gcry_cipher_close(ctx->handle); + g_free(ctx); g_free(cipher); return NULL; } @@ -123,12 +133,13 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, void qcrypto_cipher_free(QCryptoCipher *cipher) { - gcry_cipher_hd_t handle; + QCryptoCipherGcrypt *ctx; if (!cipher) { return; } - handle = cipher->opaque; - gcry_cipher_close(handle); + ctx = cipher->opaque; + gcry_cipher_close(ctx->handle); + g_free(ctx); g_free(cipher); } @@ -139,10 +150,16 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher, size_t len, Error **errp) { - gcry_cipher_hd_t handle = cipher->opaque; + QCryptoCipherGcrypt *ctx = cipher->opaque; gcry_error_t err; - err = gcry_cipher_encrypt(handle, + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + + err = gcry_cipher_encrypt(ctx->handle, out, len, in, len); if (err != 0) { @@ -161,10 +178,16 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher, size_t len, Error **errp) { - gcry_cipher_hd_t handle = cipher->opaque; + QCryptoCipherGcrypt *ctx = cipher->opaque; gcry_error_t err; - err = gcry_cipher_decrypt(handle, + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + + err = gcry_cipher_decrypt(ctx->handle, out, len, in, len); if (err != 0) { @@ -180,11 +203,17 @@ int qcrypto_cipher_setiv(QCryptoCipher *cipher, const uint8_t *iv, size_t niv, Error **errp) { - gcry_cipher_hd_t handle = cipher->opaque; + QCryptoCipherGcrypt *ctx = cipher->opaque; gcry_error_t err; - gcry_cipher_reset(handle); - err = gcry_cipher_setiv(handle, iv, niv); + if (niv != ctx->blocksize) { + error_setg(errp, "Expected IV size %zu not %zu", + ctx->blocksize, niv); + return -1; + } + + gcry_cipher_reset(ctx->handle); + err = gcry_cipher_setiv(ctx->handle, iv, niv); if (err != 0) { error_setg(errp, "Cannot set IV: %s", gcry_strerror(err)); diff --git a/crypto/cipher-nettle.c b/crypto/cipher-nettle.c index b01cb1c..7449338 100644 --- a/crypto/cipher-nettle.c +++ b/crypto/cipher-nettle.c @@ -69,7 +69,7 @@ struct QCryptoCipherNettle { nettle_cipher_func *alg_encrypt; nettle_cipher_func *alg_decrypt; uint8_t *iv; - size_t niv; + size_t blocksize; }; bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg) @@ -125,7 +125,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, ctx->alg_encrypt = des_encrypt_wrapper; ctx->alg_decrypt = des_decrypt_wrapper; - ctx->niv = DES_BLOCK_SIZE; + ctx->blocksize = DES_BLOCK_SIZE; break; case QCRYPTO_CIPHER_ALG_AES_128: @@ -140,14 +140,14 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg, ctx->alg_encrypt = aes_encrypt_wrapper; ctx->alg_decrypt = aes_decrypt_wrapper; - ctx->niv = AES_BLOCK_SIZE; + ctx->blocksize = AES_BLOCK_SIZE; break; default: error_setg(errp, "Unsupported cipher algorithm %d", alg); goto error; } - ctx->iv = g_new0(uint8_t, ctx->niv); + ctx->iv = g_new0(uint8_t, ctx->blocksize); cipher->opaque = ctx; return cipher; @@ -184,6 +184,12 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher, { QCryptoCipherNettle *ctx = cipher->opaque; + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + switch (cipher->mode) { case QCRYPTO_CIPHER_MODE_ECB: ctx->alg_encrypt(ctx->ctx_encrypt, len, out, in); @@ -191,7 +197,7 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher, case QCRYPTO_CIPHER_MODE_CBC: cbc_encrypt(ctx->ctx_encrypt, ctx->alg_encrypt, - ctx->niv, ctx->iv, + ctx->blocksize, ctx->iv, len, out, in); break; default: @@ -211,6 +217,12 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher, { QCryptoCipherNettle *ctx = cipher->opaque; + if (len % ctx->blocksize) { + error_setg(errp, "Length %zu must be a multiple of block size %zu", + len, ctx->blocksize); + return -1; + } + switch (cipher->mode) { case QCRYPTO_CIPHER_MODE_ECB: ctx->alg_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt, @@ -219,7 +231,7 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher, case QCRYPTO_CIPHER_MODE_CBC: cbc_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt, - ctx->alg_decrypt, ctx->niv, ctx->iv, + ctx->alg_decrypt, ctx->blocksize, ctx->iv, len, out, in); break; default: @@ -235,9 +247,9 @@ int qcrypto_cipher_setiv(QCryptoCipher *cipher, Error **errp) { QCryptoCipherNettle *ctx = cipher->opaque; - if (niv != ctx->niv) { + if (niv != ctx->blocksize) { error_setg(errp, "Expected IV size %zu not %zu", - ctx->niv, niv); + ctx->blocksize, niv); return -1; } memcpy(ctx->iv, iv, niv); diff --git a/tests/test-crypto-cipher.c b/tests/test-crypto-cipher.c index 1b60c34..f4946a0 100644 --- a/tests/test-crypto-cipher.c +++ b/tests/test-crypto-cipher.c @@ -313,6 +313,53 @@ static void test_cipher_null_iv(void) qcrypto_cipher_free(cipher); } +static void test_cipher_short_plaintext(void) +{ + Error *err = NULL; + QCryptoCipher *cipher; + uint8_t key[32] = { 0 }; + uint8_t plaintext1[20] = { 0 }; + uint8_t ciphertext1[20] = { 0 }; + uint8_t plaintext2[40] = { 0 }; + uint8_t ciphertext2[40] = { 0 }; + int ret; + + cipher = qcrypto_cipher_new( + QCRYPTO_CIPHER_ALG_AES_256, + QCRYPTO_CIPHER_MODE_CBC, + key, sizeof(key), + &error_abort); + g_assert(cipher != NULL); + + /* Should report an error as plaintext is shorter + * than block size + */ + ret = qcrypto_cipher_encrypt(cipher, + plaintext1, + ciphertext1, + sizeof(plaintext1), + &err); + g_assert(ret == -1); + g_assert(err != NULL); + + error_free(err); + err = NULL; + + /* Should report an error as plaintext is larger than + * block size, but not a multiple of block size + */ + ret = qcrypto_cipher_encrypt(cipher, + plaintext2, + ciphertext2, + sizeof(plaintext2), + &err); + g_assert(ret == -1); + g_assert(err != NULL); + + error_free(err); + qcrypto_cipher_free(cipher); +} + int main(int argc, char **argv) { size_t i; @@ -328,5 +375,8 @@ int main(int argc, char **argv) g_test_add_func("/crypto/cipher/null-iv", test_cipher_null_iv); + g_test_add_func("/crypto/cipher/short-plaintext", + test_cipher_short_plaintext); + return g_test_run(); } |