crypto: Add RSA and AES-EAX
Andri Yngvason
parent
7b878033f0
commit
c12c1c800a
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@ -7,20 +7,25 @@
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struct crypto_key;
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struct crypto_cipher;
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struct crypto_hash;
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struct crypto_rsa_pub_key;
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struct crypto_rsa_priv_key;
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enum crypto_cipher_type {
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CRYPTO_CIPHER_INVALID = 0,
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CRYPTO_CIPHER_AES128_ECB,
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CRYPTO_CIPHER_AES_EAX,
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};
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enum crypto_hash_type {
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CRYPTO_HASH_INVALID = 0,
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CRYPTO_HASH_MD5,
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CRYPTO_HASH_SHA1,
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};
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void crypto_dump_base16(const char* msg, const uint8_t* bytes, size_t len);
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void crypto_dump_base64(const char* msg, const uint8_t* bytes, size_t len);
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void crypto_cleanup(void);
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void crypto_random(uint8_t* dst, size_t len);
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// Key generation
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struct crypto_key* crypto_key_new(int g, const uint8_t *p, uint32_t p_len,
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@ -42,8 +47,8 @@ struct crypto_key* crypto_derive_shared_secret(
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const struct crypto_key* remote_public_key);
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// Ciphers
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struct crypto_cipher* crypto_cipher_new(const uint8_t* key,
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enum crypto_cipher_type type);
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struct crypto_cipher* crypto_cipher_new(const uint8_t* enc_key,
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const uint8_t* dec_key, enum crypto_cipher_type type);
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void crypto_cipher_del(struct crypto_cipher* self);
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bool crypto_cipher_encrypt(struct crypto_cipher* self, uint8_t* dst,
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@ -51,6 +56,11 @@ bool crypto_cipher_encrypt(struct crypto_cipher* self, uint8_t* dst,
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bool crypto_cipher_decrypt(struct crypto_cipher* self, uint8_t* dst,
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const uint8_t* src, size_t len);
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void crypto_cipher_set_ad(struct crypto_cipher* self, const uint8_t* ad,
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size_t len);
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void crypto_cipher_get_mac(struct crypto_cipher* self, uint8_t* dst,
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size_t size);
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// Hashing
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struct crypto_hash* crypto_hash_new(enum crypto_hash_type type);
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void crypto_hash_del(struct crypto_hash* self);
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@ -59,3 +69,25 @@ void crypto_hash_append(struct crypto_hash* self, const uint8_t* src,
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size_t len);
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void crypto_hash_digest(struct crypto_hash* self, uint8_t* dst,
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size_t len);
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// RSA
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struct crypto_rsa_pub_key* crypto_rsa_pub_key_new(void);
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void crypto_rsa_pub_key_del(struct crypto_rsa_pub_key*);
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struct crypto_rsa_pub_key* crypto_rsa_pub_key_import(const uint8_t* modulus,
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const uint8_t* exponent, size_t size);
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void crypto_rsa_pub_key_modulus(const struct crypto_rsa_pub_key* key,
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uint8_t* dst, size_t dst_size);
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void crypto_rsa_pub_key_exponent(const struct crypto_rsa_pub_key* key,
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uint8_t* dst, size_t dst_size);
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struct crypto_rsa_priv_key *crypto_rsa_priv_key_new(void);
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void crypto_rsa_priv_key_del(struct crypto_rsa_priv_key*);
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bool crypto_rsa_keygen(struct crypto_rsa_pub_key*, struct crypto_rsa_priv_key*);
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ssize_t crypto_rsa_encrypt(struct crypto_rsa_pub_key* pub, uint8_t* dst,
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size_t dst_size, const uint8_t* src, size_t src_size);
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ssize_t crypto_rsa_decrypt(struct crypto_rsa_priv_key* priv, uint8_t* dst,
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size_t dst_size, const uint8_t* src, size_t src_size);
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@ -51,6 +51,7 @@ pixman = dependency('pixman-1')
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libturbojpeg = dependency('libturbojpeg', required: get_option('jpeg'))
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gnutls = dependency('gnutls', required: get_option('tls'))
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nettle = dependency('nettle', required: get_option('nettle'))
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hogweed = dependency('hogweed', required: get_option('nettle'))
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gmp = dependency('gmp', required: get_option('nettle'))
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zlib = dependency('zlib')
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gbm = dependency('gbm', required: get_option('gbm'))
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@ -119,8 +120,8 @@ if gnutls.found()
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config.set('ENABLE_TLS', true)
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endif
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if nettle.found() and gmp.found()
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dependencies += [ nettle, gmp ]
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if nettle.found() and hogweed.found() and gmp.found()
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dependencies += [ nettle, hogweed, gmp ]
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enable_websocket = true
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config.set('HAVE_CRYPTO', true)
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sources += 'src/crypto-nettle.c'
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@ -5,11 +5,16 @@
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#include <nettle/base64.h>
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#include <nettle/base16.h>
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#include <nettle/aes.h>
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#include <nettle/eax.h>
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#include <nettle/md5.h>
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#include <nettle/sha1.h>
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#include <nettle/rsa.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/param.h>
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// TODO: This is linux specific
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#include <sys/random.h>
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@ -20,15 +25,27 @@ struct crypto_key {
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mpz_t q;
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};
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struct crypto_aes_eax {
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struct eax_aes128_ctx ctx;
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uint64_t count[2];
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};
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struct crypto_cipher {
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union {
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struct aes128_ctx aes128_ecb;
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struct crypto_aes_eax aes_eax;
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} enc_ctx;
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union {
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struct aes128_ctx aes128_ecb;
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struct crypto_aes_eax aes_eax;
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} dec_ctx;
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const uint8_t* ad;
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size_t ad_len;
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uint8_t mac[16];
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bool (*encrypt)(struct crypto_cipher*, uint8_t* dst, const uint8_t* src,
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size_t len);
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bool (*decrypt)(struct crypto_cipher*, uint8_t* dst, const uint8_t* src,
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@ -38,26 +55,62 @@ struct crypto_cipher {
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struct crypto_hash {
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union {
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struct md5_ctx md5;
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struct sha1_ctx sha1;
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} ctx;
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void (*update)(void* ctx, size_t len, const uint8_t* src);
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void (*digest)(void* ctx, size_t len, uint8_t* dst);
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};
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struct crypto_rsa_pub_key {
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struct rsa_public_key key;
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};
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struct crypto_rsa_priv_key {
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struct rsa_private_key key;
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};
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void crypto_dump_base64(const char* msg, const uint8_t* bytes, size_t len)
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{
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struct base64_encode_ctx ctx = {};
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size_t buflen = BASE64_ENCODE_LENGTH(len);
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char* buffer = malloc(buflen + BASE64_ENCODE_FINAL_LENGTH);
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char* buffer = malloc(buflen + BASE64_ENCODE_FINAL_LENGTH + 1);
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assert(buffer);
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nettle_base64_encode_init(&ctx);
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nettle_base64_encode_update(&ctx, buffer, len, bytes);
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nettle_base64_encode_final(&ctx, buffer + buflen);
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size_t count = nettle_base64_encode_update(&ctx, buffer, len, bytes);
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count += nettle_base64_encode_final(&ctx, buffer + count);
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buffer[count] = '\0';
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nvnc_log(NVNC_LOG_DEBUG, "%s: %s", msg, buffer);
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free(buffer);
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}
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void crypto_dump_base16(const char* msg, const uint8_t* bytes, size_t len)
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{
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size_t buflen = BASE16_ENCODE_LENGTH(len);
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char* buffer = calloc(1, buflen + 1);
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assert(buffer);
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nettle_base16_encode_update(buffer, len, bytes);
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nvnc_log(NVNC_LOG_DEBUG, "%s: %s", msg, buffer);
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free(buffer);
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}
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void crypto_random(uint8_t* dst, size_t len)
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{
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getrandom(dst, len, 0);
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}
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static void crypto_import(mpz_t n, const uint8_t* src, size_t len)
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{
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int order = 1;
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int unit_size = 1;
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int endian = 1;
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int skip_bits = 0;
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mpz_import(n, len, order, unit_size, endian, skip_bits, src);
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}
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struct crypto_key *crypto_key_new(int g, const uint8_t* p, uint32_t p_len,
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const uint8_t* q, uint32_t q_len)
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{
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@ -67,16 +120,11 @@ struct crypto_key *crypto_key_new(int g, const uint8_t* p, uint32_t p_len,
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self->g = g;
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int order = 1;
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int unit_size = 1;
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int endian = 1;
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int skip_bits = 0;
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mpz_init(self->p);
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mpz_import(self->p, p_len, order, unit_size, endian, skip_bits, p);
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crypto_import(self->p, p, p_len);
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mpz_init(self->q);
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mpz_import(self->q, q_len, order, unit_size, endian, skip_bits, q);
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crypto_import(self->q, q, q_len);
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return self;
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}
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@ -93,32 +141,34 @@ int crypto_key_g(const struct crypto_key* key)
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return key->g;
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}
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uint32_t crypto_key_p(const struct crypto_key* key, uint8_t* dst,
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uint32_t dst_size)
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static size_t crypto_export(uint8_t* dst, size_t dst_size, const mpz_t n)
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{
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int order = 1; // msb first
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int unit_size = 1; // byte
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int endian = 1; // msb first
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int skip_bits = 0;
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size_t len = 0;
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mpz_export(dst, &len, order, unit_size, endian, skip_bits, key->p);
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size_t bitsize = mpz_sizeinbase(n, 2);
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size_t bytesize = (bitsize + 7) / 8;
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return len;
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assert(bytesize <= dst_size);
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mpz_export(dst + dst_size - bytesize, &bytesize, order, unit_size,
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endian, skip_bits, n);
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return bytesize;
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}
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uint32_t crypto_key_p(const struct crypto_key* key, uint8_t* dst,
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uint32_t dst_size)
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{
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return crypto_export(dst, dst_size, key->p);
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}
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uint32_t crypto_key_q(const struct crypto_key* key, uint8_t* dst,
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uint32_t dst_size)
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{
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int order = 1; // msb first
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int unit_size = 1; // byte
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int endian = 1; // msb first
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int skip_bits = 0;
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size_t len = 0;
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mpz_export(dst, &len, order, unit_size, endian, skip_bits, key->q);
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return len;
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return crypto_export(dst, dst_size, key->q);
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}
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static void initialise_p(mpz_t p)
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@ -145,25 +195,14 @@ static void initialise_p(mpz_t p)
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nettle_base16_decode_final(&ctx);
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assert(len == sizeof(buf));
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int order = 1;
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int unit_size = 1;
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int endian = 1;
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int skip_bits = 0;
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mpz_import(p, sizeof(buf), order, unit_size, endian, skip_bits, buf);
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crypto_import(p, (const uint8_t*)buf, sizeof(buf));
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}
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static void generate_random(mpz_t n)
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{
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uint8_t buf[256];
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getrandom(buf, sizeof(buf), 0);
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int order = 1;
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int unit_size = 1;
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int endian = 1;
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int skip_bits = 0;
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mpz_import(n, sizeof(buf), order, unit_size, endian, skip_bits, buf);
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crypto_import(n, buf, sizeof(buf));
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}
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struct crypto_key* crypto_keygen(void)
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@ -247,14 +286,18 @@ static bool crypto_cipher_aes128_ecb_decrypt(struct crypto_cipher* self,
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return true;
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}
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static struct crypto_cipher* crypto_cipher_new_aes128_ecb(const uint8_t* key)
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static struct crypto_cipher* crypto_cipher_new_aes128_ecb(
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const uint8_t* enc_key, const uint8_t* dec_key)
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{
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struct crypto_cipher* self = calloc(1, sizeof(*self));
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if (!self)
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return NULL;
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aes128_set_encrypt_key(&self->enc_ctx.aes128_ecb, key);
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aes128_invert_key(&self->dec_ctx.aes128_ecb, &self->enc_ctx.aes128_ecb);
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if (enc_key)
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aes128_set_encrypt_key(&self->enc_ctx.aes128_ecb, enc_key);
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if (dec_key)
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aes128_set_decrypt_key(&self->enc_ctx.aes128_ecb, dec_key);
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self->encrypt = crypto_cipher_aes128_ecb_encrypt;
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self->decrypt = crypto_cipher_aes128_ecb_decrypt;
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@ -262,12 +305,78 @@ static struct crypto_cipher* crypto_cipher_new_aes128_ecb(const uint8_t* key)
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return self;
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}
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struct crypto_cipher* crypto_cipher_new(const uint8_t* key,
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enum crypto_cipher_type type)
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static void crypto_aes_eax_update_nonce(struct crypto_aes_eax* self)
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{
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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nettle_eax_aes128_set_nonce(&self->ctx, 16, (const uint8_t*)self->count);
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#else
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uint64_t c[2];
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c[0] = __builtin_bswap64(self->count[0]);
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c[1] = __builtin_bswap64(self->count[1]);
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nettle_eax_aes128_set_nonce(&self->ctx, 16, (const uint8_t*)c);
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#endif
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if (++self->count[0] == 0)
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++self->count[1];
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}
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static bool crypto_cipher_aes_eax_encrypt(struct crypto_cipher* self,
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uint8_t* dst, const uint8_t* src, size_t len)
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{
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crypto_aes_eax_update_nonce(&self->enc_ctx.aes_eax);
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if (self->ad) {
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nettle_eax_aes128_update(&self->enc_ctx.aes_eax.ctx,
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self->ad_len, self->ad);
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} else {
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nettle_eax_aes128_update(&self->enc_ctx.aes_eax.ctx, 0, NULL);
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}
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nettle_eax_aes128_encrypt(&self->enc_ctx.aes_eax.ctx, len, dst, src);
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nettle_eax_aes128_digest(&self->enc_ctx.aes_eax.ctx, 16, self->mac);
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return true;
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}
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static bool crypto_cipher_aes_eax_decrypt(struct crypto_cipher* self,
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uint8_t* dst, const uint8_t* src, size_t len)
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{
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crypto_aes_eax_update_nonce(&self->dec_ctx.aes_eax);
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if (self->ad) {
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nettle_eax_aes128_update(&self->dec_ctx.aes_eax.ctx,
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self->ad_len, self->ad);
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} else {
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nettle_eax_aes128_update(&self->dec_ctx.aes_eax.ctx, 0, NULL);
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}
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nettle_eax_aes128_decrypt(&self->dec_ctx.aes_eax.ctx, len, dst, src);
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nettle_eax_aes128_digest(&self->dec_ctx.aes_eax.ctx, 16, self->mac);
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return true;
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}
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static struct crypto_cipher* crypto_cipher_new_aes_eax(const uint8_t* enc_key,
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const uint8_t* dec_key)
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{
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struct crypto_cipher* self = calloc(1, sizeof(*self));
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if (!self)
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return NULL;
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eax_aes128_set_key(&self->enc_ctx.aes_eax.ctx, enc_key);
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eax_aes128_set_key(&self->dec_ctx.aes_eax.ctx, dec_key);
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self->encrypt = crypto_cipher_aes_eax_encrypt;
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self->decrypt = crypto_cipher_aes_eax_decrypt;
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return self;
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}
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struct crypto_cipher* crypto_cipher_new(const uint8_t* enc_key,
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const uint8_t* dec_key, enum crypto_cipher_type type)
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{
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switch (type) {
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case CRYPTO_CIPHER_AES128_ECB:
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return crypto_cipher_new_aes128_ecb(key);
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return crypto_cipher_new_aes128_ecb(enc_key, dec_key);
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case CRYPTO_CIPHER_AES_EAX:
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return crypto_cipher_new_aes_eax(enc_key, dec_key);
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case CRYPTO_CIPHER_INVALID:
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break;
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}
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@ -293,15 +402,41 @@ bool crypto_cipher_decrypt(struct crypto_cipher* self, uint8_t* dst,
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return self->decrypt(self, dst, src, len);
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}
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void crypto_cipher_set_ad(struct crypto_cipher* self, const uint8_t* ad,
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size_t len)
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{
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self->ad = ad;
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self->ad_len = len;
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}
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void crypto_cipher_get_mac(struct crypto_cipher* self, uint8_t* dst,
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size_t size)
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{
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size_t common_size = MIN(sizeof(self->mac), size);
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memcpy(dst, self->mac, common_size);
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}
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struct crypto_hash* crypto_hash_new(enum crypto_hash_type type)
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{
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struct crypto_hash* self = calloc(1, sizeof(*self));
|
||||
if (!self)
|
||||
return NULL;
|
||||
|
||||
switch (type) {
|
||||
case CRYPTO_HASH_INVALID:
|
||||
nvnc_log(NVNC_LOG_PANIC, "Invalid hash type");
|
||||
break;
|
||||
case CRYPTO_HASH_MD5:
|
||||
md5_init(&self->ctx.md5);
|
||||
self->update = (void*)nettle_md5_update;
|
||||
self->digest = (void*)nettle_md5_digest;
|
||||
break;
|
||||
case CRYPTO_HASH_SHA1:
|
||||
sha1_init(&self->ctx.sha1);
|
||||
self->update = (void*)nettle_sha1_update;
|
||||
self->digest = (void*)nettle_sha1_digest;
|
||||
break;
|
||||
}
|
||||
|
||||
return self;
|
||||
}
|
||||
|
|
@ -321,3 +456,110 @@ void crypto_hash_digest(struct crypto_hash* self, uint8_t* dst, size_t len)
|
|||
{
|
||||
self->digest(&self->ctx, len, dst);
|
||||
}
|
||||
|
||||
struct crypto_rsa_pub_key *crypto_rsa_pub_key_new(void)
|
||||
{
|
||||
struct crypto_rsa_pub_key* self = calloc(1, sizeof(*self));
|
||||
if (!self)
|
||||
return NULL;
|
||||
|
||||
rsa_public_key_init(&self->key);
|
||||
return self;
|
||||
}
|
||||
|
||||
void crypto_rsa_pub_key_del(struct crypto_rsa_pub_key* self)
|
||||
{
|
||||
rsa_public_key_clear(&self->key);
|
||||
free(self);
|
||||
}
|
||||
|
||||
struct crypto_rsa_pub_key* crypto_rsa_pub_key_import(const uint8_t* modulus,
|
||||
const uint8_t* exponent, size_t size)
|
||||
{
|
||||
struct crypto_rsa_pub_key* self = crypto_rsa_pub_key_new();
|
||||
if (!self)
|
||||
return NULL;
|
||||
|
||||
crypto_import(self->key.n, modulus, size);
|
||||
crypto_import(self->key.e, exponent, size);
|
||||
self->key.size = rsa_public_key_prepare(&self->key);
|
||||
|
||||
return self;
|
||||
}
|
||||
|
||||
void crypto_rsa_pub_key_modulus(const struct crypto_rsa_pub_key* key,
|
||||
uint8_t* dst, size_t dst_size)
|
||||
{
|
||||
crypto_export(dst, dst_size, key->key.n);
|
||||
}
|
||||
|
||||
void crypto_rsa_pub_key_exponent(const struct crypto_rsa_pub_key* key,
|
||||
uint8_t* dst, size_t dst_size)
|
||||
{
|
||||
char* str = mpz_get_str(NULL, 16, key->key.e);
|
||||
nvnc_trace("e: %s", str);
|
||||
free(str);
|
||||
|
||||
crypto_export(dst, dst_size, key->key.e);
|
||||
}
|
||||
|
||||
struct crypto_rsa_priv_key *crypto_rsa_priv_key_new(void)
|
||||
{
|
||||
struct crypto_rsa_priv_key* self = calloc(1, sizeof(*self));
|
||||
if (!self)
|
||||
return NULL;
|
||||
|
||||
rsa_private_key_init(&self->key);
|
||||
return self;
|
||||
}
|
||||
|
||||
void crypto_rsa_priv_key_del(struct crypto_rsa_priv_key* self)
|
||||
{
|
||||
rsa_private_key_clear(&self->key);
|
||||
free(self);
|
||||
}
|
||||
|
||||
static void generate_random_for_rsa(void* random_ctx, size_t len, uint8_t* dst)
|
||||
{
|
||||
getrandom(dst, len, 0);
|
||||
}
|
||||
|
||||
bool crypto_rsa_keygen(struct crypto_rsa_pub_key* pub,
|
||||
struct crypto_rsa_priv_key* priv)
|
||||
{
|
||||
void* random_ctx = NULL;
|
||||
nettle_random_func* random_func = generate_random_for_rsa;
|
||||
void* progress_ctx = NULL;
|
||||
nettle_progress_func* progress = NULL;
|
||||
|
||||
int rc = rsa_generate_keypair(&pub->key, &priv->key, random_ctx,
|
||||
random_func, progress_ctx, progress, 2048, 30);
|
||||
return rc != 0;
|
||||
}
|
||||
|
||||
ssize_t crypto_rsa_encrypt(struct crypto_rsa_pub_key* pub, uint8_t* dst,
|
||||
size_t dst_size, const uint8_t* src, size_t src_size)
|
||||
{
|
||||
mpz_t ciphertext;
|
||||
mpz_init(ciphertext);
|
||||
int r = rsa_encrypt(&pub->key, NULL, generate_random_for_rsa,
|
||||
src_size, src, ciphertext);
|
||||
if (r == 0) {
|
||||
mpz_clear(ciphertext);
|
||||
return -1;
|
||||
}
|
||||
size_t len = crypto_export(dst, dst_size, ciphertext);
|
||||
mpz_clear(ciphertext);
|
||||
return len;
|
||||
}
|
||||
|
||||
ssize_t crypto_rsa_decrypt(struct crypto_rsa_priv_key* priv, uint8_t* dst,
|
||||
size_t dst_size, const uint8_t* src, size_t src_size)
|
||||
{
|
||||
mpz_t ciphertext;
|
||||
mpz_init(ciphertext);
|
||||
crypto_import(ciphertext, src, src_size);
|
||||
int r = rsa_decrypt(&priv->key, &dst_size, dst, ciphertext);
|
||||
mpz_clear(ciphertext);
|
||||
return r != 0 ? (ssize_t)dst_size : -1;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -456,7 +456,7 @@ static int on_apple_dh_response(struct nvnc_client* client)
|
|||
crypto_hash_del(hash_ctx);
|
||||
|
||||
struct crypto_cipher* cipher;
|
||||
cipher = crypto_cipher_new(hash, CRYPTO_CIPHER_AES128_ECB);
|
||||
cipher = crypto_cipher_new(NULL, hash, CRYPTO_CIPHER_AES128_ECB);
|
||||
assert(cipher);
|
||||
|
||||
char username[128] = {};
|
||||
|
|
|
|||
Loading…
Reference in New Issue