Update libsrtp to upstream 1.5.0

srtp/crypto/cipher/aes_icm_ossl.c

+/*
+ * aes_icm_ossl.c
+ *
+ * AES Integer Counter Mode
+ *
+ * John A. Foley
+ * Cisco Systems, Inc.
+ *
+ * 2/24/2012:  This module was modified to use CiscoSSL for AES counter
+ *             mode.  Eddy Lem contributed the code to allow this.
+ *
+ * 12/20/2012: Added support for AES-192 and AES-256.
+ */
+
+/*
+ *
+ * Copyright (c) 2013, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ *   Neither the name of the Cisco Systems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include <openssl/evp.h>
+#include "aes_icm_ossl.h"
+#include "crypto_types.h"
+#include "alloc.h"
+#include "crypto_types.h"
+
+
+debug_module_t mod_aes_icm = {
+    0,               /* debugging is off by default */
+    "aes icm ossl"   /* printable module name       */
+};
+extern cipher_test_case_t aes_icm_test_case_0;
+extern cipher_type_t aes_icm;
+#ifndef SRTP_NO_AES192
+extern cipher_type_t aes_icm_192;
+#endif
+extern cipher_type_t aes_icm_256;
+
+/*
+ * integer counter mode works as follows:
+ *
+ * 16 bits
+ * <----->
+ * +------+------+------+------+------+------+------+------+
+ * |           nonce           |    packet index    |  ctr |---+
+ * +------+------+------+------+------+------+------+------+   |
+ *                                                             |
+ * +------+------+------+------+------+------+------+------+   v
+ * |                      salt                      |000000|->(+)
+ * +------+------+------+------+------+------+------+------+   |
+ *                                                             |
+ *                                                        +---------+
+ *                                                        | encrypt |
+ *                                                        +---------+
+ *                                                             |
+ * +------+------+------+------+------+------+------+------+   |
+ * |                    keystream block                    |<--+
+ * +------+------+------+------+------+------+------+------+
+ *
+ * All fields are big-endian
+ *
+ * ctr is the block counter, which increments from zero for
+ * each packet (16 bits wide)
+ *
+ * packet index is distinct for each packet (48 bits wide)
+ *
+ * nonce can be distinct across many uses of the same key, or
+ * can be a fixed value per key, or can be per-packet randomness
+ * (64 bits)
+ *
+ */
+
+/*
+ * This function allocates a new instance of this crypto engine.
+ * The key_len parameter should be one of 30, 38, or 46 for
+ * AES-128, AES-192, and AES-256 respectively.  Note, this key_len
+ * value is inflated, as it also accounts for the 112 bit salt
+ * value.  The tlen argument is for the AEAD tag length, which
+ * isn't used in counter mode.
+ */
+err_status_t aes_icm_openssl_alloc (cipher_t **c, int key_len, int tlen)
+{
+    aes_icm_ctx_t *icm;
+    int tmp;
+    uint8_t *allptr;
+
+    debug_print(mod_aes_icm, "allocating cipher with key length %d", key_len);
+
+    /*
+     * Verify the key_len is valid for one of: AES-128/192/256
+     */
+    if (key_len != AES_128_KEYSIZE_WSALT &&
+#ifndef SRTP_NO_AES192
+        key_len != AES_192_KEYSIZE_WSALT &&
+#endif
+        key_len != AES_256_KEYSIZE_WSALT) {
+        return err_status_bad_param;
+    }
+
+    /* allocate memory a cipher of type aes_icm */
+    tmp = sizeof(cipher_t) + sizeof(aes_icm_ctx_t);
+    allptr = (uint8_t*)crypto_alloc(tmp);
+    if (allptr == NULL) {
+        return err_status_alloc_fail;
+    }
+
+    /* set pointers */
+    *c = (cipher_t*)allptr;
+    (*c)->state = allptr + sizeof(cipher_t);
+    icm = (aes_icm_ctx_t*)(*c)->state;
+
+    /* increment ref_count */
+    switch (key_len) {
+    case AES_128_KEYSIZE_WSALT:
+        (*c)->algorithm = AES_128_ICM;
+        (*c)->type = &aes_icm;
+        aes_icm.ref_count++;
+        ((aes_icm_ctx_t*)(*c)->state)->key_size = AES_128_KEYSIZE;
+        break;
+#ifndef SRTP_NO_AES192
+    case AES_192_KEYSIZE_WSALT:
+        (*c)->algorithm = AES_192_ICM;
+        (*c)->type = &aes_icm_192;
+        aes_icm_192.ref_count++;
+        ((aes_icm_ctx_t*)(*c)->state)->key_size = AES_192_KEYSIZE;
+        break;
+#endif
+    case AES_256_KEYSIZE_WSALT:
+        (*c)->algorithm = AES_256_ICM;
+        (*c)->type = &aes_icm_256;
+        aes_icm_256.ref_count++;
+        ((aes_icm_ctx_t*)(*c)->state)->key_size = AES_256_KEYSIZE;
+        break;
+    }
+
+    /* set key size        */
+    (*c)->key_len = key_len;
+    EVP_CIPHER_CTX_init(&icm->ctx);
+
+    return err_status_ok;
+}
+
+
+/*
+ * This function deallocates an instance of this engine
+ */
+err_status_t aes_icm_openssl_dealloc (cipher_t *c)
+{
+    aes_icm_ctx_t *ctx;
+
+    if (c == NULL) {
+        return err_status_bad_param;
+    }
+
+    /*
+     * Free the EVP context
+     */
+    ctx = (aes_icm_ctx_t*)c->state;
+    if (ctx != NULL) {
+        EVP_CIPHER_CTX_cleanup(&ctx->ctx);
+        /* decrement ref_count for the appropriate engine */
+        switch (ctx->key_size) {
+        case AES_256_KEYSIZE:
+            aes_icm_256.ref_count--;
+            break;
+#ifndef SRTP_NO_AES192
+        case AES_192_KEYSIZE:
+            aes_icm_192.ref_count--;
+            break;
+#endif
+        case AES_128_KEYSIZE:
+            aes_icm.ref_count--;
+            break;
+        default:
+            return err_status_dealloc_fail;
+            break;
+        }
+    }
+
+    /* zeroize entire state*/
+    octet_string_set_to_zero((uint8_t*)c,
+                             sizeof(cipher_t) + sizeof(aes_icm_ctx_t));
+
+    /* free memory */
+    crypto_free(c);
+
+    return err_status_ok;
+}
+
+/*
+ * aes_icm_openssl_context_init(...) initializes the aes_icm_context
+ * using the value in key[].
+ *
+ * the key is the secret key
+ *
+ * the salt is unpredictable (but not necessarily secret) data which
+ * randomizes the starting point in the keystream
+ */
+err_status_t aes_icm_openssl_context_init (aes_icm_ctx_t *c, const uint8_t *key, int len)
+{
+    /*
+     * set counter and initial values to 'offset' value, being careful not to
+     * go past the end of the key buffer
+     */
+
+    if (c->key_size + SALT_SIZE != len)
+        return err_status_bad_param;
+
+    v128_set_to_zero(&c->counter);
+    v128_set_to_zero(&c->offset);
+    memcpy(&c->counter, key + c->key_size, SALT_SIZE);
+    memcpy(&c->offset, key + c->key_size, SALT_SIZE);
+
+    /* force last two octets of the offset to zero (for srtp compatibility) */
+    c->offset.v8[SALT_SIZE] = c->offset.v8[SALT_SIZE + 1] = 0;
+    c->counter.v8[SALT_SIZE] = c->counter.v8[SALT_SIZE + 1] = 0;
+
+    /* copy key to be used later when CiscoSSL crypto context is created */
+    v128_copy_octet_string((v128_t*)&c->key, key);
+
+    /* if the key is greater than 16 bytes, copy the second
+     * half.  Note, we treat AES-192 and AES-256 the same here
+     * for simplicity.  The storage location receiving the
+     * key is statically allocated to handle a full 32 byte key
+     * regardless of the cipher in use.
+     */
+    if (c->key_size == AES_256_KEYSIZE
+#ifndef SRTP_NO_AES192
+        || c->key_size == AES_192_KEYSIZE
+#endif
+        ) {
+        debug_print(mod_aes_icm, "Copying last 16 bytes of key: %s",
+                    v128_hex_string((v128_t*)(key + AES_128_KEYSIZE)));
+        v128_copy_octet_string(((v128_t*)(&c->key.v8)) + 1, key + AES_128_KEYSIZE);
+    }
+
+    debug_print(mod_aes_icm, "key:  %s", v128_hex_string((v128_t*)&c->key));
+    debug_print(mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
+
+    EVP_CIPHER_CTX_cleanup(&c->ctx);
+
+    return err_status_ok;
+}
+
+
+/*
+ * aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
+ * the offset
+ */
+err_status_t aes_icm_openssl_set_iv (aes_icm_ctx_t *c, void *iv, int dir)
+{
+    const EVP_CIPHER *evp;
+    v128_t nonce;
+
+    /* set nonce (for alignment) */
+    v128_copy_octet_string(&nonce, iv);
+
+    debug_print(mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
+
+    v128_xor(&c->counter, &c->offset, &nonce);
+
+    debug_print(mod_aes_icm, "set_counter: %s", v128_hex_string(&c->counter));
+
+    switch (c->key_size) {
+    case AES_256_KEYSIZE:
+        evp = EVP_aes_256_ctr();
+        break;
+#ifndef SRTP_NO_AES192
+    case AES_192_KEYSIZE:
+        evp = EVP_aes_192_ctr();
+        break;
+#endif
+    case AES_128_KEYSIZE:
+        evp = EVP_aes_128_ctr();
+        break;
+    default:
+        return err_status_bad_param;
+        break;
+    }
+
+    if (!EVP_EncryptInit_ex(&c->ctx, evp,
+                            NULL, c->key.v8, c->counter.v8)) {
+        return err_status_fail;
+    } else {
+        return err_status_ok;
+    }
+}
+
+/*
+ * This function encrypts a buffer using AES CTR mode
+ *
+ * Parameters:
+ *      c       Crypto context
+ *      buf     data to encrypt
+ *      enc_len length of encrypt buffer
+ */
+err_status_t aes_icm_openssl_encrypt (aes_icm_ctx_t *c, unsigned char *buf, unsigned int *enc_len)
+{
+    int len = 0;
+
+    debug_print(mod_aes_icm, "rs0: %s", v128_hex_string(&c->counter));
+
+    if (!EVP_EncryptUpdate(&c->ctx, buf, &len, buf, *enc_len)) {
+        return err_status_cipher_fail;
+    }
+    *enc_len = len;
+
+    if (!EVP_EncryptFinal_ex(&c->ctx, buf, &len)) {
+        return err_status_cipher_fail;
+    }
+    *enc_len += len;
+
+    return err_status_ok;
+}
+
+uint16_t aes_icm_bytes_encrypted(aes_icm_ctx_t *c)
+{
+    return htons(c->counter.v16[7]);
+}
+
+/*
+ * Name of this crypto engine
+ */
+char aes_icm_openssl_description[] = "AES-128 counter mode using openssl";
+#ifndef SRTP_NO_AES192
+char aes_icm_192_openssl_description[] = "AES-192 counter mode using openssl";
+#endif
+char aes_icm_256_openssl_description[] = "AES-256 counter mode using openssl";
+
+
+/*
+ * KAT values for AES self-test.  These
+ * values came from the legacy libsrtp code.
+ */
+uint8_t aes_icm_test_case_0_key[AES_128_KEYSIZE_WSALT] = {
+    0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
+    0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
+    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
+};
+
+uint8_t aes_icm_test_case_0_nonce[16] = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+uint8_t aes_icm_test_case_0_plaintext[32] =  {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+uint8_t aes_icm_test_case_0_ciphertext[32] = {
+    0xe0, 0x3e, 0xad, 0x09, 0x35, 0xc9, 0x5e, 0x80,
+    0xe1, 0x66, 0xb1, 0x6d, 0xd9, 0x2b, 0x4e, 0xb4,
+    0xd2, 0x35, 0x13, 0x16, 0x2b, 0x02, 0xd0, 0xf7,
+    0x2a, 0x43, 0xa2, 0xfe, 0x4a, 0x5f, 0x97, 0xab
+};
+
+cipher_test_case_t aes_icm_test_case_0 = {
+    AES_128_KEYSIZE_WSALT,                 /* octets in key            */
+    aes_icm_test_case_0_key,               /* key                      */
+    aes_icm_test_case_0_nonce,             /* packet index             */
+    32,                                    /* octets in plaintext      */
+    aes_icm_test_case_0_plaintext,         /* plaintext                */
+    32,                                    /* octets in ciphertext     */
+    aes_icm_test_case_0_ciphertext,        /* ciphertext               */
+    0,
+    NULL,
+    0,
+    NULL                                   /* pointer to next testcase */
+};
+
+#ifndef SRTP_NO_AES192
+/*
+ * KAT values for AES-192-CTR self-test.  These
+ * values came from section 7 of RFC 6188.
+ */
+uint8_t aes_icm_192_test_case_1_key[AES_192_KEYSIZE_WSALT] = {
+    0xea, 0xb2, 0x34, 0x76, 0x4e, 0x51, 0x7b, 0x2d,
+    0x3d, 0x16, 0x0d, 0x58, 0x7d, 0x8c, 0x86, 0x21,
+    0x97, 0x40, 0xf6, 0x5f, 0x99, 0xb6, 0xbc, 0xf7,
+    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
+};
+
+uint8_t aes_icm_192_test_case_1_nonce[16] = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+uint8_t aes_icm_192_test_case_1_plaintext[32] =  {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+uint8_t aes_icm_192_test_case_1_ciphertext[32] = {
+    0x35, 0x09, 0x6c, 0xba, 0x46, 0x10, 0x02, 0x8d,
+    0xc1, 0xb5, 0x75, 0x03, 0x80, 0x4c, 0xe3, 0x7c,
+    0x5d, 0xe9, 0x86, 0x29, 0x1d, 0xcc, 0xe1, 0x61,
+    0xd5, 0x16, 0x5e, 0xc4, 0x56, 0x8f, 0x5c, 0x9a
+};
+
+cipher_test_case_t aes_icm_192_test_case_1 = {
+    AES_192_KEYSIZE_WSALT,                 /* octets in key            */
+    aes_icm_192_test_case_1_key,           /* key                      */
+    aes_icm_192_test_case_1_nonce,         /* packet index             */
+    32,                                    /* octets in plaintext      */
+    aes_icm_192_test_case_1_plaintext,     /* plaintext                */
+    32,                                    /* octets in ciphertext     */
+    aes_icm_192_test_case_1_ciphertext,    /* ciphertext               */
+    0,
+    NULL,
+    0,
+    NULL                                   /* pointer to next testcase */
+};
+#endif
+
+/*
+ * KAT values for AES-256-CTR self-test.  These
+ * values came from section 7 of RFC 6188.
+ */
+uint8_t aes_icm_256_test_case_2_key[AES_256_KEYSIZE_WSALT] = {
+    0x57, 0xf8, 0x2f, 0xe3, 0x61, 0x3f, 0xd1, 0x70,
+    0xa8, 0x5e, 0xc9, 0x3c, 0x40, 0xb1, 0xf0, 0x92,
+    0x2e, 0xc4, 0xcb, 0x0d, 0xc0, 0x25, 0xb5, 0x82,
+    0x72, 0x14, 0x7c, 0xc4, 0x38, 0x94, 0x4a, 0x98,
+    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
+    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
+};
+
+uint8_t aes_icm_256_test_case_2_nonce[16] = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+uint8_t aes_icm_256_test_case_2_plaintext[32] =  {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+uint8_t aes_icm_256_test_case_2_ciphertext[32] = {
+    0x92, 0xbd, 0xd2, 0x8a, 0x93, 0xc3, 0xf5, 0x25,
+    0x11, 0xc6, 0x77, 0xd0, 0x8b, 0x55, 0x15, 0xa4,
+    0x9d, 0xa7, 0x1b, 0x23, 0x78, 0xa8, 0x54, 0xf6,
+    0x70, 0x50, 0x75, 0x6d, 0xed, 0x16, 0x5b, 0xac
+};
+
+cipher_test_case_t aes_icm_256_test_case_2 = {
+    AES_256_KEYSIZE_WSALT,                 /* octets in key            */
+    aes_icm_256_test_case_2_key,           /* key                      */
+    aes_icm_256_test_case_2_nonce,         /* packet index             */
+    32,                                    /* octets in plaintext      */
+    aes_icm_256_test_case_2_plaintext,     /* plaintext                */
+    32,                                    /* octets in ciphertext     */
+    aes_icm_256_test_case_2_ciphertext,    /* ciphertext               */
+    0,
+    NULL,
+    0,
+    NULL                                   /* pointer to next testcase */
+};
+
+/*
+ * This is the function table for this crypto engine.
+ * note: the encrypt function is identical to the decrypt function
+ */
+cipher_type_t aes_icm = {
+    (cipher_alloc_func_t)          aes_icm_openssl_alloc,
+    (cipher_dealloc_func_t)        aes_icm_openssl_dealloc,
+    (cipher_init_func_t)           aes_icm_openssl_context_init,
+    (cipher_set_aad_func_t)        0,
+    (cipher_encrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_decrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_set_iv_func_t)         aes_icm_openssl_set_iv,
+    (cipher_get_tag_func_t)        0,
+    (char*)                        aes_icm_openssl_description,
+    (int)                          0,            /* instance count */
+    (cipher_test_case_t*)          &aes_icm_test_case_0,
+    (debug_module_t*)              &mod_aes_icm,
+    (cipher_type_id_t)             AES_ICM
+};
+
+#ifndef SRTP_NO_AES192
+/*
+ * This is the function table for this crypto engine.
+ * note: the encrypt function is identical to the decrypt function
+ */
+cipher_type_t aes_icm_192 = {
+    (cipher_alloc_func_t)          aes_icm_openssl_alloc,
+    (cipher_dealloc_func_t)        aes_icm_openssl_dealloc,
+    (cipher_init_func_t)           aes_icm_openssl_context_init,
+    (cipher_set_aad_func_t)        0,
+    (cipher_encrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_decrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_set_iv_func_t)         aes_icm_openssl_set_iv,
+    (cipher_get_tag_func_t)        0,
+    (char*)                        aes_icm_192_openssl_description,
+    (int)                          0,                /* instance count */
+    (cipher_test_case_t*)          &aes_icm_192_test_case_1,
+    (debug_module_t*)              &mod_aes_icm,
+    (cipher_type_id_t)             AES_192_ICM
+};
+#endif
+
+/*
+ * This is the function table for this crypto engine.
+ * note: the encrypt function is identical to the decrypt function
+ */
+cipher_type_t aes_icm_256 = {
+    (cipher_alloc_func_t)          aes_icm_openssl_alloc,
+    (cipher_dealloc_func_t)        aes_icm_openssl_dealloc,
+    (cipher_init_func_t)           aes_icm_openssl_context_init,
+    (cipher_set_aad_func_t)        0,
+    (cipher_encrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_decrypt_func_t)        aes_icm_openssl_encrypt,
+    (cipher_set_iv_func_t)         aes_icm_openssl_set_iv,
+    (cipher_get_tag_func_t)        0,
+    (char*)                        aes_icm_256_openssl_description,
+    (int)                          0,                /* instance count */
+    (cipher_test_case_t*)          &aes_icm_256_test_case_2,
+    (debug_module_t*)              &mod_aes_icm,
+    (cipher_type_id_t)             AES_256_ICM
+};
+