--- a/adb/adb_auth_host.c
+++ b/adb/adb_auth_host.c
@@ -39,15 +39,13 @@
 
 #include <cutils/list.h>
 
-#include <openssl/evp.h>
-#include <openssl/objects.h>
-#include <openssl/pem.h>
-#include <openssl/rsa.h>
-#include <openssl/sha.h>
-
-#if defined(OPENSSL_IS_BORINGSSL)
-#include <openssl/base64.h>
-#endif
+#include <mbedtls/rsa.h>
+#include <mbedtls/sha1.h>
+#include <mbedtls/base64.h>
+#include <mbedtls/entropy.h>
+#include <mbedtls/ctr_drbg.h>
+#include <mbedtls/pk.h>
+#include <mbedtls/pem.h>
 
 #define TRACE_TAG TRACE_AUTH
 
@@ -57,56 +55,92 @@
 
 struct adb_private_key {
     struct listnode node;
-    RSA *rsa;
+    mbedtls_pk_context pk;
 };
 
 static struct listnode key_list;
+static mbedtls_ctr_drbg_context ctr_drbg;
 
 
 /* Convert OpenSSL RSA private key to android pre-computed RSAPublicKey format */
-static int RSA_to_RSAPublicKey(RSA *rsa, RSAPublicKey *pkey)
+static int RSA_to_RSAPublicKey(mbedtls_pk_context *pk, RSAPublicKey *pkey)
 {
     int ret = 1;
     unsigned int i;
+    mbedtls_mpi r32, rr, r, rem, n, n0inv, e, tmp;
+    mbedtls_rsa_context *rsa;
+    unsigned char buf[sizeof(uint32_t)];
+
+    if (mbedtls_pk_get_type(pk) != MBEDTLS_PK_RSA) {
+        return 0;
+    }
 
-    BN_CTX* ctx = BN_CTX_new();
-    BIGNUM* r32 = BN_new();
-    BIGNUM* rr = BN_new();
-    BIGNUM* r = BN_new();
-    BIGNUM* rem = BN_new();
-    BIGNUM* n = BN_new();
-    BIGNUM* n0inv = BN_new();
+    rsa = mbedtls_pk_rsa(*pk);
+    if (!rsa) {
+         return 0;
+    }
 
-    if (RSA_size(rsa) != RSANUMBYTES) {
+    mbedtls_mpi_init(&r32);
+    mbedtls_mpi_init(&rr);
+    mbedtls_mpi_init(&r);
+    mbedtls_mpi_init(&rem);
+    mbedtls_mpi_init(&n);
+    mbedtls_mpi_init(&n0inv);
+    mbedtls_mpi_init(&e);
+    mbedtls_mpi_init(&tmp);
+
+    if (mbedtls_rsa_get_len(rsa) != RSANUMBYTES) {
         ret = 0;
         goto out;
     }
 
-    BN_set_bit(r32, 32);
-    BN_copy(n, rsa->n);
-    BN_set_bit(r, RSANUMWORDS * 32);
-    BN_mod_sqr(rr, r, n, ctx);
-    BN_div(NULL, rem, n, r32, ctx);
-    BN_mod_inverse(n0inv, rem, r32, ctx);
+    mbedtls_rsa_export(rsa, &n, NULL, NULL, NULL, &e);
+
+    mbedtls_mpi_lset(&r32, 1);
+    mbedtls_mpi_shift_l(&r32, 32);
+    mbedtls_mpi_lset(&r, 1);
+    mbedtls_mpi_shift_l(&r, RSANUMWORDS * 32);
+    mbedtls_mpi_mul_mpi(&rr, &r, &r);
+    mbedtls_mpi_mod_mpi(&rr, &rr, &n);
+    mbedtls_mpi_div_mpi(NULL, &rem, &n, &r32);
+    mbedtls_mpi_inv_mod(&n0inv, &rem, &r32);
 
     pkey->len = RSANUMWORDS;
-    pkey->n0inv = 0 - BN_get_word(n0inv);
+
+    mbedtls_mpi_write_binary(&n0inv, buf, sizeof(buf));
+    uint32_t n0inv_val = ((buf[0] << 24) | (buf[1] << 16) |
+                          (buf[2] << 8)  |  buf[3]);
+    pkey->n0inv = 0 - n0inv_val;
+
     for (i = 0; i < RSANUMWORDS; i++) {
-        BN_div(rr, rem, rr, r32, ctx);
-        pkey->rr[i] = BN_get_word(rem);
-        BN_div(n, rem, n, r32, ctx);
-        pkey->n[i] = BN_get_word(rem);
+        mbedtls_mpi_div_mpi(&tmp, &rem, &rr, &r32);
+        mbedtls_mpi_copy(&rr, &tmp);
+
+        mbedtls_mpi_write_binary(&rem, buf, sizeof(buf));
+        pkey->rr[i] = ((buf[0] << 24) | (buf[1] << 16) |
+                       (buf[2] << 8)  |  buf[3]);
+
+        mbedtls_mpi_div_mpi(&tmp, &rem, &n, &r32);
+        mbedtls_mpi_copy(&n, &tmp);
+
+        mbedtls_mpi_write_binary(&rem, buf, sizeof(buf));
+        pkey->n[i] = ((buf[0] << 24) | (buf[1] << 16) |
+                      (buf[2] << 8)  |  buf[3]);
     }
-    pkey->exponent = BN_get_word(rsa->e);
+
+    mbedtls_mpi_write_binary(&e, buf, sizeof(buf));
+    pkey->exponent = ((buf[0] << 24) | (buf[1] << 16) |
+                      (buf[2] << 8)  |  buf[3]);
 
 out:
-    BN_free(n0inv);
-    BN_free(n);
-    BN_free(rem);
-    BN_free(r);
-    BN_free(rr);
-    BN_free(r32);
-    BN_CTX_free(ctx);
+    mbedtls_mpi_free(&tmp);
+    mbedtls_mpi_free(&e);
+    mbedtls_mpi_free(&n0inv);
+    mbedtls_mpi_free(&n);
+    mbedtls_mpi_free(&rem);
+    mbedtls_mpi_free(&r);
+    mbedtls_mpi_free(&rr);
+    mbedtls_mpi_free(&r32);
 
     return ret;
 }
@@ -133,7 +167,7 @@ static void get_user_info(char *buf, siz
         buf[len - 1] = '\0';
 }
 
-static int write_public_keyfile(RSA *private_key, const char *private_key_path)
+static int write_public_keyfile(mbedtls_pk_context *private_key, const char *private_key_path)
 {
     RSAPublicKey pkey;
     FILE *outfile = NULL;
@@ -161,16 +195,7 @@ static int write_public_keyfile(RSA *pri
 
     D("Writing public key to '%s'\n", path);
 
-#if defined(OPENSSL_IS_BORINGSSL)
-    if (!EVP_EncodedLength(&encoded_length, sizeof(pkey))) {
-        D("Public key too large to base64 encode");
-        goto out;
-    }
-#else
-    /* While we switch from OpenSSL to BoringSSL we have to implement
-     * |EVP_EncodedLength| here. */
     encoded_length = 1 + ((sizeof(pkey) + 2) / 3 * 4);
-#endif
 
     encoded = malloc(encoded_length);
     if (encoded == NULL) {
@@ -178,7 +203,12 @@ static int write_public_keyfile(RSA *pri
         goto out;
     }
 
-    encoded_length = EVP_EncodeBlock(encoded, (uint8_t*) &pkey, sizeof(pkey));
+    if (mbedtls_base64_encode(encoded, encoded_length, &encoded_length,
+                             (unsigned char*)&pkey, sizeof(pkey)) != 0) {
+        D("Base64 encoding failed");
+        goto out;
+    }
+
     get_user_info(info, sizeof(info));
 
     if (fwrite(encoded, encoded_length, 1, outfile) != 1 ||
@@ -201,23 +231,25 @@ static int write_public_keyfile(RSA *pri
 
 static int generate_key(const char *file)
 {
-    EVP_PKEY* pkey = EVP_PKEY_new();
-    BIGNUM* exponent = BN_new();
-    RSA* rsa = RSA_new();
+    mbedtls_pk_context pk;
     mode_t old_mask;
     FILE *f = NULL;
     int ret = 0;
 
     D("generate_key '%s'\n", file);
 
-    if (!pkey || !exponent || !rsa) {
-        D("Failed to allocate key\n");
+    mbedtls_pk_init(&pk);
+
+    if (mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) != 0) {
+        D("Failed to setup key context\n");
         goto out;
     }
 
-    BN_set_word(exponent, RSA_F4);
-    RSA_generate_key_ex(rsa, 2048, exponent, NULL);
-    EVP_PKEY_set1_RSA(pkey, rsa);
+    if (mbedtls_rsa_gen_key(mbedtls_pk_rsa(pk), mbedtls_ctr_drbg_random, &ctr_drbg,
+                            2048, 65537) != 0) {
+        D("Failed to generate key\n");
+        goto out;
+    }
 
     old_mask = umask(077);
 
@@ -230,12 +262,20 @@ static int generate_key(const char *file
 
     umask(old_mask);
 
-    if (!PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL)) {
-        D("Failed to write key\n");
+    unsigned char buf[16000];
+    size_t len;
+
+    if (mbedtls_pk_write_key_pem(&pk, buf, sizeof(buf)) != 0) {
+        D("Failed to write key to buffer\n");
         goto out;
     }
 
-    if (!write_public_keyfile(rsa, file)) {
+    if (fwrite(buf, strlen((char*)buf), 1, f) != 1) {
+        D("Failed to write buffer to file\n");
+        goto out;
+    }
+
+    if (!write_public_keyfile(&pk, file)) {
         D("Failed to write public key\n");
         goto out;
     }
@@ -243,44 +283,32 @@ static int generate_key(const char *file
     ret = 1;
 
 out:
-    if (f)
+    if (f) {
         fclose(f);
-    EVP_PKEY_free(pkey);
-    RSA_free(rsa);
-    BN_free(exponent);
+    }
+    mbedtls_pk_free(&pk);
     return ret;
 }
 
 static int read_key(const char *file, struct listnode *list)
 {
     struct adb_private_key *key;
-    FILE *f;
-
-    D("read_key '%s'\n", file);
-
-    f = fopen(file, "r");
-    if (!f) {
-        D("Failed to open '%s'\n", file);
-        return 0;
-    }
 
     key = malloc(sizeof(*key));
     if (!key) {
         D("Failed to alloc key\n");
-        fclose(f);
         return 0;
     }
-    key->rsa = RSA_new();
 
-    if (!PEM_read_RSAPrivateKey(f, &key->rsa, NULL, NULL)) {
+    mbedtls_pk_init(&key->pk);
+
+    if (mbedtls_pk_parse_keyfile(&key->pk, file, NULL, mbedtls_ctr_drbg_random, &ctr_drbg) != 0) {
         D("Failed to read key\n");
-        fclose(f);
-        RSA_free(key->rsa);
+        mbedtls_pk_free(&key->pk);
         free(key);
         return 0;
     }
 
-    fclose(f);
     list_add_tail(list, &key->node);
     return 1;
 }
@@ -373,15 +401,20 @@ static void get_vendor_keys(struct listn
 
 int adb_auth_sign(void *node, void *token, size_t token_size, void *sig)
 {
-    unsigned int len;
     struct adb_private_key *key = node_to_item(node, struct adb_private_key, node);
+    unsigned char hash[20];
+    size_t sig_len;
+
+    mbedtls_sha1((unsigned char*)token, token_size, hash);
 
-    if (!RSA_sign(NID_sha1, token, token_size, sig, &len, key->rsa)) {
+    if (mbedtls_pk_sign(&key->pk, MBEDTLS_MD_SHA1, hash, sizeof(hash),
+                        sig, mbedtls_pk_get_len(&key->pk), &sig_len,
+                        mbedtls_ctr_drbg_random, &ctr_drbg) != 0) {
         return 0;
     }
 
-    D("adb_auth_sign len=%d\n", len);
-    return (int)len;
+    D("adb_auth_sign len=%d\n", (int)sig_len);
+    return (int)sig_len;
 }
 
 void *adb_auth_nextkey(void *current)
@@ -439,10 +472,19 @@ int adb_auth_get_userkey(unsigned char *
 void adb_auth_init(void)
 {
     int ret;
+    mbedtls_entropy_context entropy;
 
     D("adb_auth_init\n");
 
     list_init(&key_list);
+    mbedtls_entropy_init(&entropy);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+
+    if (mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
+                              (const unsigned char *)"adb_auth", 8) != 0) {
+        D("Failed to seed RNG\n");
+        return;
+    }
 
     ret = get_user_key(&key_list);
     if (!ret) {