diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 5943cfcfa5..9817d35a7d 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -1140,17 +1140,11 @@ void mbedtls_x509write_crt_free(mbedtls_x509write_cert *ctx);
  * \param ctx       certificate to write away
  * \param buf       buffer to write to
  * \param size      size of the buffer
- * \param f_rng     RNG function. This must not be \c NULL.
- * \param p_rng     RNG parameter
  *
  * \return          length of data written if successful, or a specific
  *                  error code
- *
- * \note            \p f_rng is used for the signature operation.
  */
-int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng);
+int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size);
 
 #if defined(MBEDTLS_PEM_WRITE_C)
 /**
@@ -1159,16 +1153,11 @@ int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx, unsigned char *buf, s
  * \param ctx       certificate to write away
  * \param buf       buffer to write to
  * \param size      size of the buffer
- * \param f_rng     RNG function. This must not be \c NULL.
- * \param p_rng     RNG parameter
  *
  * \return          0 if successful, or a specific error code
  *
- * \note            \p f_rng is used for the signature operation.
  */
-int mbedtls_x509write_crt_pem(mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng);
+int mbedtls_x509write_crt_pem(mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size);
 #endif /* MBEDTLS_PEM_WRITE_C */
 #endif /* MBEDTLS_X509_CRT_WRITE_C */
 
diff --git a/include/mbedtls/x509_csr.h b/include/mbedtls/x509_csr.h
index 08e585f3f3..f9eb04d333 100644
--- a/include/mbedtls/x509_csr.h
+++ b/include/mbedtls/x509_csr.h
@@ -337,17 +337,12 @@ void mbedtls_x509write_csr_free(mbedtls_x509write_csr *ctx);
  * \param ctx       CSR to write away
  * \param buf       buffer to write to
  * \param size      size of the buffer
- * \param f_rng     RNG function. This must not be \c NULL.
- * \param p_rng     RNG parameter
  *
  * \return          length of data written if successful, or a specific
  *                  error code
  *
- * \note            \p f_rng is used for the signature operation.
  */
-int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng);
+int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size);
 
 #if defined(MBEDTLS_PEM_WRITE_C)
 /**
@@ -357,16 +352,11 @@ int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf, si
  * \param ctx       CSR to write away
  * \param buf       buffer to write to
  * \param size      size of the buffer
- * \param f_rng     RNG function. This must not be \c NULL.
- * \param p_rng     RNG parameter
  *
  * \return          0 if successful, or a specific error code
  *
- * \note            \p f_rng is used for the signature operation.
  */
-int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng);
+int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size);
 #endif /* MBEDTLS_PEM_WRITE_C */
 #endif /* MBEDTLS_X509_CSR_WRITE_C */
 
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index c06844db76..e0743e1a6a 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -2827,7 +2827,7 @@ sign:
                                            ssl->out_msg + 6 + offset,
                                            out_buf_len - 6 - offset,
                                            &n,
-                                           ssl->conf->f_rng, ssl->conf->p_rng, rs_ctx)) != 0) {
+                                           rs_ctx)) != 0) {
         MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_pk_sign", ret);
 #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
         if (ret == MBEDTLS_ERR_ECP_IN_PROGRESS) {
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index fb88cf2956..84d5994ca0 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -3035,9 +3035,7 @@ curve_matching_done:
                                    md_alg, hash, hashlen,
                                    ssl->out_msg + ssl->out_msglen + 2,
                                    out_buf_len - ssl->out_msglen - 2,
-                                   signature_len,
-                                   ssl->conf->f_rng,
-                                   ssl->conf->p_rng)) != 0) {
+                                   signature_len)) != 0) {
             MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_pk_sign", ret);
             return ret;
         }
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 1076dea393..deba2ae1e0 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -978,8 +978,7 @@ static int ssl_tls13_write_certificate_verify_body(mbedtls_ssl_context *ssl,
 
         if ((ret = mbedtls_pk_sign_ext(pk_type, own_key,
                                        md_alg, verify_hash, verify_hash_len,
-                                       p + 4, (size_t) (end - (p + 4)), &signature_len,
-                                       ssl->conf->f_rng, ssl->conf->p_rng)) != 0) {
+                                       p + 4, (size_t) (end - (p + 4)), &signature_len)) != 0) {
             MBEDTLS_SSL_DEBUG_MSG(2, ("CertificateVerify signature failed with %s",
                                       mbedtls_ssl_sig_alg_to_str(*sig_alg)));
             MBEDTLS_SSL_DEBUG_RET(2, "mbedtls_pk_sign_ext", ret);
diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index 8a476978a1..7d207481c2 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -379,9 +379,7 @@ static int x509_write_time(unsigned char **p, unsigned char *start,
 }
 
 int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx,
-                              unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng)
+                              unsigned char *buf, size_t size)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     const char *sig_oid;
@@ -571,8 +569,7 @@ int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx,
 
 
     if ((ret = mbedtls_pk_sign(ctx->issuer_key, ctx->md_alg,
-                               hash, hash_length, sig, sizeof(sig), &sig_len,
-                               f_rng, p_rng)) != 0) {
+                               hash, hash_length, sig, sizeof(sig), &sig_len)) != 0) {
         return ret;
     }
 
@@ -614,15 +611,12 @@ int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx,
 
 #if defined(MBEDTLS_PEM_WRITE_C)
 int mbedtls_x509write_crt_pem(mbedtls_x509write_cert *crt,
-                              unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng)
+                              unsigned char *buf, size_t size)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t olen;
 
-    if ((ret = mbedtls_x509write_crt_der(crt, buf, size,
-                                         f_rng, p_rng)) < 0) {
+    if ((ret = mbedtls_x509write_crt_der(crt, buf, size)) < 0) {
         return ret;
     }
 
diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index dd75d8f898..e65ddb07f4 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -131,9 +131,7 @@ int mbedtls_x509write_csr_set_ns_cert_type(mbedtls_x509write_csr *ctx,
 static int x509write_csr_der_internal(mbedtls_x509write_csr *ctx,
                                       unsigned char *buf,
                                       size_t size,
-                                      unsigned char *sig, size_t sig_size,
-                                      int (*f_rng)(void *, unsigned char *, size_t),
-                                      void *p_rng)
+                                      unsigned char *sig, size_t sig_size)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     const char *sig_oid;
@@ -218,8 +216,7 @@ static int x509write_csr_der_internal(mbedtls_x509write_csr *ctx,
         return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
     }
     if ((ret = mbedtls_pk_sign(ctx->key, ctx->md_alg, hash, 0,
-                               sig, sig_size, &sig_len,
-                               f_rng, p_rng)) != 0) {
+                               sig, sig_size, &sig_len)) != 0) {
         return ret;
     }
 
@@ -274,9 +271,7 @@ static int x509write_csr_der_internal(mbedtls_x509write_csr *ctx,
 }
 
 int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf,
-                              size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng)
+                              size_t size)
 {
     int ret;
     unsigned char *sig;
@@ -286,8 +281,7 @@ int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf,
     }
 
     ret = x509write_csr_der_internal(ctx, buf, size,
-                                     sig, MBEDTLS_PK_SIGNATURE_MAX_SIZE,
-                                     f_rng, p_rng);
+                                     sig, MBEDTLS_PK_SIGNATURE_MAX_SIZE);
 
     mbedtls_free(sig);
 
@@ -298,15 +292,12 @@ int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf,
 #define PEM_END_CSR             "-----END CERTIFICATE REQUEST-----\n"
 
 #if defined(MBEDTLS_PEM_WRITE_C)
-int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
-                              int (*f_rng)(void *, unsigned char *, size_t),
-                              void *p_rng)
+int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t olen = 0;
 
-    if ((ret = mbedtls_x509write_csr_der(ctx, buf, size,
-                                         f_rng, p_rng)) < 0) {
+    if ((ret = mbedtls_x509write_csr_der(ctx, buf, size)) < 0) {
         return ret;
     }
 
diff --git a/programs/fuzz/fuzz_dtlsserver.c b/programs/fuzz/fuzz_dtlsserver.c
index 404c4ad304..740dea5aaf 100644
--- a/programs/fuzz/fuzz_dtlsserver.c
+++ b/programs/fuzz/fuzz_dtlsserver.c
@@ -82,8 +82,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
             return 1;
         }
         if (mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
-                                 mbedtls_test_srv_key_len, NULL, 0,
-                                 dummy_random, &ctr_drbg) != 0) {
+                                 mbedtls_test_srv_key_len, NULL, 0) != 0) {
             return 1;
         }
 #endif
diff --git a/programs/fuzz/fuzz_privkey.c b/programs/fuzz/fuzz_privkey.c
index 1a5fbba9ae..8055603c64 100644
--- a/programs/fuzz/fuzz_privkey.c
+++ b/programs/fuzz/fuzz_privkey.c
@@ -44,8 +44,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
         goto exit;
     }
 
-    ret = mbedtls_pk_parse_key(&pk, Data, Size, NULL, 0,
-                               dummy_random, &ctr_drbg);
+    ret = mbedtls_pk_parse_key(&pk, Data, Size, NULL, 0);
     if (ret == 0) {
 #if defined(MBEDTLS_RSA_C)
         if (mbedtls_pk_get_type(&pk) == MBEDTLS_PK_RSA) {
diff --git a/programs/fuzz/fuzz_server.c b/programs/fuzz/fuzz_server.c
index 64fe32d268..857b1b64f9 100644
--- a/programs/fuzz/fuzz_server.c
+++ b/programs/fuzz/fuzz_server.c
@@ -91,8 +91,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
             return 1;
         }
         if (mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
-                                 mbedtls_test_srv_key_len, NULL, 0,
-                                 dummy_random, &ctr_drbg) != 0) {
+                                 mbedtls_test_srv_key_len, NULL, 0) != 0) {
             return 1;
         }
 #endif
diff --git a/programs/pkey/key_app.c b/programs/pkey/key_app.c
index b064078016..2be584266a 100644
--- a/programs/pkey/key_app.c
+++ b/programs/pkey/key_app.c
@@ -248,8 +248,7 @@ usage:
             goto cleanup;
         }
 
-        ret = mbedtls_pk_parse_keyfile(&pk, opt.filename, opt.password,
-                                       mbedtls_ctr_drbg_random, &ctr_drbg);
+        ret = mbedtls_pk_parse_keyfile(&pk, opt.filename, opt.password);
 
         if (ret != 0) {
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile returned -0x%04x\n",
diff --git a/programs/pkey/key_app_writer.c b/programs/pkey/key_app_writer.c
index b9b477b839..e36130bcd1 100644
--- a/programs/pkey/key_app_writer.c
+++ b/programs/pkey/key_app_writer.c
@@ -363,8 +363,7 @@ usage:
             goto exit;
         }
 
-        ret = mbedtls_pk_parse_keyfile(&key, opt.filename, NULL,
-                                       mbedtls_ctr_drbg_random, &ctr_drbg);
+        ret = mbedtls_pk_parse_keyfile(&key, opt.filename, NULL);
         if (ret != 0) {
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile returned -0x%04x",
                            (unsigned int) -ret);
diff --git a/programs/pkey/pk_decrypt.c b/programs/pkey/pk_decrypt.c
index a7b9001fc9..d2bfde50f0 100644
--- a/programs/pkey/pk_decrypt.c
+++ b/programs/pkey/pk_decrypt.c
@@ -89,8 +89,7 @@ int main(int argc, char *argv[])
     mbedtls_printf("\n  . Reading private key from '%s'", argv[1]);
     fflush(stdout);
 
-    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
-                                        mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "")) != 0) {
         mbedtls_printf(" failed\n  ! mbedtls_pk_parse_keyfile returned -0x%04x\n",
                        (unsigned int) -ret);
         goto exit;
@@ -119,8 +118,7 @@ int main(int argc, char *argv[])
     mbedtls_printf("\n  . Decrypting the encrypted data");
     fflush(stdout);
 
-    if ((ret = mbedtls_pk_decrypt(&pk, buf, i, result, &olen, sizeof(result),
-                                  mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = mbedtls_pk_decrypt(&pk, buf, i, result, &olen, sizeof(result))) != 0) {
         mbedtls_printf(" failed\n  ! mbedtls_pk_decrypt returned -0x%04x\n",
                        (unsigned int) -ret);
         goto exit;
diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
index 28a849b38f..1ab2a3d60e 100644
--- a/programs/pkey/pk_encrypt.c
+++ b/programs/pkey/pk_encrypt.c
@@ -105,8 +105,7 @@ int main(int argc, char *argv[])
     fflush(stdout);
 
     if ((ret = mbedtls_pk_encrypt(&pk, input, strlen(argv[2]),
-                                  buf, &olen, sizeof(buf),
-                                  mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+                                  buf, &olen, sizeof(buf))) != 0) {
         mbedtls_printf(" failed\n  ! mbedtls_pk_encrypt returned -0x%04x\n",
                        (unsigned int) -ret);
         goto exit;
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index af52583201..92d96608e3 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -85,8 +85,7 @@ int main(int argc, char *argv[])
     mbedtls_printf("\n  . Reading private key from '%s'", argv[1]);
     fflush(stdout);
 
-    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
-                                        mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "")) != 0) {
         mbedtls_printf(" failed\n  ! Could not parse '%s'\n", argv[1]);
         goto exit;
     }
@@ -106,8 +105,7 @@ int main(int argc, char *argv[])
     }
 
     if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
-                               buf, sizeof(buf), &olen,
-                               mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+                               buf, sizeof(buf), &olen)) != 0) {
         mbedtls_printf(" failed\n  ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
         goto exit;
     }
diff --git a/programs/pkey/rsa_sign_pss.c b/programs/pkey/rsa_sign_pss.c
index e4f27f337a..a5e06fb197 100644
--- a/programs/pkey/rsa_sign_pss.c
+++ b/programs/pkey/rsa_sign_pss.c
@@ -86,8 +86,7 @@ int main(int argc, char *argv[])
     mbedtls_printf("\n  . Reading private key from '%s'", argv[1]);
     fflush(stdout);
 
-    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
-                                        mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "")) != 0) {
         mbedtls_printf(" failed\n  ! Could not read key from '%s'\n", argv[1]);
         mbedtls_printf("  ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
         goto exit;
@@ -120,8 +119,7 @@ int main(int argc, char *argv[])
     }
 
     if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
-                               buf, sizeof(buf), &olen,
-                               mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+                               buf, sizeof(buf), &olen)) != 0) {
         mbedtls_printf(" failed\n  ! mbedtls_pk_sign returned %d\n\n", ret);
         goto exit;
     }
diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index d1c2a8c1c6..a10a6e6bb2 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -165,9 +165,7 @@ int main(void)
                                 (const unsigned char *) mbedtls_test_srv_key,
                                 mbedtls_test_srv_key_len,
                                 NULL,
-                                0,
-                                mbedtls_ctr_drbg_random,
-                                &ctr_drbg);
+                                0);
     if (ret != 0) {
         printf(" failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret);
         goto exit;
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 6ed073eef5..e4efadc0d1 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1736,12 +1736,12 @@ usage:
     } else
 #if defined(MBEDTLS_FS_IO)
     if (strlen(opt.key_file)) {
-        ret = mbedtls_pk_parse_keyfile(&pkey, opt.key_file, opt.key_pwd, rng_get, &rng);
+        ret = mbedtls_pk_parse_keyfile(&pkey, opt.key_file, opt.key_pwd);
     } else
 #endif
     { ret = mbedtls_pk_parse_key(&pkey,
                                  (const unsigned char *) mbedtls_test_cli_key,
-                                 mbedtls_test_cli_key_len, NULL, 0, rng_get, &rng); }
+                                 mbedtls_test_cli_key_len, NULL, 0); }
     if (ret != 0) {
         mbedtls_printf(" failed\n  !  mbedtls_pk_parse_key returned -0x%x\n\n",
                        (unsigned int) -ret);
diff --git a/programs/ssl/ssl_fork_server.c b/programs/ssl/ssl_fork_server.c
index b9598585bf..f1eb21f3d9 100644
--- a/programs/ssl/ssl_fork_server.c
+++ b/programs/ssl/ssl_fork_server.c
@@ -138,8 +138,7 @@ int main(void)
     }
 
     ret =  mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
-                                mbedtls_test_srv_key_len, NULL, 0,
-                                mbedtls_ctr_drbg_random, &ctr_drbg);
+                                mbedtls_test_srv_key_len, NULL, 0);
     if (ret != 0) {
         mbedtls_printf(" failed!  mbedtls_pk_parse_key returned %d\n\n", ret);
         goto exit;
diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index d3354caf73..69aefef7db 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -514,8 +514,7 @@ usage:
 
 #if defined(MBEDTLS_FS_IO)
     if (strlen(opt.key_file)) {
-        ret = mbedtls_pk_parse_keyfile(&pkey, opt.key_file, "",
-                                       mbedtls_ctr_drbg_random, &ctr_drbg);
+        ret = mbedtls_pk_parse_keyfile(&pkey, opt.key_file, "");
     } else
 #endif
 #if defined(MBEDTLS_PEM_PARSE_C)
@@ -524,9 +523,7 @@ usage:
                                    (const unsigned char *) mbedtls_test_cli_key,
                                    mbedtls_test_cli_key_len,
                                    NULL,
-                                   0,
-                                   mbedtls_ctr_drbg_random,
-                                   &ctr_drbg);
+                                   0);
     }
 #else
     {
diff --git a/programs/ssl/ssl_pthread_server.c b/programs/ssl/ssl_pthread_server.c
index a1c583aabc..1214eb83fa 100644
--- a/programs/ssl/ssl_pthread_server.c
+++ b/programs/ssl/ssl_pthread_server.c
@@ -379,8 +379,7 @@ int main(void)
 
     mbedtls_pk_init(&pkey);
     ret =  mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
-                                mbedtls_test_srv_key_len, NULL, 0,
-                                mbedtls_ctr_drbg_random, &ctr_drbg);
+                                mbedtls_test_srv_key_len, NULL, 0);
     if (ret != 0) {
         mbedtls_printf(" failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret);
         goto exit;
diff --git a/programs/ssl/ssl_server.c b/programs/ssl/ssl_server.c
index 4b101d39ad..0f27b8227d 100644
--- a/programs/ssl/ssl_server.c
+++ b/programs/ssl/ssl_server.c
@@ -144,8 +144,7 @@ int main(void)
     }
 
     ret =  mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
-                                mbedtls_test_srv_key_len, NULL, 0,
-                                mbedtls_ctr_drbg_random, &ctr_drbg);
+                                mbedtls_test_srv_key_len, NULL, 0);
     if (ret != 0) {
         mbedtls_printf(" failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret);
         goto exit;
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 8a0e18aefd..556e906498 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -824,7 +824,7 @@ static sni_entry *sni_parse(char *sni_string)
         mbedtls_pk_init(new->key);
 
         if (mbedtls_x509_crt_parse_file(new->cert, crt_file) != 0 ||
-            mbedtls_pk_parse_keyfile(new->key, key_file, "", rng_get, &rng) != 0) {
+            mbedtls_pk_parse_keyfile(new->key, key_file, "") != 0) {
             goto error;
         }
 
@@ -1175,8 +1175,7 @@ static int ssl_async_start(mbedtls_ssl_context *ssl,
      * public key. */
     for (slot = 0; slot < config_data->slots_used; slot++) {
         if (mbedtls_pk_check_pair(&cert->pk,
-                                  config_data->slots[slot].pk,
-                                  rng_get, &rng) == 0) {
+                                  config_data->slots[slot].pk) == 0) {
             break;
         }
     }
@@ -1247,12 +1246,16 @@ static int ssl_async_resume(mbedtls_ssl_context *ssl,
     }
 
     switch (ctx->operation_type) {
+        case ASYNC_OP_DECRYPT:
+            ret = mbedtls_pk_decrypt(key_slot->pk,
+                                     ctx->input, ctx->input_len,
+                                     output, output_len, output_size);
+            break;
         case ASYNC_OP_SIGN:
             ret = mbedtls_pk_sign(key_slot->pk,
                                   ctx->md_alg,
                                   ctx->input, ctx->input_len,
-                                  output, output_size, output_len,
-                                  config_data->f_rng, config_data->p_rng);
+                                  output, output_size, output_len);
             break;
         default:
             mbedtls_printf(
@@ -2637,7 +2640,7 @@ usage:
     if (strlen(opt.key_file) && strcmp(opt.key_file, "none") != 0) {
         key_cert_init++;
         if ((ret = mbedtls_pk_parse_keyfile(&pkey, opt.key_file,
-                                            opt.key_pwd, rng_get, &rng)) != 0) {
+                                            opt.key_pwd)) != 0) {
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile returned -0x%x\n\n",
                            (unsigned int) -ret);
             goto exit;
@@ -2659,7 +2662,7 @@ usage:
     if (strlen(opt.key_file2) && strcmp(opt.key_file2, "none") != 0) {
         key_cert_init2++;
         if ((ret = mbedtls_pk_parse_keyfile(&pkey2, opt.key_file2,
-                                            opt.key_pwd2, rng_get, &rng)) != 0) {
+                                            opt.key_pwd2)) != 0) {
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile(2) returned -0x%x\n\n",
                            (unsigned int) -ret);
             goto exit;
@@ -2686,8 +2689,7 @@ usage:
         }
         if ((ret = mbedtls_pk_parse_key(&pkey,
                                         (const unsigned char *) mbedtls_test_srv_key_rsa,
-                                        mbedtls_test_srv_key_rsa_len, NULL, 0,
-                                        rng_get, &rng)) != 0) {
+                                        mbedtls_test_srv_key_rsa_len, NULL, 0)) != 0) {
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_key returned -0x%x\n\n",
                            (unsigned int) -ret);
             goto exit;
@@ -2704,8 +2706,7 @@ usage:
         }
         if ((ret = mbedtls_pk_parse_key(&pkey2,
                                         (const unsigned char *) mbedtls_test_srv_key_ec,
-                                        mbedtls_test_srv_key_ec_len, NULL, 0,
-                                        rng_get, &rng)) != 0) {
+                                        mbedtls_test_srv_key_ec_len, NULL, 0)) != 0) {
             mbedtls_printf(" failed\n  !  pk_parse_key2 returned -0x%x\n\n",
                            (unsigned int) -ret);
             goto exit;
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index 1be335c0ad..f09e93863a 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -109,9 +109,7 @@ struct options {
     mbedtls_md_type_t md_alg;         /* Hash algorithm used for signature.       */
 } opt;
 
-static int write_certificate_request(mbedtls_x509write_csr *req, const char *output_file,
-                                     int (*f_rng)(void *, unsigned char *, size_t),
-                                     void *p_rng)
+static int write_certificate_request(mbedtls_x509write_csr *req, const char *output_file)
 {
     int ret;
     FILE *f;
@@ -119,7 +117,7 @@ static int write_certificate_request(mbedtls_x509write_csr *req, const char *out
     size_t len = 0;
 
     memset(output_buf, 0, 4096);
-    if ((ret = mbedtls_x509write_csr_pem(req, output_buf, 4096, f_rng, p_rng)) < 0) {
+    if ((ret = mbedtls_x509write_csr_pem(req, output_buf, 4096)) < 0) {
         return ret;
     }
 
@@ -454,8 +452,7 @@ usage:
     mbedtls_printf("  . Loading the private key ...");
     fflush(stdout);
 
-    ret = mbedtls_pk_parse_keyfile(&key, opt.filename, opt.password,
-                                   mbedtls_ctr_drbg_random, &ctr_drbg);
+    ret = mbedtls_pk_parse_keyfile(&key, opt.filename, opt.password);
 
     if (ret != 0) {
         mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile returned %d", ret);
@@ -472,8 +469,7 @@ usage:
     mbedtls_printf("  . Writing the certificate request ...");
     fflush(stdout);
 
-    if ((ret = write_certificate_request(&req, opt.output_file,
-                                         mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = write_certificate_request(&req, opt.output_file)) != 0) {
         mbedtls_printf(" failed\n  !  write_certificate_request %d", ret);
         goto exit;
     }
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index 5993f24657..9776dc1c37 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -206,9 +206,7 @@ struct options {
     int format;                 /* format                               */
 } opt;
 
-static int write_certificate(mbedtls_x509write_cert *crt, const char *output_file,
-                             int (*f_rng)(void *, unsigned char *, size_t),
-                             void *p_rng)
+static int write_certificate(mbedtls_x509write_cert *crt, const char *output_file)
 {
     int ret;
     FILE *f;
@@ -218,8 +216,7 @@ static int write_certificate(mbedtls_x509write_cert *crt, const char *output_fil
 
     memset(output_buf, 0, 4096);
     if (opt.format == FORMAT_DER) {
-        ret = mbedtls_x509write_crt_der(crt, output_buf, 4096,
-                                        f_rng, p_rng);
+        ret = mbedtls_x509write_crt_der(crt, output_buf, 4096);
         if (ret < 0) {
             return ret;
         }
@@ -227,8 +224,7 @@ static int write_certificate(mbedtls_x509write_cert *crt, const char *output_fil
         len = ret;
         output_start = output_buf + 4096 - len;
     } else {
-        ret = mbedtls_x509write_crt_pem(crt, output_buf, 4096,
-                                        f_rng, p_rng);
+        ret = mbedtls_x509write_crt_pem(crt, output_buf, 4096);
         if (ret < 0) {
             return ret;
         }
@@ -780,7 +776,7 @@ usage:
         fflush(stdout);
 
         ret = mbedtls_pk_parse_keyfile(&loaded_subject_key, opt.subject_key,
-                                       opt.subject_pwd, mbedtls_ctr_drbg_random, &ctr_drbg);
+                                       opt.subject_pwd);
         if (ret != 0) {
             mbedtls_strerror(ret, buf, sizeof(buf));
             mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile "
@@ -795,7 +791,7 @@ usage:
     fflush(stdout);
 
     ret = mbedtls_pk_parse_keyfile(&loaded_issuer_key, opt.issuer_key,
-                                   opt.issuer_pwd, mbedtls_ctr_drbg_random, &ctr_drbg);
+                                   opt.issuer_pwd);
     if (ret != 0) {
         mbedtls_strerror(ret, buf, sizeof(buf));
         mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile "
@@ -806,8 +802,7 @@ usage:
     // Check if key and issuer certificate match
     //
     if (strlen(opt.issuer_crt)) {
-        if (mbedtls_pk_check_pair(&issuer_crt.pk, issuer_key,
-                                  mbedtls_ctr_drbg_random, &ctr_drbg) != 0) {
+        if (mbedtls_pk_check_pair(&issuer_crt.pk, issuer_key) != 0) {
             mbedtls_printf(" failed\n  !  issuer_key does not match "
                            "issuer certificate\n\n");
             goto exit;
@@ -984,8 +979,7 @@ usage:
     mbedtls_printf("  . Writing the certificate...");
     fflush(stdout);
 
-    if ((ret = write_certificate(&crt, opt.output_file,
-                                 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
+    if ((ret = write_certificate(&crt, opt.output_file)) != 0) {
         mbedtls_strerror(ret, buf, sizeof(buf));
         mbedtls_printf(" failed\n  !  write_certificate -0x%04x - %s\n\n",
                        (unsigned int) -ret, buf);
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index 3c3bb6a54a..1ebd5a6fa7 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -652,8 +652,7 @@ int mbedtls_test_ssl_endpoint_certificate_init(mbedtls_test_ssl_endpoint *ep,
             ret = mbedtls_pk_parse_key(
                 cert->pkey,
                 (const unsigned char *) mbedtls_test_srv_key_rsa_der,
-                mbedtls_test_srv_key_rsa_der_len, NULL, 0,
-                mbedtls_test_rnd_std_rand, NULL);
+                mbedtls_test_srv_key_rsa_der_len, NULL, 0);
             TEST_ASSERT(ret == 0);
         } else {
             ret = mbedtls_x509_crt_parse(
@@ -665,8 +664,7 @@ int mbedtls_test_ssl_endpoint_certificate_init(mbedtls_test_ssl_endpoint *ep,
             ret = mbedtls_pk_parse_key(
                 cert->pkey,
                 (const unsigned char *) mbedtls_test_srv_key_ec_der,
-                mbedtls_test_srv_key_ec_der_len, NULL, 0,
-                mbedtls_test_rnd_std_rand, NULL);
+                mbedtls_test_srv_key_ec_der_len, NULL, 0);
             TEST_ASSERT(ret == 0);
         }
     } else {
@@ -680,8 +678,7 @@ int mbedtls_test_ssl_endpoint_certificate_init(mbedtls_test_ssl_endpoint *ep,
             ret = mbedtls_pk_parse_key(
                 cert->pkey,
                 (const unsigned char *) mbedtls_test_cli_key_rsa_der,
-                mbedtls_test_cli_key_rsa_der_len, NULL, 0,
-                mbedtls_test_rnd_std_rand, NULL);
+                mbedtls_test_cli_key_rsa_der_len, NULL, 0);
             TEST_ASSERT(ret == 0);
         } else {
             ret = mbedtls_x509_crt_parse(
@@ -693,8 +690,7 @@ int mbedtls_test_ssl_endpoint_certificate_init(mbedtls_test_ssl_endpoint *ep,
             ret = mbedtls_pk_parse_key(
                 cert->pkey,
                 (const unsigned char *) mbedtls_test_cli_key_ec_der,
-                mbedtls_test_cli_key_ec_der_len, NULL, 0,
-                mbedtls_test_rnd_std_rand, NULL);
+                mbedtls_test_cli_key_ec_der_len, NULL, 0);
             TEST_ASSERT(ret == 0);
         }
     }
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index d1df9e3912..376cd12337 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -23,13 +23,18 @@ static int mbedtls_rsa_decrypt_func(void *ctx, size_t *olen,
     return mbedtls_rsa_pkcs1_decrypt((mbedtls_rsa_context *) ctx, NULL, NULL,
                                      olen, input, output, output_max_len);
 }
+
 static int mbedtls_rsa_sign_func(void *ctx,
-                                 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
                                  mbedtls_md_type_t md_alg, unsigned int hashlen,
                                  const unsigned char *hash, unsigned char *sig)
 {
-    return mbedtls_rsa_pkcs1_sign((mbedtls_rsa_context *) ctx, f_rng, p_rng,
-                                  md_alg, hashlen, hash, sig);
+    return mbedtls_rsa_pkcs1_sign((mbedtls_rsa_context *) ctx,
+                                  mbedtls_psa_get_random,
+                                  MBEDTLS_PSA_RANDOM_STATE,
+                                  md_alg,
+                                  hashlen,
+                                  hash,
+                                  sig);
 }
 static size_t mbedtls_rsa_key_len_func(void *ctx)
 {
@@ -210,8 +215,7 @@ void x509_csr_check(char *key_file, char *cert_req_check_file, int md_type,
     mbedtls_pk_init(&key);
     MD_OR_USE_PSA_INIT();
 
-    TEST_ASSERT(mbedtls_pk_parse_keyfile(&key, key_file, NULL,
-                                         mbedtls_test_rnd_std_rand, NULL) == 0);
+    TEST_ASSERT(mbedtls_pk_parse_keyfile(&key, key_file, NULL) == 0);
 
     mbedtls_x509write_csr_set_md_alg(&req, md_type);
     mbedtls_x509write_csr_set_key(&req, &key);
@@ -229,8 +233,7 @@ void x509_csr_check(char *key_file, char *cert_req_check_file, int md_type,
         TEST_ASSERT(mbedtls_x509write_csr_set_subject_alternative_name(&req, san_list) == 0);
     }
 
-    ret = mbedtls_x509write_csr_pem(&req, buf, sizeof(buf),
-                                    mbedtls_test_rnd_pseudo_rand, &rnd_info);
+    ret = mbedtls_x509write_csr_pem(&req, buf, sizeof(buf));
     TEST_ASSERT(ret == 0);
 
     pem_len = strlen((char *) buf);
@@ -254,9 +257,7 @@ void x509_csr_check(char *key_file, char *cert_req_check_file, int md_type,
     TEST_ASSERT(memcmp(buf, check_buf, pem_len - 1) == 0);
 #endif /* MBEDTLS_USE_PSA_CRYPTO */
 
-    der_len = mbedtls_x509write_csr_der(&req, buf, sizeof(buf),
-                                        mbedtls_test_rnd_pseudo_rand,
-                                        &rnd_info);
+    der_len = mbedtls_x509write_csr_der(&req, buf, sizeof(buf));
     TEST_ASSERT(der_len >= 0);
 
     if (der_len == 0) {
@@ -271,8 +272,7 @@ void x509_csr_check(char *key_file, char *cert_req_check_file, int md_type,
 #else
     der_len -= 1;
 #endif
-    ret = mbedtls_x509write_csr_der(&req, buf, (size_t) (der_len),
-                                    mbedtls_test_rnd_pseudo_rand, &rnd_info);
+    ret = mbedtls_x509write_csr_der(&req, buf, (size_t) (der_len));
     TEST_ASSERT(ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL);
 
 exit:
@@ -306,8 +306,7 @@ void x509_csr_check_opaque(char *key_file, int md_type, int key_usage,
 
     memset(&rnd_info, 0x2a, sizeof(mbedtls_test_rnd_pseudo_info));
 
-    TEST_ASSERT(mbedtls_pk_parse_keyfile(&key, key_file, NULL,
-                                         mbedtls_test_rnd_std_rand, NULL) == 0);
+    TEST_ASSERT(mbedtls_pk_parse_keyfile(&key, key_file, NULL) == 0);
 
     /* Turn the PK context into an opaque one. */
     TEST_EQUAL(mbedtls_pk_get_psa_attributes(&key, PSA_KEY_USAGE_SIGN_HASH, &key_attr), 0);
@@ -326,8 +325,7 @@ void x509_csr_check_opaque(char *key_file, int md_type, int key_usage,
         TEST_ASSERT(mbedtls_x509write_csr_set_ns_cert_type(&req, cert_type) == 0);
     }
 
-    ret = mbedtls_x509write_csr_pem(&req, buf, sizeof(buf) - 1,
-                                    mbedtls_test_rnd_pseudo_rand, &rnd_info);
+    ret = mbedtls_x509write_csr_pem(&req, buf, sizeof(buf) - 1);
 
     TEST_ASSERT(ret == 0);
 
@@ -431,10 +429,10 @@ void x509_crt_check(char *subject_key_file, char *subject_pwd,
     MD_OR_USE_PSA_INIT();
 
     TEST_ASSERT(mbedtls_pk_parse_keyfile(&subject_key, subject_key_file,
-                                         subject_pwd, mbedtls_test_rnd_std_rand, NULL) == 0);
+                                         subject_pwd) == 0);
 
     TEST_ASSERT(mbedtls_pk_parse_keyfile(&issuer_key, issuer_key_file,
-                                         issuer_pwd, mbedtls_test_rnd_std_rand, NULL) == 0);
+                                         issuer_pwd) == 0);
 
     issuer_key_type = mbedtls_pk_get_type(&issuer_key);
 
@@ -522,8 +520,7 @@ void x509_crt_check(char *subject_key_file, char *subject_pwd,
     if (set_subjectAltNames) {
         TEST_ASSERT(mbedtls_x509write_crt_set_subject_alternative_name(&crt, san_list) == 0);
     }
-    ret = mbedtls_x509write_crt_pem(&crt, buf, sizeof(buf),
-                                    mbedtls_test_rnd_pseudo_rand, &rnd_info);
+    ret = mbedtls_x509write_crt_pem(&crt, buf, sizeof(buf));
     TEST_ASSERT(ret == 0);
 
     pem_len = strlen((char *) buf);
@@ -565,9 +562,7 @@ void x509_crt_check(char *subject_key_file, char *subject_pwd,
         TEST_ASSERT(memcmp(buf, check_buf, pem_len - 1) == 0);
     }
 
-    der_len = mbedtls_x509write_crt_der(&crt, buf, sizeof(buf),
-                                        mbedtls_test_rnd_pseudo_rand,
-                                        &rnd_info);
+    der_len = mbedtls_x509write_crt_der(&crt, buf, sizeof(buf));
     TEST_ASSERT(der_len >= 0);
 
     if (der_len == 0) {
@@ -625,8 +620,7 @@ void x509_crt_check(char *subject_key_file, char *subject_pwd,
 #endif
     der_len -= 1;
 
-    ret = mbedtls_x509write_crt_der(&crt, buf, (size_t) (der_len),
-                                    mbedtls_test_rnd_pseudo_rand, &rnd_info);
+    ret = mbedtls_x509write_crt_der(&crt, buf, (size_t) (der_len));
     TEST_ASSERT(ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL);
 
 exit: