diff --git a/ChangeLog b/ChangeLog
index 392ba31..7a298ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -39,6 +39,10 @@
      - MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
      - MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
      in favour of a new single error MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA.
+   * Deprecate the Blowfish error constants
+     - MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+     - MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH
+     in favour of a new single error MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA.
 
 New deprecations
    * Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update
diff --git a/include/mbedtls/blowfish.h b/include/mbedtls/blowfish.h
index 82b772a..0f192aa 100644
--- a/include/mbedtls/blowfish.h
+++ b/include/mbedtls/blowfish.h
@@ -33,6 +33,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "platform_util.h"
+
 #define MBEDTLS_BLOWFISH_ENCRYPT     1
 #define MBEDTLS_BLOWFISH_DECRYPT     0
 #define MBEDTLS_BLOWFISH_MAX_KEY_BITS     448
@@ -40,14 +42,16 @@
 #define MBEDTLS_BLOWFISH_ROUNDS      16         /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */
 #define MBEDTLS_BLOWFISH_BLOCKSIZE   8          /* Blowfish uses 64 bit blocks */
 
-#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH                -0x0016  /**< Invalid key length. */
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH   MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0016 )
+#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0018 )
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
+#define MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA -0x0016 /**< Bad input data. */
 
 /* MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED is deprecated and should not be used.
  */
 #define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED                   -0x0017  /**< Blowfish hardware accelerator failed. */
 
-#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH              -0x0018  /**< Invalid data input length. */
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 9531ef5..a8f587c 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -51,7 +51,7 @@
  * Module   Nr  Codes assigned
  * MPI       7  0x0002-0x0010
  * GCM       3  0x0012-0x0014   0x0013-0x0013
- * BLOWFISH  3  0x0016-0x0018   0x0017-0x0017
+ * BLOWFISH  2  0x0016-0x0016   0x0017-0x0017
  * THREADING 3  0x001A-0x001E
  * AES       5  0x0020-0x0022   0x0021-0x0025
  * CAMELLIA  2  0x0024-0x0024   0x0027-0x0027
diff --git a/library/blowfish.c b/library/blowfish.c
index 5b6bb98..e42bd2b 100644
--- a/library/blowfish.c
+++ b/library/blowfish.c
@@ -176,7 +176,7 @@
     if( keybits < MBEDTLS_BLOWFISH_MIN_KEY_BITS || keybits > MBEDTLS_BLOWFISH_MAX_KEY_BITS ||
         ( keybits % 8 ) )
     {
-        return( MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH );
+        return( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA );
     }
 
     keybits >>= 3;
@@ -265,7 +265,7 @@
     unsigned char temp[MBEDTLS_BLOWFISH_BLOCKSIZE];
 
     if( length % MBEDTLS_BLOWFISH_BLOCKSIZE )
-        return( MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH );
+        return( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA );
 
     if( mode == MBEDTLS_BLOWFISH_DECRYPT )
     {
diff --git a/tests/suites/test_suite_blowfish.data b/tests/suites/test_suite_blowfish.data
index 1ba311f..a39f875 100644
--- a/tests/suites/test_suite_blowfish.data
+++ b/tests/suites/test_suite_blowfish.data
@@ -203,13 +203,13 @@
 blowfish_decrypt_ecb:"fedcba9876543210":"6b5c5a9c5d9e0a5a":"ffffffffffffffff":0
 
 BLOWFISH-SETKEY Setkey SSLeay reference #1
-blowfish_encrypt_ecb:"f0":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #2
-blowfish_encrypt_ecb:"f0e1":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #3
-blowfish_encrypt_ecb:"f0e1d2":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1d2":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #4
 blowfish_encrypt_ecb:"f0e1d2c3":"fedcba9876543210":"be1e639408640f05":0
@@ -281,7 +281,7 @@
 blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fff":"fedcba9876543210":"2fb3ab7f0ee91b69":0
 
 BLOWFISH-SETKEY Setkey 456 bits
-blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fffff":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fffff":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-CBC Encrypt
 blowfish_encrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"37363534333231204E6F77206973207468652074696D6520666F722000000000":"6b77b4d63006dee605b156e27403979358deb9e7154616d959f1652bd5ff92cc":0
@@ -290,10 +290,10 @@
 blowfish_decrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC":"37363534333231204e6f77206973207468652074696d6520666f722000000000":0
 
 BLOWFISH-CBC Encrypt
-blowfish_encrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"37363534333231204E6F77206973207468652074696D6520666F7220000000":"":MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH
+blowfish_encrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"37363534333231204E6F77206973207468652074696D6520666F7220000000":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-CBC Decrypt
-blowfish_decrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC00":"":MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH
+blowfish_decrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC00":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-CFB Encrypt
 blowfish_encrypt_cfb64:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"37363534333231204E6F77206973207468652074696D6520666F722000":"e73214a2822139caf26ecf6d2eb9e76e3da3de04d1517200519d57a6c3"