Implement internally opaque bn access from evp
[openssl.git] / crypto / evp / e_aes.c
index a0368d9..ba3d43b 100644 (file)
@@ -1,5 +1,5 @@
 /* ====================================================================
- * Copyright (c) 2001-2011 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 2001-2014 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -48,7 +48,7 @@
  *
  */
 
-#define OPENSSL_FIPSAPI
+
 
 #include <openssl/opensslconf.h>
 #ifndef OPENSSL_NO_AES
@@ -107,6 +107,25 @@ typedef struct
        ccm128_f str;
        } EVP_AES_CCM_CTX;
 
+#ifndef OPENSSL_NO_OCB
+typedef struct
+       {
+       AES_KEY ksenc;          /* AES key schedule to use for encryption */
+       AES_KEY ksdec;          /* AES key schedule to use for decryption */
+       int key_set;            /* Set if key initialised */
+       int iv_set;             /* Set if an iv is set */
+       OCB128_CONTEXT ocb;
+       unsigned char *iv;      /* Temporary IV store */
+       unsigned char tag[16];
+       unsigned char data_buf[16]; /* Store partial data blocks */
+       unsigned char aad_buf[16]; /* Store partial AAD blocks */
+       int data_buf_len;
+       int aad_buf_len;
+       int ivlen;              /* IV length */
+       int taglen;
+       } EVP_AES_OCB_CTX;
+#endif
+
 #define MAXBITCHUNK    ((size_t)1<<(sizeof(size_t)*8-4))
 
 #ifdef VPAES_ASM
@@ -155,16 +174,17 @@ void AES_xts_decrypt(const char *inp,char *out,size_t len,
 #endif
 
 #if    defined(OPENSSL_CPUID_OBJ) && (defined(__powerpc__) || defined(__ppc__) || defined(_ARCH_PPC))
-extern unsigned int OPENSSL_ppccap_P;
+# include "ppc_arch.h"
 # ifdef VPAES_ASM
-#  define VPAES_CAPABLE        (OPENSSL_ppccap_P&(1<<1))
+#  define VPAES_CAPABLE        (OPENSSL_ppccap_P & PPC_ALTIVEC)
 # endif
-# define HWAES_CAPABLE (OPENSSL_ppccap_P&(1<<2))
+# define HWAES_CAPABLE (OPENSSL_ppccap_P & PPC_CRYPTO207)
 # define HWAES_set_encrypt_key aes_p8_set_encrypt_key
 # define HWAES_set_decrypt_key aes_p8_set_decrypt_key
 # define HWAES_encrypt aes_p8_encrypt
 # define HWAES_decrypt aes_p8_decrypt
 # define HWAES_cbc_encrypt aes_p8_cbc_encrypt
+# define HWAES_ctr32_encrypt_blocks aes_p8_ctr32_encrypt_blocks
 #endif
 
 #if    defined(AES_ASM) && !defined(I386_ONLY) &&      (  \
@@ -180,7 +200,7 @@ extern unsigned int OPENSSL_ia32cap_P[];
 #define VPAES_CAPABLE  (OPENSSL_ia32cap_P[1]&(1<<(41-32)))
 #endif
 #ifdef BSAES_ASM
-#define BSAES_CAPABLE  VPAES_CAPABLE
+#define BSAES_CAPABLE  (OPENSSL_ia32cap_P[1]&(1<<(41-32)))
 #endif
 /*
  * AES-NI section
@@ -450,6 +470,59 @@ static int aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 static int aesni_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                const unsigned char *in, size_t len);
 
+#ifndef OPENSSL_NO_OCB
+static int aesni_ocb_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+                        const unsigned char *iv, int enc)
+       {
+       EVP_AES_OCB_CTX *octx = ctx->cipher_data;
+       if (!iv && !key)
+               return 1;
+       if (key)
+               {
+               do
+                       {
+                       /* We set both the encrypt and decrypt key here because decrypt
+                        * needs both. We could possibly optimise to remove setting the
+                        * decrypt for an encryption operation.
+                        */
+                       aesni_set_encrypt_key(key, ctx->key_len * 8, &octx->ksenc);
+                       aesni_set_decrypt_key(key, ctx->key_len * 8, &octx->ksdec);
+                       if(!CRYPTO_ocb128_init(&octx->ocb, &octx->ksenc, &octx->ksdec,
+                                       (block128_f)aesni_encrypt, (block128_f)aesni_decrypt))
+                               return 0;
+                       }
+               while (0);
+
+               /* If we have an iv we can set it directly, otherwise use
+                * saved IV.
+                */
+               if (iv == NULL && octx->iv_set)
+                       iv = octx->iv;
+               if (iv)
+                       {
+                       if(CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen) != 1)
+                               return 0;
+                       octx->iv_set = 1;
+                       }
+               octx->key_set = 1;
+               }
+       else
+               {
+               /* If key set use IV, otherwise copy */
+               if (octx->key_set)
+                       CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen);
+               else
+                       memcpy(octx->iv, iv, octx->ivlen);
+               octx->iv_set = 1;
+               }
+       return 1;
+       }
+
+#define aesni_ocb_cipher aes_ocb_cipher
+static int aesni_ocb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+               const unsigned char *in, size_t len);
+#endif /* OPENSSL_NO_OCB */
+
 #define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
 static const EVP_CIPHER aesni_##keylen##_##mode = { \
        nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
@@ -836,6 +909,59 @@ static int aes_t4_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 static int aes_t4_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                const unsigned char *in, size_t len);
 
+#ifndef OPENSSL_NO_OCB
+static int aes_t4_ocb_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+                        const unsigned char *iv, int enc)
+       {
+       EVP_AES_OCB_CTX *octx = ctx->cipher_data;
+       if (!iv && !key)
+               return 1;
+       if (key)
+               {
+               do
+                       {
+                       /* We set both the encrypt and decrypt key here because decrypt
+                        * needs both. We could possibly optimise to remove setting the
+                        * decrypt for an encryption operation.
+                        */
+                       aes_t4_set_encrypt_key(key, ctx->key_len * 8, &octx->ksenc);
+                       aes_t4_set_decrypt_key(key, ctx->key_len * 8, &octx->ksdec);
+                       if(!CRYPTO_ocb128_init(&octx->ocb, &octx->ksenc, &octx->ksdec,
+                                       (block128_f)aes_t4_encrypt, (block128_f)aes_t4_decrypt))
+                               return 0;
+                       }
+               while (0);
+
+               /* If we have an iv we can set it directly, otherwise use
+                * saved IV.
+                */
+               if (iv == NULL && octx->iv_set)
+                       iv = octx->iv;
+               if (iv)
+                       {
+                       if(CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen) != 1)
+                               return 0;
+                       octx->iv_set = 1;
+                       }
+               octx->key_set = 1;
+               }
+       else
+               {
+               /* If key set use IV, otherwise copy */
+               if (octx->key_set)
+                       CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen);
+               else
+                       memcpy(octx->iv, iv, octx->ivlen);
+               octx->iv_set = 1;
+               }
+       return 1;
+       }
+
+#define aes_t4_ocb_cipher aes_ocb_cipher
+static int aes_t4_ocb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+               const unsigned char *in, size_t len);
+#endif /* OPENSSL_NO_OCB */
+
 #define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
 static const EVP_CIPHER aes_t4_##keylen##_##mode = { \
        nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
@@ -1159,9 +1285,9 @@ static int aes_ctr_cipher (EVP_CIPHER_CTX *ctx, unsigned char *out,
        return 1;
 }
 
-BLOCK_CIPHER_generic_pack(NID_aes,128,EVP_CIPH_FLAG_FIPS)
-BLOCK_CIPHER_generic_pack(NID_aes,192,EVP_CIPH_FLAG_FIPS)
-BLOCK_CIPHER_generic_pack(NID_aes,256,EVP_CIPH_FLAG_FIPS)
+BLOCK_CIPHER_generic_pack(NID_aes,128,0)
+BLOCK_CIPHER_generic_pack(NID_aes,192,0)
+BLOCK_CIPHER_generic_pack(NID_aes,256,0)
 
 static int aes_gcm_cleanup(EVP_CIPHER_CTX *c)
        {
@@ -1204,11 +1330,6 @@ static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
        case EVP_CTRL_GCM_SET_IVLEN:
                if (arg <= 0)
                        return 0;
-#ifdef OPENSSL_FIPS
-               if (FIPS_module_mode() && !(c->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)
-                                                && arg < 12)
-                       return 0;
-#endif
                /* Allocate memory for IV if needed */
                if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen))
                        {
@@ -1297,6 +1418,28 @@ static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
                /* Extra padding: tag appended to record */
                return EVP_GCM_TLS_TAG_LEN;
 
+       case EVP_CTRL_COPY:
+               {
+                       EVP_CIPHER_CTX *out = ptr;
+                       EVP_AES_GCM_CTX *gctx_out = out->cipher_data;
+                       if (gctx->gcm.key)
+                               {
+                               if (gctx->gcm.key != &gctx->ks)
+                                       return 0;
+                               gctx_out->gcm.key = &gctx_out->ks;
+                               }
+                       if (gctx->iv == c->iv)
+                               gctx_out->iv = out->iv;
+                       else
+                       {
+                               gctx_out->iv = OPENSSL_malloc(gctx->ivlen);
+                               if (!gctx_out->iv)
+                                       return 0;
+                               memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
+                       }
+                       return 1;
+               }
+
        default:
                return -1;
 
@@ -1686,19 +1829,38 @@ static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 
 #define CUSTOM_FLAGS   (EVP_CIPH_FLAG_DEFAULT_ASN1 \
                | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
-               | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT)
+               | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
+               | EVP_CIPH_CUSTOM_COPY)
 
 BLOCK_CIPHER_custom(NID_aes,128,1,12,gcm,GCM,
-               EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
+               EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
 BLOCK_CIPHER_custom(NID_aes,192,1,12,gcm,GCM,
-               EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
+               EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
 BLOCK_CIPHER_custom(NID_aes,256,1,12,gcm,GCM,
-               EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
+               EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
 
 static int aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
        {
        EVP_AES_XTS_CTX *xctx = c->cipher_data;
-       if (type != EVP_CTRL_INIT)
+       if (type == EVP_CTRL_COPY)
+               {
+               EVP_CIPHER_CTX *out = ptr;
+               EVP_AES_XTS_CTX *xctx_out = out->cipher_data;
+               if (xctx->xts.key1)
+                       {
+                       if (xctx->xts.key1 != &xctx->ks1)
+                               return 0;
+                       xctx_out->xts.key1 = &xctx_out->ks1;
+                       }
+               if (xctx->xts.key2)
+                       {
+                       if (xctx->xts.key2 != &xctx->ks2)
+                               return 0;
+                       xctx_out->xts.key2 = &xctx_out->ks2;
+                       }
+               return 1;
+               }
+       else if (type != EVP_CTRL_INIT)
                return -1;
        /* key1 and key2 are used as an indicator both key and IV are set */
        xctx->xts.key1 = NULL;
@@ -1809,15 +1971,6 @@ static int aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                return 0;
        if (!out || !in || len<AES_BLOCK_SIZE)
                return 0;
-#ifdef OPENSSL_FIPS
-       /* Requirement of SP800-38E */
-       if (FIPS_module_mode() && !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW) &&
-                       (len > (1UL<<20)*16))
-               {
-               EVPerr(EVP_F_AES_XTS_CIPHER, EVP_R_TOO_LARGE);
-               return 0;
-               }
-#endif
        if (xctx->stream)
                (*xctx->stream)(in, out, len,
                                xctx->xts.key1, xctx->xts.key2, ctx->iv);
@@ -1830,10 +1983,11 @@ static int aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 #define aes_xts_cleanup NULL
 
 #define XTS_FLAGS      (EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV \
-                        | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT)
+                        | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
+                        | EVP_CIPH_CUSTOM_COPY)
 
-BLOCK_CIPHER_custom(NID_aes,128,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|XTS_FLAGS)
-BLOCK_CIPHER_custom(NID_aes,256,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|XTS_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,128,1,16,xts,XTS,XTS_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,256,1,16,xts,XTS,XTS_FLAGS)
 
 static int aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
        {
@@ -1880,6 +2034,19 @@ static int aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
                cctx->len_set = 0;
                return 1;
 
+       case EVP_CTRL_COPY:
+               {
+                       EVP_CIPHER_CTX *out = ptr;
+                       EVP_AES_CCM_CTX *cctx_out = out->cipher_data;
+                       if (cctx->ccm.key)
+                               {
+                               if (cctx->ccm.key != &cctx->ks)
+                                       return 0;
+                               cctx_out->ccm.key = &cctx_out->ks;
+                               }
+                       return 1;
+               }
+
        default:
                return -1;
 
@@ -2002,9 +2169,9 @@ static int aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 
 #define aes_ccm_cleanup NULL
 
-BLOCK_CIPHER_custom(NID_aes,128,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
-BLOCK_CIPHER_custom(NID_aes,192,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
-BLOCK_CIPHER_custom(NID_aes,256,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,128,1,12,ccm,CCM,CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,192,1,12,ccm,CCM,CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,256,1,12,ccm,CCM,CUSTOM_FLAGS)
 
 typedef struct
        {
@@ -2030,7 +2197,7 @@ static int aes_wrap_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                }
        if (iv)
                {
-               memcpy(ctx->iv, iv, 8);
+               memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
                wctx->iv = ctx->iv;
                }
        return 1;
@@ -2041,23 +2208,62 @@ static int aes_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
        {
        EVP_AES_WRAP_CTX *wctx = ctx->cipher_data;
        size_t rv;
-       if (inlen % 8)
+       /* AES wrap with padding has IV length of 4, without padding 8 */
+       int pad = EVP_CIPHER_CTX_iv_length(ctx) == 4;
+       /* No final operation so always return zero length */
+       if (!in)
                return 0;
+       /* Input length must always be non-zero */
+       if (!inlen)
+               return -1;
+       /* If decrypting need at least 16 bytes and multiple of 8 */
+       if (!ctx->encrypt && (inlen < 16 || inlen & 0x7))
+               return -1;
+       /* If not padding input must be multiple of 8 */
+       if (!pad && inlen & 0x7)
+               return -1;
        if (!out)
                {
                if (ctx->encrypt)
+                       {
+                       /* If padding round up to multiple of 8 */
+                       if (pad)
+                               inlen = (inlen + 7)/8 * 8;
+                       /* 8 byte prefix */
                        return inlen + 8;
+                       }
                else
+                       {
+                       /* If not padding output will be exactly 8 bytes
+                        * smaller than input. If padding it will be at
+                        * least 8 bytes smaller but we don't know how
+                        * much.
+                        */
                        return inlen - 8;
+                       }
                }
-       if (!in)
-               return 0;
-       if (ctx->encrypt)
-               rv = CRYPTO_128_wrap(&wctx->ks.ks, wctx->iv, out, in, inlen,
+       if (pad)
+               {
+               if (ctx->encrypt)
+                       rv = CRYPTO_128_wrap_pad(&wctx->ks.ks, wctx->iv,
+                                               out, in, inlen,
                                                (block128_f)AES_encrypt);
+               else
+                       rv = CRYPTO_128_unwrap_pad(&wctx->ks.ks, wctx->iv,
+                                               out, in, inlen,
+                                               (block128_f)AES_decrypt);
+               }
        else
-               rv = CRYPTO_128_unwrap(&wctx->ks.ks, wctx->iv, out, in, inlen,
+               {
+               if (ctx->encrypt)
+                       rv = CRYPTO_128_wrap(&wctx->ks.ks, wctx->iv,
+                                               out, in, inlen,
+                                               (block128_f)AES_encrypt);
+               else
+                       rv = CRYPTO_128_unwrap(&wctx->ks.ks, wctx->iv,
+                                               out, in, inlen,
                                                (block128_f)AES_decrypt);
+               }
        return rv ? (int)rv : -1;
        }
 
@@ -2069,7 +2275,7 @@ static const EVP_CIPHER aes_128_wrap = {
        NID_id_aes128_wrap,
        8, 16, 8, WRAP_FLAGS,
        aes_wrap_init_key, aes_wrap_cipher,
-       NULL,   
+       NULL,
        sizeof(EVP_AES_WRAP_CTX),
        NULL,NULL,NULL,NULL };
 
@@ -2082,7 +2288,7 @@ static const EVP_CIPHER aes_192_wrap = {
        NID_id_aes192_wrap,
        8, 24, 8, WRAP_FLAGS,
        aes_wrap_init_key, aes_wrap_cipher,
-       NULL,   
+       NULL,
        sizeof(EVP_AES_WRAP_CTX),
        NULL,NULL,NULL,NULL };
 
@@ -2095,7 +2301,7 @@ static const EVP_CIPHER aes_256_wrap = {
        NID_id_aes256_wrap,
        8, 32, 8, WRAP_FLAGS,
        aes_wrap_init_key, aes_wrap_cipher,
-       NULL,   
+       NULL,
        sizeof(EVP_AES_WRAP_CTX),
        NULL,NULL,NULL,NULL };
 
@@ -2104,4 +2310,330 @@ const EVP_CIPHER *EVP_aes_256_wrap(void)
        return &aes_256_wrap;
        }
 
+static const EVP_CIPHER aes_128_wrap_pad = {
+       NID_id_aes128_wrap_pad,
+       8, 16, 4, WRAP_FLAGS,
+       aes_wrap_init_key, aes_wrap_cipher,
+       NULL,
+       sizeof(EVP_AES_WRAP_CTX),
+       NULL,NULL,NULL,NULL };
+
+const EVP_CIPHER *EVP_aes_128_wrap_pad(void)
+       {
+       return &aes_128_wrap_pad;
+       }
+
+static const EVP_CIPHER aes_192_wrap_pad = {
+       NID_id_aes192_wrap_pad,
+       8, 24, 4, WRAP_FLAGS,
+       aes_wrap_init_key, aes_wrap_cipher,
+       NULL,
+       sizeof(EVP_AES_WRAP_CTX),
+       NULL,NULL,NULL,NULL };
+
+const EVP_CIPHER *EVP_aes_192_wrap_pad(void)
+       {
+       return &aes_192_wrap_pad;
+       }
+
+static const EVP_CIPHER aes_256_wrap_pad = {
+       NID_id_aes256_wrap_pad,
+       8, 32, 4, WRAP_FLAGS,
+       aes_wrap_init_key, aes_wrap_cipher,
+       NULL,
+       sizeof(EVP_AES_WRAP_CTX),
+       NULL,NULL,NULL,NULL };
+
+const EVP_CIPHER *EVP_aes_256_wrap_pad(void)
+       {
+       return &aes_256_wrap_pad;
+       }
+
+#ifndef OPENSSL_NO_OCB
+static int aes_ocb_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
+       {
+       EVP_AES_OCB_CTX *octx = c->cipher_data;
+       EVP_CIPHER_CTX *newc;
+       EVP_AES_OCB_CTX *new_octx;
+
+       switch (type)
+               {
+       case EVP_CTRL_INIT:
+               octx->key_set = 0;
+               octx->iv_set = 0;
+               octx->ivlen = c->cipher->iv_len;
+               octx->iv = c->iv;
+               octx->taglen = 16;
+               octx->data_buf_len = 0;
+               octx->aad_buf_len = 0;
+               return 1;
+
+       case EVP_CTRL_SET_IVLEN:
+               /* IV len must be 1 to 15 */
+               if (arg <= 0 || arg > 15)
+                       return 0;
+
+               octx->ivlen = arg;
+               return 1;
+
+       case EVP_CTRL_OCB_SET_TAGLEN:
+               /* Tag len must be 0 to 16 */
+               if (arg < 0 || arg > 16)
+                       return 0;
+
+               octx->taglen = arg;
+               return 1;
+
+       case EVP_CTRL_SET_TAG:
+               if (arg != octx->taglen || c->encrypt)
+                       return 0;
+               memcpy(octx->tag, ptr, arg);
+               return 1;
+
+       case EVP_CTRL_GET_TAG:
+               if (arg != octx->taglen || !c->encrypt)
+                       return 0;
+
+               memcpy(ptr, octx->tag, arg);
+               return 1;
+
+       case EVP_CTRL_COPY:
+               newc = (EVP_CIPHER_CTX *)ptr;
+               new_octx = newc->cipher_data;
+               return CRYPTO_ocb128_copy_ctx(&new_octx->ocb, &octx->ocb,
+                       &new_octx->ksenc, &new_octx->ksdec);
+
+       default:
+               return -1;
+
+               }
+       }
+
+
+static int aes_ocb_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+               const unsigned char *iv, int enc)
+       {
+       EVP_AES_OCB_CTX *octx = ctx->cipher_data;
+       if (!iv && !key)
+               return 1;
+       if (key)
+               {
+               do
+                       {
+                       /* We set both the encrypt and decrypt key here because decrypt
+                        * needs both. We could possibly optimise to remove setting the
+                        * decrypt for an encryption operation.
+                        */
+#ifdef VPAES_CAPABLE
+                       if (VPAES_CAPABLE)
+                               {
+                               vpaes_set_encrypt_key(key,ctx->key_len*8,&octx->ksenc);
+                               vpaes_set_decrypt_key(key,ctx->key_len*8,&octx->ksdec);
+                               if(!CRYPTO_ocb128_init(&octx->ocb,&octx->ksenc,&octx->ksdec,
+                                               (block128_f)vpaes_encrypt,(block128_f)vpaes_decrypt))
+                                       return 0;
+                               break;
+                               }
+#endif
+                       AES_set_encrypt_key(key, ctx->key_len * 8, &octx->ksenc);
+                       AES_set_decrypt_key(key, ctx->key_len * 8, &octx->ksdec);
+                       if(!CRYPTO_ocb128_init(&octx->ocb, &octx->ksenc, &octx->ksdec,
+                                       (block128_f)AES_encrypt, (block128_f)AES_decrypt))
+                               return 0;
+                       }
+               while (0);
+
+               /* If we have an iv we can set it directly, otherwise use
+                * saved IV.
+                */
+               if (iv == NULL && octx->iv_set)
+                       iv = octx->iv;
+               if (iv)
+                       {
+                       if(CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen) != 1)
+                               return 0;
+                       octx->iv_set = 1;
+                       }
+               octx->key_set = 1;
+               }
+       else
+               {
+               /* If key set use IV, otherwise copy */
+               if (octx->key_set)
+                       CRYPTO_ocb128_setiv(&octx->ocb, iv, octx->ivlen, octx->taglen);
+               else
+                       memcpy(octx->iv, iv, octx->ivlen);
+               octx->iv_set = 1;
+               }
+       return 1;
+       }
+
+static int aes_ocb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+               const unsigned char *in, size_t len)
+       {
+       unsigned char *buf;
+       int *buf_len;
+       int written_len = 0;
+       size_t trailing_len;
+       EVP_AES_OCB_CTX *octx = ctx->cipher_data;
+
+       /* If IV or Key not set then return error */
+       if (!octx->iv_set)
+               return -1;
+
+       if (!octx->key_set)
+               return -1;
+
+       if (in)
+               {
+               /* Need to ensure we are only passing full blocks to low level OCB
+                * routines. We do it here rather than in EVP_EncryptUpdate/
+                * EVP_DecryptUpdate because we need to pass full blocks of AAD too
+                * and those routines don't support that
+                */
+
+               /* Are we dealing with AAD or normal data here? */
+               if (out == NULL)
+                       {
+                       buf = octx->aad_buf;
+                       buf_len = &(octx->aad_buf_len);
+                       }
+               else
+                       {
+                       buf = octx->data_buf;
+                       buf_len = &(octx->data_buf_len);
+                       }
+
+               /* If we've got a partially filled buffer from a previous call then use
+                * that data first
+                */
+               if(*buf_len)
+                       {
+                       unsigned int remaining;
+
+                       remaining = 16 - (*buf_len);
+                       if(remaining > len)
+                               {
+                               memcpy(buf+(*buf_len), in, len);
+                               *(buf_len)+=len;
+                               return 0;
+                               }
+                       memcpy(buf+(*buf_len), in, remaining);
+
+                       /* If we get here we've filled the buffer, so process it */
+                       len -= remaining;
+                       in += remaining;
+                       if (out == NULL)
+                               {
+                               if(!CRYPTO_ocb128_aad(&octx->ocb, buf, 16))
+                                       return -1;
+                               }
+                       else if (ctx->encrypt)
+                               {
+                               if(!CRYPTO_ocb128_encrypt(&octx->ocb, buf, out, 16))
+                                       return -1;
+                               }
+                       else
+                               {
+                               if(!CRYPTO_ocb128_decrypt(&octx->ocb, buf, out, 16))
+                                       return -1;
+                               }
+                       written_len = 16;
+                       *buf_len = 0;
+                       }
+
+               /* Do we have a partial block to handle at the end? */
+               trailing_len = len % 16;
+
+               /* If we've got some full blocks to handle, then process these first */
+               if(len != trailing_len)
+                       {
+                       if (out == NULL)
+                               {
+                               if(!CRYPTO_ocb128_aad(&octx->ocb, in, len-trailing_len))
+                                       return -1;
+                               }
+                       else if (ctx->encrypt)
+                               {
+                               if(!CRYPTO_ocb128_encrypt(&octx->ocb, in, out, len-trailing_len))
+                                       return -1;
+                               }
+                       else
+                               {
+                               if(!CRYPTO_ocb128_decrypt(&octx->ocb, in, out, len-trailing_len))
+                                       return -1;
+                               }
+                       written_len += len-trailing_len;
+                       in += len-trailing_len;
+                       }
+
+               /* Handle any trailing partial block */
+               if(trailing_len)
+                       {
+                       memcpy(buf, in, trailing_len);
+                       *buf_len = trailing_len;
+                       }
+
+               return written_len;
+               }
+       else
+               {
+               /* First of all empty the buffer of any partial block that we might
+                * have been provided - both for data and AAD
+                */
+               if(octx->data_buf_len)
+                       {
+                       if (ctx->encrypt)
+                               {
+                               if(!CRYPTO_ocb128_encrypt(&octx->ocb, octx->data_buf, out,
+                                               octx->data_buf_len))
+                                       return -1;
+                               }
+                       else
+                               {
+                               if(!CRYPTO_ocb128_decrypt(&octx->ocb, octx->data_buf, out,
+                                               octx->data_buf_len))
+                                       return -1;
+                               }
+                       written_len = octx->data_buf_len;
+                       octx->data_buf_len = 0;
+                       }
+               if(octx->aad_buf_len)
+                       {
+                       if(!CRYPTO_ocb128_aad(&octx->ocb, octx->aad_buf, octx->aad_buf_len))
+                               return -1;
+                       octx->aad_buf_len = 0;
+                       }
+               /* If decrypting then verify */
+               if (!ctx->encrypt)
+                       {
+                       if (octx->taglen < 0)
+                               return -1;
+                       if (CRYPTO_ocb128_finish(&octx->ocb,
+                                       octx->tag, octx->taglen) != 0)
+                               return -1;
+                       octx->iv_set = 0;
+                       return written_len;
+                       }
+               /* If encrypting then just get the tag */
+               if(CRYPTO_ocb128_tag(&octx->ocb, octx->tag, 16) != 1)
+                       return -1;
+               /* Don't reuse the IV */
+               octx->iv_set = 0;
+               return written_len;
+               }
+       }
+
+static int aes_ocb_cleanup(EVP_CIPHER_CTX *c)
+       {
+       EVP_AES_OCB_CTX *octx = c->cipher_data;
+       CRYPTO_ocb128_cleanup(&octx->ocb);
+       return 1;
+       }
+
+BLOCK_CIPHER_custom(NID_aes,128,16,12,ocb,OCB,CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,192,16,12,ocb,OCB,CUSTOM_FLAGS)
+BLOCK_CIPHER_custom(NID_aes,256,16,12,ocb,OCB,CUSTOM_FLAGS)
+#endif /* OPENSSL_NO_OCB */
+
 #endif