1 /* ====================================================================
2 * Copyright (c) 2002-2006 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
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13 * the documentation and/or other materials provided with the
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17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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32 * "This product includes software developed by the OpenSSL Project
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47 * ==================================================================== */
49 #ifndef OPENSSL_HEADER_AES_H
50 #define OPENSSL_HEADER_AES_H
52 #include <openssl/base.h>
54 #if defined(__cplusplus)
65 // AES_MAXNR is the maximum number of AES rounds.
68 #define AES_BLOCK_SIZE 16
70 // aes_key_st should be an opaque type, but EVP requires that the size be
73 uint32_t rd_key[4 * (AES_MAXNR + 1)];
76 typedef struct aes_key_st AES_KEY;
78 // AES_set_encrypt_key configures |aeskey| to encrypt with the |bits|-bit key,
81 // WARNING: unlike other OpenSSL functions, this returns zero on success and a
82 // negative number on error.
83 OPENSSL_EXPORT int AES_set_encrypt_key(const uint8_t *key, unsigned bits,
86 // AES_set_decrypt_key configures |aeskey| to decrypt with the |bits|-bit key,
89 // WARNING: unlike other OpenSSL functions, this returns zero on success and a
90 // negative number on error.
91 OPENSSL_EXPORT int AES_set_decrypt_key(const uint8_t *key, unsigned bits,
94 // AES_encrypt encrypts a single block from |in| to |out| with |key|. The |in|
95 // and |out| pointers may overlap.
96 OPENSSL_EXPORT void AES_encrypt(const uint8_t *in, uint8_t *out,
99 // AES_decrypt decrypts a single block from |in| to |out| with |key|. The |in|
100 // and |out| pointers may overlap.
101 OPENSSL_EXPORT void AES_decrypt(const uint8_t *in, uint8_t *out,
105 // Block cipher modes.
107 // AES_ctr128_encrypt encrypts (or decrypts, it's the same in CTR mode) |len|
108 // bytes from |in| to |out|. The |num| parameter must be set to zero on the
109 // first call and |ivec| will be incremented.
110 OPENSSL_EXPORT void AES_ctr128_encrypt(const uint8_t *in, uint8_t *out,
111 size_t len, const AES_KEY *key,
112 uint8_t ivec[AES_BLOCK_SIZE],
113 uint8_t ecount_buf[AES_BLOCK_SIZE],
116 // AES_ecb_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) a single,
117 // 16 byte block from |in| to |out|.
118 OPENSSL_EXPORT void AES_ecb_encrypt(const uint8_t *in, uint8_t *out,
119 const AES_KEY *key, const int enc);
121 // AES_cbc_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) |len|
122 // bytes from |in| to |out|. The length must be a multiple of the block size.
123 OPENSSL_EXPORT void AES_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t len,
124 const AES_KEY *key, uint8_t *ivec,
127 // AES_ofb128_encrypt encrypts (or decrypts, it's the same in OFB mode) |len|
128 // bytes from |in| to |out|. The |num| parameter must be set to zero on the
130 OPENSSL_EXPORT void AES_ofb128_encrypt(const uint8_t *in, uint8_t *out,
131 size_t len, const AES_KEY *key,
132 uint8_t *ivec, int *num);
134 // AES_cfb128_encrypt encrypts (or decrypts, if |enc| == |AES_DECRYPT|) |len|
135 // bytes from |in| to |out|. The |num| parameter must be set to zero on the
137 OPENSSL_EXPORT void AES_cfb128_encrypt(const uint8_t *in, uint8_t *out,
138 size_t len, const AES_KEY *key,
139 uint8_t *ivec, int *num, int enc);
144 // These functions implement AES Key Wrap mode, as defined in RFC 3394. They
145 // should never be used except to interoperate with existing systems that use
148 // AES_wrap_key performs AES key wrap on |in| which must be a multiple of 8
149 // bytes. |iv| must point to an 8 byte value or be NULL to use the default IV.
150 // |key| must have been configured for encryption. On success, it writes
151 // |in_len| + 8 bytes to |out| and returns |in_len| + 8. Otherwise, it returns
153 OPENSSL_EXPORT int AES_wrap_key(const AES_KEY *key, const uint8_t *iv,
154 uint8_t *out, const uint8_t *in, size_t in_len);
156 // AES_unwrap_key performs AES key unwrap on |in| which must be a multiple of 8
157 // bytes. |iv| must point to an 8 byte value or be NULL to use the default IV.
158 // |key| must have been configured for decryption. On success, it writes
159 // |in_len| - 8 bytes to |out| and returns |in_len| - 8. Otherwise, it returns
161 OPENSSL_EXPORT int AES_unwrap_key(const AES_KEY *key, const uint8_t *iv,
162 uint8_t *out, const uint8_t *in,
166 #if defined(__cplusplus)
170 #endif // OPENSSL_HEADER_AES_H