68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
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#ifndef _AES_H_
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#define _AES_H_
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#include <stdint.h>
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#include <stddef.h>
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#ifndef CBC
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#define CBC 1
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#endif
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#ifndef ECB
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#define ECB 1
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#endif
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#ifndef CTR
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#define CTR 1
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#endif
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#define AES128 1
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//#define AES192 1
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//#define AES256 1
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#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
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#if defined(AES256) && (AES256 == 1)
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#define AES_KEYLEN 32
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#define AES_keyExpSize 240
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#elif defined(AES192) && (AES192 == 1)
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#define AES_KEYLEN 24
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#define AES_keyExpSize 208
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#else
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#define AES_KEYLEN 16 // Key length in bytes
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#define AES_keyExpSize 176
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#endif
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struct AES_ctx {
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uint8_t RoundKey[AES_keyExpSize];
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#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
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uint8_t Iv[AES_BLOCKLEN];
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#endif
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};
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void AES_init_ctx(struct AES_ctx *ctx, const uint8_t * key);
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#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
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void AES_init_ctx_iv(struct AES_ctx *ctx, const uint8_t * key, const uint8_t * iv);
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void AES_ctx_set_iv(struct AES_ctx *ctx, const uint8_t * iv);
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#endif
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#if defined(ECB) && (ECB == 1)
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void AES_ECB_encrypt(const struct AES_ctx *ctx, uint8_t * buf);
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void AES_ECB_decrypt(const struct AES_ctx *ctx, uint8_t * buf);
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#endif // #if defined(ECB) && (ECB == !)
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#if defined(CBC) && (CBC == 1)
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void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);
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void AES_CBC_decrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);
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#endif // #if defined(CBC) && (CBC == 1)
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#if defined(CTR) && (CTR == 1)
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void AES_CTR_xcrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);
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#endif // #if defined(CTR) && (CTR == 1)
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#endif // _AES_H_
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