30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
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typedef struct hmac_context {
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void (*init_hash)(const struct hmac_context *context);
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void (*update_hash)(const struct hmac_context *context,
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const uint8_t *message,
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unsigned message_size);
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void (*finish_hash)(const struct hmac_context *context, uint8_t *hash_result);
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unsigned block_size; /* Hash function block size in bytes, eg 64 for SHA-256. */
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unsigned result_size; /* Hash function result size in bytes, eg 32 for SHA-256. */
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uint8_t *tmp; /* Must point to a buffer of at least (2 * result_size + block_size) bytes. */
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} hmac_context;
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typedef struct hmac_sha256_context {
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hmac_context hmac_ctx;
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sha256_context sha_ctx;
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uint8_t tmp[32 * 2 + 64];
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} hmac_sha256_context;
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void
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hmac_sha256_init (hmac_sha256_context *ctx, const uint8_t *K);
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void
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hmac_sha256_update (const hmac_sha256_context *ctx, const uint8_t *message,
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unsigned message_size);
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void
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hmac_sha256_finish (const hmac_sha256_context *ctx, const uint8_t *K,
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uint8_t *hash_result);
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