/* public api for steve reid's public domain SHA-1 implementation */ /* this file is in the public domain */ #ifndef __SHA1_H #define __SHA1_H /* SHA1_DIGEST_SIZE must always be visible regardless of OpenSSL. */ #define SHA1_DIGEST_SIZE 20 /* * When OpenSSL headers are already present, their SHA1_Init/Update/Final * declarations take precedence. Redeclaring with incompatible signatures * causes compile errors in consumers (e.g. nginx) that include both * lscapi.h and OpenSSL. Use OpenSSL's SHA_CTX as an alias so internal * callers that hold a SHA1_CTX* still work. * * Guard macros differ by OpenSSL version: * OpenSSL 1.1.x -> HEADER_SHA_H * OpenSSL 3.x -> OPENSSL_SHA_H */ #if !defined(OPENSSL_SHA_H) && !defined(HEADER_SHA_H) #include #ifdef __cplusplus extern "C" { #endif typedef struct { uint32_t state[5]; uint32_t count[2]; uint8_t buffer[64]; } SHA1_CTX; void SHA1_Init(SHA1_CTX* context); void SHA1_Update(SHA1_CTX* context, const uint8_t* data, const size_t len); void SHA1_Final(SHA1_CTX* context, uint8_t digest[SHA1_DIGEST_SIZE]); #ifdef __cplusplus } #endif #else /* OpenSSL sha.h already included */ /* openssl/sha.h is already loaded; avoid redeclaring SHA1_* with * incompatible types. Alias SHA1_CTX to OpenSSL's SHA_CTX so any * code holding a pointer to SHA1_CTX still compiles. */ #include typedef SHA_CTX SHA1_CTX; #endif /* !OPENSSL_SHA_H && !HEADER_SHA_H */ #endif /* __SHA1_H */