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81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
// See the file "COPYING" in the main distribution directory for copyright.
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/**
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* Wrapper and helper functions for MD5/SHA digest algorithms.
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*/
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#include "digest.h"
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#include "Reporter.h"
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EVP_MD_CTX* hash_init(HashAlgorithm alg)
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{
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EVP_MD_CTX* c = EVP_MD_CTX_new();
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const EVP_MD* md;
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switch (alg)
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{
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case Hash_MD5:
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#ifdef EVP_MD_CTX_FLAG_NON_FIPS_ALLOW
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/* Allow this to work even if FIPS disables it */
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EVP_MD_CTX_set_flags(c, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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#endif
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md = EVP_md5();
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break;
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case Hash_SHA1:
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md = EVP_sha1();
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break;
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case Hash_SHA224:
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md = EVP_sha224();
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break;
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case Hash_SHA256:
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md = EVP_sha256();
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break;
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case Hash_SHA384:
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md = EVP_sha384();
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break;
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case Hash_SHA512:
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md = EVP_sha512();
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break;
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default:
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zeek::reporter->InternalError("Unknown hash algorithm passed to hash_init");
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}
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if ( ! EVP_DigestInit_ex(c, md, NULL) )
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zeek::reporter->InternalError("EVP_DigestInit failed");
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return c;
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}
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void hash_update(EVP_MD_CTX* c, const void* data, unsigned long len)
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{
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if ( ! EVP_DigestUpdate(c, data, len) )
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zeek::reporter->InternalError("EVP_DigestUpdate failed");
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}
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void hash_final(EVP_MD_CTX* c, u_char* md)
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{
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if ( ! EVP_DigestFinal(c, md, NULL) )
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zeek::reporter->InternalError("EVP_DigestFinal failed");
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EVP_MD_CTX_free(c);
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}
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unsigned char* internal_md5(const unsigned char* data, unsigned long len, unsigned char* out)
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{
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return calculate_digest(Hash_MD5, data, len, out);
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}
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unsigned char* calculate_digest(HashAlgorithm alg, const unsigned char* data, uint64_t len, unsigned char* out)
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{
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// maximum possible length for supported hashes
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static unsigned char static_out[SHA512_DIGEST_LENGTH];
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if ( ! out )
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out = static_out; // use static array for return, see OpenSSL man page
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EVP_MD_CTX* c = hash_init(alg);
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hash_update(c, data, len);
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hash_final(c, out);
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return out;
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}
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