Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * cryptohashfuncs.c
4 : * Cryptographic hash functions
5 : *
6 : * Portions Copyright (c) 2018-2024, PostgreSQL Global Development Group
7 : *
8 : *
9 : * IDENTIFICATION
10 : * src/backend/utils/adt/cryptohashfuncs.c
11 : *
12 : *-------------------------------------------------------------------------
13 : */
14 : #include "postgres.h"
15 :
16 : #include "common/cryptohash.h"
17 : #include "common/md5.h"
18 : #include "common/sha2.h"
19 : #include "utils/builtins.h"
20 : #include "varatt.h"
21 :
22 :
23 : /*
24 : * MD5
25 : */
26 :
27 : /* MD5 produces a 16 byte (128 bit) hash; double it for hex */
28 : #define MD5_HASH_LEN 32
29 :
30 : /*
31 : * Create an MD5 hash of a text value and return it as hex string.
32 : */
33 : Datum
34 46 : md5_text(PG_FUNCTION_ARGS)
35 : {
36 46 : text *in_text = PG_GETARG_TEXT_PP(0);
37 : size_t len;
38 : char hexsum[MD5_HASH_LEN + 1];
39 46 : const char *errstr = NULL;
40 :
41 : /* Calculate the length of the buffer using varlena metadata */
42 46 : len = VARSIZE_ANY_EXHDR(in_text);
43 :
44 : /* get the hash result */
45 46 : if (pg_md5_hash(VARDATA_ANY(in_text), len, hexsum, &errstr) == false)
46 0 : ereport(ERROR,
47 : (errcode(ERRCODE_INTERNAL_ERROR),
48 : errmsg("could not compute %s hash: %s", "MD5",
49 : errstr)));
50 :
51 : /* convert to text and return it */
52 46 : PG_RETURN_TEXT_P(cstring_to_text(hexsum));
53 : }
54 :
55 : /*
56 : * Create an MD5 hash of a bytea value and return it as a hex string.
57 : */
58 : Datum
59 42 : md5_bytea(PG_FUNCTION_ARGS)
60 : {
61 42 : bytea *in = PG_GETARG_BYTEA_PP(0);
62 : size_t len;
63 : char hexsum[MD5_HASH_LEN + 1];
64 42 : const char *errstr = NULL;
65 :
66 42 : len = VARSIZE_ANY_EXHDR(in);
67 42 : if (pg_md5_hash(VARDATA_ANY(in), len, hexsum, &errstr) == false)
68 0 : ereport(ERROR,
69 : (errcode(ERRCODE_INTERNAL_ERROR),
70 : errmsg("could not compute %s hash: %s", "MD5",
71 : errstr)));
72 :
73 42 : PG_RETURN_TEXT_P(cstring_to_text(hexsum));
74 : }
75 :
76 : /*
77 : * Internal routine to compute a cryptohash with the given bytea input.
78 : */
79 : static inline bytea *
80 844898 : cryptohash_internal(pg_cryptohash_type type, bytea *input)
81 : {
82 : const uint8 *data;
83 844898 : const char *typestr = NULL;
84 844898 : int digest_len = 0;
85 : size_t len;
86 : pg_cryptohash_ctx *ctx;
87 : bytea *result;
88 :
89 844898 : switch (type)
90 : {
91 12 : case PG_SHA224:
92 12 : typestr = "SHA224";
93 12 : digest_len = PG_SHA224_DIGEST_LENGTH;
94 12 : break;
95 844862 : case PG_SHA256:
96 844862 : typestr = "SHA256";
97 844862 : digest_len = PG_SHA256_DIGEST_LENGTH;
98 844862 : break;
99 12 : case PG_SHA384:
100 12 : typestr = "SHA384";
101 12 : digest_len = PG_SHA384_DIGEST_LENGTH;
102 12 : break;
103 12 : case PG_SHA512:
104 12 : typestr = "SHA512";
105 12 : digest_len = PG_SHA512_DIGEST_LENGTH;
106 12 : break;
107 0 : case PG_MD5:
108 : case PG_SHA1:
109 0 : elog(ERROR, "unsupported cryptohash type %d", type);
110 : break;
111 : }
112 :
113 844898 : result = palloc0(digest_len + VARHDRSZ);
114 844898 : len = VARSIZE_ANY_EXHDR(input);
115 844898 : data = (unsigned char *) VARDATA_ANY(input);
116 :
117 844898 : ctx = pg_cryptohash_create(type);
118 844898 : if (pg_cryptohash_init(ctx) < 0)
119 0 : elog(ERROR, "could not initialize %s context: %s", typestr,
120 : pg_cryptohash_error(ctx));
121 844898 : if (pg_cryptohash_update(ctx, data, len) < 0)
122 0 : elog(ERROR, "could not update %s context: %s", typestr,
123 : pg_cryptohash_error(ctx));
124 844898 : if (pg_cryptohash_final(ctx, (unsigned char *) VARDATA(result),
125 : digest_len) < 0)
126 0 : elog(ERROR, "could not finalize %s context: %s", typestr,
127 : pg_cryptohash_error(ctx));
128 844898 : pg_cryptohash_free(ctx);
129 :
130 844898 : SET_VARSIZE(result, digest_len + VARHDRSZ);
131 :
132 844898 : return result;
133 : }
134 :
135 : /*
136 : * SHA-2 variants
137 : */
138 :
139 : Datum
140 12 : sha224_bytea(PG_FUNCTION_ARGS)
141 : {
142 12 : bytea *result = cryptohash_internal(PG_SHA224, PG_GETARG_BYTEA_PP(0));
143 :
144 12 : PG_RETURN_BYTEA_P(result);
145 : }
146 :
147 : Datum
148 844862 : sha256_bytea(PG_FUNCTION_ARGS)
149 : {
150 844862 : bytea *result = cryptohash_internal(PG_SHA256, PG_GETARG_BYTEA_PP(0));
151 :
152 844862 : PG_RETURN_BYTEA_P(result);
153 : }
154 :
155 : Datum
156 12 : sha384_bytea(PG_FUNCTION_ARGS)
157 : {
158 12 : bytea *result = cryptohash_internal(PG_SHA384, PG_GETARG_BYTEA_PP(0));
159 :
160 12 : PG_RETURN_BYTEA_P(result);
161 : }
162 :
163 : Datum
164 12 : sha512_bytea(PG_FUNCTION_ARGS)
165 : {
166 12 : bytea *result = cryptohash_internal(PG_SHA512, PG_GETARG_BYTEA_PP(0));
167 :
168 12 : PG_RETURN_BYTEA_P(result);
169 : }
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