2 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/evp.h>
11 #include <openssl/core_numbers.h>
12 #include "internal/refcount.h"
15 * Don't free up md_ctx->pctx in EVP_MD_CTX_reset, use the reserved flag
18 #define EVP_MD_CTX_FLAG_KEEP_PKEY_CTX 0x0400
20 struct evp_pkey_ctx_st {
21 /* Method associated with this operation */
22 const EVP_PKEY_METHOD *pmeth;
23 /* Engine that implements this method or NULL if builtin */
25 /* Key: may be NULL */
27 /* Peer key for key agreement, may be NULL */
29 /* Actual operation */
31 /* Algorithm specific data */
33 /* Application specific data */
36 EVP_PKEY_gen_cb *pkey_gencb;
37 /* implementation specific keygen data */
39 int keygen_info_count;
40 } /* EVP_PKEY_CTX */ ;
42 #define EVP_PKEY_FLAG_DYNAMIC 1
44 struct evp_pkey_method_st {
47 int (*init) (EVP_PKEY_CTX *ctx);
48 int (*copy) (EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src);
49 void (*cleanup) (EVP_PKEY_CTX *ctx);
50 int (*paramgen_init) (EVP_PKEY_CTX *ctx);
51 int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
52 int (*keygen_init) (EVP_PKEY_CTX *ctx);
53 int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
54 int (*sign_init) (EVP_PKEY_CTX *ctx);
55 int (*sign) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
56 const unsigned char *tbs, size_t tbslen);
57 int (*verify_init) (EVP_PKEY_CTX *ctx);
58 int (*verify) (EVP_PKEY_CTX *ctx,
59 const unsigned char *sig, size_t siglen,
60 const unsigned char *tbs, size_t tbslen);
61 int (*verify_recover_init) (EVP_PKEY_CTX *ctx);
62 int (*verify_recover) (EVP_PKEY_CTX *ctx,
63 unsigned char *rout, size_t *routlen,
64 const unsigned char *sig, size_t siglen);
65 int (*signctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
66 int (*signctx) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
68 int (*verifyctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
69 int (*verifyctx) (EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
71 int (*encrypt_init) (EVP_PKEY_CTX *ctx);
72 int (*encrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
73 const unsigned char *in, size_t inlen);
74 int (*decrypt_init) (EVP_PKEY_CTX *ctx);
75 int (*decrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
76 const unsigned char *in, size_t inlen);
77 int (*derive_init) (EVP_PKEY_CTX *ctx);
78 int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
79 int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1, void *p2);
80 int (*ctrl_str) (EVP_PKEY_CTX *ctx, const char *type, const char *value);
81 int (*digestsign) (EVP_MD_CTX *ctx, unsigned char *sig, size_t *siglen,
82 const unsigned char *tbs, size_t tbslen);
83 int (*digestverify) (EVP_MD_CTX *ctx, const unsigned char *sig,
84 size_t siglen, const unsigned char *tbs,
86 int (*check) (EVP_PKEY *pkey);
87 int (*public_check) (EVP_PKEY *pkey);
88 int (*param_check) (EVP_PKEY *pkey);
90 int (*digest_custom) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
91 } /* EVP_PKEY_METHOD */ ;
93 DEFINE_STACK_OF_CONST(EVP_PKEY_METHOD)
95 void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx);
97 extern const EVP_PKEY_METHOD cmac_pkey_meth;
98 extern const EVP_PKEY_METHOD dh_pkey_meth;
99 extern const EVP_PKEY_METHOD dhx_pkey_meth;
100 extern const EVP_PKEY_METHOD dsa_pkey_meth;
101 extern const EVP_PKEY_METHOD ec_pkey_meth;
102 extern const EVP_PKEY_METHOD sm2_pkey_meth;
103 extern const EVP_PKEY_METHOD ecx25519_pkey_meth;
104 extern const EVP_PKEY_METHOD ecx448_pkey_meth;
105 extern const EVP_PKEY_METHOD ed25519_pkey_meth;
106 extern const EVP_PKEY_METHOD ed448_pkey_meth;
107 extern const EVP_PKEY_METHOD hmac_pkey_meth;
108 extern const EVP_PKEY_METHOD rsa_pkey_meth;
109 extern const EVP_PKEY_METHOD rsa_pss_pkey_meth;
110 extern const EVP_PKEY_METHOD scrypt_pkey_meth;
111 extern const EVP_PKEY_METHOD tls1_prf_pkey_meth;
112 extern const EVP_PKEY_METHOD hkdf_pkey_meth;
113 extern const EVP_PKEY_METHOD poly1305_pkey_meth;
114 extern const EVP_PKEY_METHOD siphash_pkey_meth;
116 /* struct evp_mac_impl_st is defined by the implementation */
117 typedef struct evp_mac_impl_st EVP_MAC_IMPL;
120 EVP_MAC_IMPL *(*new) (void);
121 EVP_MAC_IMPL *(*dup) (const EVP_MAC_IMPL *macsrc);
122 void (*free) (EVP_MAC_IMPL *macctx);
123 size_t (*size) (EVP_MAC_IMPL *macctx);
124 int (*init) (EVP_MAC_IMPL *macctx);
125 int (*update) (EVP_MAC_IMPL *macctx, const unsigned char *data,
127 int (*final) (EVP_MAC_IMPL *macctx, unsigned char *out);
128 int (*ctrl) (EVP_MAC_IMPL *macctx, int cmd, va_list args);
129 int (*ctrl_str) (EVP_MAC_IMPL *macctx, const char *type, const char *value);
132 extern const EVP_MAC blake2b_mac_meth;
133 extern const EVP_MAC blake2s_mac_meth;
134 extern const EVP_MAC cmac_meth;
135 extern const EVP_MAC gmac_meth;
136 extern const EVP_MAC hmac_meth;
137 extern const EVP_MAC kmac128_meth;
138 extern const EVP_MAC kmac256_meth;
139 extern const EVP_MAC siphash_meth;
140 extern const EVP_MAC poly1305_meth;
142 /* Internal keccak algorithms used for KMAC */
143 const EVP_MD *evp_keccak_kmac128(void);
144 const EVP_MD *evp_keccak_kmac256(void);
147 * This function is internal for now, but can be made external when needed.
148 * The documentation would read:
150 * EVP_add_mac() adds the MAC implementation C<mac> to the internal
153 int EVP_add_mac(const EVP_MAC *mac);
154 int EVP_add_kdf(const EVP_KDF *kdf);
156 /* struct evp_kdf_impl_st is defined by the implementation */
157 typedef struct evp_kdf_impl_st EVP_KDF_IMPL;
160 EVP_KDF_IMPL *(*new) (void);
161 void (*free) (EVP_KDF_IMPL *impl);
162 void (*reset) (EVP_KDF_IMPL *impl);
163 int (*ctrl) (EVP_KDF_IMPL *impl, int cmd, va_list args);
164 int (*ctrl_str) (EVP_KDF_IMPL *impl, const char *type, const char *value);
165 size_t (*size) (EVP_KDF_IMPL *impl);
166 int (*derive) (EVP_KDF_IMPL *impl, unsigned char *key, size_t keylen);
169 extern const EVP_KDF pbkdf2_kdf_meth;
170 extern const EVP_KDF scrypt_kdf_meth;
171 extern const EVP_KDF tls1_prf_kdf_meth;
172 extern const EVP_KDF hkdf_kdf_meth;
173 extern const EVP_KDF sshkdf_kdf_meth;
174 extern const EVP_KDF ss_kdf_meth;
175 extern const EVP_KDF x963_kdf_meth;
176 extern const EVP_KDF x942_kdf_meth;
182 /* Legacy structure members */
183 /* TODO(3.0): Remove these */
187 int (*init) (EVP_MD_CTX *ctx);
188 int (*update) (EVP_MD_CTX *ctx, const void *data, size_t count);
189 int (*final) (EVP_MD_CTX *ctx, unsigned char *md);
190 int (*copy) (EVP_MD_CTX *to, const EVP_MD_CTX *from);
191 int (*cleanup) (EVP_MD_CTX *ctx);
193 int ctx_size; /* how big does the ctx->md_data need to be */
194 /* control function */
195 int (*md_ctrl) (EVP_MD_CTX *ctx, int cmd, int p1, void *p2);
197 /* New structure members */
198 /* TODO(3.0): Remove above comment when legacy has gone */
200 CRYPTO_REF_COUNT refcnt;
202 OSSL_OP_digest_newctx_fn *newctx;
203 OSSL_OP_digest_init_fn *dinit;
204 OSSL_OP_digest_update_fn *dupdate;
205 OSSL_OP_digest_final_fn *dfinal;
206 OSSL_OP_digest_digest_fn *digest;
207 OSSL_OP_digest_freectx_fn *freectx;
208 OSSL_OP_digest_dupctx_fn *dupctx;
209 OSSL_OP_digest_size_fn *size;
210 OSSL_OP_digest_block_size_fn *dblock_size;
211 OSSL_OP_digest_set_params_fn *set_params;
212 OSSL_OP_digest_get_params_fn *get_params;
216 struct evp_cipher_st {
220 /* Default value for variable length ciphers */
224 /* Legacy structure members */
225 /* TODO(3.0): Remove these */
229 int (*init) (EVP_CIPHER_CTX *ctx, const unsigned char *key,
230 const unsigned char *iv, int enc);
231 /* encrypt/decrypt data */
232 int (*do_cipher) (EVP_CIPHER_CTX *ctx, unsigned char *out,
233 const unsigned char *in, size_t inl);
235 int (*cleanup) (EVP_CIPHER_CTX *);
236 /* how big ctx->cipher_data needs to be */
238 /* Populate a ASN1_TYPE with parameters */
239 int (*set_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
240 /* Get parameters from a ASN1_TYPE */
241 int (*get_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
242 /* Miscellaneous operations */
243 int (*ctrl) (EVP_CIPHER_CTX *, int type, int arg, void *ptr);
244 /* Application data */
247 /* New structure members */
248 /* TODO(3.0): Remove above comment when legacy has gone */
250 CRYPTO_REF_COUNT refcnt;
252 OSSL_OP_cipher_newctx_fn *newctx;
253 OSSL_OP_cipher_encrypt_init_fn *einit;
254 OSSL_OP_cipher_decrypt_init_fn *dinit;
255 OSSL_OP_cipher_update_fn *cupdate;
256 OSSL_OP_cipher_final_fn *cfinal;
257 OSSL_OP_cipher_cipher_fn *ccipher;
258 OSSL_OP_cipher_freectx_fn *freectx;
259 OSSL_OP_cipher_dupctx_fn *dupctx;
260 OSSL_OP_cipher_get_params_fn *get_params;
261 OSSL_OP_cipher_ctx_get_params_fn *ctx_get_params;
262 OSSL_OP_cipher_ctx_set_params_fn *ctx_set_params;
265 /* Macros to code block cipher wrappers */
267 /* Wrapper functions for each cipher mode */
269 #define EVP_C_DATA(kstruct, ctx) \
270 ((kstruct *)EVP_CIPHER_CTX_get_cipher_data(ctx))
272 #define BLOCK_CIPHER_ecb_loop() \
274 bl = EVP_CIPHER_CTX_cipher(ctx)->block_size; \
275 if (inl < bl) return 1;\
277 for (i=0; i <= inl; i+=bl)
279 #define BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
280 static int cname##_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
282 BLOCK_CIPHER_ecb_loop() \
283 cprefix##_ecb_encrypt(in + i, out + i, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_encrypting(ctx)); \
287 #define EVP_MAXCHUNK ((size_t)1<<(sizeof(long)*8-2))
289 #define BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched) \
290 static int cname##_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
292 while(inl>=EVP_MAXCHUNK) {\
293 int num = EVP_CIPHER_CTX_num(ctx);\
294 cprefix##_ofb##cbits##_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
295 EVP_CIPHER_CTX_set_num(ctx, num);\
301 int num = EVP_CIPHER_CTX_num(ctx);\
302 cprefix##_ofb##cbits##_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
303 EVP_CIPHER_CTX_set_num(ctx, num);\
308 #define BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
309 static int cname##_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
311 while(inl>=EVP_MAXCHUNK) \
313 cprefix##_cbc_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
319 cprefix##_cbc_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
323 #define BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched) \
324 static int cname##_cfb##cbits##_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
326 size_t chunk = EVP_MAXCHUNK;\
327 if (cbits == 1) chunk >>= 3;\
328 if (inl < chunk) chunk = inl;\
329 while (inl && inl >= chunk)\
331 int num = EVP_CIPHER_CTX_num(ctx);\
332 cprefix##_cfb##cbits##_encrypt(in, out, (long) \
334 && !EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS) \
335 ? chunk*8 : chunk), \
336 &EVP_C_DATA(kstruct, ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx),\
337 &num, EVP_CIPHER_CTX_encrypting(ctx));\
338 EVP_CIPHER_CTX_set_num(ctx, num);\
342 if (inl < chunk) chunk = inl;\
347 #define BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
348 BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
349 BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched) \
350 BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
351 BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched)
353 #define BLOCK_CIPHER_def1(cname, nmode, mode, MODE, kstruct, nid, block_size, \
354 key_len, iv_len, flags, init_key, cleanup, \
355 set_asn1, get_asn1, ctrl) \
356 static const EVP_CIPHER cname##_##mode = { \
357 nid##_##nmode, block_size, key_len, iv_len, \
358 flags | EVP_CIPH_##MODE##_MODE, \
360 cname##_##mode##_cipher, \
367 const EVP_CIPHER *EVP_##cname##_##mode(void) { return &cname##_##mode; }
369 #define BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, \
370 iv_len, flags, init_key, cleanup, set_asn1, \
372 BLOCK_CIPHER_def1(cname, cbc, cbc, CBC, kstruct, nid, block_size, key_len, \
373 iv_len, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
375 #define BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, \
376 iv_len, cbits, flags, init_key, cleanup, \
377 set_asn1, get_asn1, ctrl) \
378 BLOCK_CIPHER_def1(cname, cfb##cbits, cfb##cbits, CFB, kstruct, nid, 1, \
379 key_len, iv_len, flags, init_key, cleanup, set_asn1, \
382 #define BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, \
383 iv_len, cbits, flags, init_key, cleanup, \
384 set_asn1, get_asn1, ctrl) \
385 BLOCK_CIPHER_def1(cname, ofb##cbits, ofb, OFB, kstruct, nid, 1, \
386 key_len, iv_len, flags, init_key, cleanup, set_asn1, \
389 #define BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, \
390 flags, init_key, cleanup, set_asn1, \
392 BLOCK_CIPHER_def1(cname, ecb, ecb, ECB, kstruct, nid, block_size, key_len, \
393 0, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
395 #define BLOCK_CIPHER_defs(cname, kstruct, \
396 nid, block_size, key_len, iv_len, cbits, flags, \
397 init_key, cleanup, set_asn1, get_asn1, ctrl) \
398 BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, iv_len, flags, \
399 init_key, cleanup, set_asn1, get_asn1, ctrl) \
400 BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, iv_len, cbits, \
401 flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
402 BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, iv_len, cbits, \
403 flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
404 BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, flags, \
405 init_key, cleanup, set_asn1, get_asn1, ctrl)
408 #define BLOCK_CIPHER_defs(cname, kstruct, \
409 nid, block_size, key_len, iv_len, flags,\
410 init_key, cleanup, set_asn1, get_asn1, ctrl)\
411 static const EVP_CIPHER cname##_cbc = {\
412 nid##_cbc, block_size, key_len, iv_len, \
413 flags | EVP_CIPH_CBC_MODE,\
417 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
418 sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
423 const EVP_CIPHER *EVP_##cname##_cbc(void) { return &cname##_cbc; }\
424 static const EVP_CIPHER cname##_cfb = {\
425 nid##_cfb64, 1, key_len, iv_len, \
426 flags | EVP_CIPH_CFB_MODE,\
430 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
431 sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
436 const EVP_CIPHER *EVP_##cname##_cfb(void) { return &cname##_cfb; }\
437 static const EVP_CIPHER cname##_ofb = {\
438 nid##_ofb64, 1, key_len, iv_len, \
439 flags | EVP_CIPH_OFB_MODE,\
443 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
444 sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
449 const EVP_CIPHER *EVP_##cname##_ofb(void) { return &cname##_ofb; }\
450 static const EVP_CIPHER cname##_ecb = {\
451 nid##_ecb, block_size, key_len, iv_len, \
452 flags | EVP_CIPH_ECB_MODE,\
456 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
457 sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
462 const EVP_CIPHER *EVP_##cname##_ecb(void) { return &cname##_ecb; }
465 #define IMPLEMENT_BLOCK_CIPHER(cname, ksched, cprefix, kstruct, nid, \
466 block_size, key_len, iv_len, cbits, \
468 cleanup, set_asn1, get_asn1, ctrl) \
469 BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
470 BLOCK_CIPHER_defs(cname, kstruct, nid, block_size, key_len, iv_len, \
471 cbits, flags, init_key, cleanup, set_asn1, \
474 #define IMPLEMENT_CFBR(cipher,cprefix,kstruct,ksched,keysize,cbits,iv_len,fl) \
475 BLOCK_CIPHER_func_cfb(cipher##_##keysize,cprefix,cbits,kstruct,ksched) \
476 BLOCK_CIPHER_def_cfb(cipher##_##keysize,kstruct, \
477 NID_##cipher##_##keysize, keysize/8, iv_len, cbits, \
478 (fl)|EVP_CIPH_FLAG_DEFAULT_ASN1, \
479 cipher##_init_key, NULL, NULL, NULL, NULL)
482 # ifndef OPENSSL_NO_EC
484 #define X25519_KEYLEN 32
485 #define X448_KEYLEN 56
486 #define ED448_KEYLEN 57
488 #define MAX_KEYLEN ED448_KEYLEN
491 unsigned char pubkey[MAX_KEYLEN];
492 unsigned char *privkey;
498 * Type needs to be a bit field Sub-type needs to be for variations on the
499 * method, as in, can it do arbitrary encryption....
504 CRYPTO_REF_COUNT references;
505 const EVP_PKEY_ASN1_METHOD *ameth;
507 ENGINE *pmeth_engine; /* If not NULL public key ENGINE to use */
510 # ifndef OPENSSL_NO_RSA
511 struct rsa_st *rsa; /* RSA */
513 # ifndef OPENSSL_NO_DSA
514 struct dsa_st *dsa; /* DSA */
516 # ifndef OPENSSL_NO_DH
517 struct dh_st *dh; /* DH */
519 # ifndef OPENSSL_NO_EC
520 struct ec_key_st *ec; /* ECC */
521 ECX_KEY *ecx; /* X25519, X448, Ed25519, Ed448 */
525 STACK_OF(X509_ATTRIBUTE) *attributes; /* [ 0 ] */
530 void openssl_add_all_ciphers_int(void);
531 void openssl_add_all_digests_int(void);
532 void openssl_add_all_macs_int(void);
533 void openssl_add_all_kdfs_int(void);
534 void evp_cleanup_int(void);
535 void evp_app_cleanup_int(void);
537 /* Pulling defines out of C source files */
539 #define EVP_RC4_KEY_SIZE 16
540 #ifndef TLS1_1_VERSION
541 # define TLS1_1_VERSION 0x0302
544 void evp_encode_ctx_set_flags(EVP_ENCODE_CTX *ctx, unsigned int flags);
546 /* EVP_ENCODE_CTX flags */
547 /* Don't generate new lines when encoding */
548 #define EVP_ENCODE_CTX_NO_NEWLINES 1
549 /* Use the SRP base64 alphabet instead of the standard one */
550 #define EVP_ENCODE_CTX_USE_SRP_ALPHABET 2