Update CSRP-GMP to commit deaa11a7c29a73008

Backports 10 commits, with 8 commits
actually affecting source code:

https://github.com/est31/csrp-gmp/compare/695822e45d9ca48b75b4ec1af1b4eea19139f8b1...deaa11a7c29a730087380da231e785909ad21630

1 files changed, 279 insertions, 326 deletions

diff --git a/src/util/srp.cpp b/src/util/srp.cpp
index e3812ee54..0d3c938a3 100644
--- a/src/util/srp.cpp
+++ b/src/util/srp.cpp
@@ -26,12 +26,14 @@
  *
  */
 
+// clang-format off
 #ifdef WIN32
 	#include <windows.h>
 	#include <wincrypt.h>
 #else
 	#include <time.h>
 #endif
+// clang-format on
 
 #include <stdlib.h>
 #include <string.h>
@@ -69,116 +71,116 @@ static int g_initialized = 0;
 static unsigned int g_rand_idx;
 static unsigned char g_rand_buff[RAND_BUFF_MAX];
 
-void *(*srp_alloc) (size_t) = &malloc;
-void *(*srp_realloc) (void *, size_t) = &realloc;
-void (*srp_free) (void *) = &free;
+void *(*srp_alloc)(size_t) = &malloc;
+void *(*srp_realloc)(void *, size_t) = &realloc;
+void (*srp_free)(void *) = &free;
 
+// clang-format off
 void srp_set_memory_functions(
-		void *(*new_srp_alloc) (size_t),
-		void *(*new_srp_realloc) (void *, size_t),
-		void (*new_srp_free) (void *)) {
+		void *(*new_srp_alloc)(size_t),
+		void *(*new_srp_realloc)(void *, size_t),
+		void (*new_srp_free)(void *))
+{
 	srp_alloc = new_srp_alloc;
 	srp_realloc = new_srp_realloc;
 	srp_free = new_srp_free;
 }
+// clang-format on
 
-typedef struct
-{
+typedef struct {
 	mpz_t N;
 	mpz_t g;
 } NGConstant;
 
-struct NGHex
-{
-	const char* n_hex;
-	const char* g_hex;
+struct NGHex {
+	const char *n_hex;
+	const char *g_hex;
 };
 
 /* All constants here were pulled from Appendix A of RFC 5054 */
 static struct NGHex global_Ng_constants[] = {
-	{ /* 1024 */
-	"EEAF0AB9ADB38DD69C33F80AFA8FC5E86072618775FF3C0B9EA2314C9C256576D674DF7496"
-	"EA81D3383B4813D692C6E0E0D5D8E250B98BE48E495C1D6089DAD15DC7D7B46154D6B6CE8E"
-	"F4AD69B15D4982559B297BCF1885C529F566660E57EC68EDBC3C05726CC02FD4CBF4976EAA"
-	"9AFD5138FE8376435B9FC61D2FC0EB06E3",
-	"2"
-	},
-	{ /* 2048 */
-	"AC6BDB41324A9A9BF166DE5E1389582FAF72B6651987EE07FC3192943DB56050A37329CBB4"
-	"A099ED8193E0757767A13DD52312AB4B03310DCD7F48A9DA04FD50E8083969EDB767B0CF60"
-	"95179A163AB3661A05FBD5FAAAE82918A9962F0B93B855F97993EC975EEAA80D740ADBF4FF"
-	"747359D041D5C33EA71D281E446B14773BCA97B43A23FB801676BD207A436C6481F1D2B907"
-	"8717461A5B9D32E688F87748544523B524B0D57D5EA77A2775D2ECFA032CFBDBF52FB37861"
-	"60279004E57AE6AF874E7303CE53299CCC041C7BC308D82A5698F3A8D0C38271AE35F8E9DB"
-	"FBB694B5C803D89F7AE435DE236D525F54759B65E372FCD68EF20FA7111F9E4AFF73",
-	"2"
-	},
-	{ /* 4096 */
-	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
-	"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
-	"302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
-	"A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
-	"49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
-	"FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
-	"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
-	"180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
-	"3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
-	"04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
-	"B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
-	"1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
-	"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
-	"E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
-	"99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
-	"04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
-	"233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
-	"D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199"
-	"FFFFFFFFFFFFFFFF",
-	"5"
-	},
-	{ /* 8192 */
-	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
-	"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
-	"302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
-	"A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
-	"49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
-	"FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
-	"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
-	"180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
-	"3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
-	"04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
-	"B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
-	"1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
-	"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
-	"E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
-	"99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
-	"04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
-	"233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
-	"D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492"
-	"36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BDF8FF9406"
-	"AD9E530EE5DB382F413001AEB06A53ED9027D831179727B0865A8918"
-	"DA3EDBEBCF9B14ED44CE6CBACED4BB1BDB7F1447E6CC254B33205151"
-	"2BD7AF426FB8F401378CD2BF5983CA01C64B92ECF032EA15D1721D03"
-	"F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E59E7C97F"
-	"BEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA"
-	"CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58B"
-	"B7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632"
-	"387FE8D76E3C0468043E8F663F4860EE12BF2D5B0B7474D6E694F91E"
-	"6DBE115974A3926F12FEE5E438777CB6A932DF8CD8BEC4D073B931BA"
-	"3BC832B68D9DD300741FA7BF8AFC47ED2576F6936BA424663AAB639C"
-	"5AE4F5683423B4742BF1C978238F16CBE39D652DE3FDB8BEFC848AD9"
-	"22222E04A4037C0713EB57A81A23F0C73473FC646CEA306B4BCBC886"
-	"2F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A6"
-	"6D2A13F83F44F82DDF310EE074AB6A364597E899A0255DC164F31CC5"
-	"0846851DF9AB48195DED7EA1B1D510BD7EE74D73FAF36BC31ECFA268"
-	"359046F4EB879F924009438B481C6CD7889A002ED5EE382BC9190DA6"
-	"FC026E479558E4475677E9AA9E3050E2765694DFC81F56E880B96E71"
-	"60C980DD98EDD3DFFFFFFFFFFFFFFFFF",
-	"13"
-	},
-	{0,0} /* null sentinel */
+	{/* 1024 */
+		"EEAF0AB9ADB38DD69C33F80AFA8FC5E86072618775FF3C0B9EA2314C"
+		"9C256576D674DF7496EA81D3383B4813D692C6E0E0D5D8E250B98BE4"
+		"8E495C1D6089DAD15DC7D7B46154D6B6CE8EF4AD69B15D4982559B29"
+		"7BCF1885C529F566660E57EC68EDBC3C05726CC02FD4CBF4976EAA9A"
+		"FD5138FE8376435B9FC61D2FC0EB06E3",
+		"2"},
+	{/* 2048 */
+		"AC6BDB41324A9A9BF166DE5E1389582FAF72B6651987EE07FC319294"
+		"3DB56050A37329CBB4A099ED8193E0757767A13DD52312AB4B03310D"
+		"CD7F48A9DA04FD50E8083969EDB767B0CF6095179A163AB3661A05FB"
+		"D5FAAAE82918A9962F0B93B855F97993EC975EEAA80D740ADBF4FF74"
+		"7359D041D5C33EA71D281E446B14773BCA97B43A23FB801676BD207A"
+		"436C6481F1D2B9078717461A5B9D32E688F87748544523B524B0D57D"
+		"5EA77A2775D2ECFA032CFBDBF52FB3786160279004E57AE6AF874E73"
+		"03CE53299CCC041C7BC308D82A5698F3A8D0C38271AE35F8E9DBFBB6"
+		"94B5C803D89F7AE435DE236D525F54759B65E372FCD68EF20FA7111F"
+		"9E4AFF73",
+		"2"},
+	{/* 4096 */
+		"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
+		"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
+		"302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
+		"A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
+		"49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
+		"FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
+		"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
+		"180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
+		"3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
+		"04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
+		"B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
+		"1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
+		"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
+		"E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
+		"99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
+		"04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
+		"233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
+		"D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199"
+		"FFFFFFFFFFFFFFFF",
+		"5"},
+	{/* 8192 */
+		"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
+		"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
+		"302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
+		"A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
+		"49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
+		"FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
+		"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
+		"180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
+		"3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
+		"04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
+		"B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
+		"1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
+		"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
+		"E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
+		"99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
+		"04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
+		"233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
+		"D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492"
+		"36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BDF8FF9406"
+		"AD9E530EE5DB382F413001AEB06A53ED9027D831179727B0865A8918"
+		"DA3EDBEBCF9B14ED44CE6CBACED4BB1BDB7F1447E6CC254B33205151"
+		"2BD7AF426FB8F401378CD2BF5983CA01C64B92ECF032EA15D1721D03"
+		"F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E59E7C97F"
+		"BEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA"
+		"CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58B"
+		"B7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632"
+		"387FE8D76E3C0468043E8F663F4860EE12BF2D5B0B7474D6E694F91E"
+		"6DBE115974A3926F12FEE5E438777CB6A932DF8CD8BEC4D073B931BA"
+		"3BC832B68D9DD300741FA7BF8AFC47ED2576F6936BA424663AAB639C"
+		"5AE4F5683423B4742BF1C978238F16CBE39D652DE3FDB8BEFC848AD9"
+		"22222E04A4037C0713EB57A81A23F0C73473FC646CEA306B4BCBC886"
+		"2F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A6"
+		"6D2A13F83F44F82DDF310EE074AB6A364597E899A0255DC164F31CC5"
+		"0846851DF9AB48195DED7EA1B1D510BD7EE74D73FAF36BC31ECFA268"
+		"359046F4EB879F924009438B481C6CD7889A002ED5EE382BC9190DA6"
+		"FC026E479558E4475677E9AA9E3050E2765694DFC81F56E880B96E71"
+		"60C980DD98EDD3DFFFFFFFFFFFFFFFFF",
+		"13"},
+	{0, 0} /* null sentinel */
 };
 
-
 static void delete_ng(NGConstant *ng)
 {
 	if (ng) {
@@ -188,18 +190,18 @@ static void delete_ng(NGConstant *ng)
 	}
 }
 
-static NGConstant *new_ng( SRP_NGType ng_type, const char *n_hex, const char *g_hex )
+static NGConstant *new_ng(SRP_NGType ng_type, const char *n_hex, const char *g_hex)
 {
-	NGConstant *ng = (NGConstant *) srp_alloc(sizeof(NGConstant));
+	NGConstant *ng = (NGConstant *)srp_alloc(sizeof(NGConstant));
+
+	if (!ng) return 0;
+
 	mpz_init(ng->N);
 	mpz_init(ng->g);
 
-	if (!ng)
-		return 0;
-
 	if (ng_type != SRP_NG_CUSTOM) {
-		n_hex = global_Ng_constants[ ng_type ].n_hex;
-		g_hex = global_Ng_constants[ ng_type ].g_hex;
+		n_hex = global_Ng_constants[ng_type].n_hex;
+		g_hex = global_Ng_constants[ng_type].g_hex;
 	}
 
 	int rv = 0;
@@ -214,17 +216,13 @@ static NGConstant *new_ng( SRP_NGType ng_type, const char *n_hex, const char *g_
 	return ng;
 }
 
-
-typedef union
-{
-	SHA_CTX    sha;
+typedef union {
+	SHA_CTX sha;
 	SHA256_CTX sha256;
-	//SHA512_CTX sha512;
+	// SHA512_CTX sha512;
 } HashCTX;
 
-
-struct SRPVerifier
-{
+struct SRPVerifier {
 	SRP_HashAlgorithm hash_alg;
 	NGConstant *ng;
 
@@ -237,9 +235,7 @@ struct SRPVerifier
 	unsigned char session_key[SHA512_DIGEST_LENGTH];
 };
 
-
-struct SRPUser
-{
+struct SRPUser {
 	SRP_HashAlgorithm hash_alg;
 	NGConstant *ng;
 
@@ -260,19 +256,23 @@ struct SRPUser
 	unsigned char session_key[SHA512_DIGEST_LENGTH];
 };
 
-
+// clang-format off
 static int hash_init(SRP_HashAlgorithm alg, HashCTX *c)
 {
 	switch (alg) {
 #ifdef CSRP_USE_SHA1
 		case SRP_SHA1: return SHA1_Init(&c->sha);
 #endif
-		/*case SRP_SHA224: return SHA224_Init(&c->sha256);*/
+		/*
+		case SRP_SHA224: return SHA224_Init(&c->sha256);
+		*/
 #ifdef CSRP_USE_SHA256
 		case SRP_SHA256: return SHA256_Init(&c->sha256);
 #endif
-		/*case SRP_SHA384: return SHA384_Init(&c->sha512);
-		case SRP_SHA512: return SHA512_Init(&c->sha512);*/
+		/*
+		case SRP_SHA384: return SHA384_Init(&c->sha512);
+		case SRP_SHA512: return SHA512_Init(&c->sha512);
+		*/
 		default: return -1;
 	};
 }
@@ -282,12 +282,16 @@ static int hash_update( SRP_HashAlgorithm alg, HashCTX *c, const void *data, siz
 #ifdef CSRP_USE_SHA1
 		case SRP_SHA1: return SHA1_Update(&c->sha, data, len);
 #endif
-		/*case SRP_SHA224: return SHA224_Update(&c->sha256, data, len);*/
+		/*
+		case SRP_SHA224: return SHA224_Update(&c->sha256, data, len);
+		*/
 #ifdef CSRP_USE_SHA256
 		case SRP_SHA256: return SHA256_Update(&c->sha256, data, len);
 #endif
-		/*case SRP_SHA384: return SHA384_Update( &c->sha512, data, len );
-		case SRP_SHA512: return SHA512_Update( &c->sha512, data, len );*/
+		/*
+		case SRP_SHA384: return SHA384_Update(&c->sha512, data, len);
+		case SRP_SHA512: return SHA512_Update(&c->sha512, data, len);
+		*/
 		default: return -1;
 	};
 }
@@ -297,12 +301,16 @@ static int hash_final( SRP_HashAlgorithm alg, HashCTX *c, unsigned char *md )
 #ifdef CSRP_USE_SHA1
 		case SRP_SHA1: return SHA1_Final(md, &c->sha);
 #endif
-		/*case SRP_SHA224: return SHA224_Final(md, &c->sha256);*/
+		/*
+		case SRP_SHA224: return SHA224_Final(md, &c->sha256);
+		*/
 #ifdef CSRP_USE_SHA256
 		case SRP_SHA256: return SHA256_Final(md, &c->sha256);
 #endif
-		/*case SRP_SHA384: return SHA384_Final(md, &c->sha512);
-		case SRP_SHA512: return SHA512_Final(md, &c->sha512);*/
+		/*
+		case SRP_SHA384: return SHA384_Final(md, &c->sha512);
+		case SRP_SHA512: return SHA512_Final(md, &c->sha512);
+		*/
 		default: return -1;
 	};
 }
@@ -312,12 +320,16 @@ static unsigned char *hash(SRP_HashAlgorithm alg, const unsigned char *d, size_t
 #ifdef CSRP_USE_SHA1
 		case SRP_SHA1: return SHA1(d, n, md);
 #endif
-		/*case SRP_SHA224: return SHA224( d, n, md );*/
+		/*
+		case SRP_SHA224: return SHA224( d, n, md );
+		*/
 #ifdef CSRP_USE_SHA256
 		case SRP_SHA256: return SHA256(d, n, md);
 #endif
-		/*case SRP_SHA384: return SHA384( d, n, md );
-		case SRP_SHA512: return SHA512( d, n, md );*/
+		/*
+		case SRP_SHA384: return SHA384( d, n, md );
+		case SRP_SHA512: return SHA512( d, n, md );
+		*/
 		default: return 0;
 	};
 }
@@ -327,19 +339,24 @@ static size_t hash_length(SRP_HashAlgorithm alg)
 #ifdef CSRP_USE_SHA1
 		case SRP_SHA1: return SHA_DIGEST_LENGTH;
 #endif
-		/*case SRP_SHA224: return SHA224_DIGEST_LENGTH;*/
+		/*
+		case SRP_SHA224: return SHA224_DIGEST_LENGTH;
+		*/
 #ifdef CSRP_USE_SHA256
 		case SRP_SHA256: return SHA256_DIGEST_LENGTH;
 #endif
-		/*case SRP_SHA384: return SHA384_DIGEST_LENGTH;
-		case SRP_SHA512: return SHA512_DIGEST_LENGTH;*/
+		/*
+		case SRP_SHA384: return SHA384_DIGEST_LENGTH;
+		case SRP_SHA512: return SHA512_DIGEST_LENGTH;
+		*/
 		default: return -1;
 	};
 }
+// clang-format on
 
 inline static int mpz_num_bytes(const mpz_t op)
 {
-	return (mpz_sizeinbase (op, 2) + 7) / 8;
+	return (mpz_sizeinbase(op, 2) + 7) / 8;
 }
 
 inline static void mpz_to_bin(const mpz_t op, unsigned char *to)
@@ -353,72 +370,77 @@ inline static void mpz_from_bin(const unsigned char *s, size_t len, mpz_t ret)
 }
 
 // set op to (op1 * op2) mod d, using tmp for the calculation
-inline static void mpz_mulm(mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp)
+inline static void mpz_mulm(
+	mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp)
 {
 	mpz_mul(tmp, op1, op2);
 	mpz_mod(op, tmp, d);
 }
 
 // set op to (op1 + op2) mod d, using tmp for the calculation
-inline static void mpz_addm( mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp )
+inline static void mpz_addm(
+	mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp)
 {
 	mpz_add(tmp, op1, op2);
 	mpz_mod(op, tmp, d);
 }
 
 // set op to (op1 - op2) mod d, using tmp for the calculation
-inline static void mpz_subm(mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp)
+inline static void mpz_subm(
+	mpz_t op, const mpz_t op1, const mpz_t op2, const mpz_t d, mpz_t tmp)
 {
 	mpz_sub(tmp, op1, op2);
 	mpz_mod(op, tmp, d);
 }
 
-static int H_nn(mpz_t result, SRP_HashAlgorithm alg, const mpz_t N, const mpz_t n1, const mpz_t n2)
+static SRP_Result H_nn(
+	mpz_t result, SRP_HashAlgorithm alg, const mpz_t N, const mpz_t n1, const mpz_t n2)
 {
 	unsigned char buff[SHA512_DIGEST_LENGTH];
 	size_t len_N = mpz_num_bytes(N);
 	size_t len_n1 = mpz_num_bytes(n1);
 	size_t len_n2 = mpz_num_bytes(n2);
 	size_t nbytes = len_N + len_N;
-	unsigned char *bin = (unsigned char *) srp_alloc(nbytes);
-	if (!bin)
-		return 0;
+	unsigned char *bin = (unsigned char *)srp_alloc(nbytes);
+	if (!bin) return SRP_ERR;
 	if (len_n1 > len_N || len_n2 > len_N) {
 		srp_free(bin);
-		return 0;
+		return SRP_ERR;
 	}
 	memset(bin, 0, nbytes);
 	mpz_to_bin(n1, bin + (len_N - len_n1));
 	mpz_to_bin(n2, bin + (len_N + len_N - len_n2));
-	hash( alg, bin, nbytes, buff );
+	hash(alg, bin, nbytes, buff);
 	srp_free(bin);
 	mpz_from_bin(buff, hash_length(alg), result);
-	return 1;
+	return SRP_OK;
 }
 
-static int H_ns(mpz_t result, SRP_HashAlgorithm alg, const unsigned char *n, size_t len_n, const unsigned char *bytes, size_t len_bytes)
+static SRP_Result H_ns(mpz_t result, SRP_HashAlgorithm alg, const unsigned char *n,
+	size_t len_n, const unsigned char *bytes, size_t len_bytes)
 {
 	unsigned char buff[SHA512_DIGEST_LENGTH];
 	size_t nbytes = len_n + len_bytes;
-	unsigned char *bin = (unsigned char *) srp_alloc(nbytes);
-	if (!bin)
-		return 0;
+	unsigned char *bin = (unsigned char *)srp_alloc(nbytes);
+	if (!bin) return SRP_ERR;
 	memcpy(bin, n, len_n);
 	memcpy(bin + len_n, bytes, len_bytes);
 	hash(alg, bin, nbytes, buff);
 	srp_free(bin);
 	mpz_from_bin(buff, hash_length(alg), result);
-	return 1;
+	return SRP_OK;
 }
 
-static int calculate_x(mpz_t result, SRP_HashAlgorithm alg, const unsigned char *salt, size_t salt_len, const char *username, const unsigned char *password, size_t password_len)
+static int calculate_x(mpz_t result, SRP_HashAlgorithm alg, const unsigned char *salt,
+	size_t salt_len, const char *username, const unsigned char *password,
+	size_t password_len)
 {
 	unsigned char ucp_hash[SHA512_DIGEST_LENGTH];
 	HashCTX ctx;
 	hash_init(alg, &ctx);
 
-	srp_dbg_data((char*) username, strlen(username), "Username for x: ");
-	srp_dbg_data((char*) password, password_len, "Password for x: ");
+	srp_dbg_data((char *)username, strlen(username), "Username for x: ");
+	srp_dbg_data((char *)password, password_len, "Password for x: ");
 	hash_update(alg, &ctx, username, strlen(username));
 	hash_update(alg, &ctx, ":", 1);
 	hash_update(alg, &ctx, password, password_len);
@@ -428,31 +450,31 @@ static int calculate_x(mpz_t result, SRP_HashAlgorithm alg, const unsigned char
 	return H_ns(result, alg, salt, salt_len, ucp_hash, hash_length(alg));
 }
 
-static void update_hash_n(SRP_HashAlgorithm alg, HashCTX *ctx, const mpz_t n)
+static SRP_Result update_hash_n(SRP_HashAlgorithm alg, HashCTX *ctx, const mpz_t n)
 {
 	size_t len = mpz_num_bytes(n);
-	unsigned char* n_bytes = (unsigned char *) srp_alloc(len);
-	if (!n_bytes)
-		return;
+	unsigned char *n_bytes = (unsigned char *)srp_alloc(len);
+	if (!n_bytes) return SRP_ERR;
 	mpz_to_bin(n, n_bytes);
 	hash_update(alg, ctx, n_bytes, len);
 	srp_free(n_bytes);
+	return SRP_OK;
 }
 
-static void hash_num( SRP_HashAlgorithm alg, const mpz_t n, unsigned char *dest )
+static SRP_Result hash_num(SRP_HashAlgorithm alg, const mpz_t n, unsigned char *dest)
 {
 	int nbytes = mpz_num_bytes(n);
-	unsigned char *bin = (unsigned char *) srp_alloc(nbytes);
-	if(!bin)
-		return;
+	unsigned char *bin = (unsigned char *)srp_alloc(nbytes);
+	if (!bin) return SRP_ERR;
 	mpz_to_bin(n, bin);
 	hash(alg, bin, nbytes, dest);
 	srp_free(bin);
+	return SRP_OK;
 }
 
-static void calculate_M(SRP_HashAlgorithm alg, NGConstant *ng, unsigned char *dest,
-	const char *I, const unsigned char *s_bytes, size_t s_len,
-	const mpz_t A, const mpz_t B, const unsigned char *K)
+static SRP_Result calculate_M(SRP_HashAlgorithm alg, NGConstant *ng, unsigned char *dest,
+	const char *I, const unsigned char *s_bytes, size_t s_len, const mpz_t A,
+	const mpz_t B, const unsigned char *K)
 {
 	unsigned char H_N[SHA512_DIGEST_LENGTH];
 	unsigned char H_g[SHA512_DIGEST_LENGTH];
@@ -462,13 +484,12 @@ static void calculate_M(SRP_HashAlgorithm alg, NGConstant *ng, unsigned char *de
 	size_t i = 0;
 	size_t hash_len = hash_length(alg);
 
-	hash_num(alg, ng->N, H_N);
-	hash_num(alg, ng->g, H_g);
+	if (!hash_num(alg, ng->N, H_N)) return SRP_ERR;
+	if (!hash_num(alg, ng->g, H_g)) return SRP_ERR;
 
 	hash(alg, (const unsigned char *)I, strlen(I), H_I);
 
-
-	for (i = 0; i < hash_len; i++ )
+	for (i = 0; i < hash_len; i++)
 		H_xor[i] = H_N[i] ^ H_g[i];
 
 	hash_init(alg, &ctx);
@@ -476,54 +497,29 @@ static void calculate_M(SRP_HashAlgorithm alg, NGConstant *ng, unsigned char *de
 	hash_update(alg, &ctx, H_xor, hash_len);
 	hash_update(alg, &ctx, H_I, hash_len);
 	hash_update(alg, &ctx, s_bytes, s_len);
-	update_hash_n(alg, &ctx, A);
-	update_hash_n(alg, &ctx, B);
+	if (!update_hash_n(alg, &ctx, A)) return SRP_ERR;
+	if (!update_hash_n(alg, &ctx, B)) return SRP_ERR;
 	hash_update(alg, &ctx, K, hash_len);
 
 	hash_final(alg, &ctx, dest);
+	return SRP_OK;
 }
 
-static void calculate_H_AMK(SRP_HashAlgorithm alg, unsigned char *dest, const mpz_t A, const unsigned char *M, const unsigned char *K)
+static SRP_Result calculate_H_AMK(SRP_HashAlgorithm alg, unsigned char *dest,
+	const mpz_t A, const unsigned char *M, const unsigned char *K)
 {
 	HashCTX ctx;
 
 	hash_init(alg, &ctx);
 
-	update_hash_n(alg, &ctx, A);
+	if (!update_hash_n(alg, &ctx, A)) return SRP_ERR;
 	hash_update(alg, &ctx, M, hash_length(alg));
 	hash_update(alg, &ctx, K, hash_length(alg));
 
 	hash_final(alg, &ctx, dest);
+	return SRP_OK;
 }
 
-#ifndef WIN32
-
-struct srp_pcgrandom {
-	unsigned long long int m_state;
-	unsigned long long int m_inc;
-}; typedef struct srp_pcgrandom srp_pcgrandom;
-
-static unsigned long int srp_pcgrandom_next(srp_pcgrandom *r)
-{
-	unsigned long long int oldstate = r->m_state;
-	r->m_state = oldstate * 6364136223846793005ULL + r->m_inc;
-
-	unsigned long int xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
-	unsigned long int rot = oldstate >> 59u;
-	return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
-}
-
-static void srp_pcgrandom_seed(srp_pcgrandom *r, unsigned long long int state,
-	unsigned long long int  seq)
-{
-	r->m_state = 0U;
-	r->m_inc = (seq << 1u) | 1u;
-	srp_pcgrandom_next(r);
-	r->m_state += state;
-	srp_pcgrandom_next(r);
-}
-#endif
-
 static SRP_Result fill_buff()
 {
 	g_rand_idx = 0;
@@ -536,29 +532,18 @@ static SRP_Result fill_buff()
 
 #ifdef WIN32
 
-	CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
-	CryptGenRandom(wctx, sizeof(g_rand_buff), (BYTE*) g_rand_buff);
-	CryptReleaseContext(wctx, 0);
-
-	return SRP_OK;
+	if (!CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+		return SRP_ERR;
+	if (!CryptGenRandom(wctx, sizeof(g_rand_buff), (BYTE *)g_rand_buff)) return SRP_ERR;
+	if (!CryptReleaseContext(wctx, 0)) return SRP_ERR;
 
 #else
 	fp = fopen("/dev/urandom", "r");
 
-	if (fp) {
-		fread(g_rand_buff, sizeof(g_rand_buff), 1, fp);
-		fclose(fp);
-	} else {
-		srp_pcgrandom *r = (srp_pcgrandom *) srp_alloc(sizeof(srp_pcgrandom));
-		if (!r)
-			return SRP_ERR;
-		srp_pcgrandom_seed(r, time(NULL) ^ clock(), 0xda3e39cb94b95bdbULL);
-		size_t i = 0;
-		for (i = 0; i < RAND_BUFF_MAX; i++) {
-			g_rand_buff[i] = srp_pcgrandom_next(r);
-		}
-		srp_free(r);
-	}
+	if (!fp) return SRP_ERR;
+
+	if (fread(g_rand_buff, sizeof(g_rand_buff), 1, fp) != 1) return SRP_ERR;
+	if (fclose(fp)) return SRP_ERR;
 #endif
 	return SRP_OK;
 }
@@ -567,17 +552,15 @@ static SRP_Result mpz_fill_random(mpz_t num)
 {
 	// was call: BN_rand(num, 256, -1, 0);
 	if (RAND_BUFF_MAX - g_rand_idx < 32)
-		if (fill_buff() != SRP_OK)
-			return SRP_ERR;
-	mpz_from_bin((const unsigned char *) (&g_rand_buff[g_rand_idx]), 32, num);
+		if (fill_buff() != SRP_OK) return SRP_ERR;
+	mpz_from_bin((const unsigned char *)(&g_rand_buff[g_rand_idx]), 32, num);
 	g_rand_idx += 32;
 	return SRP_OK;
 }
 
 static SRP_Result init_random()
 {
-	if (g_initialized)
-		return SRP_OK;
+	if (g_initialized) return SRP_OK;
 	SRP_Result ret = fill_buff();
 	g_initialized = (ret == SRP_OK);
 	return ret;
@@ -600,6 +583,7 @@ static SRP_Result init_random()
  *
  ***********************************************************************************************************/
 
+// clang-format off
 SRP_Result srp_create_salted_verification_key( SRP_HashAlgorithm alg,
 	SRP_NGType ng_type, const char *username_for_verifier,
 	const unsigned char *password, size_t len_password,
@@ -611,10 +595,11 @@ SRP_Result srp_create_salted_verification_key( SRP_HashAlgorithm alg,
 
 	mpz_t v; mpz_init(v);
 	mpz_t x; mpz_init(x);
+	// clang-format on
+
 	NGConstant *ng = new_ng(ng_type, n_hex, g_hex);
 
-	if (!ng)
-		goto error_and_exit;
+	if (!ng) goto error_and_exit;
 
 	if (init_random() != SRP_OK) /* Only happens once */
 		goto error_and_exit;
@@ -623,18 +608,15 @@ SRP_Result srp_create_salted_verification_key( SRP_HashAlgorithm alg,
 		size_t size_to_fill = 16;
 		*len_s = size_to_fill;
 		if (RAND_BUFF_MAX - g_rand_idx < size_to_fill)
-			if (fill_buff() != SRP_OK)
-				goto error_and_exit;
-		*bytes_s = (unsigned char*)srp_alloc(size_to_fill);
-		if (!*bytes_s)
-			goto error_and_exit;
+			if (fill_buff() != SRP_OK) goto error_and_exit;
+		*bytes_s = (unsigned char *)srp_alloc(size_to_fill);
+		if (!*bytes_s) goto error_and_exit;
 		memcpy(*bytes_s, &g_rand_buff + g_rand_idx, size_to_fill);
 		g_rand_idx += size_to_fill;
 	}
 
-
-	if (!calculate_x(x, alg, *bytes_s, *len_s, username_for_verifier,
-			password, len_password))
+	if (!calculate_x(
+			x, alg, *bytes_s, *len_s, username_for_verifier, password, len_password))
 		goto error_and_exit;
 
 	srp_dbg_num(x, "Server calculated x: ");
@@ -643,15 +625,14 @@ SRP_Result srp_create_salted_verification_key( SRP_HashAlgorithm alg,
 
 	*len_v = mpz_num_bytes(v);
 
-	*bytes_v = (unsigned char*)srp_alloc(*len_v);
+	*bytes_v = (unsigned char *)srp_alloc(*len_v);
 
-	if (!bytes_v)
-		goto error_and_exit;
+	if (!*bytes_v) goto error_and_exit;
 
 	mpz_to_bin(v, *bytes_v);
 
 cleanup_and_exit:
-	delete_ng( ng );
+	delete_ng(ng);
 	mpz_clear(v);
 	mpz_clear(x);
 	return ret;
@@ -660,7 +641,7 @@ error_and_exit:
 	goto cleanup_and_exit;
 }
 
-
+// clang-format off
 
 /* Out: bytes_B, len_B.
  *
@@ -685,6 +666,7 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 	mpz_t tmp1; mpz_init(tmp1);
 	mpz_t tmp2; mpz_init(tmp2);
 	mpz_t tmp3; mpz_init(tmp3);
+	// clang-format on
 	size_t ulen = strlen(username) + 1;
 	NGConstant *ng = new_ng(ng_type, n_hex, g_hex);
 	struct SRPVerifier *ver = 0;
@@ -692,13 +674,11 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 	*len_B = 0;
 	*bytes_B = 0;
 
-	if (!ng)
-		goto cleanup_and_exit;
+	if (!ng) goto cleanup_and_exit;
 
-	ver = (struct SRPVerifier *) srp_alloc( sizeof(struct SRPVerifier) );
+	ver = (struct SRPVerifier *)srp_alloc(sizeof(struct SRPVerifier));
 
-	if (!ver)
-		goto cleanup_and_exit;
+	if (!ver) goto cleanup_and_exit;
 
 	if (init_random() != SRP_OK) { /* Only happens once */
 		srp_free(ver);
@@ -706,7 +686,7 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 		goto cleanup_and_exit;
 	}
 
-	ver->username = (char *) srp_alloc(ulen);
+	ver->username = (char *)srp_alloc(ulen);
 	ver->hash_alg = alg;
 	ver->ng = ng;
 
@@ -716,7 +696,7 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 		goto cleanup_and_exit;
 	}
 
-	memcpy((char*)ver->username, username, ulen);
+	memcpy((char *)ver->username, username, ulen);
 
 	ver->authenticated = 0;
 
@@ -726,29 +706,17 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 		if (bytes_b) {
 			mpz_from_bin(bytes_b, len_b, b);
 		} else {
-			if (mpz_fill_random(b) != SRP_OK) {
-				srp_free(ver);
-				ver = 0;
-				goto cleanup_and_exit;
-			}
+			if (!mpz_fill_random(b)) goto ver_cleanup_and_exit;
 		}
 
-		if (!H_nn(k, alg, ng->N, ng->N, ng->g)) {
-			srp_free(ver);
-			ver = 0;
-			goto cleanup_and_exit;
-		}
+		if (!H_nn(k, alg, ng->N, ng->N, ng->g)) goto ver_cleanup_and_exit;
 
 		/* B = kv + g^b */
 		mpz_mulm(tmp1, k, v, ng->N, tmp3);
 		mpz_powm(tmp2, ng->g, b, ng->N);
 		mpz_addm(B, tmp1, tmp2, ng->N, tmp3);
 
-		if (!H_nn(u, alg, ng->N, A, B)) {
-			srp_free(ver);
-			ver = 0;
-			goto cleanup_and_exit;
-		}
+		if (!H_nn(u, alg, ng->N, A, B)) goto ver_cleanup_and_exit;
 
 		srp_dbg_num(u, "Server calculated u: ");
 
@@ -757,20 +725,22 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 		mpz_mulm(tmp2, A, tmp1, ng->N, tmp3);
 		mpz_powm(S, tmp2, b, ng->N);
 
-		hash_num(alg, S, ver->session_key);
+		if (!hash_num(alg, S, ver->session_key)) goto ver_cleanup_and_exit;
 
-		calculate_M(alg, ng, ver->M, username, bytes_s, len_s, A, B, ver->session_key);
-		calculate_H_AMK(alg, ver->H_AMK, A, ver->M, ver->session_key);
+		if (!calculate_M(
+				alg, ng, ver->M, username, bytes_s, len_s, A, B, ver->session_key)) {
+			goto ver_cleanup_and_exit;
+		}
+		if (!calculate_H_AMK(alg, ver->H_AMK, A, ver->M, ver->session_key)) {
+			goto ver_cleanup_and_exit;
+		}
 
 		*len_B = mpz_num_bytes(B);
-		*bytes_B = (unsigned char*)srp_alloc(*len_B);
+		*bytes_B = (unsigned char *)srp_alloc(*len_B);
 
 		if (!*bytes_B) {
-			srp_free(ver->username);
-			srp_free(ver);
-			ver = 0;
 			*len_B = 0;
-			goto cleanup_and_exit;
+			goto ver_cleanup_and_exit;
 		}
 
 		mpz_to_bin(B, *bytes_B);
@@ -793,11 +763,13 @@ cleanup_and_exit:
 	mpz_clear(tmp2);
 	mpz_clear(tmp3);
 	return ver;
+ver_cleanup_and_exit:
+	srp_free(ver->username);
+	srp_free(ver);
+	ver = 0;
+	goto cleanup_and_exit;
 }
 
-
-
-
 void srp_verifier_delete(struct SRPVerifier *ver)
 {
 	if (ver) {
@@ -809,36 +781,31 @@ void srp_verifier_delete(struct SRPVerifier *ver)
 	}
 }
 
-
-
 int srp_verifier_is_authenticated(struct SRPVerifier *ver)
 {
 	return ver->authenticated;
 }
 
-
 const char *srp_verifier_get_username(struct SRPVerifier *ver)
 {
 	return ver->username;
 }
 
-
-const unsigned char *srp_verifier_get_session_key(struct SRPVerifier *ver, size_t *key_length)
+const unsigned char *srp_verifier_get_session_key(
+	struct SRPVerifier *ver, size_t *key_length)
 {
-	if (key_length)
-		*key_length = hash_length(ver->hash_alg);
+	if (key_length) *key_length = hash_length(ver->hash_alg);
 	return ver->session_key;
 }
 
-
 size_t srp_verifier_get_session_key_length(struct SRPVerifier *ver)
 {
 	return hash_length(ver->hash_alg);
 }
 
-
 /* user_M must be exactly SHA512_DIGEST_LENGTH bytes in size */
-void srp_verifier_verify_session(struct SRPVerifier *ver, const unsigned char *user_M, unsigned char **bytes_HAMK)
+void srp_verifier_verify_session(
+	struct SRPVerifier *ver, const unsigned char *user_M, unsigned char **bytes_HAMK)
 {
 	if (memcmp(ver->M, user_M, hash_length(ver->hash_alg)) == 0) {
 		ver->authenticated = 1;
@@ -851,15 +818,14 @@ void srp_verifier_verify_session(struct SRPVerifier *ver, const unsigned char *u
 
 struct SRPUser *srp_user_new(SRP_HashAlgorithm alg, SRP_NGType ng_type,
 	const char *username, const char *username_for_verifier,
-	const unsigned char *bytes_password, size_t len_password,
-	const char *n_hex, const char *g_hex)
+	const unsigned char *bytes_password, size_t len_password, const char *n_hex,
+	const char *g_hex)
 {
-	struct SRPUser *usr = (struct SRPUser *) srp_alloc(sizeof(struct SRPUser));
-	size_t ulen  = strlen(username) + 1;
+	struct SRPUser *usr = (struct SRPUser *)srp_alloc(sizeof(struct SRPUser));
+	size_t ulen = strlen(username) + 1;
 	size_t uvlen = strlen(username_for_verifier) + 1;
 
-	if (!usr)
-		goto err_exit;
+	if (!usr) goto err_exit;
 
 	if (init_random() != SRP_OK) /* Only happens once */
 		goto err_exit;
@@ -871,16 +837,14 @@ struct SRPUser *srp_user_new(SRP_HashAlgorithm alg, SRP_NGType ng_type,
 	mpz_init(usr->A);
 	mpz_init(usr->S);
 
-	if (!usr->ng)
-		goto err_exit;
+	if (!usr->ng) goto err_exit;
 
-	usr->username = (char*)srp_alloc(ulen);
-	usr->username_verifier = (char*)srp_alloc(uvlen);
-	usr->password = (unsigned char*)srp_alloc(len_password);
+	usr->username = (char *)srp_alloc(ulen);
+	usr->username_verifier = (char *)srp_alloc(uvlen);
+	usr->password = (unsigned char *)srp_alloc(len_password);
 	usr->password_len = len_password;
 
-	if (!usr->username || !usr->password || !usr->username_verifier)
-		goto err_exit;
+	if (!usr->username || !usr->password || !usr->username_verifier) goto err_exit;
 
 	memcpy(usr->username, username, ulen);
 	memcpy(usr->username_verifier, username_for_verifier, uvlen);
@@ -897,8 +861,7 @@ err_exit:
 		mpz_clear(usr->a);
 		mpz_clear(usr->A);
 		mpz_clear(usr->S);
-		if (usr->ng)
-			delete_ng(usr->ng);
+		if (usr->ng) delete_ng(usr->ng);
 		srp_free(usr->username);
 		srp_free(usr->username_verifier);
 		if (usr->password) {
@@ -911,11 +874,9 @@ err_exit:
 	return 0;
 }
 
-
-
 void srp_user_delete(struct SRPUser *usr)
 {
-	if(usr) {
+	if (usr) {
 		mpz_clear(usr->a);
 		mpz_clear(usr->A);
 		mpz_clear(usr->S);
@@ -928,67 +889,58 @@ void srp_user_delete(struct SRPUser *usr)
 		srp_free(usr->username_verifier);
 		srp_free(usr->password);
 
-		if (usr->bytes_A)
-			srp_free(usr->bytes_A);
+		if (usr->bytes_A) srp_free(usr->bytes_A);
 
 		memset(usr, 0, sizeof(*usr));
 		srp_free(usr);
 	}
 }
 
-
-
 int srp_user_is_authenticated(struct SRPUser *usr)
 {
 	return usr->authenticated;
 }
 
-
 const char *srp_user_get_username(struct SRPUser *usr)
 {
 	return usr->username;
 }
 
-
-const unsigned char* srp_user_get_session_key(struct SRPUser* usr, size_t* key_length)
+const unsigned char *srp_user_get_session_key(struct SRPUser *usr, size_t *key_length)
 {
-	if (key_length)
-		*key_length = hash_length(usr->hash_alg);
+	if (key_length) *key_length = hash_length(usr->hash_alg);
 	return usr->session_key;
 }
 
-
 size_t srp_user_get_session_key_length(struct SRPUser *usr)
 {
 	return hash_length(usr->hash_alg);
 }
 
-
+// clang-format off
 /* Output: username, bytes_A, len_A */
 SRP_Result srp_user_start_authentication(struct SRPUser *usr, char **username,
 	const unsigned char *bytes_a, size_t len_a,
 	unsigned char **bytes_A, size_t *len_A)
 {
+	// clang-format on
 	if (bytes_a) {
 		mpz_from_bin(bytes_a, len_a, usr->a);
 	} else {
-		if (mpz_fill_random(usr->a) != SRP_OK)
-			goto error_and_exit;
+		if (!mpz_fill_random(usr->a)) goto error_and_exit;
 	}
 
 	mpz_powm(usr->A, usr->ng->g, usr->a, usr->ng->N);
 
 	*len_A = mpz_num_bytes(usr->A);
-	*bytes_A = (unsigned char*)srp_alloc(*len_A);
+	*bytes_A = (unsigned char *)srp_alloc(*len_A);
 
-	if (!*bytes_A)
-		goto error_and_exit;
+	if (!*bytes_A) goto error_and_exit;
 
 	mpz_to_bin(usr->A, *bytes_A);
 
 	usr->bytes_A = *bytes_A;
-	if (username)
-		*username = usr->username;
+	if (username) *username = usr->username;
 
 	return SRP_OK;
 
@@ -999,7 +951,7 @@ error_and_exit:
 	return SRP_ERR;
 }
 
-
+// clang-format off
 /* Output: bytes_M. Buffer length is SHA512_DIGEST_LENGTH */
 void  srp_user_process_challenge(struct SRPUser *usr,
 	const unsigned char *bytes_s, size_t len_s,
@@ -1015,17 +967,17 @@ void  srp_user_process_challenge(struct SRPUser *usr,
 	mpz_t tmp2; mpz_init(tmp2);
 	mpz_t tmp3; mpz_init(tmp3);
 	mpz_t tmp4; mpz_init(tmp4);
+	// clang-format on
 
 	*len_M = 0;
 	*bytes_M = 0;
 
-	if (!H_nn(u, usr->hash_alg, usr->ng->N, usr->A, B))
-		goto cleanup_and_exit;
+	if (!H_nn(u, usr->hash_alg, usr->ng->N, usr->A, B)) goto cleanup_and_exit;
 
 	srp_dbg_num(u, "Client calculated u: ");
 
-	if (!calculate_x(x, usr->hash_alg, bytes_s, len_s,
-			usr->username_verifier, usr->password, usr->password_len))
+	if (!calculate_x(x, usr->hash_alg, bytes_s, len_s, usr->username_verifier,
+			usr->password, usr->password_len))
 		goto cleanup_and_exit;
 
 	srp_dbg_num(x, "Client calculated x: ");
@@ -1034,11 +986,12 @@ void  srp_user_process_challenge(struct SRPUser *usr,
 		goto cleanup_and_exit;
 
 	/* SRP-6a safety check */
-	if ( mpz_sgn(B) != 0 && mpz_sgn(u) != 0 ) {
+	if (mpz_sgn(B) != 0 && mpz_sgn(u) != 0) {
 		mpz_powm(v, usr->ng->g, x, usr->ng->N);
 
 		srp_dbg_num(v, "Client calculated v: ");
 
+		// clang-format off
 		/* S = (B - k*(g^x)) ^ (a + ux) */
 		mpz_mul(tmp1, u, x);
 		mpz_add(tmp2, usr->a, tmp1);               /* tmp2 = (a + ux)      */
@@ -1046,23 +999,24 @@ void  srp_user_process_challenge(struct SRPUser *usr,
 		mpz_mulm(tmp3, k, tmp1, usr->ng->N, tmp4); /* tmp3 = k*(g^x)       */
 		mpz_subm(tmp1, B, tmp3, usr->ng->N, tmp4); /* tmp1 = (B - K*(g^x)) */
 		mpz_powm(usr->S, tmp1, tmp2, usr->ng->N);
+		// clang-format on
 
-		hash_num(usr->hash_alg, usr->S, usr->session_key);
+		if (!hash_num(usr->hash_alg, usr->S, usr->session_key)) goto cleanup_and_exit;
 
-		calculate_M( usr->hash_alg, usr->ng, usr->M, usr->username, bytes_s, len_s, usr->A,B, usr->session_key );
-		calculate_H_AMK( usr->hash_alg, usr->H_AMK, usr->A, usr->M, usr->session_key );
+		if (!calculate_M(usr->hash_alg, usr->ng, usr->M, usr->username, bytes_s, len_s,
+				usr->A, B, usr->session_key))
+			goto cleanup_and_exit;
+		if (!calculate_H_AMK(usr->hash_alg, usr->H_AMK, usr->A, usr->M, usr->session_key))
+			goto cleanup_and_exit;
 
 		*bytes_M = usr->M;
-		if (len_M)
-			*len_M = hash_length( usr->hash_alg );
+		if (len_M) *len_M = hash_length(usr->hash_alg);
 	} else {
 		*bytes_M = NULL;
-		if (len_M)
-			*len_M   = 0;
+		if (len_M) *len_M = 0;
 	}
 
 cleanup_and_exit:
-
 	mpz_clear(B);
 	mpz_clear(u);
 	mpz_clear(x);
@@ -1074,7 +1028,6 @@ cleanup_and_exit:
 	mpz_clear(tmp4);
 }
 
-
 void srp_user_verify_session(struct SRPUser *usr, const unsigned char *bytes_HAMK)
 {
 	if (memcmp(usr->H_AMK, bytes_HAMK, hash_length(usr->hash_alg)) == 0)