doc: describe magic numbers

src/md5/md5.c

@@ -13,6 +13,11 @@ const uint32_t	g_md5_s[64] = {
 
 #undef S_ROUND
 
+/*
+ * import math
+ * for i in range(0, 64): 
+ *     hex(math.floor(math.pow(2, 32) * abs(math.sin(i+1))))
+*/
 const uint32_t	g_md5_T[64] = {
 	0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
 	0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,

src/sha256/sha256.c

@@ -1,5 +1,12 @@
 #include "sha256.h"
 
+/*
+ * for i in range(0, 64):
+ *     p = nth_prime(i + 1)
+ *     value = math.floor((2**32) * ((p ** (1/3)) % 1))
+ *     print(hex(int(value)))
+*/
+
 const uint32_t	g_sha256_K[64] = {
 	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
 	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,

src/sha256/sha256_init.c

@@ -1,5 +1,11 @@
 #include "sha256.h"
 
+/*
+ * for i in range(0,8):
+ *     p = nth_prime(i + 1)
+ *     frac = math.sqrt(p) % 1
+ *     print(hex(int(frac * 2**32)))
+ */
 void	sha256_init(void *ctx)
 {
 	struct sha256_ctx	*local_ctx = ctx;